/usr.bin/talk/io.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 177 lines · 108 code · 15 blank · 54 comment · 26 complexity · 56677e2eb56eef5713c7354fcc5f1950 MD5 · raw file
- /*
- * Copyright (c) 1983, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #ifndef lint
- static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
- #endif
- /*
- * This file contains the I/O handling and the exchange of
- * edit characters. This connection itself is established in
- * ctl.c
- */
- #include <sys/filio.h>
- #include <errno.h>
- #include <signal.h>
- #include <netdb.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include "talk.h"
- #include "talk_ctl.h"
- #define A_LONG_TIME 10000000
- volatile sig_atomic_t gotwinch = 0;
- /*
- * The routine to do the actual talking
- */
- void
- talk(void)
- {
- struct hostent *hp, *hp2;
- int nb;
- fd_set read_set, read_template;
- char buf[BUFSIZ], **addr, *his_machine_name;
- struct timeval wait;
- his_machine_name = NULL;
- hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
- sizeof(his_machine_addr.s_addr), AF_INET);
- if (hp != NULL) {
- hp2 = gethostbyname(hp->h_name);
- if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
- hp2->h_length == sizeof(his_machine_addr))
- for (addr = hp2->h_addr_list; *addr != NULL; addr++)
- if (memcmp(*addr, &his_machine_addr,
- sizeof(his_machine_addr)) == 0) {
- his_machine_name = strdup(hp->h_name);
- break;
- }
- }
- if (his_machine_name == NULL)
- his_machine_name = strdup(inet_ntoa(his_machine_addr));
- snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
- msg.r_name, his_machine_name);
- free(his_machine_name);
- message(buf);
- write(STDOUT_FILENO, "\007\007\007", 3);
-
- current_line = 0;
- /*
- * Wait on both the other process (sockt_mask) and
- * standard input ( STDIN_MASK )
- */
- FD_ZERO(&read_template);
- FD_SET(sockt, &read_template);
- FD_SET(fileno(stdin), &read_template);
- for (;;) {
- read_set = read_template;
- wait.tv_sec = A_LONG_TIME;
- wait.tv_usec = 0;
- nb = select(32, &read_set, 0, 0, &wait);
- if (gotwinch) {
- resize_display();
- gotwinch = 0;
- }
- if (nb <= 0) {
- if (errno == EINTR) {
- read_set = read_template;
- continue;
- }
- /* panic, we don't know what happened */
- p_error("Unexpected error from select");
- quit();
- }
- if (FD_ISSET(sockt, &read_set)) {
- /* There is data on sockt */
- nb = read(sockt, buf, sizeof buf);
- if (nb <= 0) {
- message("Connection closed. Exiting");
- quit();
- }
- display(&his_win, buf, nb);
- }
- if (FD_ISSET(fileno(stdin), &read_set)) {
- /*
- * We can't make the tty non_blocking, because
- * curses's output routines would screw up
- */
- int i;
- ioctl(0, FIONREAD, (void *) &nb);
- if (nb > (ssize_t)(sizeof buf))
- nb = sizeof buf;
- nb = read(STDIN_FILENO, buf, nb);
- display(&my_win, buf, nb);
- /* might lose data here because sockt is non-blocking */
- for (i = 0; i < nb; ++i)
- if (buf[i] == '\r')
- buf[i] = '\n';
- write(sockt, buf, nb);
- }
- }
- }
- /*
- * p_error prints the system error message on the standard location
- * on the screen and then exits. (i.e. a curses version of perror)
- */
- void
- p_error(const char *string)
- {
- wmove(my_win.x_win, current_line, 0);
- wprintw(my_win.x_win, "[%s : %s (%d)]\n",
- string, strerror(errno), errno);
- wrefresh(my_win.x_win);
- move(LINES-1, 0);
- refresh();
- quit();
- }
- /*
- * Display string in the standard location
- */
- void
- message(const char *string)
- {
- wmove(my_win.x_win, current_line, 0);
- wprintw(my_win.x_win, "[%s]\n", string);
- if (current_line < my_win.x_nlines - 1)
- current_line++;
- wrefresh(my_win.x_win);
- }