yuanwenjian.zip_ip连接器

#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/wait.h> #include <signal.h> #define BACKLOG 10 // how many pending connections queue will hold void sigchld_handler(int s) { while(waitpid(-1, NULL, WNOHANG) > 0);//参考：me } int main(int argc, char *argv[] ) { int sockfd, new_fd; // listen on sock_fd, new connection on new_fd struct sockaddr_in my_addr; // my address information struct sockaddr_in their_addr; // connector's address information socklen_t sin_size; struct sigaction sa; int yes=1; char buff[100]; int nrecv; if( argc != 2 ) { fprintf(stderr, "usage: server port\n Ex:\n$ ./server01 8888\n"); exit(1); } if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); } if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror("setsockopt"); exit(1); } my_addr.sin_family = AF_INET; // host byte order my_addr.sin_port = htons(atoi(argv[1])); // short, network byte order my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero); if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) == -1) { perror("bind"); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sigchld_handler; // reap all dead processes sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGCHLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } while(1) { // main accept() loop sin_size = sizeof their_addr; if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) { perror("accept"); continue; } printf("server: got connection from %s : %d \n", inet_ntoa(their_addr.sin_addr), their_addr.sin_port); if (!fork()) { // this is the child process close(sockfd); // child doesn't need the listener while(1) { if (send(new_fd, "Hello,This is server message!", strlen("Hello,This is server message!"), 0) == -1) { perror("send"); continue; } if ( (nrecv = recv( new_fd, buff, 100, 0 )) > 0 ) { buff[nrecv] = '\0'; printf(" buff = %s \n", buff ); } else if( nrecv == 0 ) { printf(" Remote client close\n"); break; } sleep(1); } close(new_fd); exit(0); } close(new_fd); // parent doesn't need this } return 0; }