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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) sys-
       tem 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, ob-
       tained 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 1.3
       Copyright (C) 2011 Peter	Miller

						     explain_getpgid_or_die(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLE | SEE ALSO | COPYRIGHT

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