my socket

时间：2010-07-02 来源：checl1987_EE

server.c #include<stdio.h> #include<unistd.h> #include<string.h> #include<stdlib.h> #include<sys/socket.h> #include<errno.h> #include<netinet/in.h> #include<arpa/inet.h>
#define DEFAULTPORT 2014 #define DEFAULT_BACKLOG 20 int main(int argc ,char *argv[]) {    struct sockaddr_in socket_addr;    struct sockaddr_in socket_acpt;    char buf[30] = {0};    int recv_len;    int acpt_len = sizeof(struct sockaddr_in);    int accept_clt;
   memset(&socket_addr, 0, sizeof(socket_addr));    socket_addr.sin_family = AF_INET;    socket_addr.sin_port = htons(DEFAULTPORT);    socket_addr.sin_addr.s_addr = htons(INADDR_ANY);    bzero(&(socket_addr.sin_zero), 8);

   int socket_fd = socket(PF_INET, SOCK_STREAM, 0);    if (socket_fd == -1){    printf("Socket Error log is : %s\n", strerror(errno));    close(socket_fd);    exit(0);    }

   if (bind(socket_fd, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1){    printf("Bind Error log is : %s\n", strerror(errno));    close(socket_fd);    exit(0);    }    else    {    if (listen(socket_fd, DEFAULT_BACKLOG) == -1){    printf("Listen Error log is : %s\n", strerror(errno));    close(socket_fd);    exit(0);    }    else    {    while(1){    accept_clt = accept(socket_fd, (struct sockaddr *)&socket_acpt, (socklen_t *)&acpt_len);    if(accept_clt == -1){    printf("Accept Error log is : %s\n", strerror(errno));    close(socket_fd);    exit(0);    }    printf("received a connection from %s\n", inet_ntoa(socket_acpt.sin_addr));    recv_len = recv(accept_clt, buf, sizeof(buf), MSG_WAITALL);    if (recv_len == -1){    printf("Accept Error log is : %s\n", strerror(errno));    close(socket_fd);    exit(0);    }    printf("recv data : %s\n", buf);    memset(buf, 0, sizeof(buf));    }    }    }    return 0; }

client.c

#include<stdio.h> #include<unistd.h> #include<string.h> #include<stdlib.h> #include<sys/socket.h> #include<errno.h> #include<netdb.h> #include<netinet/in.h> #include<arpa/inet.h>
#define DEFAULTPORT 2014 #define DEFAULT_BACKLOG 20 int main(int argc ,char *argv[]) {    struct sockaddr_in socket_addr;    struct hostent *host;
   if (argc < 2) {    fprintf(stderr,"Please enter what you want to send !\n");    exit(1);    }
   if((host=gethostbyname("127.0.0.1")) == NULL) {    herror("gethostbyname error !");    exit(1);    }
   socket_addr.sin_family = AF_INET;    socket_addr.sin_port = htons(DEFAULTPORT);    socket_addr.sin_addr = *((struct in_addr *)host->h_addr);    bzero(&(socket_addr.sin_zero), 8);
   int socket_fd = socket(PF_INET, SOCK_STREAM, 0);    if (socket_fd == -1)    printf("Socket Error log is : %s\n", strerror(errno));
   if (connect(socket_fd, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr)) == -1) {    perror("connect error !");    }    if (send(socket_fd, argv[1], 40, 0) == -1){    perror("send error !");    close(socket_fd);    }
   return 0; }
注意： 1 出现Transport endpoint is not connected错误，可能是由于send, recv时候，所选的socket_fd不对，应该选accept的返回的socketfd，这个新socketfd是真正的send,recv所用的socketfd，而不socket()出来的。
2 client地址配为127.0.0.1, server配为INADDR_ANY。
3 查看server启动起来没有，可以用命令netstat -na | grep 端口号（本例为2014）