NANOSLEEP(2) OpenBSD Programmer's Manual NANOSLEEP(2)NAME
nanosleep - high resolution sleep
SYNOPSIS
#include <time.h>
int
nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
DESCRIPTIONnanosleep() suspends execution of the calling process for the time
specified. An unmasked signal will cause it to terminate the sleep
early, regardless of the SA_RESTART value on the interrupting signal.
RETURN VALUES
If the nanosleep() function returns because the requested time has
elapsed, the value returned will be zero.
If the nanosleep() function returns due to the delivery of a signal, the
value returned will be -1, and the global variable errno will be set to
indicate the interruption. If rmtp is non-null, the timespec structure
it references is updated to contain the unslept amount (the request time
minus the time actually slept).
ERRORS
If any of the following conditions occur, the nanosleep() function shall
return -1 and set errno to the corresponding value.
[EFAULT] Either rqtp or rmtp points to memory that is not a valid
part of the process address space.
[EINTR] nanosleep was interrupted by the delivery of a signal.
[EINVAL] rqtp specified a nanosecond value less than zero or greater
than 1000 million, or a second value less than zero or
greater than 100 million.
[ENOSYS] nanosleep is not supported by this implementation.
SEE ALSOsleep(1), sleep(3)STANDARDS
The nanosleep() function conforms to IEEE Std 1003.1b-1993 (``POSIX'').
OpenBSD 4.9 October 24, 2008 OpenBSD 4.9