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Annotation of embedaddon/ntp/lib/isc/unix/keyboard.c, revision 1.1.1.1

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: }