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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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SIGSUSPEND(3P) POSIX Programmer's Manual SIGSUSPEND(3P)
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.
sigsuspend — wait for a signal
#include <signal.h>
int sigsuspend(const sigset_t *sigmask);
The sigsuspend() function shall replace the current signal mask of
the calling thread with the set of signals pointed to by sigmask
and then suspend the thread until delivery of a signal whose
action is either to execute a signal-catching function or to
terminate the process. This shall not cause any other signals that
may have been pending on the process to become pending on the
thread.
If the action is to terminate the process then sigsuspend() shall
never return. If the action is to execute a signal-catching
function, then sigsuspend() shall return after the signal-catching
function returns, with the signal mask restored to the set that
existed prior to the sigsuspend() call.
It is not possible to block signals that cannot be ignored. This
is enforced by the system without causing an error to be
indicated.
Since sigsuspend() suspends thread execution indefinitely, there
is no successful completion return value. If a return occurs, -1
shall be returned and errno set to indicate the error.
The sigsuspend() 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.
None.
Normally, at the beginning of a critical code section, a specified
set of signals is blocked using the sigprocmask() function. When
the thread has completed the critical section and needs to wait
for the previously blocked signal(s), it pauses by calling
sigsuspend() with the mask that was returned by the sigprocmask()
call.
Code which wants to avoid the ambiguity of the signal mask for
thread cancellation handlers can install an additional
cancellation handler which resets the signal mask to the expected
value.
void cleanup(void *arg)
{
sigset_t *ss = (sigset_t *) arg;
pthread_sigmask(SIG_SETMASK, ss, NULL);
}
int call_sigsuspend(const sigset_t *mask)
{
sigset_t oldmask;
int result;
pthread_sigmask(SIG_SETMASK, NULL, &oldmask);
pthread_cleanup_push(cleanup, &oldmask);
result = sigsuspend(sigmask);
pthread_cleanup_pop(0);
return result;
}
None.
Section 2.4, Signal Concepts, pause(3p), sigaction(3p),
sigaddset(3p), sigdelset(3p), sigemptyset(3p), sigfillset(3p)
The Base Definitions volume of POSIX.1‐2017, signal.h(0p)
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 SIGSUSPEND(3P)
Pages that refer to this page: signal.h(0p), pause(3p), pthread_sigmask(3p), sigaction(3p), sigaddset(3p), sigdelset(3p), sigemptyset(3p), sigfillset(3p), sighold(3p), sigismember(3p), siglongjmp(3p), signal(3p), sigsetjmp(3p), sigtimedwait(3p), sigwait(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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