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Man Pages
PTHREAD_SIGMASK(3) FreeBSD Library Functions Manual PTHREAD_SIGMASK(3)

pthread_sigmask
examine and/or change a thread's signal mask

POSIX Threads Library (libpthread, -lpthread)

#include <pthread.h>
#include <signal.h>
int
pthread_sigmask(int how, const sigset_t * restrict set, sigset_t * restrict oset);

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:
Union of the current mask and set.
Intersection of the current mask and the complement of set.
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.

If successful, pthread_sigmask() returns 0. Otherwise, an error is returned.

The pthread_sigmask() function will fail if:
[]
how is not one of the defined values.

sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2), sigsetops(3)

The pthread_sigmask() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”)
February 19, 2011 FreeBSD 12.0-RELEASE

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