explain_setpriority_or_die - set program scheduling priority and report errors

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                                   explain_setpriority_or_die(3)

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

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

       which   The which, exactly as to be passed to the setpriority(2) system call.

       who     The who, exactly as to be passed to the setpriority(2) system call.

       prio    The prio, exactly as to be passed to the setpriority(2) system call.

       The explain_setpriority_or_die function is intended to be used in a  fashion  similar  to  the  following
       example:
              explain_setpriority_or_die(which, who, prio);

       explain_setpriority_or_die - set program scheduling priority and report errors

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

       The  explain_setpriority_on_error  function always returns the value return by the wrapped setpriority(2)
       system call.

setpriority(2)
               set program scheduling priority

       explain_setpriority(3)
               explain setpriority(2) errors

       exit(2) terminate the calling process

       #include <libexplain/setpriority.h>
       void explain_setpriority_or_die(int which, int who, int prio);
       int explain_setpriority_on_error(int which, int who, int prio);