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sigsuspend() - Unix, Linux System Call
sigsuspend - wait for a signal
int sigsuspend(const sigset_t *mask);
sigsuspend() temporarily replaces the signal mask of the calling process with the
mask given by
mask and then suspends the process until delivery of a signal whose
action is to invoke a signal handler or to terminate a process.
If the signal terminates the process, then
sigsuspend() does not return.
If the signal is caught, then
sigsuspend() returns after the signal handler returns,
and the signal mask is restored to the state before the call to
It is not possible to block SIGKILL or SIGSTOP;
specifying these signals in
mask, has no effect on the processs signal mask.
sigsuspend() always returns -1, normally with the error
mask points to memory which is not a valid part of the process address space.
The call was interrupted by a signal.
sigsuspend() is used in conjunction with
sigprocmask() in order to prevent delivery of a signal during the execution of a
critical code section.
The caller first blocks the signals with
sigprocmask(). When the critical code has completed, the caller then waits for the
signals by calling
sigsuspend() with the signal mask that was returned by
sigprocmask() (in the
for details on manipulating signal sets.