RETURN VALUES
If the nanosleep system call returns because the requested time has elapsed, the value returned will be zero. If the nanosleep system call 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
The nanosleep system call fails if:
