Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 99 insertions, 0 deletions

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+.TH FORK 3am "Jan 15 2013" "Free Software Foundation" "GNU Awk Extension Modules"
+.SH NAME
+fork, wait, waitpid \- basic process management
+.SH SYNOPSIS
+.ft CW
+@load "fork"
+.sp
+pid = fork()
+.sp
+ret = waitpid(pid)
+.sp
+ret = wait();
+.ft R
+.SH DESCRIPTION
+The
+.I fork
+extension adds three functions, as follows.
+.TP
+.B fork()
+This function creates a new process. The return value is the zero
+in the child and the process-id number of the child in the parent,
+or \-1 upon error. In the latter case,
+.B ERRNO
+indicates the problem.
+In the child, \fBPROCINFO["pid"]\fP and \fBPROCINFO["ppid"]\fP
+are updated to reflect the correct values.
+.TP
+.B waitpid()
+This function takes a numeric argument, which is the process-id to
+wait for. The return value is that of the
+.IR waitpid (2)
+system call.
+.TP
+.B wait()
+This function waits for the first child to die.
+The return value is that of the
+.IR wait (2)
+system call.
+.\" .SH NOTES
+.SH BUGS
+There is no corresponding
+.B exec()
+function.
+.PP
+The interfaces could be enhanced to provide more facilities,
+including pulling out the various bits of the return status.
+.SH EXAMPLE
+.ft CW
+.nf
+@load "fork"
+\&...
+if ((pid = fork()) == 0)
+    print "hello from the child"
+else
+    print "hello from the parent"
+.fi
+.ft R
+.SH "SEE ALSO"
+.IR "GAWK: Effective AWK Programming" ,
+.IR filefuncs (3am),
+.IR fnmatch (3am),
+.IR inplace (3am),
+.IR ordchr (3am),
+.IR readdir (3am),
+.IR readfile (3am),
+.IR revoutput (3am),
+.IR rwarray (3am),
+.IR time (3am).
+.PP
+.IR fork (2),
+.IR wait (2),
+.IR waitpid (2).
+.SH AUTHOR
+Arnold Robbins,
+.BR arnold@skeeve.com .
+.SH COPYING PERMISSIONS
+Copyright \(co 2012, 2013,
+Free Software Foundation, Inc.
+.PP
+Permission is granted to make and distribute verbatim copies of
+this manual page provided the copyright notice and this permission
+notice are preserved on all copies.
+.ig
+Permission is granted to process this file through troff and print the
+results, provided the printed document carries copying permission
+notice identical to this one except for the removal of this paragraph
+(this paragraph not being relevant to the printed manual page).
+..
+.PP
+Permission is granted to copy and distribute modified versions of this
+manual page under the conditions for verbatim copying, provided that
+the entire resulting derived work is distributed under the terms of a
+permission notice identical to this one.
+.PP
+Permission is granted to copy and distribute translations of this
+manual page into another language, under the above conditions for
+modified versions, except that this permission notice may be stated in
+a translation approved by the Foundation.
+.\" vim: set filetype=nroff :