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sleep(3)

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



NAME
       sleep - sleep for a specified number of seconds

SYNOPSIS
       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION
       sleep()  causes  the calling thread to sleep either until the number of
       real-time seconds specified in seconds have elapsed or until  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).

       allbox;  lb  lb  lbw27  l  l  l.   Interface Attribute Value T{ sleep()
       T}   Thread safety MT-Unsafe sig:SIGCHLD/linux


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

NOTES
       On  Linux,  sleep()  is  implemented   via   nanosleep(2).    See   the
       nanosleep(2) man page for a discussion of the clock used.

   Portability notes
       On  some systems, sleep() may be implemented using alarm(2) and SIGALRM
       (POSIX.1 permits this); 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
       sleep(1), alarm(2), nanosleep(2), signal(2), signal(7)

COLOPHON
       This page is part of release 5.02 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
       https://www.kernel.org/doc/man-pages/.



GNU                               2017-09-15                          SLEEP(3)
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