socket簡單通訊

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原文:socket簡單通訊

粗糙簡略的初版，後續多加點功能權當練手

/*============================================================================Name : server.cAuthor : kingVersion :Copyright : Your copyright noticeDescription : Hello World in C, Ansi-style============================================================================*/#include <stdlib.h>#include <pthread.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h> /* inet(3) functions */#include <stdlib.h>#include <errno.h>#include <stdio.h>#include <string.h>int handle(int point);int main(void) {int sfd, ind;struct sockaddr_in addr;struct sockaddr_in clent;char resv[1024], sendbuf[1024];char buf[1024];char * myaddr = "192.168.231.128";int ret; // 傳回值設定socklen_t lent;int pid;addr.sin_family = AF_INET; //IPv4 Internet protocolsaddr.sin_port = htons(5050); //這裡輸入伺服器連接埠號碼addr.sin_addr.s_addr = inet_addr(myaddr);; //INADDR_ANY表示本機IP//獲取socket描述符，IPV4asdprintf("socket start \n");sfd = socket(AF_INET, SOCK_STREAM, 0);if (sfd < 0) {printf("socket error \n");return -1;}printf("bind start \n");//將套接子與指定連接埠連結if (bind(sfd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) < 0) {printf("bind error \n");return -1;}//監聽套接子printf("listen start \n");if (listen(sfd, 1024) < 0) {printf("listen error \n");return -1;}for (;;) {//接受來自用戶端的資訊printf("accept start \n");memset(&clent, 0, sizeof(clent));lent = sizeof(clent);ind = accept(sfd, (struct sockaddr *) &clent, &lent);if (ind < 0) {printf("accept error %d \n", ind);return -1;}printf("infor \n");printf("clent addr%s porit %d\n",inet_ntop(AF_INET, &clent.sin_addr, buf, sizeof(buf)),ntohs(clent.sin_port));pid = fork();if (pid == 0) {//子進程close(sfd);handle(ind);} else if (pid < 0) {//errorclose(ind);} else {//父進程}}return EXIT_SUCCESS;}int handle(int point) {int retn;char buf[1024];for (;;) {retn = read(point, buf, sizeof(buf));if (retn < 0) {printf("read error \n");close(point);break;} else if (retn == 0) {printf("client exit \n");close(point);break;}printf("client:%s\n", buf);if (strcmp("exit", buf) == 0) {printf("exit \n");close(point);return 0;}}return 0;}

/* ============================================================================ Name        : client.c Author      : king Version     : Copyright   : Your copyright notice Description : Hello World in C, Ansi-style ============================================================================ */#include <stdio.h>#include <stdlib.h>#include <sys/socket.h>#include  <netinet/in.h>#include  <arpa/inet.h>       /* inet(3) functions */int handle(int fd);int main(void) {    int nsd;    char buf[1024];    char * myaddr = "192.168.231.128";    struct sockaddr_in addr;    printf("welcome to echo client\n");    nsd = socket(AF_INET, SOCK_STREAM, 0);    printf("connect start1 \n");    //bzero(addr, sizeof(*addr));    memset(&addr,0,sizeof(addr));    printf("connect start2 \n");    addr.sin_family = AF_INET;    addr.sin_port = htons(5050);    addr.sin_addr.s_addr=inet_addr(myaddr);    printf("connect start3 \n");    if (connect(nsd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) < 0) {        printf("connect error \n");        return -1;    }    sleep(5);    printf("handle start\n");    handle(nsd);    close(nsd);    return EXIT_SUCCESS;}int handle(int fd) {    char sendl[1024], rev[1024];    int retn;    for (;;) {        memset(sendl,0,sizeof(sendl));        memset(rev,0,sizeof(rev));        if (fgets(sendl, 1024, stdin) == NULL) {            break;        }        //        printf("wirte start\n");        write(fd, sendl, strlen(sendl));        read(fd, rev,strlen(rev));    }    return 0;}

 

雖然寫程式寫了好幾年，感覺還是技術不過關，於是把socket從新複習了下，
期間遇到錯誤一直沒有編譯過去：
connect和accept
因為沒有深刻瞭解這兩函數的參數，所以釀成打錯

 

int connect(int sockfd, const struct sockaddr *addr,
socklen_t addrlen);

記住一定是值 addrlen

accept   socklen_t *addrlen要是一個指標

這倆個鬱悶死我了，我以為是一樣的，結果調了1小時。

還需努力啊。

socket簡單通訊