explain_setresgid_or_die - set r/e/s group ID and report errors

       libexplain version 1.4
       Copyright (C) 2012 Peter Miller

                                                                                     explain_setresgid_or_die(3)

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

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

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

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

       sgid    The sgid, exactly as to be passed to the setresgid(2) system call.

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

       explain_setresgid_or_die - set r/e/s group ID and report errors

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

       The  explain_setresgid_on_error  function  always  returns  the  value return by the wrapped setresgid(2)
       system call.

setresgid(2)
               set real, effective and saved group ID

       explain_setresgid(3)
               explain setresgid(2) errors

       exit(2) terminate the calling process

       #include <libexplain/setresgid.h>
       void explain_setresgid_or_die(gid_t rgid, gid_t egid, gid_t sgid);
       int explain_setresgid_on_error(gid_t rgid, gid_t egid, gid_t sgid);