]]> ]]> Signal special file Signal send a (POSIX-style) signal to a tool Signal(in string theSignal); The Signal request asks the handling procid to send itself the indicated POSIX signal. The theSignal argument is the signal to send. The &cdeman.ttdt.session.join;, function can be used to register for, and transparently process, the Signal request. The Signal request can be sent as in the following example: Tt_message msg = tttk_message_create(0, TT_REQUEST, TT_SESSION, the_recipient_procid, TTDT_SIGNAL, my_callback); tt_message_arg_add(msg, TT_IN, Tttk_string, "SIGHUP"); tt_message_send(msg); Signal can also be sent as a multicast notice, as an edict to all tools in the scope of the message. The consequences of doing so can be severe and unexpected. ]]> sigaction(2) &cdeman.tt.message.arg.add;, &cdeman.tt.message.send;, &cdeman.ttdt.session.join;.