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

explain_sleep_or_die - Sleep for a number of seconds and report errors

#include <libexplain/sleep.h>
unsigned int explain_sleep_or_die(unsigned int seconds);
 
unsigned int explain_sleep_on_error(unsigned int seconds);

The explain_sleep_or_die function is used to call the sleep(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sleep(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_sleep_on_error function is used to call the sleep(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sleep(3) function, but still returns to the caller.
seconds
The seconds, exactly as to be passed to the sleep(3) system call.

The explain_sleep_or_die function only returns on success, see sleep(3) for more information. On failure, prints an explanation and exits, it does not return.
The explain_sleep_on_error function always returns the value return by the wrapped sleep(3) system call.

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

sleep(3)
Sleep for the specified number of seconds
explain_sleep(3)
explain sleep(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2013 Peter Miller

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