1 /* $FreeBSD$ */ 2 /* $OpenBSD: tty.c,v 1.3 2015/09/05 09:49:24 jsg Exp $ */ 3 4 /* 5 * Copyright (c) 2013, Otto Moerbeek <otto@drijf.net> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <errno.h> 21 #include <signal.h> 22 #include <histedit.h> 23 #include <termios.h> 24 #include "extern.h" 25 26 struct termios ttysaved, ttyedit; 27 28 static int 29 settty(struct termios *t) 30 { 31 int ret; 32 33 while ((ret = tcsetattr(0, TCSADRAIN, t)) == -1 && errno == EINTR) 34 continue; 35 return ret; 36 } 37 38 int 39 gettty(struct termios *t) 40 { 41 int ret; 42 43 while ((ret = tcgetattr(0, t)) == -1 && errno == EINTR) 44 continue; 45 return ret; 46 } 47 48 /* ARGSUSED */ 49 void 50 tstpcont(int sig) 51 { 52 int save_errno = errno; 53 54 if (sig == SIGTSTP) { 55 signal(SIGCONT, tstpcont); 56 gettty(&ttyedit); 57 settty(&ttysaved); 58 } else { 59 signal(SIGTSTP, tstpcont); 60 settty(&ttyedit); 61 } 62 signal(sig, SIG_DFL); 63 kill(0, sig); 64 errno = save_errno; 65 } 66