wait4 man page on Archlinux

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

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

       #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)):

	   _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||

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

       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.

       As for waitpid(2).

       As for waitpid(2).


       SUSv1  included a specification of wait3(); SUSv2 included wait3(), but
       marked it LEGACY; SUSv3 removed it.

       Including <sys/time.h> is not required these days, but increases porta‐
       bility.	 (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.

       fork(2), getrusage(2), sigaction(2), signal(2), wait(2), signal(7)

       This  page  is  part of release 3.65 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)

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