NANOSLEEP(2) BSD Programmer's Manual NANOSLEEP(2)
nanosleep - high resolution sleep
#include <time.h> int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
nanosleep() suspends execution of the calling process for the time speci- fied. An unmasked signal will cause it to terminate the sleep early, re- gardless 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 -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, or a second value less than zero or greater than 100 million. [ENOSYS] nanosleep is not supported by this implementation.
The nanosleep() function conforms to IEEE Std 1003.1b-1993 ("POSIX"). MirOS BSD #10-current April 17, 1997 1
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