usleep(1) [centos man page]

USLEEP(1)						      General Commands Manual							 USLEEP(1)

NAME

       usleep - sleep some number of microseconds

SYNOPSIS

       usleep [number]

DESCRIPTION

       usleep sleeps some number of microseconds.  The default is 1.

OPTIONS

       --usage Show short usage message.

       --help, -?
	      Print help information.

       -v, --version
	      Print version information.

BUGS

       Probably not accurate on many machines down to the microsecond.	Count on precision only to -4 or maybe -5.

AUTHOR

       Donald Barnes <djb@redhat.com>
       Erik Troan <ewt@redhat.com>

								   Red Hat, Inc 							 USLEEP(1)

USLEEP(3)						     Linux Programmer's Manual							 USLEEP(3)

NAME

       usleep - suspend execution for microsecond intervals

SYNOPSIS

       #include <unistd.h>

       void usleep(unsigned long usec);
       int usleep(unsigned long usec); /* SUSv2 */

DESCRIPTION

       The  usleep() function suspends execution of the calling process for usec microseconds.	The sleep may be lengthened slightly by any system
       activity or by the time spent processing the call.

RETURN VALUE

       None (BSD). Or: 0 on success, -1 on error (SUSv2).

ERRORS

       EINTR  Interrupted by a signal.

       EINVAL usec is not smaller than 1000000.  (On systems where that is considered an error.)

CONFORMING TO

       BSD 4.3.  The SUSv2 version returns int, and this is also the prototype used by glibc 2.2.2.  Only the EINVAL error return is documented by
       SUSv2.

NOTES

       The  interaction of this function with SIGALRM and other timer functions such as sleep(), alarm(), setitimer(), nanosleep() is unspecified.
       This function is obsolete. Use nanosleep(2) or setitimer(2) instead.

SEE ALSO

       alarm(2), getitimer(2), nanosleep(2), select(2), setitimer(2), sleep(3)

								    2001-04-02								 USLEEP(3)