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”).