1SIGBLOCK(2)                   System Calls Manual                  SIGBLOCK(2)
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NAME

6       sigblock - block signals
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SYNOPSIS

9       #include <signal.h>
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11       omask = sigblock(mask);
12       long omask, mask;
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14       mask = sigmask(signum)
15       long mask;
16       int signum;
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DESCRIPTION

19       This interface is made obsolete by: sigprocmask(2).
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21       Sigblock causes the signals specified in mask to be added to the set of
22       signals currently being blocked from delivery.  Signals are blocked  if
23       the  corresponding bit in mask is a 1; the macro sigmask is provided to
24       construct the mask for a given signum.
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26       It is not  possible  to  block  SIGKILL,  SIGSTOP,  or  SIGCONT;   this
27       restriction is silently imposed by the system.
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RETURN VALUE

30       The previous set of masked signals is returned.
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SEE ALSO

33       kill(2), sigprocmask(2), sigaction(2), sigsetmask(2), sigsetops(2)
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HISTORY

36       The sigblock function call appeared in 4.2BSD and has been deprecated.
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404.2 Berkeley Distribution      September 2, 1997                   SIGBLOCK(2)
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