Clear local screen when ^D is typed.

Use setproctitle to remove arguments from 'ps' output.

MFC after: 3 days

usr.bin/talk/display.c

@@ -85,6 +85,18 @@ display(win, text, size)
 			text++;
 			continue;
 		}
+		if (*text == 004 && win == &my_win) {
+			/* control-D clears the screen */
+			werase(my_win.x_win);
+			getyx(my_win.x_win, my_win.x_line, my_win.x_col);
+			wrefresh(my_win.x_win);
+			werase(his_win.x_win);
+			getyx(his_win.x_win, his_win.x_line, his_win.x_col);
+			wrefresh(his_win.x_win);
+			text++;
+			continue;
+		}
+		
 		/* erase character */
 		if (   *text == win->cerase
 		    || *text == 010     /* BS */

usr.bin/talk/talk.1

@@ -90,10 +90,19 @@ of the message should reply by typing
 It doesn't matter from which machine the recipient replies, as
 long as his login-name is the same.  Once communication is established,
 the two parties may type simultaneously, with their output appearing
-in separate windows.  Typing control-L
+in separate windows.
+Typing control-L
 .Ql ^L
 will cause the screen to
-be reprinted, while your erase, kill, and word kill characters will
+be reprinted.
+Typing control-D
+.Ql ^D
+will clear both parts of your screen to be cleared, while
+the control-D character will be sent to the remote side
+(and just displayed by this
+.Nm
+client).
+Your erase, kill, and word kill characters will
 behave normally.  To exit, just type your interrupt character;
 .Nm
 then moves the cursor to the bottom of the screen and restores the

usr.bin/talk/talk.c

@@ -74,6 +74,7 @@ main(argc, argv)
 	(void) setlocale(LC_CTYPE, "");
 
 	get_names(argc, argv);
+	setproctitle("");
 	check_writeable();
 	init_display();
 	open_ctl();