fpc/docs/unix.xml

<?xml version="1.0" encoding="ISO8859-1"?>
<fpdoc-descriptions>
<package name="rtl">

<!--
  ====================================================================
    Unix
  ====================================================================
-->

<module name="Unix">
<short>Extended Unix functionality.</short>
<descr>
</descr>

<!-- unresolved type reference Visibility: default -->
<element name="UnixUtil">
<short>Various unit utility routines.</short>
</element>

<!-- unresolved type reference Visibility: default -->
<element name="BaseUnix">
<short>Basic unix functionality.</short>
</element>

<!-- unresolved type reference Visibility: default -->
<element name="UnixType">
<short>Basic unix types.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cInt8">
<short>C type: 8 bits sized, signed integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cUInt8">
<short>C type: 8 bits sized, unsigned integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cUInt16">
<short>C type: 16 bits sized, unsigned integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cInt16">
<short>C type: 16 bits sized, signed integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cInt32">
<short>C type: 32 bits sized, signed integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cUInt32">
<short>C type: 32 bits sized, unsigned integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cInt64">
<short>C type: 64 bits sized, signed integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cUInt64">
<short>C type: 64 bits sized, unsigned integer.</short>
</element>

<!-- alias type Visibility: default -->
<element name="cuchar">
<short>C type: unsigned character</short>
</element>

<!-- alias type Visibility: default -->
<element name="cInt">
<short>C type: integer (natural size)</short>
</element>

<!-- alias type Visibility: default -->
<element name="cUInt">
<short>C type: unsigned integer (natural size)</short>
</element>

<!-- alias type Visibility: default -->
<element name="cLong">
<short>C type: long signed integer (double sized)</short>
</element>

<!-- alias type Visibility: default -->
<element name="cuLong">
<short>C type: long unsigned integer (double sized)</short>
</element>

<!-- alias type Visibility: default -->
<element name="cshort">
<short>C type: short signed integer (half sized)</short>
</element>

<!-- alias type Visibility: default -->
<element name="cushort">
<short>C type: short unsigned integer (half sized)</short>
</element>

<!-- alias type Visibility: default -->
<element name="pcInt">
<short>Pointer to <link id="cInt"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pcUInt">
<short>Pointer to <link id="cUInt"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pcLong">
<short>Pointer to <link id="cLong"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pculong">
<short>Pointer to <link id="cuLong"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pcshort">
<short>Pointer to <link id="cShort"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pcushort">
<short>Pointer to <link id="cuShort"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="dev_t">
<short>Device descriptor type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TDev">
<short>Alias for <link id="dev_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pDev">
<short>Pointer to <link id="TDev"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="gid_t">
<short>Group ID type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TGid">
<short>Alias for <link id="gid_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pGid">
<short>Pointer to <link id="TGid"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="ino_t">
<short>Inode type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TIno">
<short>Alias for <link id="ino_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pIno">
<short>Pointer to <link id="TIno"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="mode_t">
<short>Inode mode type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TMode">
<short>Alias for <link id="mode_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pMode">
<short>Pointer to <link id="TMode"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="nlink_t">
<short>Number of links type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TnLink">
<short>Alias for <link id="nlink_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pnLink">
<short>Pointer to <link id="TnLink"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="off_t">
<short>Offset type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TOff">
<short>Alias for <link id="off_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pOff">
<short>Pointer to <link id="TOff"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pid_t">
<short>Process ID type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TPid">
<short>Alias for <link id="pid_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pPid">
<short>Pointer to <link id="TPid"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="size_t">
<short>Size specification type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TSize">
<short>Alias for <link id="size_t"/> type</short>
</element>

<!-- alias type Visibility: default -->
<element name="pSize">
<short>Pointer to <link id="TSize"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="ssize_t">
<short>Small size type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TsSize">
<short>Alias for <link id="ssize_t"/> type</short>
</element>

<!-- alias type Visibility: default -->
<element name="psSize">
<short>Pointer to <link id="TsSize"/> type</short>
</element>

<!-- alias type Visibility: default -->
<element name="uid_t">
<short>User ID type</short>
</element>

<!-- alias type Visibility: default -->
<element name="TUid">
<short>Alias for <link id="uid_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pUid">
<short>Pointer to <link id="TUid"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="clock_t">
<short>Clock ticks type</short>
</element>

<!-- alias type Visibility: default -->
<element name="TClock">
<short>Alias for <link id="clock_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pClock">
<short>Pointer to <link id="TClock"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="time_t">
<short>Time span type</short>
</element>

<!-- alias type Visibility: default -->
<element name="TTime">
<short>Alias for <link id="TTime"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pTime">
<short>Pointer to <link id="TTime"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="ptime_t">
<short>Pointer to <link id="time_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="socklen_t">
<short>Socket address length type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TSocklen">
<short>Alias for <link id="socklen_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pSocklen">
<short>Pointer to <link id="TSockLen"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="timeval">
<short>Time specification type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="ptimeval">
<short>Pointer to <link id="timeval"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TTimeVal">
<short>Alias for <link id="timeval"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="timespec">
<short>Short time specification type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="ptimespec">
<short>Pointer to <link id="timespec"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="Ttimespec">
<short>Alias for <link id="TimeSpec"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pthread_mutex_t">
<short>Thread mutex type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pthread_cond_t">
<short>Thread conditional variable type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="pthread_t">
<short>Posix thread type.</short>
</element>

<!-- constant Visibility: default -->
<element name="ARG_MAX">
<short>Maximum number of arguments to a program.</short>
</element>

<!-- constant Visibility: default -->
<element name="NAME_MAX">
<short>Maximum filename length.</short>
</element>

<!-- constant Visibility: default -->
<element name="PATH_MAX">
<short>Maximum pathname length.</short>
</element>

<!-- constant Visibility: default -->
<element name="SYS_NMLN">
<short>Max system name length.</short>
</element>

<!-- constant Visibility: default -->
<element name="SIG_MAXSIG">
<short>Maximum system signal number.</short>
</element>


<!-- constant Visibility: default -->
<element name="Prio_Process">
<short><link id="fpGetPriority"/> option: Get process priority.</short>
</element>

<!-- constant Visibility: default -->
<element name="Prio_PGrp">
<short><link id="fpGetPriority"/> option: Get process group priority.</short>
</element>

<!-- constant Visibility: default -->
<element name="Prio_User">
<short><link id="fpGetPriority"/> option: Get user priority.</short>
</element>

<!-- constant Visibility: default -->
<element name="Seek_set">
<short>Seek option: Set absolute position.</short>
</element>

<!-- constant Visibility: default -->
<element name="Seek_Cur">
<short>Seek option: Set position relative to current position.</short>
</element>

<!-- constant Visibility: default -->
<element name="Seek_End">
<short>Seek option: Set position relative to end of file.</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Accmode">
<short>Bitmask to determine access mode in open flags.</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_RdOnly">
<short>File open mode: Read only</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_WrOnly">
<short>File open mode: Write only</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_RdWr">
<short>File open mode: Read/Write</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Creat">
<short>File open mode: Create if file does not yet exist.</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Excl">
<short>File open mode: Open exclusively</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_NoCtty">
<short>File open mode: No TTY control.</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Trunc">
<short>File open mode: Truncate file to length 0</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Append">
<short>File open mode: Append to file</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_NonBlock">
<short>File open mode: Open in non-blocking mode</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_NDelay">
<short>File open mode: Alias for <link id="Open_NonBlock"/></short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Sync">
<short>File open mode: Write to disc at once</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Direct">
<short>File open mode: Minimize caching effects</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_LargeFile">
<short>File open mode: Open for 64-bit I/O</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_Directory">
<short>File open mode: File must be directory.</short>
</element>

<!-- constant Visibility: default -->
<element name="Open_NoFollow">
<short>File open mode: Fail if file is symbolic link.</short>
</element>

<!-- constant Visibility: default -->
<element name="Wait_NoHang">
<short><link id="#rtl.baseunix.fpWaitPID"/>: Do not wait</short>
</element>

<!-- constant Visibility: default -->
<element name="Wait_UnTraced">
<short><link id="#rtl.baseunix.fpWaitPID"/>: Also report stopped but untraced processes</short>
</element>

<!-- constant Visibility: default -->
<element name="Wait_Any">
<short><link id="#rtl.baseunix.fpWaitPID"/>: Wait on any process</short>
</element>

<!-- constant Visibility: default -->
<element name="Wait_MyPGRP">
<short><link id="#rtl.baseunix.fpWaitPID"/>: Wait processes from current process group</short>
</element>

<!-- constant Visibility: default -->
<element name="Wait_Clone">
<short><link id="#rtl.baseunix.fpWaitPID"/>: Wait on clone processes only.</short>
</element>


