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



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

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.1-2017, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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                  2017                             PAUSE(3)
