Linux_ 多进程并发服务TCP

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client1.c

#include <sys/types.h>#include <sys/socket.h>#include <sys/stat.h>#include <sys/un.h>#include <netinet/in.h>#include <arpa/inet.h>#include <fcntl.h>#include <stdlib.h>#include <stdio.h>#include <errno.h>#include <signal.h>#define BUFF_SIZE 1024int main(void){    int sockfd;    struct sockaddr_in server_addr, client_addr;    int ret;    int pd;    char buff[BUFF_SIZE];    sockfd = socket (AF_INET, SOCK_STREAM, 0);    server_addr.sin_addr.s_addr = inet_addr("10.10.0.9");    server_addr.sin_family = AF_INET;    server_addr.sin_port = htons(9000);    ret = connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));    if (ret == -1) {        perror("connect");        exit(errno);    }    sprintf(buff, "process(%u) send msg", getpid());    ret = write(sockfd, buff, strlen(buff)+1);    if (ret == -1) {        perror("client write");        exit(errno);    }    ret = read(sockfd, buff, sizeof(buff));    if (ret == -1) {        perror("client read");        exit(errno);    }    printf("received: %s\n", buff);    exit(0);}

server1.c

#include <sys/types.h>#include <sys/socket.h>#include <sys/stat.h>#include <sys/un.h>#include <netinet/in.h>#include <arpa/inet.h>#include <fcntl.h>#include <stdlib.h>#include <stdio.h>#include <errno.h>#include <signal.h>#define BUFF_SIZE 1024void handle_sigchld(int sig){    printf("catch a sig(%d)\n", sig);    wait(NULL);}static void str2up(char *p){    while (*p) {        if (*p >= 'a' && *p <= 'z') {            *p = *p - 'a' + 'A';        }        p++;    }}int main(void){    int sockfd, clientfd;    struct sockaddr_in server_addr, client_addr;    int ret;    int pd;    char buff[BUFF_SIZE];    //socklen_t len = sizeof(struct sockaddr_in);    socklen_t len= sizeof(struct sockaddr);    sockfd = socket (AF_INET, SOCK_STREAM, 0);    server_addr.sin_addr.s_addr = htons(INADDR_ANY);    server_addr.sin_family = AF_INET;    server_addr.sin_port = htons(9000);    ret = bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));    if (ret == -1) {        perror("bind");        exit(errno);    }    ret = listen(sockfd, 5);    if (ret == -1) {        perror("listen");        exit(errno);    }    signal(SIGCHLD, handle_sigchld);    while (1) {        clientfd = accept(sockfd, (struct sockaddr*)&server_addr, &len);        if (clientfd == -1) {            perror("accept");            exit(errno);        }        printf("clientfd=%d\n", clientfd);        pd = fork();        if (pd == -1) {            perror("fork");            exit(errno);        } else if (pd == 0) {            close(sockfd);            ret = read(clientfd, buff, sizeof(buff));            printf("Process(%d),ret=%d, received: %s\n", getpid(), ret, buff);            str2up(buff);            ret = write(clientfd, buff, strlen(buff)+1);            printf("ret=%d\n", ret);            close(clientfd);                        exit(0);        }     }    exit(0);}

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