<element name="STAT_IFMT">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: File type bit mask</short>
</element>
<element name="STAT_IFSOCK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Socket</short>
</element>
<element name="STAT_IFLNK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Link</short>
</element>
<element name="STAT_IFREG">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Regular file</short>
</element>
<element name="STAT_IFBLK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Block device</short>
</element>
<element name="STAT_IFDIR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Directory</short>
</element>
<element name="STAT_IFCHR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Character device</short>
</element>
<element name="STAT_IFIFO">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: FIFO</short>
</element>
<element name="STAT_ISUID">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: UID bit set</short>
</element>
<element name="STAT_ISGID">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: GID bit set</short>
</element>
<element name="STAT_ISVTX">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Sticky bit set</short>
</element>
<element name="STAT_IRWXO">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Other permission bits mask</short>
</element>
<element name="STAT_IROTH">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Other read permission</short>
</element>
<element name="STAT_IWOTH">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Other write permission</short>
</element>
<element name="STAT_IXOTH">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Others execute permission</short>
</element>
<element name="STAT_IRWXG">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Group permission bits mask</short>
</element>
<element name="STAT_IRGRP">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Group read permission</short>
</element>
<element name="STAT_IWGRP">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Group write permission</short>
</element>
<element name="STAT_IXGRP">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Others execute permission</short>
</element>
<element name="STAT_IRWXU">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Owner permission bits mask</short>
</element>
<element name="STAT_IRUSR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Owner read permission</short>
</element>
<element name="STAT_IWUSR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Owner write permission</short>
</element>
<element name="STAT_IXUSR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Others execute permission</short>
</element>

<element name="fs_old_ext2">
<short>File system type (<link id="StatFS"/>): (ext2) Old second extended</short>
</element>
<element name="fs_ext2">
<short>File system type (<link id="StatFS"/>): (ext2) Second extended</short>
</element>
<element name="fs_ext">
<short>File system type (<link id="StatFS"/>): (ext) Extended</short>
</element>
<element name="fs_iso">
<short>File system type (<link id="StatFS"/>): ISO 9660</short>
</element>
<element name="fs_minix">
<short>File system type (<link id="StatFS"/>): Minix</short>
</element>
<element name="fs_minix_30">
<short>File system type (<link id="StatFS"/>): Minix 3.0</short>
</element>
<element name="fs_minux_V2">
<short>File system type (<link id="StatFS"/>): Minix V2</short>
</element>
<element name="fs_msdos">
<short>File system type (<link id="StatFS"/>): MSDOS (FAT)</short>
</element>
<element name="fs_nfs">
<short>File system type (<link id="StatFS"/>): NFS </short>
</element>
<element name="fs_proc">
<short>File system type (<link id="StatFS"/>): PROC fs</short>
</element>
<element name="fs_xia">
<short>File system type (<link id="StatFS"/>): XIA</short>
</element>

<element name="MAP_PRIVATE">
<short><link id="FpMMap"/> map type: Changes are private</short>
</element>
<element name="MAP_ANONYMOUS">
<short><link id="FpMMap"/> map type: Don't use a file</short>
</element>
<element name="MAP_GROWSDOWN">
<short><link id="FpMMap"/> option: Memory grows downward (like a stack)</short>
</element>
<element name="MAP_DENYWRITE">
<short><link id="FpMMap"/> option: Ignored.</short>
</element>
<element name="MAP_EXECUTABLE">
<short><link id="FpMMap"/> option: Ignored.</short>
</element>
<element name="MAP_LOCKED">
<short><link id="FpMMap"/> option: lock the pages in memory.</short>
</element>
<element name="MAP_NORESERVE">
<short><link id="FpMMap"/> option: Do not reserve swap pages for this memory.</short>
</element>
<element name="MAP_SHARED">
<short><link id="FpMMap"/> map type: Share changes</short>
</element>
<element name="MAP_TYPE">
<short><link id="FpMMap"/> map type: Bitmask for type of mapping</short>
</element>
<element name="MAP_FIXED">
<short><link id="FpMMap"/> map type: Interpret addr exactly</short>
</element>


<!-- constant Visibility: default -->
<element name="IOCtl_TCGETS">
<short>IOCTL call number: get Terminal Control settings</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_NOCLDSTOP">
<short>Sigaction options: Do not receive notification when child processes stop</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_NOCLDWAIT">
<short>Sigaction options: ?</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_SIGINFO">
<short>Sigaction options: The signal handler takes 3 arguments, not one.</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_SHIRQ">
<short>Sigaction options: ?</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_STACK">
<short>Sigaction options: Call the signal handler on an alternate signal stack.</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_RESTART">
<short>Sigaction options: Provide behaviour compatible with BSD signal semantics</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_INTERRUPT">
<short>Sigaction options: ?</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_NOMASK">
<short>Sigaction options: Do not prevent the signal from being received when it is handled.</short>
</element>

<!-- constant Visibility: default -->
<element name="SA_ONESHOT">
<short>Sigaction options: Restore the signal action to the default state.</short>
</element>

<element name="SIG_BLOCK">
<short>Sigprocmask flags: Add signals to the set of blocked signals.</short>
</element>
<element name="SIG_UNBLOCK">
<short>Sigprocmask flags: Remove signals from the set set of blocked signals.</short>
</element>
<element name="SIG_SETMASK">
<short>Sigprocmask flags: Set of blocked signals is given.</short>
</element>
<element name="SIG_DFL">
<short>Signal handler: Default signal handler</short>
</element>
<element name="SIG_IGN">
<short>Signal handler: Ignore signal</short>
</element>
<element name="SIG_ERR">
<short>Signal handler: error</short>
</element>

<element name="SIGHUP">
<short>Signal: HUP (Hangup)</short>
</element>
<element name="SIGINT">
<short>Signal: INT (Interrupt)</short>
</element>
<element name="SIGQUIT">
<short>Signal: QUIT</short>
</element>
<element name="SIGILL">
<short>Signal: ILL (Illegal instruction)</short>
</element>
<element name="SIGTRAP">
<short>Signal: TRAP (Trace trap)</short>
</element>
<element name="SIGABRT">
<short>Signal: ABRT (Abort)</short>
</element>
<element name="SIGIOT">
<short>Signal: IOT (IOT trap)</short>
</element>
<element name="SIGBUS">
<short>Signal: BUS (bus error)</short>
</element>
<element name="SIGFPE">
<short>Signal: FPE (Floating point error)</short>
</element>
<element name="SIGKILL">
<short>Signal: KILL (unblockable)</short>
</element>
<element name="SIGUSR1">
<short>Signal: USR1 (User-defined signal 1)</short>
</element>
<element name="SIGSEGV">
<short>Signal: SEGV (Segmentation violation)</short>
</element>
<element name="SIGUSR2">
<short>Signal: USR2 (User-defined signal 2)</short>
</element>
<element name="SIGPIPE">
<short>Signal: PIPE (Broken pipe</short>
</element>
<element name="SIGALRM">
<short>Signal: ALRM (Alarm clock)</short>
</element>
<element name="SIGTERM">
<short>Signal: TERM (Terminate)</short>
</element>
<element name="SIGSTKFLT">
<short>Signal: STKFLT (Stack Fault)</short>
</element>
<element name="SIGCHLD">
<short>Signal: CHLD (child status changed)</short>
</element>
<element name="SIGCONT">
<short>Signal: CONT (Continue)</short>
</element>
<element name="SIGSTOP">
<short>Signal: STOP (Stop, unblockable)</short>
</element>
<element name="SIGTSTP">
<short>Signal: TSTP (keyboard stop)</short>
</element>

<element name="SIGTTIN">
<short>Signal: TTIN (Terminal input, background)</short>
</element>
<element name="SIGTTOU">
<short>Signal: TTOU (Terminal output, background)</short>
</element>
<element name="SIGURG">
<short>Signal: URG (Socket urgent condition)</short>
</element>
<element name="SIGXCPU">
<short>Signal: XCPU (CPU limit exceeded)</short>
</element>
<element name="SIGXFSZ">
<short>Signal: XFSZ (File size limit exceeded)</short>
</element>
<element name="SIGVTALRM">
<short>Signal: VTALRM (Virtual alarm clock)</short>
</element>
<element name="SIGPROF">
<short>Signal: PROF (Profiling alarm)</short>
</element>
<element name="SIGWINCH">
<short>Signal: WINCH (Window/Terminal size change)</short>
</element>
<element name="SIGIO">
<short>Signal: IO (I/O operation possible)</short>
</element>
<element name="SIGPOLL">
<short>Signal: POLL (Pollable event) </short>
</element>
<element name="SIGPWR">
<short>Signal: PWR (power failure restart)</short>
</element>
<element name="SIGUNUSED">
<short>Signal: Unused</short>
</element>

<!-- constant Visibility: default -->
<element name="SI_PAD_SIZE">
<short>Signal information pad size.</short>
</element>

