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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 deliv-ery. delivery.
     ery.  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.

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

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