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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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2006-02-15 23:15:29 +00:00
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.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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2006-05-22 23:52:24 +00:00
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.\" and Copyright (c) 2004 by Michael Kerrisk (mtk-manpages@gmx.net)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" License.
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.\"
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.\" Modified Sat Jul 24 13:32:44 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Mon Jun 23 14:09:52 1997 by aeb - add EINTR.
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.\" Modified Tue Jul 7 12:26:42 1998 by aeb - changed return value wait3
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.\" Modified 2004-11-11, Michael Kerrisk <mtk-manpages@gmx.net>
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.\" Rewrote much of this page, and removed much duplicated text,
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.\" replacing with pointers to wait.2
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.\"
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2004-11-11 14:39:29 +00:00
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.TH WAIT4 2 2004-11-11 "Linux" "Linux Programmer's Manual"
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.SH NAME
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wait3, wait4 \- wait for process to change state, BSD style
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.SH SYNOPSIS
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.nf
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.B #define _BSD_SOURCE
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/* Or #define _XOPEN_SOURCE 500 for wait3() */
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.B #include <sys/types.h>
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.B #include <sys/time.h>
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.B #include <sys/resource.h>
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.B #include <sys/wait.h>
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.sp
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.BI "pid_t wait3(int *" "status" ", int " options ,
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.BI " struct rusage *" rusage );
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.sp
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.BI "pid_t wait4(pid_t " pid ", int *" status ", int " options ,
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.BI " struct rusage *" rusage );
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.fi
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.SH DESCRIPTION
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The
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.BR wait3 ()
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and
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.BR wait4 ()
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system calls are similar to
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.BR waitpid (2),
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but additionally return resource usage information about the
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child in the structure pointed to by
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.IR rusage .
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.PP
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Other than the use of the
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.I rusage
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argument, the following
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.BR wait3 ()
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call:
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.nf
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wait3(status, options, rusage);
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2004-11-11 14:39:29 +00:00
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.fi
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is equivalent to:
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.nf
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2005-07-06 12:57:38 +00:00
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waitpid(\-1, status, options);
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.fi
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Similarly, the following
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.BR wait4 ()
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call:
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.nf
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wait4(pid, status, options, rusage);
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.fi
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is equivalent to:
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.nf
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waitpid(pid, status, options);
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.fi
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In other words,
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.BR wait3 ()
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waits of any child, while
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.BR wait4 ()
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can be used to select a specific child, or children, on which to wait.
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See
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.BR wait (2)
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for further details.
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.PP
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If
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.I rusage
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is not NULL, the
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.I struct rusage
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to which it points will be filled with accounting information
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about the child.
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See
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.BR getrusage (2)
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for details.
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.SH "RETURN VALUE"
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As for
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.BR waitpid (2).
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.SH ERRORS
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As for
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.BR waitpid (2).
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.SH NOTES
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Including
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.I <sys/time.h>
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is not required these days, but increases portability.
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(Indeed,
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.I <sys/resource.h>
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defines the
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.I rusage
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structure with fields of type
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.I struct timeval
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defined in
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.IR <sys/time.h> .)
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.SH "CONFORMING TO"
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4.3BSD
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.SH "SEE ALSO"
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.BR fork (2),
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.BR getrusage (2),
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.BR sigaction (2),
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.BR signal (2),
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.BR wait (2),
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2007-01-28 20:00:24 +00:00
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.BR feature_test_macros (7),
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.BR signal (7)
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