<element name="tfpreg">
<short>Record describing floating point register in signal handler.</short>
</element>
<element name="tfpreg.significand">
<short>Decimal part of floating point value</short>
</element>
<element name="tfpreg.exponent">
<short>Exponent of floating point value</short>
</element>

<element name="pfpstate">
<short>Pointer to <link id="tfpstate"/> record.</short>
</element>
<element name="tfpstate">
<short>Record describing floating point unit in signal handler.</short>
</element>
<element name="tfpstate.cw">
<short></short>
</element>
<element name="tfpstate.sw">
<short></short>
</element>
<element name="tfpstate.tag">
<short></short>
</element>
<element name="tfpstate.ipoff">
<short></short>
</element>
<element name="tfpstate.cssel">
<short></short>
</element>
<element name="tfpstate.dataoff">
<short></short>
</element>
<element name="tfpstate.datasel">
<short></short>
</element>
<element name="tfpstate.st">
<short></short>
</element>
<element name="tfpstate.status">
<short></short>
</element>


<element name="SigSet">
<short>Signal set type</short>
</element>

<!-- alias type Visibility: default -->
<element name="sigset_t">
<short>Signal set type</short>
</element>

<!-- pointer type Visibility: default -->
<element name="PSigSet">
<short>Pointer to <link id="SigSet"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="psigset_t">
<short>Pointer to <link id="sigset_t"/> type.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TSigSet">
<short>Alias for <link id="SigSet"/> type.</short>
</element>

<!-- pointer type Visibility: default -->
<element name="PSigInfoRec">
<short>Pointer to <link id="SigInfoRec"/> record type.</short>
</element>

<!-- record type Visibility: default -->
<element name="SigInfoRec">
<short>Record containing signal information.</short>
</element>

<!-- variable Visibility: default -->
<element name="SigInfoRec.si_signo">
<short>Signal number.</short>
</element>

<!-- variable Visibility: default -->
<element name="SigInfoRec.si_errno">
<short>?</short>
</element>

<!-- variable Visibility: default -->
<element name="SigInfoRec.si_code">
<short>?</short>
</element>

<!-- procedure type Visibility: default -->
<element name="SignalHandler">
<short>Simple signal handler prototype</short>
</element>

<!-- pointer type Visibility: default -->
<element name="PSignalHandler">
<short>Pointer to <link id="SignalHandler"/> type.</short>
</element>

<element name="SignalRestorer">
<short>Signal restorer function prototype</short>
</element>
<element name="PSignalrestorer">
<short>Pointer to <link id="SignalRestorer"/> type</short>
</element>

<!-- procedure type Visibility: default -->
<element name="TSigAction">
<short>Extended signal handler prototype.</short>
</element>

<!-- record type Visibility: default -->
<element name="SigActionRec">
<short>Record used in <link id="#rtl.baseunix.fpSigAction"/> call.</short>
</element>
<element name="SigActionRec.sa_handler">
<short>Funcion called when signal is triggered.</short>
</element>
<element name="SigActionRec.Sa_Mask">
<short>Signal mask.</short>
</element>
<element name="SigActionRec.SA_FLAGS">
<short>Flags for SigAction</short>
</element>
<element name="SigActionRec.SA_RESTORER">
<short>Obsolete, don't use</short>
</element>

<!-- alias type Visibility: default -->
<element name="TSigActionRec">
<short>Alias for <link id="SigActionRec"/> record type.</short>
</element>

<!-- pointer type Visibility: default -->
<element name="PSigActionRec">
<short>Pointer to <link id="SigActionRec"/> record type.</short>
</element>

<!-- record type Visibility: default -->
<element name="timezone">
<short>Record describing a timezone</short>
</element>

<!-- variable Visibility: default -->
<element name="timezone.minuteswest">
<short>Minutes west of GMT</short>
</element>

<!-- variable Visibility: default -->
<element name="timezone.dsttime">
<short>Daylight savings time</short>
</element>

<!-- pointer type Visibility: default -->
<element name="ptimezone">
<short>Pointer to <link id="TimeZone"/> record.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TTimeZone">
<short>Alias for <link id="TimeZone"/> record.</short>
</element>

<element name="S_IFMT">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: File type bit mask</short>
</element>
<element name="S_IFSOCK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Socket</short>
</element>
<element name="S_IFLNK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Link</short>
</element>
<element name="S_IFREG">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Regular file</short>
</element>
<element name="S_IFBLK">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Block device</short>
</element>
<element name="S_IFDIR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Directory</short>
</element>
<element name="S_IFCHR">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: Character device</short>
</element>
<element name="S_IFIFO">
<short>File (<link id="#rtl.baseunix.stat"/> record) mode: FIFO</short>
</element>

<!-- constant Visibility: default -->
<element name="P_IN">
<short>Input file descriptor of pipe pair.</short>
</element>

<!-- constant Visibility: default -->
<element name="P_OUT">
<short>Output file descriptor of pipe pair.</short>
</element>


<element name="LOCK_SH">
<short><link id="FpFLock"/> Shared lock</short>
</element>
<element name="LOCK_EX">
<short><link id="FpFLock"/> Exclusive lock</short>
</element>
<element name="LOCK_UN">
<short><link id="FpFLock"/> unlock</short>
</element>
<element name="LOCK_NB">
<short><link id="FpFLock"/> Non-blocking operation</short>
</element>

<element name="PGlob">
<short>Pointer to <link id="TGlob"/> record.</short>
</element>
<element name="TGlob">
<short>Record containing one entry in the result of <link id="Glob"/></short>
</element>
<element name="TGlob.Name">
<short>Filename matching the search criteria</short>
</element>
<element name="TGlob.Next">
<short>Next element in result of <var>Glob</var> call.</short>
</element>

<element name="Tpipe">
<short>Array describing a pipe pair of filedescriptors.</short>
</element>

<!-- variable Visibility: default -->
<element name="tzdaylight">
<short>Indicates whether daylight savings time is active.</short>
</element>

<!-- variable Visibility: default -->
<element name="tzname">
<short>Timezone name.</short>
</element>

<element name="PROT_READ">
<short><link id="FpMMap"/> memory access: page can be read</short>
</element>
<element name="PROT_WRITE">
<short><link id="FpMMap"/> memory access: page can be written</short>
</element>
<element name="PROT_EXEC">
<short><link id="FpMMap"/> memory access: page can be executed</short>
</element>
<element name="PROT_NONE">
<short><link id="FpMMap"/> memory access: page can not be accessed</short>
</element>


<!-- enumeration type Visibility: default -->
<element name="TFSearchOption">
<short>Describes the search strategy used by <link id="FSearch"/></short>
<seealso>
<link id="FSearch"/>
</seealso>
</element>

<!-- enumeration value Visibility: default -->
<element name="TFSearchOption.NoCurrentDirectory">
<short>Do not search the current directory unless it is specified in the search path.</short>
</element>

<!-- enumeration value Visibility: default -->
<element name="TFSearchOption.CurrentDirectoryFirst">
<short>Search the current directory first, before all directories in the search path.</short>
</element>

<!-- enumeration value Visibility: default -->
<element name="TFSearchOption.CurrentDirectoryLast">
<short>Search the current directory last, after all directories in the search path </short>
</element>

<!-- procedure Visibility: default -->
<element name="GetLocalTimezone">
<short>Return local timzeone information</short>
<descr>
<p>
<var>GetLocalTimeZone</var> returns the local timezone information. It also
initializes the <var>TZSeconds</var> variable, which is used to correct the epoch time
to local time.
</p>
<p>
There should never be any need to call this function directly. It is called by the
initialization routines of the Linux unit.
</p>
</descr>
<seealso>
<link id="GetTimezoneFile"/>
<link id="ReadTimezoneFile"/>
</seealso>
</element>

<!-- procedure Visibility: default -->
<element name="ReadTimezoneFile">
<short>Read the timezone file and initialize time routines</short>
<descr>
<p>
<var>ReadTimeZoneFile</var> reads the timezone file <var>fn</var> and initializes
the local time routines based on the information found there.
</p>
<p>
There should be no need to call this function. The initialization routines
of the <file>linux</file> unit call this routine at unit startup.
</p>
</descr>
<errors> 
None.
</errors>
<seealso>
<link id="GetTimezoneFile"/>
<link id="GetLocalTimezone"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="GetTimezoneFile">
<short>Return name of timezone information file</short>
<descr>
<p>
<var>GetTimezoneFile</var> returns the location of the current timezone file.
The location of file is determined as follows:
</p>
<ol>
<li>If <file>/etc/timezone</file> exists, it is read, and the contents of this
file is returned. This should work on Debian systems.</li>
<li>If <file>/usr/lib/zoneinfo/localtime</file> exists, then it is returned.
(this file is a symlink to the timezone file on SuSE systems)</li>
<li>If <file>/etc/localtime</file> exists, then it is returned. 
(this file is a symlink to the timezone file on RedHat systems)</li>
</ol>
</descr>
<errors>
If no file was found, an empty string is returned.
</errors>
<seealso>
<link id="ReadTimezoneFile"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="GetEpochTime">
<short>Return the current unix time</short>
<descr>
<p>
returns the number of seconds since 00:00:00 gmt, january 1, 1970.
it is adjusted to the local time zone, but not to DST.
</p>
</descr>
<errors>
no errors
</errors>
<seealso>
<link id="GetTime"/>
</seealso>
<example file="unixex/ex1"/>
</element>

