WAIT4(2) Linux Programmer's Manual WAIT4(2)

NAME
       wait3, wait4 - wait for process to change state, BSD style

SYNOPSIS
       #include 
       #include 
       #include 
       #include 

       pidt wait3(int *status, int options,
                   struct rusage *rusage);

       pidt wait4(pidt pid, int *status, int options,
                   struct rusage *rusage);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       wait3():
           BSDSOURCE || XOPENSOURCE >= 500 ||
           XOPENSOURCE && XOPENSOURCEEXTENDED
       wait4():
           BSDSOURCE

DESCRIPTION
       These functions are obsolete; use waitpid(2) or waitid(2) in  new  pro‐
       grams.

       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  is not required these days, but increases porta‐
       bility.   (Indeed,    defines the rusage structure with
       fields of type struct timeval defined in .)

       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 3.53 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)