explain_wait3_or_die(3) [debian man page]

explain_wait3_or_die(3) 				     Library Functions Manual					   explain_wait3_or_die(3)

NAME

       explain_wait3_or_die - wait for process to change state and report errors

SYNOPSIS

       #include <libexplain/wait3.h>
       void explain_wait3_or_die(int *status, int options, struct rusage *rusage);

DESCRIPTION

       The  explain_wait3_or_die function is used to call the wait3(2) system call.  On failure an explanation will be printed to stderr, obtained
       from explain_wait3(3), and then the process terminates by calling exit(EXIT_FAILURE).

       This function is intended to be used in a fashion similar to the following example:
	      int pid = explain_wait3_or_die(status, options, rusage);

       status  The status, exactly as to be passed to the wait3(2) system call.

       options The options, exactly as to be passed to the wait3(2) system call.

       rusage  The rusage, exactly as to be passed to the wait3(2) system call.

       Returns:
	       This function only returns on success.  On failure, prints an explanation and exits.

SEE ALSO

       wait3(2)
	       wait for process to change state

       explain_wait3(3)
	       explain wait3(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

															   explain_wait3_or_die(3)

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 3.25 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								    2008-09-28								  WAIT4(2)