usleep
- suspend process execution for an interval measured in microseconds
LIBRARY
Lb libc
SYNOPSIS
#include <unistd.h> int
usleep (useconds_t microseconds);
DESCRIPTION
The
usleep ();
function suspends execution of the calling process until either
Fa microseconds
microseconds have elapsed or a signal is delivered to the process and its
action is to invoke a signal-catching function or to terminate the
process.
System activity may lengthen the sleep by an indeterminate amount.
This function is implemented using
nanosleep(2)
by pausing for
Fa microseconds
microseconds or until a signal occurs.
Consequently, in this implementation,
sleeping has no effect on the state of process timers,
and there is no special handling for SIGALRM.
RETURN VALUES
Rv -std usleep
ERRORS
The
usleep ();
function
will fail if:
Bq Er EINTR
A signal was delivered to the process and its
action was to invoke a signal-catching function.
