1PAUSE(3P)                  POSIX Programmer's Manual                 PAUSE(3P)
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PROLOG

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

12       pause - suspend the thread until a signal is received
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SYNOPSIS

15       #include <unistd.h>
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17       int pause(void);
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DESCRIPTION

21       The pause() function shall suspend the calling thread until delivery of
22       a  signal  whose action is either to execute a signal-catching function
23       or to terminate the process.
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25       If the action is to terminate the process, pause() shall not return.
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27       If the action is to execute a signal-catching function,  pause()  shall
28       return after the signal-catching function returns.
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RETURN VALUE

31       Since pause() suspends thread execution indefinitely unless interrupted
32       by a signal, there is no successful completion return value. A value of
33       -1 shall be returned and errno set to indicate the error.
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ERRORS

36       The pause() function shall fail if:
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38       EINTR  A  signal  is  caught  by  the  calling  process  and control is
39              returned from the signal-catching function.
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42       The following sections are informative.
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EXAMPLES

45       None.
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APPLICATION USAGE

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

56       None.
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FUTURE DIRECTIONS

59       None.
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SEE ALSO

62       sigsuspend(),  the  Base  Definitions  volume  of IEEE Std 1003.1-2001,
63       <unistd.h>
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66       Portions of this text are reprinted and reproduced in  electronic  form
67       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
68       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
69       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
70       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
71       event of any discrepancy between this version and the original IEEE and
72       The Open Group Standard, the original IEEE and The Open Group  Standard
73       is  the  referee document. The original Standard can be obtained online
74       at http://www.opengroup.org/unix/online.html .
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78IEEE/The Open Group                  2003                            PAUSE(3P)
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