usleep(3)
- NetBSD Manual Pages
USLEEP(3) NetBSD Library Functions Manual USLEEP(3)
NAME
usleep -- suspend execution for interval of microseconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
usleep(useconds_t microseconds);
DESCRIPTION
The usleep() function suspends execution of the calling process until
either the number of microseconds specified by microseconds have elapsed
or a signal is delivered to the calling process and its action is to
invoke a signal catching function or to terminate the process. The sus-
pension time may be longer than requested due to the scheduling of other
activity by the system.
The microseconds argument must be less than 1,000,000. If the value of
microseconds is 0, then the call has no effect.
RETURN VALUES
On successful completion, usleep() returns 0. Otherwise, it returns -1
and sets errno to indicate the error.
ERRORS
The usleep() function may fail if:
[EINVAL] The microseconds interval specified 1,000,000 or more
microseconds.
SEE ALSO
nanosleep(2), sleep(3)
STANDARDS
The usleep() function conforms to X/Open Portability Guide Issue 4,
Version 2 (``XPG4.2'').
HISTORY
The usleep() function appeared in 4.3BSD.
NetBSD 5.0.1 June 4, 1993 NetBSD 5.0.1
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