/share/doc/psd/20.ipctut/ustreamread.c

https://bitbucket.org/freebsd/freebsd-head/ · C · 96 lines · 74 code · 3 blank · 19 comment · 11 complexity · a9a1d5018fd58887938e5ce7d2e76d52 MD5 · raw file

  1. .\" Copyright (c) 1986, 1993
  2. .\" The Regents of the University of California. All rights reserved.
  3. .\"
  4. .\" Redistribution and use in source and binary forms, with or without
  5. .\" modification, are permitted provided that the following conditions
  6. .\" are met:
  7. .\" 1. Redistributions of source code must retain the above copyright
  8. .\" notice, this list of conditions and the following disclaimer.
  9. .\" 2. Redistributions in binary form must reproduce the above copyright
  10. .\" notice, this list of conditions and the following disclaimer in the
  11. .\" documentation and/or other materials provided with the distribution.
  12. .\" 3. All advertising materials mentioning features or use of this software
  13. .\" must display the following acknowledgement:
  14. .\" This product includes software developed by the University of
  15. .\" California, Berkeley and its contributors.
  16. .\" 4. Neither the name of the University nor the names of its contributors
  17. .\" may be used to endorse or promote products derived from this software
  18. .\" without specific prior written permission.
  19. .\"
  20. .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21. .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22. .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23. .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24. .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25. .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26. .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27. .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28. .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29. .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30. .\" SUCH DAMAGE.
  31. .\"
  32. .\" @(#)ustreamread.c 8.1 (Berkeley) 6/8/93
  33. .\"
  34. #include <sys/types.h>
  35. #include <sys/socket.h>
  36. #include <sys/un.h>
  37. #include <stdio.h>
  38. #define NAME "socket"
  39. /*
  40. * This program creates a socket in the UNIX domain and binds a name to it.
  41. * After printing the socket's name it begins a loop. Each time through the
  42. * loop it accepts a connection and prints out messages from it. When the
  43. * connection breaks, or a termination message comes through, the program
  44. * accepts a new connection.
  45. */
  46. main()
  47. {
  48. int sock, msgsock, rval;
  49. struct sockaddr_un server;
  50. char buf[1024];
  51. /* Create socket */
  52. sock = socket(AF_UNIX, SOCK_STREAM, 0);
  53. if (sock < 0) {
  54. perror("opening stream socket");
  55. exit(1);
  56. }
  57. /* Name socket using file system name */
  58. server.sun_family = AF_UNIX;
  59. strcpy(server.sun_path, NAME);
  60. if (bind(sock, &server, sizeof(struct sockaddr_un))) {
  61. perror("binding stream socket");
  62. exit(1);
  63. }
  64. printf("Socket has name %s\en", server.sun_path);
  65. /* Start accepting connections */
  66. listen(sock, 5);
  67. for (;;) {
  68. msgsock = accept(sock, 0, 0);
  69. if (msgsock == -1)
  70. perror("accept");
  71. else do {
  72. bzero(buf, sizeof(buf));
  73. if ((rval = read(msgsock, buf, 1024)) < 0)
  74. perror("reading stream message");
  75. else if (rval == 0)
  76. printf("Ending connection\en");
  77. else
  78. printf("-->%s\en", buf);
  79. } while (rval > 0);
  80. close(msgsock);
  81. }
  82. /*
  83. * The following statements are not executed, because they follow an
  84. * infinite loop. However, most ordinary programs will not run
  85. * forever. In the UNIX domain it is necessary to tell the file
  86. * system that one is through using NAME. In most programs one uses
  87. * the call unlink() as below. Since the user will have to kill this
  88. * program, it will be necessary to remove the name by a command from
  89. * the shell.
  90. */
  91. close(sock);
  92. unlink(NAME);
  93. }