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PAUSE(3P)                  POSIX Programmer's Manual                 PAUSE(3P)
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 Electri-
       cal  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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                            PAUSE(3P)