sleep

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 |
       +----------+---------------+-----------------------------+

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

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
       http://www.kernel.org/doc/man-pages/.

GNU                               2015-08-08                          SLEEP(3)
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