explain_nice_or_die - change process priority and report errors

       libexplain version 1.4
       Copyright (C) 2009 Peter Miller

                                                                                          explain_nice_or_die(3)

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

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

       inc     The inc, exactly as to be passed to the nice(2) system call.

       The explain_nice_or_die function is intended to be used in a fashion similar to the following example:
              int result = explain_nice_or_die(inc);

       explain_nice_or_die - change process priority and report errors

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

       The explain_nice_on_error function always returns the value return by the wrapped nice(2) system call.

nice(2) change process priority

       explain_nice(3)
               explain nice(2) errors

       exit(2) terminate the calling process

       #include <libexplain/nice.h>
       int explain_nice_or_die(int inc);
       int explain_nice_on_error(int inc);