http://www.클라이언트.com #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 1024
void error_handling(char *message);
int main(int argc, char* argv[])
{
int sock, fd;
struct sockaddr_in serv_addr;
char message[BUF_SIZE];
int str_len, recv_len, recv_cnt;
if(argc!=3){
printf("Usage : $s <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[1]);
serv_addr.sin_port=htons(atoi(argv[2]));
if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
error_handling("connect() error!");
else
puts("connected............");
// while(1)
// {
fputs ("Input message(Q to quit) : ", stdout);
/* fgets(message, BUF_SIZE, stdin);
if(!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
break;
*/
fd=open("test.txt", O_RDONLY);
if(fd==-1)
error_handling("open() error!");
printf("file descriptor : %d \n", fd);
if(read(fd, message, sizeof(message))==-1)
error_handling("read() error!");
printf("file data : %s", message);
str_len=write(sock, message, strlen(message));
recv_len=0;
while(recv_len<str_len)
{
recv_cnt=read(sock, &message[recv_len], BUF_SIZE-1);
if(recv_cnt==-1)
error_handling("read() error!");
recv_len+=recv_cnt;
}
message[recv_len]=0;
printf("message from server : %s", message);
// }
close(sock);
return 0;
}
/*
str_len=read(sock, message, sizeof(message) -1);
if(str_len == -1)
error_handling("read() error!");
printf("Message from server: %s \n", message);
close(sock);
return 0;
}
*/
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
http://www.서버.com #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 1024
void error_handling(char *message);
int main(int argc, char *argv[])
{
int serv_sock, clnt_sock, fd, str_len, i;
struct sockaddr_in serv_addr, clnt_addr;
socklen_t clnt_addr_size;
char message[BUF_SIZE];
if(argc!=2)
{
printf("Usage : $s <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[1]));
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);
for(i=0; i<5; i++)
{
clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
if(clnt_sock==-1)
error_handling("accept() error");
else
printf("Connected clinent %d \n", i+1);
fd=open("testget.txt", O_CREAT|O_WRONLY, 0644);
if(fd==-1)
error_handling("open() error!");
printf("file descriptor : %d \n", fd);
while((str_len=read(clnt_sock, message, BUF_SIZE))!=0)
// write(clnt_sock, message, str_len);
if(write(fd, message, sizeof(message))==-1)
error_handling("write() error!");
close(clnt_sock);
}
close(serv_sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}