DragonFly On-Line Manual Pages

NANOSLEEP(2)		 DragonFly System Calls Manual		  NANOSLEEP(2)


nanosleep -- suspend process execution for an interval measured in nanoseconds


Standard C Library (libc, -lc)


#include <time.h> int 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 -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).


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- nal. [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.


sigsuspend(2), sleep(3)


The nanosleep() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1''). DragonFly 4.1 April 17, 1997 DragonFly 4.1