1 /* $OpenBSD: tty.c,v 1.1 2013/09/19 16:12:01 otto Exp $ */ 2 3 /* 4 * Copyright (c) 2013, Otto Moerbeek <otto@drijf.net> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <errno.h> 20 #include <signal.h> 21 #include <histedit.h> 22 #include <termios.h> 23 #include "extern.h" 24 25 struct termios ttysaved, ttyedit; 26 27 static int settty(struct termios *); 28 29 static int 30 settty(struct termios *t) 31 { 32 int ret; 33 34 while ((ret = tcsetattr(0, TCSADRAIN, t)) == -1 && errno == EINTR) 35 continue; 36 return ret; 37 } 38 39 int 40 gettty(struct termios *t) 41 { 42 int ret; 43 44 while ((ret = tcgetattr(0, t) == -1) && errno == EINTR) 45 continue; 46 return ret; 47 } 48 49 /* ARGSUSED */ 50 void 51 tstpcont(int sig) 52 { 53 int save_errno = errno; 54 55 if (sig == SIGTSTP) { 56 signal(SIGCONT, tstpcont); 57 gettty(&ttyedit); 58 settty(&ttysaved); 59 } else { 60 signal(SIGTSTP, tstpcont); 61 settty(&ttyedit); 62 } 63 signal(sig, SIG_DFL); 64 kill(0, sig); 65 errno = save_errno; 66 } 67