nanosleep - high resolution sleep
Standard C Library (libc, -lc)
nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
The nanosleep() suspends execution of the calling process until either
the number of seconds and nanoseconds specified by rqtp have elapsed or a
signal is delivered to the calling process and its action is to invoke a
signal catching function or to terminate the process. The suspension
time may be longer than requested due to the scheduling of other activity
by the system.
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 the -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).
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.
[ENOSYS] nanosleep is not supported by this implementation.
The nanosleep() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1'').
BSD April 17, 1997 BSD
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