Manual Pages  — PTHREAD_SIGMASK

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

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO STANDARDS

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:

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.

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

The pthread_sigmask() function will fail if:

[EINVAL]
	how is not one of the defined values.

The pthread_sigmask() function conforms to IEEE Std 1003.1-96 ("POSIX.1")