debian man page for explain_getpgid_or_die

explain_getpgid_or_die(3)				     Library Functions Manual					 explain_getpgid_or_die(3)

NAME
       explain_getpgid_or_die - get process group and report errors

SYNOPSIS
       #include <libexplain/getpgid.h>
       pid_t explain_getpgid_or_die(pid_t pid);
       pid_t explain_getpgid_on_error(pid_t pid);

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

       The explain_getpgid_on_error function is used to call the getpgid(2) system call. On failure an explanation  will  be  printed  to  stderr,
       obtained from the explain_getpgid(3) function, but still returns to the caller.

       pid     The pid, exactly as to be passed to the getpgid(2) system call.

RETURN VALUE
       The  explain_getpgid_or_die  function  only  returns on success, see getpgid(2) for more information. On failure, prints an explanation and
       exits, it does not return.

       The explain_getpgid_on_error function always returns the value return by the wrapped getpgid(2) system call.

EXAMPLE
       The explain_getpgid_or_die function is intended to be used in a fashion similar to the following example:
	      pid_t result = explain_getpgid_or_die(pid);

SEE ALSO
       getpgid(2)
	       get process group

       explain_getpgid(3)
	       explain getpgid(2) errors

       exit(2) terminate the calling process

COPYRIGHT
       libexplain version 0.52
       Copyright (C) 2011 Peter Miller

															 explain_getpgid_or_die(3)