NANOSLEEP(2) BSD Programmer's Manual NANOSLEEP(2)NAMEnanosleep - suspend process execution for an interval measured in
nanoseconds
SYNOPSIS
#include <time.h>
int
nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
DESCRIPTIONNanosleep() causes the process to sleep for the specified time. An un-
masked signal will cause it to terminate the sleep early, regardless of
the SA_RESTART value on the interrupting signal.
RETURN VALUES
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).
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 or equal to 1000 million.
[ENOSYS] nanosleep() is not supported by this implementation.
SEE ALSOsigsuspend(2), sleep(3)STANDARDS
The nanosleep() function conforms to IEEE Std1003.1-1988 (``POSIX'').
BSDI BSD/OS April 17, 1997 1