<!-- procedure Visibility: default -->
<element name="GetTime">
<short>Return current system time</short>
<descr>
<p>
Returns the current time of the day, adjusted to local time.
Upon return, the parameters are filled with
</p>
<dl>
<dt>hour</dt><dd> Hours since 00:00 today.</dd>
<dt>min</dt><dd> minutes in current hour.</dd>
<dt>sec</dt><dd> seconds in current minute.</dd>
<dt>sec100</dt><dd> hundreds of seconds in current second.</dd>
<dt>msec</dt><dd> milliseconds in current second.</dd>
<dt>usec</dt><dd> microseconds in current second.</dd>
</dl>
</descr>
<errors>
None
</errors>
<seealso>
<link id="GetEpochTime"/>
<link id="GetDate"/>
<link id="GetDateTime"/>
</seealso>
<example file="unixex/ex5"/>
</element>

<!-- procedure Visibility: default -->
<element name="GetDate">
<short>Return the system date</short>
<descr>
<p>
Returns the current date. On return, the parameters are filled with
</p>
<dl>
<dt>year</dt><dd> Year (4 digits).</dd>
<dt>month</dt><dd> Month of the year.</dd>
<dt>day</dt><dd> Day of the month.</dd>
</dl>
</descr>
<errors>
None
</errors>
<seealso>
<link id="GetEpochTime"/>
<link id="GetTime"/>
<link id="GetDateTime"/>
<link id="SetTime"/>
</seealso>
<example file="unixex/ex6"/>
</element>

<!-- procedure Visibility: default -->
<element name="GetDateTime">
<short>Return system date and time</short>
<descr>
Returns the current date and time. The time is corrected for the local time
zone. This procedure is equivalent to the <link id="GetDate"/> and <var>GetTime</var>
calls.
</descr>
<errors>
None
</errors>
<seealso>
<link id="GetEpochTime"/>
<link id="GetTime"/>
<link id="GetDate"/> 
<link id="SetDate"/>
<link id="SetTime"/>
</seealso>
<example file="unixex/ex60"/>
</element>

<!-- function Visibility: default -->
<element name="SetTime">
<short>Set the current system time.</short>
<descr>
<p>
<var>SetTime</var> sets the system time to <var>hour</var>, <var>min</var>,
<var>Sec</var>. This is the kernel time, so it is in GMT. The date is not
touched. The function returns <var>True</var> if the call was executed corretly, 
<var>False</var> otherwise.
</p>
<remark>
You must be root to execute this call.
</remark>
</descr>
<errors>
Extended error information can be retrieved with <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
</errors>
<seealso>
<link id="GetTime"/>
<link id="SetDate"/>
<link id="GetDate"/>
<link id="SetDateTime"/>
<link id="GetDateTime"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="SetDate">
<short>Set the current system date.</short>
<descr>
<p>
<var>SetDate</var> sets the system date to <var>year</var>, <var>month</var>,
<var>day</var>. This is the kernel date, so it is in GMT. The time is not
touched. The function returns <var>True</var> if the call was executed 
corretly, <var>False</var> otherwise.
</p>
<remark>
You must be root to execute this call.
</remark>
</descr>
<errors>
Extended error information can be retrieved with <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
</errors>
<seealso>
<link id="GetDate"/>
<link id="SetTime"/>
<link id="GetTime"/>
<link id="SetDateTime"/>
<link id="GetDateTime"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="SetDateTime">
<short>Set the current system date and time</short>
<descr>
<p>
<var>SetDate</var> sets the system date and time to <var>year</var>,
<var>month</var>, <var>day</var>, <var>hour</var>, <var>min</var>, <var>Sec</var>.
This is the kernel date/time, so it is in GMT. The time is not
touched. The function returns <var>True</var> if the call was executed
corretly, <var>False</var> otherwise.
</p>
<remark>
You must be root to execute this call.
</remark>
</descr>
<errors>
Extended error information can be retrieved with <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
</errors>
<seealso>
<link id="SetDate"/>
<link id="SetTime"/>
<link id="GetDate"/>
<link id="GetTime"/>
<link id="GetDateTime"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="CreateShellArgV">
<short>Create an array of null-terminated strings</short>
<descr>
<p>
<var>CreateShellArgV</var> creates an array of 3 <var>PChar</var> pointers that can
be used as arguments to <var>ExecVE</var> the first elements in the array 
will contain  <var>/bin/sh</var>, the second will contain <var>-c</var>, and the third
will contain <var>prog</var>.
</p>
<p>
The function returns a pointer to this array, of type <var>PPChar</var>.
</p>
<p>
The memory allocated for the array can be disposed of with the <link id="FreeShellArgV"/> function.
</p>
</descr>
<errors>
None.
</errors>
<seealso>
<link id="Shell"/>
<link id="FreeShellArgV"/>
</seealso>
<example file="unixex/ex61"/>
</element>

<!-- procedure Visibility: default -->
<element name="FreeShellArgV">
<short>Frees the memory allocated by the <link id="CreateShellArgV"/> call.</short>
<descr>
<p>
<var>FreeShellArgV</var> frees the memory which was allocated by the
<link id="CreateShellArgV"/> call.
</p>
<p>
Do not attempt to free memory with this call which was allocated by some C
or other library, this will lead to memory corruption.
</p>
</descr>
<errors>
None.
</errors>
<seealso>
<link id="CreateShellArgV"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="Execv">
<short>Execute process</short>
<descr>
<var>Execv</var> replaces the currently running program with the program, specified in
<var>path</var>.
It gives the program the options in <var>args</var>.
This is a pointer to an array of pointers to null-terminated
strings. The last pointer in this array should be nil.
The current environment is passed to the program.
On success, <var>execv</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="Execvp"/>
<link id="Execle"/>
<link id="Execl"/>
<link id="Execlp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex8"/>
</element>

<!-- function Visibility: default -->
<element name="Execvp">
<short>Execute process, search path</short>
<descr>
<p>
<var>Execvp</var> replaces the currently running program with the program, specified in
<var>path</var>. The executable in <var>path</var> is searched in the
contents of the <var>PATH</var> environment variable, if it isn't 
an absolute filename. 
</p>
<p>
It gives the program the options in <var>args</var>. 
This is a pointer to an array of pointers to null-terminated
strings. The last pointer in this array should be nil.
The current environment is passed to the program.
On success, <var>execvp</var> does not return.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="Execv"/>
<link id="Execle"/>
<link id="Execl"/>
<link id="Execlp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex9"/>
</element>

<element name="Execl">
<short>Execute process (using argument list)</short>
<descr>
<var>Execl</var> replaces the currently running program with the program, specified in
<var>Todo</var>. <var>Todo</var> is split into a command and it's options.
The executable in <var>Todo</var> is NOT searched in the path.
The current environment is passed to the program.
On success, <var>execl</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt>
<dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt>
<dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt>
<dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt>
<dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="Execv"/>
<link id="Execvp"/>
<link id="Execle"/>
<link id="Execlp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex10"/>
</element>

<!-- function Visibility: default -->
<element name="Execle">
<short>Execute process (using argument list, environment)</short>
<descr>
<p>
<var>Execle</var> replaces the currently running program with the program, specified in
<var>Todo</var>. <var>Todo</var> is split into a command and it's options.
The executable in <var>Todo</var> is searched in the path, if it isn't
an absolute filename.
The environment in <var>ep</var> is passed to the program.
On success, <var>execle</var> does not return.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt>
<dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt>
<dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="Execv"/>
<link id="Execvp"/>
<link id="Execl"/>
<link id="Execlp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex11"/>
</element>

