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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

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       project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
       pages/.