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Annotation of embedaddon/ntp/lib/isc/unix/keyboard.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
        !             3:  * Copyright (C) 2000, 2001  Internet Software Consortium.
        !             4:  *
        !             5:  * Permission to use, copy, modify, and/or distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
        !            10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
        !            11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
        !            12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
        !            14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
        !            15:  * PERFORMANCE OF THIS SOFTWARE.
        !            16:  */
        !            17: 
        !            18: /* $Id: keyboard.c,v 1.13 2007/06/19 23:47:18 tbox Exp $ */
        !            19: 
        !            20: #include <config.h>
        !            21: 
        !            22: #include <sys/param.h>
        !            23: #include <sys/types.h>
        !            24: #include <sys/time.h>
        !            25: #include <sys/uio.h>
        !            26: 
        !            27: #include <errno.h>
        !            28: #include <stdlib.h>
        !            29: #include <string.h>
        !            30: #include <termios.h>
        !            31: #include <unistd.h>
        !            32: #include <fcntl.h>
        !            33: 
        !            34: #include <isc/keyboard.h>
        !            35: #include <isc/util.h>
        !            36: 
        !            37: isc_result_t
        !            38: isc_keyboard_open(isc_keyboard_t *keyboard) {
        !            39:        int fd;
        !            40:        isc_result_t ret;
        !            41:        struct termios current_mode;
        !            42: 
        !            43:        REQUIRE(keyboard != NULL);
        !            44: 
        !            45:        fd = open("/dev/tty", O_RDONLY, 0);
        !            46:        if (fd < 0)
        !            47:                return (ISC_R_IOERROR);
        !            48: 
        !            49:        keyboard->fd = fd;
        !            50: 
        !            51:        if (tcgetattr(fd, &keyboard->saved_mode) < 0) {
        !            52:                ret = ISC_R_IOERROR;
        !            53:                goto errout;
        !            54:        }
        !            55: 
        !            56:        current_mode = keyboard->saved_mode;
        !            57: 
        !            58:        current_mode.c_iflag &=
        !            59:                        ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
        !            60:        current_mode.c_oflag &= ~OPOST;
        !            61:        current_mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
        !            62:        current_mode.c_cflag &= ~(CSIZE|PARENB);
        !            63:        current_mode.c_cflag |= CS8;
        !            64: 
        !            65:        current_mode.c_cc[VMIN] = 1;
        !            66:        current_mode.c_cc[VTIME] = 0;
        !            67:        if (tcsetattr(fd, TCSAFLUSH, &current_mode) < 0) {
        !            68:                ret = ISC_R_IOERROR;
        !            69:                goto errout;
        !            70:        }
        !            71: 
        !            72:        keyboard->result = ISC_R_SUCCESS;
        !            73: 
        !            74:        return (ISC_R_SUCCESS);
        !            75: 
        !            76:  errout:
        !            77:        close (fd);
        !            78: 
        !            79:        return (ret);
        !            80: }
        !            81: 
        !            82: isc_result_t
        !            83: isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleeptime) {
        !            84:        REQUIRE(keyboard != NULL);
        !            85: 
        !            86:        if (sleeptime > 0 && keyboard->result != ISC_R_CANCELED)
        !            87:                (void)sleep(sleeptime);
        !            88: 
        !            89:        (void)tcsetattr(keyboard->fd, TCSAFLUSH, &keyboard->saved_mode);
        !            90:        (void)close(keyboard->fd);
        !            91: 
        !            92:        keyboard->fd = -1;
        !            93: 
        !            94:        return (ISC_R_SUCCESS);
        !            95: }
        !            96: 
        !            97: isc_result_t
        !            98: isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp) {
        !            99:        ssize_t cc;
        !           100:        unsigned char c;
        !           101:        cc_t *controlchars;
        !           102: 
        !           103:        REQUIRE(keyboard != NULL);
        !           104:        REQUIRE(cp != NULL);
        !           105: 
        !           106:        cc = read(keyboard->fd, &c, 1);
        !           107:        if (cc < 0) {
        !           108:                keyboard->result = ISC_R_IOERROR;
        !           109:                return (keyboard->result);
        !           110:        }
        !           111: 
        !           112:        controlchars = keyboard->saved_mode.c_cc;
        !           113:        if (c == controlchars[VINTR] || c == controlchars[VQUIT]) {
        !           114:                keyboard->result = ISC_R_CANCELED;
        !           115:                return (keyboard->result);
        !           116:        }
        !           117: 
        !           118:        *cp = c;
        !           119: 
        !           120:        return (ISC_R_SUCCESS);
        !           121: }
        !           122: 
        !           123: isc_boolean_t
        !           124: isc_keyboard_canceled(isc_keyboard_t *keyboard) {
        !           125:        return (ISC_TF(keyboard->result == ISC_R_CANCELED));
        !           126: }