<!-- function Visibility: default -->
<element name="Execlp">
<short>Execute process (using argument list, environment; search path)</short>
<descr>
<var>Execlp</var> replaces the currently running program with the program, specified in
<var>path</var>. Path is split into a command and it's options.
The executable in <var>path</var> is searched in the path, if it isn't
an absolute filename.
The current environment is passed to the program.
On success, <var>execlp</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="Execv"/>
<link id="Execvp"/>
<link id="Execle"/>
<link id="Execl"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex12"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecLE">
<short>Execute process (using argument list, environment)</short>
<descr>
<p>
<var>FpExecLE</var> replaces the currently running program with the program, specified in
<var>PathName</var>. <var>S</var> is an array of command options.
The executable in <var>PathName</var> must be an absolute pathname.
The environment in <var>MyEnv</var> is passed to the program.
On success, <var>FpExecLE</var> does not return.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt>
<dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt>
<dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecv"/>
<link id="FpExecvp"/>
<link id="FpExecl"/>
<link id="FpExeclp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex11"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecL">
<short>Execute process (using argument list, environment)</short>
<descr>
<p>
<var>FpExecL</var> replaces the currently running program with the program, specified in
<var>PathName</var>. <var>S</var> is an array of command options.
The executable in <var>PathName</var> must be an absolute pathname.
The current process'  environment is passed to the program.
On success, <var>FpExecL</var> does not return.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt>
<dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt>
<dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecv"/>
<link id="FpExecvp"/>
<link id="FpExecle"/>
<link id="FpExeclp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex77"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecLP">
<short>Execute process (using argument list, environment; search path)</short>
<descr>
<var>FpExecLP</var> replaces the currently running program with the program, specified in
<var>PathName</var>. <var>S</var> is an array of command options.
The executable in <var>PathName</var> is searched in the path, if it isn't
an absolute filename.
The current environment is passed to the program.
On success, <var>FpExecLP</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel, or to split command line.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecv"/>
<link id="FpExecvp"/>
<link id="FpExecle"/>
<link id="FpExecl"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex76"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecV">
<short>Execute process</short>
<descr>
<var>FpExecV</var> replaces the currently running program with the program, specified in
<var>PathName</var>.
It gives the program the options in <var>args</var>.
This is a pointer to an array of pointers to null-terminated
strings. The last pointer in this array should be nil.
The current environment is passed to the program.
On success, <var>FpExecV</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecvp"/>
<link id="FpExecle"/>
<link id="FpExecl"/>
<link id="FpExeclp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex8"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecVP">
<short>Execute process, search path</short>
<descr>
<var>FpExecVP</var> replaces the currently running program with the program, specified in
<var>PathName</var>. The executable in <var>path</var> is searched in the path, if it isn't
an absolute filename.
It gives the program the options in <var>args</var>. This is a pointer to an array of pointers to null-terminated
strings. The last pointer in this array should be nil.
The current environment is passed to the program.
On success, <var>execvp</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecv"/>
<link id="FpExecle"/>
<link id="FpExecl"/>
<link id="FpExeclp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex79"/>
</element>

<!-- function Visibility: default -->
<element name="FpExecVPE">
<short>Execute process, search path using environment</short>
<descr>
<var>FpExecVP</var> replaces the currently running program with the program, specified in
<var>PathName</var>. The executable in <var>path</var> is searched in the path, if it isn't
an absolute filename.
It gives the program the options in <var>args</var>. This is a pointer to an array of pointers to null-terminated
strings. The last pointer in this array should be nil.
The environment in <var>Env</var> is passed to the program.
On success, <var>execvp</var> does not return.
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_eacces</dt>
<dd> File is not a regular file, or has no execute permission.
A compononent of the path has no search permission.</dd>
<dt>sys_eperm</dt><dd> The file system is mounted <i>noexec</i>.</dd>
<dt>sys_e2big</dt><dd> Argument list too big.</dd>
<dt>sys_enoexec</dt><dd> The magic number in the file is incorrect.</dd>
<dt>sys_enoent</dt><dd> The file does not exist.</dd>
<dt>sys_enomem</dt><dd> Not enough memory for kernel.</dd>
<dt>sys_enotdir</dt><dd> A component of the path is not a directory.</dd>
<dt>sys_eloop</dt><dd> The path contains a circular reference (via symlinks).</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
<link id="FpExecv"/>
<link id="FpExecle"/>
<link id="FpExecl"/>
<link id="FpExeclp"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
</seealso>
<example file="unixex/ex79"/>
</element>

<!-- function Visibility: default -->
<element name="Shell">
<short>Execute and feed command to system shell </short>
<descr>
<var>Shell</var> invokes the bash shell (<file>/bin/sh</file>), and feeds it the
command <var>Command</var> (using the <var>-c</var> option). The function then waits
for the command to complete, and then returns the exit
status of the command, or 127 if it could not complete the <link id="#rtl.baseunix.FpFork">FpFork</link>
or <link id="#rtl.baseunix.fpexecve">FpExecve</link> calls.
</descr>
<errors>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</errors>
<seealso>
<link id="POpen"/>
<link id="FpSystem"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
</seealso>
<example file="unixex/ex56"/>
</element>

<!-- function Visibility: default -->
<element name="fpSystem">
<short>Execute and feed command to system shell </short>
<descr>
<var>Shell</var> invokes the bash shell (<file>/bin/sh</file>), and feeds it the
command <var>Command</var> (using the <var>-c</var> option). The function then waits
for the command to complete, and then returns the exit
status of the command, or 127 if it could not complete the <link id="#rtl.baseunix.FpFork">FpFork</link>
or <link id="#rtl.baseunix.fpexecve">FpExecve</link> calls.
</descr>
<errors>
Errors are reported in LinuxError.
</errors>
<seealso>
<link id="POpen"/>
<link id="Shell"/>
<link id="#rtl.baseunix.FpFork">FpFork</link>
<link id="#rtl.baseunix.fpexecve">FpExecve</link>
</seealso>
<example file="unixex/ex80"/>
</element>

<!-- function Visibility: default -->
<element name="WaitProcess">
<short>Wait for process to terminate.</short>
<descr>
<p>
<var>WaitProcess</var> waits for process <var>PID</var> to exit.
<var>WaitProcess</var> is equivalent to the <link id="#rtl.baseunix.FpWaitPID"/> call:
</p>
<code>
FpWaitPid(PID,@result,0)
</code>
<p>
Handles of Signal interrupts (errno=EINTR), and returns the Exitcode of 
Process <var>PID</var> (>=0) or -Status if it was terminated
</p>
</descr>
<errors>
None.
</errors>
<seealso>
<link id="#rtl.baseunix.FpWaitPID"/>
<link id="#rtl.baseunix.WTERMSIG"/>
<link id="#rtl.baseunix.WSTOPSIG"/>
<link id="#rtl.baseunix.WIFEXITED"/>
<link id="WIFSTOPPED"/>
<link id="#rtl.baseunix.WIFSIGNALED"/>
<link id="W_EXITCODE"/>
<link id="W_STOPCODE"/>
<link id="#rtl.baseunix.WEXITSTATUS"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="WIFSTOPPED">
<short>Check whether the process is currently stopped.</short>
<descr>
<var>WIFSTOPPED</var> checks <var>Status</var> and returns <var>true</var>
if the process is currently stopped. This is only possible if WUNTRACED was
specified in the options of <link id="#rtl.baseunix.FpWaitPID">FpWaitPID</link>.
</descr>
<seealso>
<link id="#rtl.baseunix.FpWaitPID"/>
<link id="WaitProcess"/>
<link id="#rtl.baseunix.WTERMSIG"/>
<link id="#rtl.baseunix.WSTOPSIG"/>
<link id="#rtl.baseunix.WIFEXITED"/>
<link id="#rtl.baseunix.WIFSIGNALED"/>
<link id="W_EXITCODE"/>
<link id="W_STOPCODE"/>
<link id="#rtl.baseunix.WEXITSTATUS"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="W_EXITCODE">
<short>Construct an exit status based on an return code and signal.</short>
<descr>
<var>W_EXITCODE</var> combines <var>ReturnCode</var> and <var>Signal</var>
to a status code fit for <var>WaitPid</var>.
</descr>
<seealso>
<link id="#rtl.baseunix.FpWaitPID"/>
<link id="WaitProcess"/>
<link id="#rtl.baseunix.WTERMSIG"/>
<link id="#rtl.baseunix.WSTOPSIG"/>
<link id="#rtl.baseunix.WIFEXITED"/>
<link id="WIFSTOPPED"/>
<link id="#rtl.baseunix.WIFSIGNALED"/>
<link id="W_EXITCODE"/>
<link id="W_STOPCODE"/>
<link id="#rtl.baseunix.WEXITSTATUS"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="W_STOPCODE">
<short>Construct an exit status based on a signal.</short>
<descr>
<var>W_STOPCODE</var> constructs an exit status based on 
<var>Signal</var>, which will cause <link id="#rtl.baseunix.WIFSIGNALED">WIFSIGNALED</link> to return
<var>True</var>
</descr>
<seealso>
<link id="#rtl.baseunix.FpWaitPID"/>
<link id="WaitProcess"/>
<link id="#rtl.baseunix.WTERMSIG"/>
<link id="#rtl.baseunix.WSTOPSIG"/>
<link id="#rtl.baseunix.WIFEXITED"/>
<link id="WIFSTOPPED"/>
<link id="#rtl.baseunix.WIFSIGNALED"/>
<link id="W_EXITCODE"/>
<link id="#rtl.baseunix.WEXITSTATUS"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fsync">
<short>Synchronize file's kernel data with disk.</short>
<descr>
<p>
<var>Fsync</var> synchronizes the kernel data for file <var>fd</var> (the
cache) with the disk. The call will not return till all file data was
written to disk.
</p>
<p>
If the call was succesfull, 0 is returned. On failure, a nonzero value is
returned.
</p>
</descr>
<errors>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</errors>
<seealso>
<link id="FpFLock"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fpFlock">
<short>Lock a file (advisory lock)</short>
<descr>
<p>
<var>FpFLock</var> implements file locking. it sets or removes a lock on the file
<var>F</var>. F can be of type <var>Text</var> or <var>File</var>, or it can be a linux
filedescriptor (a longint)
<var>Mode</var> can be one of the following constants :
</p>
<dl>
<dt>LOCK_SH</dt><dd>sets a shared lock.</dd>
<dt>LOCK_EX</dt><dd>sets an exclusive lock.</dd>
<dt>LOCK_UN</dt><dd>unlocks the file.</dd>
<dt>LOCK_NB</dt><dd>This can be OR-ed together with the other.
If this is done the application doesn't block when locking.
</dd>
</dl>
<p>
The function returns zero if successful, a nonzero return value indicates an
error.
</p>
</descr>
<errors>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</errors>
<seealso>
<link id="#rtl.baseunix.FpFcntl"/>
<link id="FSync"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fStatFS">
<short>Retrieve filesystem information from a file descriptor.</short>
<descr>
<p>
<var>fStatFS</var> returns in <var>Info</var> information about the filesystem
on which the file with file descriptor <var>fd</var> resides. 
<var>Info</var> is of type <link id="#rtl.unixtype.TStatfs">TStatFS</link>. 
</p>
<p>
The function returns zero if the call was succesful, a nonzero value is 
returned if the call failed.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_enotdir</dt><dd> A component of <var>Path</var> is not a directory.</dd>
<dt>sys_einval</dt><dd> Invalid character in <var>Path</var>.</dd>
<dt>sys_enoent</dt><dd> <var>Path</var> does not exist.</dd>
<dt>sys_eaccess</dt><dd> Search permission is denied for  component in<var>Path</var>.</dd>
<dt>sys_eloop</dt><dd> A circular symbolic link was encountered in <var>Path</var>.</dd>
<dt>sys_eio</dt><dd> An error occurred while reading from the filesystem.</dd>
</dl>
</errors>
<seealso>
<link id="StatFS"/>
<link id="FpLStat"/>
</seealso>
<example file="unixex/ex91"/>
</element>

