SLEEP(3) - man page online | library functions

Sleep for the specified number of seconds.

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

NAME sleep - sleep for the specified number of seconds
SYNOPSIS #include <unistd.h> unsigned int sleep(unsigned int seconds);
DESCRIPTION sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.
RETURN VALUE Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────┬───────────────┬─────────────────────────────┐ │Interface │ Attribute │ Value │ ├──────────┼───────────────┼─────────────────────────────┤ │sleep() │ Thread safety │ MT-Unsafe sig:SIGCHLD/linux │ └──────────┴───────────────┴─────────────────────────────┘
BUGS sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea. Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.
SEE ALSO alarm(2), nanosleep(2), signal(2), signal(7)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at
GNU 2015-08-08 SLEEP(3)
This manual Reference Other manuals
sleep(3) referred by aio(7) | alarm(2) | clock_nanosleep(2) | dacs.exprs(5) | explain(1) | explain(3) | explain_sleep(3) | explain_sleep_or_die(3) | getitimer(2) | Log::Log4perl::Appender::Limit(3pm) | nanosleep(2) | nanosleep(2freebsd) | Net::Ping(3perl) | perlfaq5(1) | pth(3) | SDL::Mouse(3pm) | signal(7) | sleep(1) | sleep(1plan9) | stress-ng(1)
refer to alarm(2) | attributes(7) | longjmp(3) | nanosleep(2) | signal(2) | signal(7)