PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

       pause — suspend the thread until a signal is received

SYNOPSIS

       #include <unistd.h>

       int pause(void);

DESCRIPTION

       The  pause()  function shall suspend the calling thread until delivery of a signal whose action is either
       to execute a signal-catching function or to terminate the process.

       If the action is to terminate the process, pause() shall not return.

       If the action is to execute a signal-catching function, pause() shall return  after  the  signal-catching
       function returns.

RETURN VALUE

       Since  pause()  suspends  thread  execution  indefinitely  unless  interrupted  by  a signal, there is no
       successful completion return value. A value of −1 shall be returned and errno set to indicate the error.

ERRORS

       The pause() function shall fail if:

       EINTR  A signal is caught by the calling  process  and  control  is  returned  from  the  signal-catching
              function.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       Many  common uses of pause() have timing windows. The scenario involves checking a condition related to a
       signal and, if the signal has not occurred, calling pause().  When the signal occurs  between  the  check
       and  the  call  to  pause(),  the  process  often blocks indefinitely. The sigprocmask() and sigsuspend()
       functions can be used to avoid this type of problem.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       sigsuspend()

       The Base Definitions volume of POSIX.1‐2008, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In  the  event
       of  any  discrepancy between this version and the original IEEE and The Open Group Standard, the original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                         PAUSE(3POSIX)