nanosleep - high resolution sleep
nanosleep(const struct timespec *rqtp, struct timespec
nanosleep() 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.
If the nanosleep() function returns because the requested
elapsed, the value returned will be zero.
If the nanosleep() function returns due to the delivery of a
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
minus the time actually slept).
If any of the following conditions occur, the nanosleep()
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
[EINVAL] rqtp specified a nanosecond value less than
zero or greater
than 1000 million, or a second value less than
greater than 100 million.
[ENOSYS] nanosleep is not supported by this implementation.
The nanosleep() function conforms to IEEE Std 1003.1b-1993
OpenBSD 3.6 April 17, 1997
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