pause

PAUSE(3POSIX)               POSIX Programmer's Manual              PAUSE(3POSIX)



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)