sigsuspend - install a signal mask and suspend caller until
int sigsuspend(const sigset_t *set);
The sigsuspend() function replaces the caller's signal mask
with the set of signals pointed to by the set argument and
suspends the caller until delivery of a signal whose action
is either to execute a signal catching function or to ter-
minate the process.
If the action is to terminate the process, sigsuspend() does
not return. If the action is to execute a signal catching
function, sigsuspend() returns after the signal catching
function returns. On return, the signal mask is restored to
the set that existed before the call to sigsuspend().
It is not possible to block those signals that cannot be
ignored (see signal(3HEAD)); this restriction is silently
imposed by the system.
Since sigsuspend() suspends the caller's execution indefin-
itely, there is no successful completion return value. On
failure, it returns -1 and sets errno to indicate the error.
The sigsuspend() function will fail if:
The set argument points to an illegal address.
EINTR A signal was caught by the caller and control was
returned from the signal catching function.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | Async-Signal-Safe |
sigaction(2), sigprocmask(2), sigwait(2), signal(3C),
signal(3HEAD), sigsetops(3C), attributes (5)
If the caller specifies more than one unblocked signal in
the mask to sigsuspend(), more than one signal might be pro-
cessed before the call to sigsuspend() returns.
While the caller is executing the signal handler that inter-
rupted its call to sigsuspend(), its signal mask is the one
passed to sigsuspend(), modified as usual by the signal mask
specification in the signal's sigaction(2) parameters. The
caller's signal mask is not restored to its previous value
until the caller returns from all the signal handlers that
Man(1) output converted with