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), sigsetops(3)

STANDARDS
pthread_sigmask() conforms to p1003.1-96.