Linux——高性能服务器编程，多进程编程

Linux——高性能服务器编程，多进程编程

多进程编程思路： 父进程只负责accept ---》fork，子进程负责和客户端进行通讯。
注意：
1、 父子进程共享文件描述符，所以创建出子进程后，没必要单独传递文件描述符。
2、 父进程创建出子进程后， 关闭accept返回的文件描述符。

服务器端代码 ser.c：

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <assert.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <fcntl.h>#include <signal.h>void fun(int sign){wait(NULL);}void main(){signal(SIGCHLD, fun);int sockfd = socket(AF_INET, SOCK_STREAM, 0);assert(sockfd != -1);struct sockaddr_in ser, cli;memset(&ser, 0, sizeof(ser));ser.sin_family = AF_INET;ser.sin_port = htons(6500);ser.sin_addr.s_addr = inet_addr("192.168.1.120");int res = bind(sockfd, (struct sockaddr*)&ser, sizeof(ser));assert(res != -1);listen(sockfd, 5);while(1){int len = sizeof(cli);int c = accept(sockfd, (struct sockaddr*)&cli, &len);if(c < 0){printf("error\n");continue;}pid_t n = fork();assert(n != -1);if(n == 0){while(1){char buff[128] = {0};int n = recv(c, buff, 127, 0);if(n <= 0){break;}printf("addr::%s   port::%d\n", inet_ntoa(cli.sin_addr), ntohs(cli.sin_port));printf("%s\n", buff);send(c, "OK", 2, 0);}printf("%d unlink\n", c);close(c);exit(0);}close(c);}}

客户端代码  cli.c:

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <assert.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <fcntl.h>void main(){int sockfd = socket(AF_INET, SOCK_STREAM, 0);assert(sockfd != -1);struct sockaddr_in ser, cli;memset(&ser, 0, sizeof(ser));ser.sin_family = AF_INET;ser.sin_port = htons(6500);ser.sin_addr.s_addr = inet_addr("192.168.1.120");int res = connect(sockfd, (struct sockaddr*)&ser, sizeof(ser));assert(res != -1);while(1){printf("please input: ");fflush(stdout);char buff[128] = {0};fgets(buff, 128, stdin);if(strncmp(buff, "end", 3) == 0){close(sockfd);break;}send(sockfd, buff, strlen(buff) - 1, 0);memset(buff, 0, 128);recv(sockfd, buff, 127, 0);printf("%s\n", buff);}}

运行结果：

可以支持多个客户端同时访问