explain_getpriority_or_die - get program scheduling priority and report errors

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                                   explain_getpriority_or_die(3)

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

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

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

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

       The explain_getpriority_or_die function is intended to be used in a  fashion  similar  to  the  following
       example:
              int result = explain_getpriority_or_die(which, who);

       explain_getpriority_or_die - get program scheduling priority and report errors

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

       The  explain_getpriority_on_error  function always returns the value return by the wrapped getpriority(2)
       system call.

getpriority(2)
               get program scheduling priority

       explain_getpriority(3)
               explain getpriority(2) errors

       exit(2) terminate the calling process

       #include <libexplain/getpriority.h>
       int explain_getpriority_or_die(int which, int who);
       int explain_getpriority_on_error(int which, int who);