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Man Pages
explain_setpriority_or_die(3) FreeBSD Library Functions Manual explain_setpriority_or_die(3)

explain_setpriority_or_die - set program scheduling priority and report errors

#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);

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 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.

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);

setpriority(2)
set program scheduling priority
explain_setpriority(3)
explain setpriority(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2013 Peter Miller

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