explain_setpgrp_or_die(3)				     Library Functions Manual					 explain_setpgrp_or_die(3)

NAME

       explain_setpgrp_or_die - set process group and report errors

SYNOPSIS

       #include <libexplain/setpgrp.h>
       void explain_setpgrp_or_die(pid_t pid, pid_t pgid);
       int explain_setpgrp_on_error(pid_t pid, pid_t pgid);

DESCRIPTION

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

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

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

       pgid    The pgid, exactly as to be passed to the setpgrp(2) system call.

       Note:  the  setpgrp(2)  function  has two implementations.  The System V version has no arguments, while the BSD version has two arguments.
       For simplicity of implementation, the argument list seen here includes the pid and pgid arguments.

       The System V getpgid() semantics can be obtained by calling setpgrp(0, 0) on systems with the BSD version, and this is the API  for  libex-
       plain, even on systems that do not use the BSD API.

RETURN VALUE

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

       The explain_setpgrp_on_error function always returns the value return by the wrapped setpgrp(2) system call.

EXAMPLE

       The explain_setpgrp_or_die function is intended to be used in a fashion similar to the following example:
	      explain_setpgrp_or_die(pid, pgid);

SEE ALSO

       setpgrp(2)
	       set process group

       explain_setpgrp(3)
	       explain setpgrp(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2011 Peter Miller

															 explain_setpgrp_or_die(3)