<!-- function Visibility: default -->
<element name="StatFS">
<short>Retrieve filesystem information from a path.</short>
<descr>
<p>
<var>StatFS</var> returns in <var>Info</var> information about the filesystem on which the file
<var>Path</var> resides. 
<var>Info</var> is of type <link id="#rtl.unixtype.TStatfs">TStatFS</link>. 
</p>
<p>
The function returns zero if the call was succesful, a nonzero value is 
returned if the call failed.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_enotdir</dt><dd> A component of <var>Path</var> is not a directory.</dd>
<dt>sys_einval</dt><dd> Invalid character in <var>Path</var>.</dd>
<dt>sys_enoent</dt><dd> <var>Path</var> does not exist.</dd>
<dt>sys_eaccess</dt><dd> Search permission is denied for  component in<var>Path</var>.</dd>
<dt>sys_eloop</dt><dd> A circular symbolic link was encountered in <var>Path</var>.</dd>
<dt>sys_eio</dt><dd> An error occurred while reading from the filesystem.</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.FpStat"/>
<link id="FpLStat"/>
</seealso>
<example file="unixex/ex91"/>
</element>

<!-- function Visibility: default -->
<element name="SelectText">
<short>Wait for event on text file.</short>
<descr>
<var>SelectText</var> executes the <link id="#rtl.baseunix.FpSelect">FpSelect</link> 
call on a file of type
<var>Text</var>. You can specify a timeout in <var>TimeOut</var>. The SelectText call
determines itself whether it should check for read or write, depending on
how the file was opened : With <var>Reset</var> it is checked for reading, with
<var>Rewrite</var> and <var>Append</var> it is checked for writing.
</descr>
<errors>
See <link id="#rtl.baseunix.FpSelect"/>. <var>SYS_EBADF</var> can also mean that the file wasn't
opened.
</errors>
<seealso>
<link id="#rtl.baseunix.FpSelect"/>
</seealso>
</element>

<!-- procedure Visibility: default -->
<element name="SeekDir">
<short>Seek to position in directory</short>
<descr>
<p>
<var>SeekDir</var> sets the directory pointer to the <var>loc</var>-th entry in the
directory structure pointed to by <var>p</var>.
</p>
<p>
For an example, see <link id="#rtl.baseunix.fpOpenDir"/>.
</p>
</descr>
<errors>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</errors>
<seealso>
<link id="#rtl.baseunix.fpCloseDir"/>
<link id="#rtl.baseunix.fpReadDir"/>
<link id="#rtl.baseunix.fpOpenDir"/>
<link id="TellDir"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="TellDir">
<short>Return current location in a directory</short>
<descr>
<p>
<var>TellDir</var> returns the current location in the directory structure
pointed to by <var>p</var>. It returns -1 on failure.
</p>
<p>
For an example, see <link id="#rtl.baseunix.fpOpenDir"/>.
</p>
</descr>
<errors>
</errors>
<seealso>
<link id="#rtl.baseunix.fpCloseDir"/>
<link id="#rtl.baseunix.fpReadDir"/>
<link id="#rtl.baseunix.fpOpenDir"/>
<link id="SeekDir"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="AssignPipe">
<short>Create a set of pipe file handlers</short>
<descr>
<p>
<var>AssignePipe</var> creates a pipe, i.e. two file objects, one for input,
one for output. What is written to <var>Pipe_out</var>, can be read from
<var>Pipe_in</var>.
</p>
<p>
This call is overloaded. The in and out pipe can take three forms:
an typed or untyped file, a text file or a file descriptor.
</p>
<p>
If a text file is passed then reading and writing from/to the pipe
can be done through the usual <var>Readln(Pipe_in,...)</var> and
<var>Writeln(Pipe_out,...)</var> procedures.
</p>
<p>
The function returns <var>True</var> if everything went succesfully,
<var>False</var> otherwise.
</p>
</descr>
<errors>
<p>
In case the function fails and returns <var>False</var>, 
extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function:
</p>
<dl>
<dt>sys_emfile</dt>
<dd> Too many file descriptors for this process.</dd>
<dt>sys_enfile</dt>
<dd> The system file table is full.</dd>
</dl>
</errors>
<seealso>
<link id="POpen"/>
<link id="#rtl.baseunix.FpMkFifo"/>
</seealso>
<example file="unixex/ex36"/>
</element>

<!-- function Visibility: default -->
<element name="POpen">
<short>Pipe file to standard input/output of program</short>
<descr>
<var>POpen</var> runs the command specified in <var>Prog</var>,
and redirects the standard in or output of the
command to the other end of the pipe <var>F</var>. The parameter <var>rw</var>
indicates the direction of the pipe. If it is set to <var>'W'</var>, then F can
be used to write data, which will then be read by the command from stdinput.
If it is set to <var>'R'</var>, then the standard output of the command can be 
read from <var>F</var>. <var>F</var> should be reset or rewritten prior to using it.
<var>F</var> can be of type <var>Text</var> or <var>File</var>.
A file opened with <var>POpen</var> can be closed with <var>Close</var>, but also
with <link id="PClose"/>. The result is the same, but <var>PClose</var> returns the
exit status of the command <var>Prog</var>.
</descr>
<errors>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 
Errors  are essentially those of the Execve, Dup and AssignPipe commands.
</errors>
<seealso>
<link id="AssignPipe"/>
<link id="PClose"/>
</seealso>
<example file="unixex/ex37"/>
</element>

