NAME
nanosleep —
high resolution sleep
SYNOPSIS
#include
<time.h>
int
nanosleep(const
struct timespec *rqtp,
struct timespec
*rmtp);
DESCRIPTION
nanosleep()
suspends execution of the calling process for the time specified. An
unmasked 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 -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
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] nanosleepwas 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] nanosleepis not supported by this implementation.
SEE ALSO
STANDARDS
The nanosleep() function conforms to
IEEE Std 1003.1b-1993
(“POSIX.1b”).