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

   sleep(1), alarm(2), nanosleep(2), signal(2), signal(7)

COLOPHON

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   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/.

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