NAME

sigblock − block signals

SYNOPSIS

oldmask = sigblock(mask);
int mask;

DESCRIPTION

Sigblock causes the signals specified in mask to be added to the set of signals currently being blocked from delivery.  Signal i is blocked if the i-th bit in mask is a 1.  The previous mask is returned, and may be restored using sigsetmask(2).

It is not possible to block SIGKILL, SIGSTOP, or SIGCONT;  this restriction is silently imposed by the system. 

RETURN VALUE

The previous set of masked signals is returned. 

SEE ALSO

kill(2), sigvec(2), sigsetmask(2),

Sun System Release 1.0  —  29 August 1983