SIGBLOCK(2)                          BSD                           SIGBLOCK(2)



NAME
     sigblock - block signals

SYNOPSIS
     #include <signal.h>

     sigblock(mask);
     int mask;

     mask = sigmask(signum)

DESCRIPTION
     sigblock causes the signals specified in mask to be added to the set of
     signals currently being blocked from delivery.  Signals are blocked if
     the corresponding bit in mask is a 1; the macro sigmask is provided to
     construct the mask for a given signum.

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

SEE ALSO
     kill(2), sigvec(2), sigsetmask(2)

DIAGNOSTICS
     The previous set of masked signals is returned.