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

				/***************************************************************************/
				/* */
				/* Server program which wait for the client to connect and reads the data */
				/* using non-blocking socket. */
				/* The reading of non-blocking sockets is done in a loop until data */
				/* arrives to the sockfd. */
				/* */
				/* based on Beej's program - look in the simple TCP server for further doc.*/
				/* */
				/* */
				/***************************************************************************/

				#include <stdio.h>
				#include <stdlib.h>
				#include <errno.h>
				#include <string.h>
				#include <sys/types.h>
				#include <netinet/in.h>
				#include <arpa/inet.h>
				#include <sys/socket.h>
				#include <sys/wait.h>
				#include <fcntl.h>        /* Added for the nonblocking socket */

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

				int main()
				{
				    int sockfd, new_fd;    /* listen on sock_fd, new connection on new_fd */
				    struct sockaddr_in my_addr;    /* my address information */
				    struct sockaddr_in their_addr;    /* connector's address information */
				    int sin_size;
				    char string_read[255];
				    int n, i;
				    int last_fd;        /* Thelast sockfd that is connected */

				    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
				        perror("socket");
				        exit(1);
				    }

				    last_fd = sockfd;

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

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

				    if (listen(sockfd, BACKLOG) == -1) {
				        perror("listen");
				        exit(1);
				    }

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

				    while (1) {
				        for (i = sockfd; i <= last_fd; i++) {
				            printf("Round number %d
", i);
				            if (i = sockfd) {
				                sin_size = sizeof(struct sockaddr_in);
				                if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
				                    perror("accept");
				                }
				                printf("server: got connection from %s
", inet_ntoa(their_addr.sin_addr));
				                fcntl(new_fd, F_SETFL, O_NONBLOCK);
				                last_fd = new_fd;
				            } else {
				                n = recv(new_fd, string_read, sizeof(string_read), 0);
				                if (n < 1) {
				                    perror("recv - non blocking 
");
				                    printf("Round %d, and the data read size is: n=%d 
", i, n);
				                } else {
				                    string_read[n] = '0';
				                    printf("The string is: %s 
", string_read);
				                    if (send(new_fd, "Hello, world!
", 14, 0) == -1)
				                        perror("send");
				                }
				            }
				        }
				    }
				    return 0;
				}

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

点击(此处)折叠或打开

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

				#include <stdio.h>
				#include <stdlib.h>
				#include <errno.h>
				#include <string.h>
				#include <netdb.h>
				#include <sys/types.h>
				#include <netinet/in.h>
				#include <sys/socket.h>
				#include <unistd.h>

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

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

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

				    if (argc != 2) {
				        fprintf(stderr, "usage: client hostname
");
				        exit(1);
				    }

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

				    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
				        perror("socket");
				        exit(1);
				    }

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

				    if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
				        perror("connect");
				        exit(1);
				    }
				    /* sleep(5); */
				    while (1) {
				        if (send(sockfd, "Hello, world!
", 14, 0) == -1)
				            perror("send");
				        printf("In loop 
");
				        sleep(2);
				    }
				    close(sockfd);

				    return 0;
				}

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