NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     #include <pthread.h>
     #include <signal.h>

     int
     pthread_sigmask(int   how,  const  sigset_t  *set,  sigset_t
*oset);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

     pthread_sigmask() will fail if:

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

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     pthread_sigmask()    conforms    to    ISO/IEC   9945-1:1996
(``POSIX'').

OpenBSD     3.6                          March      21,      1999