socket——tcp-nonblocking-server-client

http://www.cs.tau.ac.il/~eddiea/samples/

server.c
http://www.cs.tau.ac.il/~eddiea/samples/Non-Blocking/tcp-nonblocking-server.c.html

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  1. // gcc server.c -o server
  2. // indent -npro -kr -i8 -ts8 -sob -l280 -ss -ncs -cp1 *

  4. /***************************************************************************/
  5. /* */
  6. /* Server program which wait for the client to connect and reads the data */
  7. /* using non-blocking socket. */
  8. /* The reading of non-blocking sockets is done in a loop until data */
  9. /* arrives to the sockfd. */
  10. /* */
  11. /* based on Beej's program - look in the simple TCP server for further doc.*/
  12. /* */
  13. /* */
  14. /***************************************************************************/

  16. #include <stdio.h>
  17. #include <stdlib.h>
  18. #include <errno.h>
  19. #include <string.h>
  20. #include <sys/types.h>
  21. #include <netinet/in.h>
  22. #include <arpa/inet.h>
  23. #include <sys/socket.h>
  24. #include <sys/wait.h>
  25. #include <fcntl.h>        /* Added for the nonblocking socket */

  27. #define MYPORT 3456        /* the port users will be connecting to */
  28. #define BACKLOG 10        /* how many pending connections queue will hold */

  30. int main()
  31. {
  32.     int sockfd, new_fd;    /* listen on sock_fd, new connection on new_fd */
  33.     struct sockaddr_in my_addr;    /* my address information */
  34.     struct sockaddr_in their_addr;    /* connector's address information */
  35.     int sin_size;
  36.     char string_read[255];
  37.     int n, i;
  38.     int last_fd;        /* Thelast sockfd that is connected */

  40.     if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
  41.         perror("socket");
  42.         exit(1);
  43.     }

  45.     last_fd = sockfd;

  47.     my_addr.sin_family = AF_INET;    /* host byte order */
  48.     my_addr.sin_port = htons(MYPORT);    /* short, network byte order */
  49.     my_addr.sin_addr.s_addr = INADDR_ANY;    /* auto-fill with my IP */
  50.     bzero(&(my_addr.sin_zero), 8);    /* zero the rest of the struct */

  52.     if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
  53.         perror("bind");
  54.         exit(1);
  55.     }

  57.     if (listen(sockfd, BACKLOG) == -1) {
  58.         perror("listen");
  59.         exit(1);
  60.     }

  62.     if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
  63.         perror("accept");
  64.     }
  65.     fcntl(last_fd, F_SETFL, O_NONBLOCK);    /* Change the socket into non-blocking state */
  66.     fcntl(new_fd, F_SETFL, O_NONBLOCK);    /* Change the socket into non-blocking state */

  68.     while (1) {
  69.         for (i = sockfd; i <= last_fd; i++) {
  70.             printf("Round number %d\n", i);
  71.             if (i = sockfd) {
  72.                 sin_size = sizeof(struct sockaddr_in);
  73.                 if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
  74.                     perror("accept");
  75.                 }
  76.                 printf("server: got connection from %s\n", inet_ntoa(their_addr.sin_addr));
  77.                 fcntl(new_fd, F_SETFL, O_NONBLOCK);
  78.                 last_fd = new_fd;
  79.             } else {
  80.                 n = recv(new_fd, string_read, sizeof(string_read), 0);
  81.                 if (n < 1) {
  82.                     perror("recv - non blocking \n");
  83.                     printf("Round %d, and the data read size is: n=%d \n", i, n);
  84.                 } else {
  85.                     string_read[n] = '\0';
  86.                     printf("The string is: %s \n", string_read);
  87.                     if (send(new_fd, "Hello, world!\n", 14, 0) == -1)
  88.                         perror("send");
  89.                 }
  90.             }
  91.         }
  92.     }
  93.     return 0;
  94. }
client.c
http://www.cs.tau.ac.il/~eddiea/samples/Non-Blocking/tcp-nonblocking-client.c.html

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  1. // gcc client.c -o client
  2. // indent -npro -kr -i8 -ts8 -sob -l280 -ss -ncs -cp1 *

  4. #include <stdio.h>
  5. #include <stdlib.h>
  6. #include <errno.h>
  7. #include <string.h>
  8. #include <netdb.h>
  9. #include <sys/types.h>
  10. #include <netinet/in.h>
  11. #include <sys/socket.h>
  12. #include <unistd.h>

  14. #define PORT 3456        /* the port client will be connecting to */

  16. #define MAXDATASIZE 100        /* max number of bytes we can get at once */

  18. int main(int argc, char *argv[])
  19. {
  20.     int sockfd, numbytes;
  21.     char buf[MAXDATASIZE];
  22.     struct hostent *he;
  23.     struct sockaddr_in their_addr;    /* connector's address information */

  25.     if (argc != 2) {
  26.         fprintf(stderr, "usage: client hostname\n");
  27.         exit(1);
  28.     }

  30.     if ((he = gethostbyname(argv[1])) == NULL) {    /* get the host info */
  31.         herror("gethostbyname");
  32.         exit(1);
  33.     }

  35.     if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
  36.         perror("socket");
  37.         exit(1);
  38.     }

  40.     their_addr.sin_family = AF_INET;    /* host byte order */
  41.     their_addr.sin_port = htons(PORT);    /* short, network byte order */
  42.     their_addr.sin_addr = *((struct in_addr *)he->h_addr);
  43.     bzero(&(their_addr.sin_zero), 8);    /* zero the rest of the struct */

  45.     if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
  46.         perror("connect");
  47.         exit(1);
  48.     }
  49.     /* sleep(5); */
  50.     while (1) {
  51.         if (send(sockfd, "Hello, world!\n", 14, 0) == -1)
  52.             perror("send");
  53.         printf("In loop \n");
  54.         sleep(2);
  55.     }
  56.     close(sockfd);

  58.     return 0;
  59. }



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posted @ 2016-02-01 00:00  张同光  阅读(193)  评论(0)  编辑  收藏  举报