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

explain_nanosleep_or_die - high‐resolution sleep and report errors

#include <libexplain/nanosleep.h>
void explain_nanosleep_or_die(const struct timespec *req, struct timespec *rem);
 
int explain_nanosleep_on_error(const struct timespec *req, struct timespec *rem);

The explain_nanosleep_or_die function is used to call the nanosleep(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_nanosleep(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_nanosleep_on_error function is used to call the nanosleep(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_nanosleep(3) function, but still returns to the caller.
req
The req, exactly as to be passed to the nanosleep(2) system call.
rem
The rem, exactly as to be passed to the nanosleep(2) system call.

The explain_nanosleep_or_die function only returns on success, see nanosleep(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_nanosleep_on_error function always returns the value return by the wrapped nanosleep(2) system call.

The explain_nanosleep_or_die function is intended to be used in a fashion similar to the following example:
explain_nanosleep_or_die(req, rem);

nanosleep(2)
high‐resolution sleep
explain_nanosleep(3)
explain nanosleep(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2013 Peter Miller

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