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author | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
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committer | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
commit | ccacc920f9cd610a9a9d8e800f623c20bf43a702 (patch) | |
tree | daec40c266097bb1d38f10254010691b0131d4cc /doc/DetachPids.3 | |
parent | 8ffb8fa76d0d34283e491044dd28385674ba113e (diff) | |
download | tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.zip tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.gz tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.bz2 |
First stage of doing GOOBE improvements to documentation now that the html generation works
Diffstat (limited to 'doc/DetachPids.3')
-rw-r--r-- | doc/DetachPids.3 | 154 |
1 files changed, 77 insertions, 77 deletions
diff --git a/doc/DetachPids.3 b/doc/DetachPids.3 index 91535a9..3ab4fe1 100644 --- a/doc/DetachPids.3 +++ b/doc/DetachPids.3 @@ -1,77 +1,77 @@ -'\" -'\" Copyright (c) 1989-1993 The Regents of the University of California. -'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. -'\" -'\" See the file "license.terms" for information on usage and redistribution -'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" -'\" RCS: @(#) $Id: DetachPids.3,v 1.4 2004/10/07 14:44:32 dkf Exp $ -'\" -.so man.macros -.TH Tcl_DetachPids 3 "" Tcl "Tcl Library Procedures" -.BS -.SH NAME -Tcl_DetachPids, Tcl_ReapDetachedProcs, Tcl_WaitPid \- manage child processes in background -.SH SYNOPSIS -.nf -\fB#include <tcl.h>\fR -.sp -\fBTcl_DetachPids\fR(\fInumPids, pidPtr\fR) -.sp -\fBTcl_ReapDetachedProcs\fR() -.sp -Tcl_Pid -\fBTcl_WaitPid\fR(\fIpid, statusPtr, options\fR) -.SH ARGUMENTS -.AS Tcl_Pid *statusPtr out -.AP int numPids in -Number of process ids contained in the array pointed to by \fIpidPtr\fR. -.AP int *pidPtr in -Address of array containing \fInumPids\fR process ids. -.AP Tcl_Pid pid in -The id of the process (pipe) to wait for. -.AP int *statusPtr out -The result of waiting on a process (pipe). Either 0 or ECHILD. -.AP int options in -The options controlling the wait. WNOHANG specifies not to wait when -checking the process. -.BE -.SH DESCRIPTION -.PP -\fBTcl_DetachPids\fR and \fBTcl_ReapDetachedProcs\fR provide a -mechanism for managing subprocesses that are running in background. -These procedures are needed because the parent of a process must -eventually invoke the \fBwaitpid\fR kernel call (or one of a few other -similar kernel calls) to wait for the child to exit. Until the -parent waits for the child, the child's state cannot be completely -reclaimed by the system. If a parent continually creates children -and doesn't wait on them, the system's process table will eventually -overflow, even if all the children have exited. -.PP -\fBTcl_DetachPids\fR may be called to ask Tcl to take responsibility -for one or more processes whose process ids are contained in the -\fIpidPtr\fR array passed as argument. The caller presumably -has started these processes running in background and doesn't -want to have to deal with them again. -.PP -\fBTcl_ReapDetachedProcs\fR invokes the \fBwaitpid\fR kernel call -on each of the background processes so that its state can be cleaned -up if it has exited. If the process hasn't exited yet, -\fBTcl_ReapDetachedProcs\fR doesn't wait for it to exit; it will check again -the next time it is invoked. -Tcl automatically calls \fBTcl_ReapDetachedProcs\fR each time the -\fBexec\fR command is executed, so in most cases it isn't necessary -for any code outside of Tcl to invoke \fBTcl_ReapDetachedProcs\fR. -However, if you call \fBTcl_DetachPids\fR in situations where the -\fBexec\fR command may never get executed, you may wish to call -\fBTcl_ReapDetachedProcs\fR from time to time so that background -processes can be cleaned up. -.PP -\fBTcl_WaitPid\fR is a thin wrapper around the facilities provided by -the operating system to wait on the end of a spawned process and to -check a whether spawned process is still running. It is used by -\fBTcl_ReapDetachedProcs\fR and the channel system to portably access -the operating system. - -.SH KEYWORDS -background, child, detach, process, wait +'\"
+'\" Copyright (c) 1989-1993 The Regents of the University of California.
+'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\"
+'\" RCS: @(#) $Id: DetachPids.3,v 1.5 2007/10/28 14:17:38 dkf Exp $
+'\"
+.so man.macros
+.TH Tcl_DetachPids 3 "" Tcl "Tcl Library Procedures"
+.BS
+.SH NAME
+Tcl_DetachPids, Tcl_ReapDetachedProcs, Tcl_WaitPid \- manage child processes in background
+.SH SYNOPSIS
+.nf
+\fB#include <tcl.h>\fR
+.sp
+\fBTcl_DetachPids\fR(\fInumPids, pidPtr\fR)
+.sp
+\fBTcl_ReapDetachedProcs\fR()
+.sp
+Tcl_Pid
+\fBTcl_WaitPid\fR(\fIpid, statusPtr, options\fR)
+.SH ARGUMENTS
+.AS Tcl_Pid *statusPtr out
+.AP int numPids in
+Number of process ids contained in the array pointed to by \fIpidPtr\fR.
+.AP int *pidPtr in
+Address of array containing \fInumPids\fR process ids.
+.AP Tcl_Pid pid in
+The id of the process (pipe) to wait for.
+.AP int *statusPtr out
+The result of waiting on a process (pipe). Either 0 or ECHILD.
+.AP int options in
+The options controlling the wait. WNOHANG specifies not to wait when
+checking the process.
+.BE
+.SH DESCRIPTION
+.PP
+\fBTcl_DetachPids\fR and \fBTcl_ReapDetachedProcs\fR provide a
+mechanism for managing subprocesses that are running in background.
+These procedures are needed because the parent of a process must
+eventually invoke the \fBwaitpid\fR kernel call (or one of a few other
+similar kernel calls) to wait for the child to exit. Until the
+parent waits for the child, the child's state cannot be completely
+reclaimed by the system. If a parent continually creates children
+and doesn't wait on them, the system's process table will eventually
+overflow, even if all the children have exited.
+.PP
+\fBTcl_DetachPids\fR may be called to ask Tcl to take responsibility
+for one or more processes whose process ids are contained in the
+\fIpidPtr\fR array passed as argument. The caller presumably
+has started these processes running in background and does not
+want to have to deal with them again.
+.PP
+\fBTcl_ReapDetachedProcs\fR invokes the \fBwaitpid\fR kernel call
+on each of the background processes so that its state can be cleaned
+up if it has exited. If the process has not exited yet,
+\fBTcl_ReapDetachedProcs\fR does not wait for it to exit; it will check again
+the next time it is invoked.
+Tcl automatically calls \fBTcl_ReapDetachedProcs\fR each time the
+\fBexec\fR command is executed, so in most cases it is not necessary
+for any code outside of Tcl to invoke \fBTcl_ReapDetachedProcs\fR.
+However, if you call \fBTcl_DetachPids\fR in situations where the
+\fBexec\fR command may never get executed, you may wish to call
+\fBTcl_ReapDetachedProcs\fR from time to time so that background
+processes can be cleaned up.
+.PP
+\fBTcl_WaitPid\fR is a thin wrapper around the facilities provided by
+the operating system to wait on the end of a spawned process and to
+check a whether spawned process is still running. It is used by
+\fBTcl_ReapDetachedProcs\fR and the channel system to portably access
+the operating system.
+
+.SH KEYWORDS
+background, child, detach, process, wait
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