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.
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.
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
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.
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
IEEE/The Open Group 2013 PAUSE(3P)