explain_setreuid_or_die - set the real and effective user ID and report errors

       libexplain version 1.4
       Copyright (C) 2012 Peter Miller

                                                                                      explain_setreuid_or_die(3)

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

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

       ruid    The ruid, exactly as to be passed to the setreuid(2) system call.

       euid    The euid, exactly as to be passed to the setreuid(2) system call.

       The  explain_setreuid_or_die  function  is  intended  to  be  used  in a fashion similar to the following
       example:
              explain_setreuid_or_die(ruid, euid);

       explain_setreuid_or_die - set the real and effective user ID and report errors

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

       The explain_setreuid_on_error function always returns the value return by the wrapped setreuid(2)  system
       call.

setreuid(2)
               set the real and effective user ID

       explain_setreuid(3)
               explain setreuid(2) errors

       exit(2) terminate the calling process

       #include <libexplain/setreuid.h>
       void explain_setreuid_or_die(uid_t ruid, uid_t euid);
       int explain_setreuid_on_error(uid_t ruid, uid_t euid);