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WAIT4
Section: Linux Programmer's Manual (2)
Updated: 2007-07-26
Index
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NAME
wait3, wait4 - wait for process to change state, BSD style
SYNOPSIS
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
pid_t wait3(int *status, int options,
struct rusage *rusage);
pid_t wait4(pid_t pid, int *status, int options,
struct rusage *rusage);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
wait3():
_BSD_SOURCE
wait4():
_BSD_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
The
wait3()
and
wait4()
system calls are similar to
waitpid(2),
but additionally return resource usage information about the
child in the structure pointed to by
rusage.
Other than the use of the
rusage
argument, the following
wait3()
call:
wait3(status, options, rusage);
is equivalent to:
waitpid(-1, status, options);
Similarly, the following
wait4()
call:
wait4(pid, status, options, rusage);
is equivalent to:
waitpid(pid, status, options);
In other words,
wait3()
waits of any child, while
wait4()
can be used to select a specific child, or children, on which to wait.
See
wait(2)
for further details.
If
rusage
is not NULL, the
struct rusage
to which it points will be filled with accounting information
about the child.
See
getrusage(2)
for details.
RETURN VALUE
As for
waitpid(2).
ERRORS
As for
waitpid(2).
CONFORMING TO
4.3BSD.
NOTES
Including
<sys/time.h>
is not required these days, but increases portability.
(Indeed,
<sys/resource.h>
defines the
rusage
structure with fields of type
struct timeval
defined in
<sys/time.h>.)
SEE ALSO
fork(2),
getrusage(2),
sigaction(2),
signal(2),
wait(2),
signal(7)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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