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Annotation of src/usr.bin/ssh/sshtty.c, Revision 1.1

1.1     ! stevesk     1: /* $OpenBSD$ */
        !             2: /*
        !             3:  * Author: Tatu Ylonen <ylo@cs.hut.fi>
        !             4:  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
        !             5:  *                    All rights reserved
        !             6:  *
        !             7:  * As far as I am concerned, the code I have written for this software
        !             8:  * can be used freely for any purpose.  Any derived versions of this
        !             9:  * software must be clearly marked as such, and if the derived work is
        !            10:  * incompatible with the protocol description in the RFC file, it must be
        !            11:  * called by a name other than "ssh" or "Secure Shell".
        !            12:  */
        !            13: /*
        !            14:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
        !            15:  * Copyright (c) 2001 Kevin Steves.  All rights reserved.
        !            16:  *
        !            17:  * Redistribution and use in source and binary forms, with or without
        !            18:  * modification, are permitted provided that the following conditions
        !            19:  * are met:
        !            20:  * 1. Redistributions of source code must retain the above copyright
        !            21:  *    notice, this list of conditions and the following disclaimer.
        !            22:  * 2. Redistributions in binary form must reproduce the above copyright
        !            23:  *    notice, this list of conditions and the following disclaimer in the
        !            24:  *    documentation and/or other materials provided with the distribution.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            27:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            28:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            29:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            30:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            31:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            32:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            33:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            35:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            36:  */
        !            37:
        !            38: #include "includes.h"
        !            39:
        !            40: #include "sshtty.h"
        !            41: #include "log.h"
        !            42:
        !            43: static struct termios _saved_tio;
        !            44: static int _in_raw_mode = 0;
        !            45:
        !            46: int
        !            47: in_raw_mode(void)
        !            48: {
        !            49:        return _in_raw_mode;
        !            50: }
        !            51:
        !            52: struct termios
        !            53: get_saved_tio(void)
        !            54: {
        !            55:        return _saved_tio;
        !            56: }
        !            57:
        !            58: void
        !            59: leave_raw_mode(void)
        !            60: {
        !            61:        if (!_in_raw_mode)
        !            62:                return;
        !            63:        if (tcsetattr(fileno(stdin), TCSADRAIN, &_saved_tio) == -1)
        !            64:                perror("tcsetattr");
        !            65:        else
        !            66:                _in_raw_mode = 0;
        !            67:
        !            68:        fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
        !            69: }
        !            70:
        !            71: void
        !            72: enter_raw_mode(void)
        !            73: {
        !            74:        struct termios tio;
        !            75:
        !            76:        if (tcgetattr(fileno(stdin), &tio) == -1) {
        !            77:                perror("tcgetattr");
        !            78:                return;
        !            79:        }
        !            80:        _saved_tio = tio;
        !            81:        tio.c_iflag |= IGNPAR;
        !            82:        tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
        !            83:        tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
        !            84: #ifdef IEXTEN
        !            85:        tio.c_lflag &= ~IEXTEN;
        !            86: #endif
        !            87:        tio.c_oflag &= ~OPOST;
        !            88:        tio.c_cc[VMIN] = 1;
        !            89:        tio.c_cc[VTIME] = 0;
        !            90:        if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) == -1)
        !            91:                perror("tcsetattr");
        !            92:        else
        !            93:                _in_raw_mode = 1;
        !            94:
        !            95:        fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
        !            96: }