PAUSE(P) POSIX Programmer's Manual PAUSE(P)
pause - suspend the thread until a signal is received
The pause() function shall suspend the calling thread until delivery of a signal whose action is either to execute a signal-catching func-
tion 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 error.
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.
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.
sigsuspend() , the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .
IEEE/The Open Group 2003 PAUSE(P)