tty.c (1558B)
1 /* $OpenBSD: tty.c,v 1.2 2013/11/12 13:54:51 deraadt 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 28 settty(struct termios *t) 29 { 30 int ret; 31 32 while ((ret = tcsetattr(0, TCSADRAIN, t) == -1) && errno == EINTR) 33 continue; 34 return ret; 35 } 36 37 int 38 gettty(struct termios *t) 39 { 40 int ret; 41 42 while ((ret = tcgetattr(0, t) == -1) && errno == EINTR) 43 continue; 44 return ret; 45 } 46 47 /* ARGSUSED */ 48 void 49 tstpcont(int sig) 50 { 51 int save_errno = errno; 52 53 if (sig == SIGTSTP) { 54 signal(SIGCONT, tstpcont); 55 gettty(&ttyedit); 56 settty(&ttysaved); 57 } else { 58 signal(SIGTSTP, tstpcont); 59 settty(&ttyedit); 60 } 61 signal(sig, SIG_DFL); 62 kill(0, sig); 63 errno = save_errno; 64 }