NAME
nanosleep —
suspend thread execution for an
interval measured in nanoseconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include
<time.h>
int
nanosleep(const struct timespec
*rqtp, struct timespec *rmtp);
DESCRIPTION
The
nanosleep()
function causes the calling thread to sleep for the amount of time specified
in rqtp (the actual time slept may be longer, due to
system latencies and possible limitations in the timer resolution of the
hardware). An unmasked signal will cause nanosleep()
to terminate the sleep early, regardless of the
SA_RESTART value on the interrupting signal.
RETURN VALUES
If nanosleep() returns because the
requested time has elapsed, the value returned will be zero.
If nanosleep() 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
structure it references is updated to contain the unslept amount (the
request time minus the time actually slept).
ERRORS
The nanosleep() call fails if:
- [
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.
SEE ALSO
STANDARDS
The nanosleep() function conforms to
IEEE Std 1003.1b-1993
(“POSIX.1b”).