<!-- function Visibility: default -->
<element name="AssignStream">
<short>Assign stream for in and output to a program</short>
<descr>
<p>
<var>AssignStream</var> creates a 2 or 3 pipes, i.e. two (or three) file objects, one for 
input, one for output,(and one for standard error) the other ends of these 
pipes are connected to standard input and output (and standard error) of 
<var>Prog</var>. <var>Prog</var> is the name of a program (including path) with options,
 which will be executed.
</p>
<p>
What is written to <var>StreamOut</var>, will go to the standard input of
<var>Prog</var>. Whatever is written by <var>Prog</var> to it's standard output 
can be read from <var>StreamIn</var>. 
Whatever is written by <var>Prog</var> to it's standard error read from 
<var>StreamErr</var>, if present. 
</p>
<p>
Reading and writing happens through the usual <var>Readln(StreamIn,...)</var> and
<var>Writeln (StreamOut,...)</var> procedures.
</p>
<remark>
You should <em> not</em> use <var>Reset</var> or <var>Rewrite</var> on a 
file opened with <var>POpen</var>. This will close the file before re-opening 
it again, thereby closing the connection with the program.
</remark>
<p>
The function returns the process ID of the spawned process, or -1 in case of
error.
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 
</p>
<dl>
<dt>sys_emfile</dt>
<dd> Too many file descriptors for this process.</dd>
<dt>sys_enfile</dt>
<dd> The system file table is full.</dd>
</dl>
<p>
Other errors include the ones by the fork and exec programs
</p>
</errors>
<seealso>
<link id="AssignPipe"/>
<link id="POpen"/>
</seealso>
<example file="unixex/ex38"/>
</element>

<!-- function Visibility: default -->
<element name="GetDomainName">
<short>Return current domain name</short>
<descr>
Get the domain name of the machine on which the process is running.
An empty string is returned if the domain is not set.
</descr>
<errors>
None.
</errors>
<seealso>
<link id="GetHostName"/>
</seealso>
<example file="unixex/ex39"/>
</element>

<!-- function Visibility: default -->
<element name="GetHostName">
<short>Return host name</short>
<descr>
Get the hostname of the machine on which the process is running.
An empty string is returned if hostname is not set.
</descr>
<errors>
None.
</errors>
<seealso>
<link id="GetDomainName"/>
</seealso>
<example file="unixex/ex40"/>
</element>


<!-- function Visibility: default -->
<element name="FExpand">
<short>Expand filename to fully qualified path</short>
<descr>
<var>FExpand</var> expands <var>Path</var> to a full path, starting from root,
eliminating directory references such as . and .. from the result.
</descr>
<errors>
None
</errors>
<example file="unixex/ex45"/>
</element>

<!-- function Visibility: default -->
<element name="FSearch">
<short>Search for file in search path.</short>
<descr>
<p>
<var>FSearch</var> searches in <var>DirList</var>, a colon separated list of directories,
for a file named <var>Path</var>. It then returns a path to the found file.
</p>
<p>
The <var>CurrentDirStrategy</var> determines how the current directory is treated
when searching:
</p>
<dl>
<dt>NoCurrentDirectory</dt><dd><printshort id="TFSearchOption.NoCurrentDirectory"/></dd>
<dt>CurrentDirectoryFirst</dt><dd><printshort id="TFSearchOption.CurrentDirectoryFirst"/></dd>
<dt>CurrentDirectoryLast</dt><dd><printshort id="TFSearchOption.CurrentDirectoryLast"/></dd>
</dl>
<p>
It is mainly provided to mimic DOS search path behaviour. Default behaviour
is to search the current directory first.
</p>
</descr>
<errors>
An empty string if no such file was found.
</errors>
<seealso>
<link id="FExpand"/>
<link id="#rtl.unixutil.FNMatch"/>
</seealso>
<example file="unixex/ex46"/>
</element>

<!-- function Visibility: default -->
<element name="Glob">
<short>Find filenames matching a wildcard pattern</short>
<descr>
<p
>Glob returns a pointer to a glob structure which contains all filenames which
exist and match the pattern in <var>Path</var>.
The pattern can contain wildcard characters, which have their
usual meaning.
</p>
</descr>
<errors>
<p>
Returns nil on error, and extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 

</p>
<dl>
<dt>sys_enomem</dt><dd> No memory on heap for glob structure.</dd>
<dt>others</dt><dd> As returned by the opendir call, and sys_readdir.</dd>
</dl>
</errors>
<seealso>
<link id="GlobFree"/>
</seealso>
<example file="unixex/ex49"/>
</element>

<!-- procedure Visibility: default -->
<element name="Globfree">
<short>Free result of <link id="Glob"/> call</short>
<descr>
<p>
Releases the memory, occupied by a pglob structure. <var>P</var> is set to nil.
</p>
<p>
For an example, see <link id="Glob"/>.
</p>
</descr>
<errors>
None
</errors>
<seealso>
<link id="Glob"/> 
</seealso>
</element>

<!-- procedure Visibility: default -->
<element name="SigRaise">
<short>Raise a signal (send to current process)</short>
<descr>
<var>SigRaise</var> sends a <var>Sig</var> signal to the current process.
</descr>
<errors>
None.
</errors>
<seealso>
<link id="#rtl.baseunix.FpKill"/>
<link id="#rtl.baseunix.FpGetPid"/>
</seealso>
<example file="unixex/ex65"/>
</element>

<!-- function Visibility: default -->
<element name="FpMMap">
<short>Create memory map of a file</short>
<descr>
<p>
<var>FpMMap</var> maps or unmaps files or devices into memory. The different
arguments determine what and how the file is mapped:
</p>
<dl>
<dt>adr</dt>
<dd> Address where to mmap the device. This address is a hint,
and may not be followed.</dd>
<dt>len</dt><dd> Size (in bytes) of area to be mapped.</dd>
<dt>prot</dt>
<dd>
<p> Protection of mapped memory. This is a OR-ed combination of the
following constants:</p>
<dl>
<dt>PROT_EXEC</dt><dd> The memory can be executed.</dd>
<dt>PROT_READ</dt><dd> The memory can be read.</dd>
<dt>PROT_WRITE</dt><dd> The memory can be written.</dd>
<dt>PROT_NONE</dt><dd> The memory can not be accessed.</dd>
</dl>
</dd>
<dt>flags</dt><dd><p>Contains some options for the mmap call. It is an OR-ed
combination of the following constants:</p>
<dl>
<dt>MAP_FIXED</dt>
<dd> Do not map at another address than the given address. If the
address cannot be used, <var>MMap</var> will fail.</dd>
<dt>MAP_SHARED</dt>
<dd> Share this map with other processes that map this object.</dd>
<dt>MAP_PRIVATE</dt>
<dd> Create a private map with copy-on-write semantics.</dd>
<dt>MAP_ANONYMOUS</dt>
<dd> <var>fd</var> does not have to be a file descriptor.</dd>
</dl>
<p>
One of the options <var>MAP_SHARED</var> and <var>MAP_PRIVATE</var> must be present,
but not both at the same time.
</p>
</dd>
<dt>fd</dt><dd> File descriptor from which to map.</dd>
<dt>off</dt><dd> Offset to be used in file descriptor <var>fd</var>.</dd>
</dl>
<p>
The function returns a pointer to the mapped memory, or a -1 in case of en
error.
</p>
</descr>
<errors>
<p>
On error, -1 is returned and extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 
</p>
<dl>
<dt>Sys_EBADF</dt>
<dd> <var>fd</var> is not a valid file descriptor and 
<var>MAP_ANONYMOUS</var> was not specified.</dd>
<dt>Sys_EACCES</dt>
<dd><var>MAP_PRIVATE</var> was specified, but <var>fd</var> is not open for
reading. Or <var>MAP_SHARED</var> was asked and <var>PROT_WRITE</var> is  set, fd
is not open for writing</dd>
<dt>Sys_EINVAL</dt>
<dd> One of the record fields <var>Start</var>, <var>length</var> or
<var>offset</var> is invalid.</dd>
<dt>Sys_ETXTBUSY</dt>
<dd><var>MAP_DENYWRITE</var> was set but the object specified
by fd is open for writing.</dd>
<dt>Sys_EAGAIN</dt>
<dd><var>fd</var> is locked, or too much memory is locked.</dd>
<dt>Sys_ENOMEM</dt>
<dd> Not enough memory for this operation.</dd>
</dl>
</errors>
<seealso>
<link id="FpMUnMap"/>
</seealso>
<example file="unixex/ex66"/>
</element>

<!-- function Visibility: default -->
<element name="Fpmunmap">
<short>Unmap previously mapped memory block</short>
<descr>
<p>
<var>FpMUnMap</var> unmaps the memory block of size <var>Len</var>, pointed to by 
<var>Adr</var>, which was previously allocated with <link id="FpMMap"/>.
</p>
<p>
The function returns <var>True</var> if successful, <var>False</var> otherwise.
</p>
<p>
For an example, see <link id="FpMMap"/>.
</p>
</descr>
<errors>
In case of error the function returns a nonzero value, 
extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 
See <link id="FpMMap"/> for possible error values.
</errors>
<seealso>
<link id="FpMMap"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fpgettimeofday">
<short>Return kernel time of day in GMT</short>
<descr>
<p>
<var>FpGetTimeOfDay</var> returns the number of seconds since 00:00, January 1 
1970, GMT in a <var>timeval</var> record. This time NOT corrected any way,
not taking into account timezones, daylight savings time and so on.
</p>
<p>
It is simply a wrapper to the kernel system call. To get the local time,
<link id="GetTime"/>.
</p>
</descr>
<errors>
None.
</errors>
<seealso>
<link id="GetTime"/>
<link id="GetDateTime"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fpNice">
<short>Set process priority</short>
<descr>
<p>
<var>Nice</var> adds <var>-N</var> to the priority of the running process. The lower the
priority numerically, the less the process is favored.
Only the superuser can specify a negative <var>N</var>, i.e. increase the rate at
which the process is run.
</p>
<p>
If the function is succesful, zero is returned. On error, a nonzero value is returned. 
</p>
</descr>
<errors>
<p>
Extended error information is returned by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link> function. 
</p>
<dl>
<dt>sys_eperm</dt><dd> A non-superuser tried to specify a negative <var>N</var>, i.e.
do a priority increase.</dd>
</dl>
</errors>
<seealso>
<link id="FpGetPriority"/>
<link id="FpSetPriority"/>
</seealso>
<example file="unixex/ex15"/>
</element>

