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.

CONFORMING TO¶

POSIX.1-2001.

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 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.