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.Dd February 19, 2011 .Dt PTHREAD_SIGMASK 3 .Os .Sh NAME .Nm pthread_sigmask .Nd examine and/or change a thread's signal mask .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS n pthread.h n signal.h .Ft int .Fn pthread_sigmask "int how" "const sigset_t * restrict set" \ "sigset_t * restrict oset" .Sh DESCRIPTION The .Fn pthread_sigmask function examines and/or changes the calling thread's signal mask.
p If .Fa set is not .Dv NULL , it specifies a set of signals to be modified, and .Fa how specifies what to set the signal mask to: l -tag -width SIG_UNBLOCK t Dv SIG_BLOCK Union of the current mask and .Fa set . t Dv SIG_UNBLOCK Intersection of the current mask and the complement of .Fa set . t Dv SIG_SETMASK .Fa set . .El
p If .Fa oset is not NULL, the previous signal mask is stored in the location pointed to by .Fa oset .
p .Dv SIGKILL and .Dv SIGSTOP cannot be blocked, and will be silently ignored if included in the signal mask. .Sh RETURN VALUES If successful, .Fn pthread_sigmask returns 0. Otherwise, an error is returned. .Sh ERRORS The .Fn pthread_sigmask function will fail if: l -tag -width Er t Bq Er EINVAL .Fa how is not one of the defined values. .El .Sh SEE ALSO .Xr sigaction 2 , .Xr sigpending 2 , .Xr sigprocmask 2 , .Xr sigsuspend 2 , .Xr sigsetops 3 .Sh STANDARDS The .Fn pthread_sigmask function conforms to .St -p1003.1-96