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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <signal.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXLINE 1024
int main(int argc, char **argv)
{
int server_sockfd, client_sockfd;
int state, client_len;
int pid;
struct sockaddr_in clientaddr, serveraddr;
char buf[MAXLINE];
if (argc != 2)
{
printf("Usage : %s [port]\n", argv[0]);
return 1;
}
// internet 스트림 소켓을 만들도록 한다.
if ((server_sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket error : ");
exit(0);
}
bzero(&serveraddr, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
serveraddr.sin_port = htons(atoi(argv[1]));
state = bind(server_sockfd , (struct sockaddr *)&serveraddr, sizeof(serveraddr));
if (state == -1)
{
perror("bind error : ");
exit(0);
}
state = listen(server_sockfd, 5);
if (state == -1)
{
perror("listen error : ");
exit(0);
}
signal(SIGCHLD, SIG_IGN);
while(1)
{
client_sockfd = accept(server_sockfd, (struct sockaddr *)&clientaddr, &client_len);
if (client_sockfd == -1)
{
perror("Accept error : ");
exit(0);
}
printf("Accept Success!!\n");
pid = fork();
if (pid == 0)
{
while(1)
{
memset(buf, 0x00, MAXLINE);
if (read(client_sockfd, buf, MAXLINE-1) <= 0)
{
close(client_sockfd);
exit(0);
}
printf(" > %s", buf);
write(client_sockfd, buf, strlen(buf));
}
}
if (pid == -1)
{
perror("fork error : ");
return 1;
}
}
close(client_sockfd);
}
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