osf1 man page for usleep

usleep(3)						     Library Functions Manual							 usleep(3)

NAME
       usleep -  Suspends execution for an interval of time

LIBRARY
       Standard C Library (libc.so, libc.a)

SYNOPSIS
       #include <unistd.h>

	int usleep(
	       useconds_t useconds);

       The following function declaration does not conform to current standards and is supported only for backward compatibility:

       #include <unistd.h>

       void usleep(
	       unsigned useconds);

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       usleep():  XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS
       Specifies the number of microseconds to sleep.

DESCRIPTION
       The  usleep()  function	suspends  the  current	process from execution for the number of microseconds specified by the useconds parameter.
       Because of other activity in the system, or because of the time spent in processing the call, the actual suspension time  might	be  longer
       than specified.

       The useconds parameter must be less than 1,000,000.  If the value of useconds is 0 (zero), the usleep() function has no effect.

       In a multithreaded environment, the sleep() function is redefined to suspend the calling thread.

RETURN VALUES
       On successful completion, the usleep() function returns 0 (zero).  Otherwise, it returns -1 and sets errno to indicate the error.

ERRORS
       The  usleep()  function	sets  errno to the specified values for the following conditions: The interval specified in the useconds parameter
       exceeds 1,000,000 microseconds.

RELATED INFORMATION
       Functions: getitimer(2), sigaction(2), sigvec(2), alarm(3), sleep(3)

       Standards: standards(5) delim off

																	 usleep(3)