(libc.info.gz) Blocking Signals

(libc.info.gz) Waiting for a Signal

 
 24.7 Blocking Signals
 =====================
 
 Blocking a signal means telling the operating system to hold it and
 deliver it later.  Generally, a program does not block signals
 indefinitely--it might as well ignore them by setting their actions to
 `SIG_IGN'.  But it is useful to block signals briefly, to prevent them
 from interrupting sensitive operations.  For instance:
 
    * You can use the `sigprocmask' function to block signals while you
      modify global variables that are also modified by the handlers for
      these signals.
 
    * You can set `sa_mask' in your `sigaction' call to block certain
      signals while a particular signal handler runs.  This way, the
      signal handler can run without being interrupted itself by signals.

 
* Why Block                           The purpose of blocking signals.
* Signal Sets                         How to specify which signals to
                                          block.
* Process Signal Mask                 Blocking delivery of signals to your
 				         process during normal execution.
* Testing for Delivery                Blocking to Test for Delivery of
                                          a Signal.
* Blocking for Handler                Blocking additional signals while a
 				         handler is being run.
* Checking for Pending Signals        Checking for Pending Signals
* Remembering a Signal                How you can get almost the same
                                          effect as blocking a signal, by
                                          handling it and setting a flag
                                          to be tested later.

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