sigblock(2) [osx man page]

SIGBLOCK(2)						      BSD System Calls Manual						       SIGBLOCK(2)

NAME

     sigblock -- block signals

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     int
     sigblock(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.  Signals are blocked if the corre-
     sponding 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.

RETURN VALUES

     The previous set of masked signals is returned.

SEE ALSO

     kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3)

HISTORY

     The sigblock() function call appeared in 4.2BSD and has been deprecated.

BSD
								   June 2, 1993 							       BSD

SIGSETMASK(2)						      BSD System Calls Manual						     SIGSETMASK(2)

NAME

     sigsetmask, sigblock -- manipulate current signal mask

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     int
     sigsetmask(int mask);

     int
     sigblock(int mask);

     int
     sigmask(int signum);

DESCRIPTION

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

     The sigsetmask() function sets the current signal mask to the specified mask.  Signals are blocked from delivery if the corresponding bit in
     mask is a 1.  The sigblock() function adds the signals in the specified mask to the current signal mask, rather than overwriting it as
     sigsetmask() does.  The macro sigmask() is provided to construct the mask for a given signum.

     The system quietly disallows SIGKILL or SIGSTOP to be blocked.

RETURN VALUES

     The sigblock() and sigsetmask() functions return the previous set of masked signals.

SEE ALSO

     kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3)

HISTORY

     The sigsetmask() and sigblock() functions first appeared in 4.2BSD and have been deprecated.

BSD
								   June 2, 1993 							       BSD