sigblock

NAME

       sigblock, siggetmask, sigsetmask, sigmask - manipulate the
       signal mask

SYNOPSIS

       #include <signal.h>

       int sigblock(int mask);
       int siggetmask(void);
       int sigsetmask(int mask);
       int sigmask(signum);

DESCRIPTION

       This interface is made obsolete by: sigprocmask(2).

       Sigblock() adds the signals specified in mask to  the  set
       of signals currently being blocked from delivery.

       sigsetmask()  replaces  the set of blocked signals totally
       with a new set specified in mask.

       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  or  SIGSTOP;  this
       restriction is silently imposed by the system.

       The  current  set of blocked signals can be obtained using
       siggetmask().

RETURN VALUES

       Siggetmask() returns the current set of masked signals.

       Sigsetmask() and sigblock() return  the  previous  set  of
       masked signals.

HISTORY

       These  function  calls  appeared  in BSD 4.3 and have been
       deprecated.

SEE ALSO

       kill(2), sigprocmask(2), siggetops(3)