原文:socket簡單通信

粗糙簡略的初版，后續多加點功能權當練手 /* ============================================================================ Name : server.c Author : king Version : Copyright : Your copyright notice Description : 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; // 返回值設置 socklen_t lent; int pid; addr.sin_family = AF_INET; //IPv4 Internet protocols addr.sin_port = htons(5050); //這里輸入服務器端口號 addr.sin_addr.s_addr = inet_addr(myaddr); ; //INADDR_ANY表示本機IP//獲取socket描述符，IPV4asd printf("socket start \n"); sfd = socket(AF_INET, SOCK_STREAM, 0);if (sfd < 0) { printf("socket error \n"); return -1; } printf("bind start \n"); //將套接子與指定端口鏈接 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 (;;) { //接受來自客戶端的信息 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) { //error close(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.cAuthor : kingVersion :Copyright : Your copyright noticeDescription : 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; }

?

雖然寫程序寫了好幾年，感覺還是技術不過關，于是把socket從新復習了下，
期間遇到錯誤一直沒有編譯過去：
connect和accept
因為沒有深刻了解這兩函數的參數，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要是一個指針

這倆個郁悶死我了，我以為是一樣的，結果調了1小時。

還需努力啊。

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