<!-- function Visibility: default -->
<element name="fpGetPriority">
<short>Return process priority</short>
<descr>
<p>
GetPriority returns the priority with which a process is running.
Which process(es) is determined by the <var>Which</var> and <var>Who</var> variables.
<var>Which</var> can be one of the pre-defined <var>Prio_Process</var>,
<var>Prio_PGrp</var>, <var>Prio_User</var>, in which case <var>Who</var> is the process ID, Process group ID or
User ID, respectively.
</p>
<p>
For an example, see <link id="FpNice"/>.
</p>
</descr>
<errors>
<p>
Error information is returned solely by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function:  a priority can be a positive or negative value.
</p>
<dl>
<dt>sys_esrch</dt>
<dd> No process found using <var>which</var> and <var>who</var>. </dd>
<dt>sys_einval</dt>
<dd> <var>Which</var> was not one of <var>Prio_Process</var>,
<var>Prio_Grp</var> or <var>Prio_User</var>.</dd>
</dl>
</errors>
<seealso>
<link id="FpSetPriority"/>
<link id="FpNice"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fpSetPriority">
<short>Set process priority</short>
<descr>
<p>
<var>fpSetPriority</var> sets the priority with which a process is running.
Which process(es) is determined by the <var>Which</var> and <var>Who</var> variables.
<var>Which</var> can be one of the pre-defined constants:
</p>
<dl>
<dt>Prio_Process</dt><dd><var>Who</var> is interpreted as process ID</dd>
<dt>Prio_PGrp</dt><dd><var>Who</var> is interpreted as process group ID</dd>
<dt>Prio_User</dt><dd><var>Who</var> is interpreted as user ID</dd>
</dl>
<p>
<var>Prio</var> is a value in the range -20 to 20.
</p>
<p>
For an example, see <link id="FpNice"/>.
</p>
<p>
The function returns zero on success, -1 on failure
</p>
</descr>
<errors>
<p>
Extended error information is returned  by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function.
</p>
<dl>
<dt>sys_esrch</dt>
<dd>No process found using <var>which</var> and <var>who</var>.</dd>
<dt>sys_einval</dt>
<dd> <var>Which</var> was not one of <var>Prio_Process</var>,
<var>Prio_Grp</var> or <var>Prio_User</var>.</dd>
<dt>sys_eperm</dt>
<dd>A process was found, but neither its effective or real
user ID match the effective user ID of the caller.</dd>
<dt>sys_eacces</dt>
<dd>A non-superuser tried to a priority increase.</dd>
</dl>
</errors>
<seealso>
<link id="FpGetPriority"/>
<link id="FpNice"/>
</seealso>
</element>

<!-- function Visibility: default -->
<element name="fpLstat">
<short>Return information about symbolic link. Do not follow the link</short>
<descr>
<var>FpLstat</var> gets information about the link specified in <var>Path</var>
(or <var>FileName</var>, and stores it in <var>Info</var>, which points to a
record of  type <var>TStat</var>. Contrary to <link
id="#rtl.baseunix.FpFStat">FpFstat</link>, it stores
information about the link, not about the file the link points to.
The function returns zero if the call was succesful, a nonzero return value
indicates failure.
failed.
</descr>
<errors>
<p>
Extended error information is returned  by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function.
</p>
<dl>
<dt>sys_enoent</dt><dd> <var>Path</var> does not exist.</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.FpFStat"/>
<link id="StatFS"/>
</seealso>
<example file="unixex/ex29"/>
</element>


<!-- function Visibility: default -->
<element name="fpSymlink">
<short>Create a symbolic link</short>
<descr>
<p>
<var>SymLink</var> makes <var>NewName</var> point to the file in
<var>OldName</var>, which doesn't necessarily exist. The two files 
DO NOT have the same inode number. This is known as a 'soft' link.
</p>
<p>The permissions of the link are irrelevant, as they are not used when
following the link. Ownership of the file is only checked in case of removal
or renaming of the link.
</p>
<p>
The function returns zero if the call was succesful, a nonzero value if the call
failed.
</p>
</descr>
<errors>
<p>
Extended error information is returned  by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function.
</p>
<dl>
<dt>sys_eperm</dt>
<dd>The filesystem containing oldpath and newpath does not
support linking files.</dd>
<dt>sys_eaccess</dt>
<dd>Write access for the directory containing <var>Newpath</var>
is disallowed, or one of the directories in <var>OldPath</var> or
<var>NewPath</var> has no search (=execute) permission.</dd>
<dt>sys_enoent</dt>
<dd>A directory entry in <var>OldPath</var> or <var>NewPath</var> does
not exist or is a symbolic link pointing to a non-existent directory.</dd>
<dt>sys_enotdir</dt>
<dd>A directory entry in <var>OldPath</var> or <var>NewPath</var> is
nor a directory.</dd>
<dt>sys_enomem</dt><dd>Insufficient kernel memory.</dd>
<dt>sys_erofs</dt><dd>The files are on a read-only filesystem.</dd>
<dt>sys_eexist</dt><dd><var>NewPath</var> already exists.</dd>
<dt>sys_eloop</dt>
<dd> <var>OldPath</var> or <var>NewPath</var> has a reference to a circular
symbolic link, i.e. a symbolic link, whose expansion points to itself.
</dd>
<dt>sys_enospc</dt>
<dd>The device containing <var>NewPath</var> has no room for another entry.</dd>
</dl>
</errors>
<seealso>
<link id="#rtl.baseunix.FpLink"/>
<link id="#rtl.baseunix.FpUnLink"/>
<link id="FpReadLink"/>
</seealso>
<example file="unixex/ex22"/>
</element>

<!-- function Visibility: default -->
<element name="fpReadLink">
<short>Read destination of symbolic link</short>
<descr>
<p>
<var>FpReadLink</var> returns the file the symbolic link <var>name</var> is pointing
to. The first form of this function accepts a buffer <var>linkname</var> of
length <var>maxlen</var> where the filename will be stored. It returns the
actual number of characters stored in the buffer.
</p>
<p>
The second form of the function returns simply the name of the file.
</p>
</descr>
<errors>
<p>
On error, the first form of the function returns -1; the second one returns
an empty string.
Extended error information is returned  by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function.
</p>
<dl>
<dt>SYS_ENOTDIR</dt>
<dd>A part of the path in <var>Name</var> is not a directory.</dd>
<dt>SYS_EINVAL</dt>
<dd>maxlen is not positive, or the  file is not a symbolic link.</dd>
<dt>SYS_ENAMETOOLONG</dt>
<dd>A pathname, or a component of a pathname, was too long.</dd>
<dt>SYS_ENOENT</dt>
<dd>the link <var>name</var> does not exist.</dd>
<dt>SYS_EACCES</dt>
<dd>No permission to search a directory in the path</dd>
<dt>SYS_ELOOP</dt>
<dd>Too many symbolic links were encountered in  translating the pathname.</dd>
<dt>SYS_EIO</dt>
<dd>An I/O error occurred while reading from the file system.</dd>
<dt>SYS_EFAULT</dt>
<dd>The buffer is not part of the the process's memory space.</dd>
<dt>SYS_ENOMEM</dt>
<dd>Not enough kernel memory was available.</dd>
</dl>
</errors>
<seealso>
<link id="FpSymLink"/>
</seealso>
<example file="unixex/ex62"/>
</element>

<!-- function Visibility: default -->
<element name="PClose">
<short>Close file opened with <link id="POpen"/></short>
<descr>
<p>
<var>PClose</var> closes a file opened with <link id="POpen"/>. 
It waits for the command to complete, and then returns the exit status of the command. 
</p>
<p>
For an example, see <link id="POpen"/>
</p>
</descr>
<errors>
Extended error information is returned  by the <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
function.
</errors>
<seealso>
<link id="POpen"/>
</seealso>
</element>


</module> <!-- Unix -->
</package>
</fpdoc-descriptions>