NAME

       explain_getpgrp_or_die - get process group and report errors

SYNOPSIS

       #include <libexplain/getpgrp.h>
       pid_t explain_getpgrp_or_die(pid_t pid);
       pid_t explain_getpgrp_on_error(pid_t pid);

DESCRIPTION

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

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

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

   API Inconsistencies
       Note:  the  getpgrp(2)  function  has  two  implementations.   The  POSIX.1 version has no
       arguments, while the BSD version has one argument.  For simplicity of implementation,  the
       argument list seen here includes the pid argument.

       The POSIX.1 getpgid() semanatics can be obtained by calling getpgrp(0) on BSD systems, and
       this is the API for libexplain, even on systems that do not use the BSD API.

RETURN VALUE

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

       The  explain_getpgrp_on_error  function  always  returns  the  value return by the wrapped
       getpgrp(2) system call.

EXAMPLE

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

SEE ALSO

       getpgrp(2)
               get process group

       explain_getpgrp(3)
               explain getpgrp(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2011 Peter Miller

                                                                        explain_getpgrp_or_die(3)