Linux 2.6 - man page for pause (linux section 3posix)
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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 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 error.
The pause() function shall fail if:
EINTR A signal is caught by the calling process and control is returned from the signal-
The following sections are informative.
Many common uses of pause() have timing windows. The scenario involves checking a condi-
tion 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 indefi-
nitely. The sigprocmask() and sigsuspend() functions can be used to avoid this type of
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 Technology -- 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 PAUSE(P)
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