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Annotation of src/usr.bin/bc/tty.c, Revision 1.2

1.2     ! deraadt     1: /*      $OpenBSD: tty.c,v 1.1 2013/09/19 16:12:01 otto Exp $   */
1.1       otto        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:
1.2     ! deraadt    27: static int
1.1       otto       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: }