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(gdb.info)Signaling

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Giving your program a signal
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`signal SIGNAL'
     Resume execution where your program stopped, but immediately give
     it the signal SIGNAL.  SIGNAL can be the name or the number of a
     signal.  For example, on many systems `signal 2' and `signal
     SIGINT' are both ways of sending an interrupt signal.

     Alternatively, if SIGNAL is zero, continue execution without
     giving a signal.  This is useful when your program stopped on
     account of a signal and would ordinary see the signal when resumed
     with the `continue' command; `signal 0' causes it to resume
     without a signal.

     `signal' does not repeat when you press <RET> a second time after
     executing the command.

   Invoking the `signal' command is not the same as invoking the `kill'
utility from the shell.  Sending a signal with `kill' causes GDB to
decide what to do with the signal depending on the signal handling
tables (Note: Signals).  The `signal' command passes the signal
directly to your program.