点对点通网络通信程序

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服务器端、

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<ctype.h>#include<signal.h>void handler(int sig){        printf("recv a sig=%d\n",sig);        exit(EXIT_SUCCESS);}int main(){int listenfd;listenfd = socket(AF_INET, SOCK_STREAM, 0);struct sockaddr_in servaddr;memset(&servaddr, 0, sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(5188);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);int on = 1;setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr));listen(listenfd, 20);while (1){struct sockaddr_in cliaddr;socklen_t cliaddr_len;int connfd = accept(listenfd, (struct sockaddr*)&cliaddr, &cliaddr_len);printf("ip=%s port=%d\n", inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port));pid_t pid = fork();if (pid < 0){printf("error\n");}if (pid == 0){close(listenfd);char sendbuf[1024] = { 0 };while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL){write(connfd, sendbuf, strlen(sendbuf));memset(sendbuf, 0, sizeof(sendbuf));}            printf("server child close\n");            kill(pid,SIGUSR1);                 exit(EXIT_SUCCESS);}else if (pid > 0){char recvbuf[1024];    signal(SIGUSR1,handler);            while (1){memset(recvbuf, 0, sizeof(recvbuf));int ret = read(connfd, recvbuf, sizeof(recvbuf));if (ret == -1){        printf("error\n");                                        exit(0);}if (ret == 0){printf("client close\n");break;}fputs(recvbuf, stdout);}            printf("server parent close\n");            exit(EXIT_SUCCESS);}}close(listenfd);}

客户端

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<ctype.h>#include<signal.h>const int MAX = 128;void handler(int sig){        printf("recv a sig=%d\n",sig);        exit(EXIT_SUCCESS);}int main(){int sockfd;sockfd = socket(AF_INET, SOCK_STREAM, 0);struct sockaddr_in servaddr;memset(&servaddr, 0, sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(5188);servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr));pid_t pid = fork();if (pid < 0){printf("error\n");}else if (pid == 0){char sendbuf[MAX] = { 0 };while (fgets(sendbuf, sizeof(sendbuf), stdin)){write(sockfd, sendbuf, strlen(sendbuf));memset(sendbuf, 0, MAX);}        printf("client child close\n");kill(getpid(),SIGUSR1);exit(EXIT_SUCCESS);}else if (pid > 0){    signal(SIGUSR1,handler);        char recvbuf[MAX] = { 0 };while (1){int n = read(sockfd, recvbuf, MAX);if (n == -1)                        {                                printf("error\n");                                exit(0);                        }else if (n == 0){printf("server close\n");break;}fputs(recvbuf, stdout);memset(recvbuf, 0, MAX);}        printf("client paretn close\n");exit(EXIT_SUCCESS);}close(sockfd);}

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