Provided by: manpages-dev_5.10-1ubuntu1_all bug

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).

       ┌──────────┬───────────────┬─────────────────────────────┐
       │InterfaceAttributeValue                       │
       ├──────────┼───────────────┼─────────────────────────────┤
       │sleep()   │ 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 5.10 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/.