Linux下网络编程服务器_客户端的C程序

#include <unistd.h> #include <arpa/inet.h> #include <strings.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #define BACKLOG 5 main() { int fd, connectfd; char buf[1024]; struct sockaddr_in addr, client; socklen_t sock_size; int n; char c; struct timeval tv; fd_set rdfds; pid_t pid; tv.tv_sec = 0; tv.tv_usec = 10000; fd = socket(AF_INET, SOCK_STREAM, 0); bzero(&addr, sizeof(struct sockaddr_in)); addr.sin_family = AF_INET; addr.sin_port = htons(5678); addr.sin_addr.s_addr = htonl(INADDR_ANY); bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)); listen(fd, BACKLOG); sock_size = sizeof(struct sockaddr); FD_ZERO(&rdfds); for(;;) { connectfd = accept(fd, (struct sockaddr *)&client, (socklen_t *)&sock_size); pid = fork(); if(pid > 0) close(connectfd); else for(;;) { FD_SET(0, &rdfds); FD_SET(connectfd, &rdfds); select(connectfd + 1, &rdfds, NULL, NULL, &tv); if(FD_ISSET(connectfd, &rdfds)) { read(connectfd, &c, 1); fprintf(stderr, "%c", c); } if(FD_ISSET(0, &rdfds)) { read(0, &c, 1); write(connectfd, &c, 1); } } } close(fd); } // note: set terminal with 'stty cbreak'