explain_setgrent_or_die - rewind group database and report errors

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                                      explain_setgrent_or_die(3)

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

       The  explain_setgrent_on_error  function  is  used  to  call  the  setgrent(3) system call. On failure an
       explanation will be printed to stderr, obtained from the explain_setgrent(3) function, but still  returns
       to the caller.

       The  explain_setgrent_or_die  function  is  intended  to  be  used  in a fashion similar to the following
       example:
              explain_setgrent_or_die();

       explain_setgrent_or_die - rewind group database and report errors

       The  explain_setgrent_or_die  function  only returns on success, see setgrent(3) for more information. On
       failure, prints an explanation and exits, it does not return.

       The explain_setgrent_on_error function always returns the value return by the wrapped setgrent(3)  system
       call.

setgrent(3)
               rewind to the start of the group database

       explain_setgrent(3)
               explain setgrent(3) errors

       exit(2) terminate the calling process

       #include <libexplain/setgrent.h>
       void explain_setgrent_or_die(void);
       void explain_setgrent_on_error(void);