explain_setregid_or_die - set real and/or effective group ID and report errors

       libexplain version 1.4
       Copyright (C) 2012 Peter Miller

                                                                                      explain_setregid_or_die(3)

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

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

       rgid    The rgid, exactly as to be passed to the setregid(2) system call.

       egid    The egid, exactly as to be passed to the setregid(2) system call.

       The  explain_setregid_or_die  function  is  intended  to  be  used  in a fashion similar to the following
       example:
              explain_setregid_or_die(rgid, egid);

       explain_setregid_or_die - set real and/or effective group ID and report errors

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

       The explain_setregid_on_error function always returns the value return by the wrapped setregid(2)  system
       call.

setregid(2)
               set real and/or effective group ID

       explain_setregid(3)
               explain setregid(2) errors

       exit(2) terminate the calling process

       #include <libexplain/setregid.h>
       void explain_setregid_or_die(gid_t rgid, gid_t egid);
       int explain_setregid_on_error(gid_t rgid, gid_t egid);