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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
       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>.)

       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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-09-28                          WAIT4(2)

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