NAME
nanosleep —
suspend process execution for an
interval measured in nanoseconds
LIBRARY
library “libc”
SYNOPSIS
#include
<time.h>
int
nanosleep(const
struct timespec *rqtp,
struct timespec
*rmtp);
DESCRIPTION
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.
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
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 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 ALSO
STANDARDS
The nanosleep() function conforms to
IEEE Std 1003.1b-1993
(“POSIX.1b”).