explain_setuid_or_die - set user identity and report errors

       libexplain version 1.4
       Copyright (C) 2012 Peter Miller

                                                                                        explain_setuid_or_die(3)

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

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

       uid     The uid, exactly as to be passed to the setuid(2) system call.

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

       explain_setuid_or_die - set user identity and report errors

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

       The explain_setuid_on_error function always returns the value return  by  the  wrapped  setuid(2)  system
       call.

setuid(2)
               set user identity

       explain_setuid(3)
               explain setuid(2) errors

       exit(2) terminate the calling process

       #include <libexplain/setuid.h>
       void explain_setuid_or_die(int uid);
       int explain_setuid_on_error(int uid);