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 1.4
       Copyright (C) 2011 Peter Miller

                                                                        explain_getpgid_or_die(3)