/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

  1. /*
  2. * Copyright (c) 1983, 1993
  3. * The Regents of the University of California. All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 4. Neither the name of the University nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. */
  29. #include <sys/cdefs.h>
  30. __FBSDID("$FreeBSD$");
  31. #ifndef lint
  32. static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
  33. #endif
  34. /*
  35. * This file contains the I/O handling and the exchange of
  36. * edit characters. This connection itself is established in
  37. * ctl.c
  38. */
  39. #include <sys/filio.h>
  40. #include <errno.h>
  41. #include <signal.h>
  42. #include <netdb.h>
  43. #include <stdlib.h>
  44. #include <string.h>
  45. #include <unistd.h>
  46. #include "talk.h"
  47. #include "talk_ctl.h"
  48. #define A_LONG_TIME 10000000
  49. volatile sig_atomic_t gotwinch = 0;
  50. /*
  51. * The routine to do the actual talking
  52. */
  53. void
  54. talk(void)
  55. {
  56. struct hostent *hp, *hp2;
  57. int nb;
  58. fd_set read_set, read_template;
  59. char buf[BUFSIZ], **addr, *his_machine_name;
  60. struct timeval wait;
  61. his_machine_name = NULL;
  62. hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
  63. sizeof(his_machine_addr.s_addr), AF_INET);
  64. if (hp != NULL) {
  65. hp2 = gethostbyname(hp->h_name);
  66. if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
  67. hp2->h_length == sizeof(his_machine_addr))
  68. for (addr = hp2->h_addr_list; *addr != NULL; addr++)
  69. if (memcmp(*addr, &his_machine_addr,
  70. sizeof(his_machine_addr)) == 0) {
  71. his_machine_name = strdup(hp->h_name);
  72. break;
  73. }
  74. }
  75. if (his_machine_name == NULL)
  76. his_machine_name = strdup(inet_ntoa(his_machine_addr));
  77. snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
  78. msg.r_name, his_machine_name);
  79. free(his_machine_name);
  80. message(buf);
  81. write(STDOUT_FILENO, "\007\007\007", 3);
  82. current_line = 0;
  83. /*
  84. * Wait on both the other process (sockt_mask) and
  85. * standard input ( STDIN_MASK )
  86. */
  87. FD_ZERO(&read_template);
  88. FD_SET(sockt, &read_template);
  89. FD_SET(fileno(stdin), &read_template);
  90. for (;;) {
  91. read_set = read_template;
  92. wait.tv_sec = A_LONG_TIME;
  93. wait.tv_usec = 0;
  94. nb = select(32, &read_set, 0, 0, &wait);
  95. if (gotwinch) {
  96. resize_display();
  97. gotwinch = 0;
  98. }
  99. if (nb <= 0) {
  100. if (errno == EINTR) {
  101. read_set = read_template;
  102. continue;
  103. }
  104. /* panic, we don't know what happened */
  105. p_error("Unexpected error from select");
  106. quit();
  107. }
  108. if (FD_ISSET(sockt, &read_set)) {
  109. /* There is data on sockt */
  110. nb = read(sockt, buf, sizeof buf);
  111. if (nb <= 0) {
  112. message("Connection closed. Exiting");
  113. quit();
  114. }
  115. display(&his_win, buf, nb);
  116. }
  117. if (FD_ISSET(fileno(stdin), &read_set)) {
  118. /*
  119. * We can't make the tty non_blocking, because
  120. * curses's output routines would screw up
  121. */
  122. int i;
  123. ioctl(0, FIONREAD, (void *) &nb);
  124. if (nb > (ssize_t)(sizeof buf))
  125. nb = sizeof buf;
  126. nb = read(STDIN_FILENO, buf, nb);
  127. display(&my_win, buf, nb);
  128. /* might lose data here because sockt is non-blocking */
  129. for (i = 0; i < nb; ++i)
  130. if (buf[i] == '\r')
  131. buf[i] = '\n';
  132. write(sockt, buf, nb);
  133. }
  134. }
  135. }
  136. /*
  137. * p_error prints the system error message on the standard location
  138. * on the screen and then exits. (i.e. a curses version of perror)
  139. */
  140. void
  141. p_error(const char *string)
  142. {
  143. wmove(my_win.x_win, current_line, 0);
  144. wprintw(my_win.x_win, "[%s : %s (%d)]\n",
  145. string, strerror(errno), errno);
  146. wrefresh(my_win.x_win);
  147. move(LINES-1, 0);
  148. refresh();
  149. quit();
  150. }
  151. /*
  152. * Display string in the standard location
  153. */
  154. void
  155. message(const char *string)
  156. {
  157. wmove(my_win.x_win, current_line, 0);
  158. wprintw(my_win.x_win, "[%s]\n", string);
  159. if (current_line < my_win.x_nlines - 1)
  160. current_line++;
  161. wrefresh(my_win.x_win);
  162. }