03-15-2011
Quote:
Originally Posted by man pclose
The pclose() function waits for the associated process to terminate and
returns the exit status of the command as returned by wait4(2).
Quote:
Originally Posted by man wait4
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.
Quote:
Originally Posted by man waitpid
All of these system calls (wait, waitpid, waitid...) are used to wait for state changes in a child
of the calling process, and obtain information about the child whose
state has changed. A state change is considered to be: the child ter‐
minated; the child was stopped by a signal; or the child was resumed by
a signal. In the case of a terminated child, performing a wait allows
the system to release the resources associated with the child; if a
wait is not performed, then the terminated child remains in a "zombie"
state (see NOTES below).
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WAIT4(2) Linux Programmer's Manual WAIT4(2)
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 || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
wait4():
_BSD_SOURCE
DESCRIPTION
These functions are obsolete; use waitpid(2) or waitid(2) in new programs.
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.
SUSv1 included a specification of wait3(); SUSv2 included wait3(), but marked it LEGACY; SUSv3 removed it.
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>.)
On Linux, wait3() is a library function implemented on top of the wait4() system call.
SEE ALSO
fork(2), getrusage(2), sigaction(2), signal(2), wait(2), signal(7)
COLOPHON
This page is part of release 3.44 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/.
Linux 2012-09-23 WAIT4(2)