socket example 1

소켓통신에 대한 코드를 다른 블로그에서 본 후에 약간 수정을 하였습니다.

 ( 출처 :http://blog.naver.com/hanhi95/220317030958 )



 socketServer.c

/* * * http://blog.naver.com/hanhi95/220317030958 */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h> #include <fcntl.h> #define BUF_SIZE 100 void error_handling(char *message); int main(int argc, char *argv[]) { int serv_sock; int clnt_sock; struct sockaddr_in serv_addr; struct sockaddr_in clnt_addr; socklen_t clnt_addr_size; int fd; //char buf[BUF_SIZE] = {'\0', }; char buf[BUF_SIZE]; memset(buf, 0, sizeof(buf)); fd = open(argv[1], O_RDONLY); if (fd == -1) error_handling("open() error!"); if (read(fd, buf, sizeof(buf)) == -1) error_handling("read() error!"); close(fd); if (argc != 3) { printf("Usage : %s<txt> <port>\n", argv[0]); exit(1); } serv_sock = socket(PF_INET, SOCK_STREAM, 0); if (serv_sock == -1) error_handling("Socket() error"); memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(atoi(argv[2])); if (bind(serv_sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) == -1) error_handling("bind() error"); if (listen(serv_sock, 5) == -1) error_handling("listen() error"); clnt_addr_size = sizeof(clnt_addr); clnt_sock = accept(serv_sock, (struct sockaddr*) &clnt_addr, &clnt_addr_size); if (clnt_sock == -1) error_handling("accept() error"); write(clnt_sock, buf, sizeof(buf)); close(clnt_sock); close(serv_sock); return 0; } void error_handling(char *message) { fputs(message, stderr); fputc('\n', stderr); exit(1); }

socketClient.c

 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h> #include <fcntl.h> #define BUF_SIZE 100 void error_handling(char *message); int main(int argc, char *argv[]) { int sock; struct sockaddr_in serv_addr; char message[BUF_SIZE]; //char message[10]; int str_len; int fd; if (argc != 4) { printf("Usage : %s<txt> <IP> <port \n", argv[0]); exit(1); } sock = socket(PF_INET, SOCK_STREAM, 0); if (sock == -1) error_handling("socket() error"); memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr(argv[2]); serv_addr.sin_port = htons(atoi(argv[3])); if (connect(sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) == -1) error_handling("connet() error!"); str_len = read(sock, message, sizeof(message)); if (str_len == -1) error_handling("read() error!"); printf("message from server\n%s", message); printf("%d\n", sizeof(message)); printf("%d\n", strlen(message)); fd = open(argv[1], O_CREAT | O_WRONLY | O_TRUNC); if (fd == -1 ) error_handling("open() error!"); if (write(fd, message, strlen(message)*sizeof(char)) == -1) error_handling("write() error!"); close(fd); close(sock); return 0; } void error_handling(char *message) { fputs(message, stderr); fputc('\n', stderr); exit(1); }


폴더에 파일과 컴파일 방법, 사용방법(readme.txt)를 첨부해놨습니다.

 socket.tar.gz

압축 해제하는 방법

$ tar -xvzf socket.tar.gz