fatbase

portable OpenBSD tools
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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 }