NANOSLEEP(2) BSD System Calls Manual NANOSLEEP(2)
nanosleep -- suspend process execution for an interval measured in
Standard C Library (libc, -lc)
nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
Nanosleep() causes the process to sleep for the specified time. 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 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 struc-
ture it references is updated to contain the unslept amount (the request
time minus the time actually slept).
The nanosleep() call fails if:
[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 sig-
[EINVAL] rqtp specified a nanosecond value less than zero or
greater than or equal to 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