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PTHREAD_SIGMASK(3) FreeBSD Library Functions Manual PTHREAD_SIGMASK(3) NAME pthread_sigmask - examine and/or change a thread's signal mask SYNOPSIS #include <signal.h> int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset); DESCRIPTION The pthread_sigmask() function examines and/or changes the calling thread's signal mask. If set is not NULL, it specifies a set of signals to be modified, and how specifies what to set the signal mask to: SIG_BLOCK Union of the current mask and set. SIG_UNBLOCK Intersection of the current mask and the complement of set. SIG_SETMASK set. If oset is not NULL, the previous signal mask is stored in the location pointed to by oset. SIGKILL and SIGSTOP cannot be blocked, and will be silently ignored if included in the signal mask. RETURN VALUES If successful, pthread_sigmask() returns 0. Otherwise, an error is returned. ERRORS pthread_sigmask() will fail if: [EINVAL] how is not one of the defined values. SEE ALSO sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2), pthreads(3), sigaddset(3) STANDARDS pthread_sigmask() conforms to ISO/IEC 9945-1:1996 ("POSIX.1"). FreeBSD 14.1-RELEASE-p8 May 29, 2017 FreeBSD 14.1-RELEASE-p8