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(librep.info)Signalling Processes

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Signalling Processes
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 - Function: interrupt-process process-object #!optional whole-group
     Sends the `SIGINT' signal to PROCESS-OBJECT.

 - Function: kill-process process-object #!optional whole-group
     Sends the `SIGKILL' signal to the PROCESS-OBJECT.

   Note that the functions `stop-process' and `continue-process' also
send signals to the subprocess.

 - Function: signal-process process signal #!optional whole-group
     Send the signal SIGNAL to the process PROCESS; if WHOLE-GROUP is
     true the signal is also sent to all processes in the process group
     of PROCESS.

     PROCESS may be either a Lisp process object, or an integer
     defining the pid of the process to signal (not necessarily started
     by `librep').

     SIGNAL may either be an integer defining the actual signal number,
     or a symbol naming the signal. All names are as usual but with the
     preceding `SIG' removed, for example the `SIGINT' signal would be
     sent by using the symbol `INT'. If a named signal doesn't exist on
     the current operating system, an error is raised.

     Returns true if the signal was sent successfully.

   As with the UNIX `kill' system call, `signal-process' may also be
used to test whether a process with a particular pid is currently
active, by using a signal with value zero.