|SIGPROCMASK(2)||System Calls Manual||SIGPROCMASK(2)|
LIBRARY¶Standard C Library (libc, -lc)
const sigset_t * restrict set,
sigset_t * restrict oset);
sigprocmask() system call examines and/or changes the current signal mask (those signals that are blocked from delivery). Signals are blocked if they are members of the current signal mask set.
If set is not null, the action of
sigprocmask() depends on the value of the
how argument. The signal mask is changed as a function
of the specified set and the current mask. The
function is specified by how using one of the
following values from
- The new mask is the union of the current mask and the specified set.
- The new mask is the intersection of the current mask and the complement of the specified set.
- The current mask is replaced by the specified set.
If oset is not null, it is set to the previous value of the signal mask. When set is null, the value of how is insignificant and the mask remains unset providing a way to examine the signal mask without modification.
The system quietly disallows
SIGSTOP to be blocked.
In threaded applications, pthread_sigmask(3)
must be used instead of
sigprocmask() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
sigprocmask() system call will fail and the signal mask will be unchanged if one of the following occurs:
- The how argument has a value other than those listed here.
SEE ALSO¶kill(2), sigaction(2), sigpending(2), sigsuspend(2), fpsetmask(3), pthread_sigmask(3), sigsetops(3)
sigprocmask() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).
|May 7, 2010||Linux 4.9.0-9-amd64|