基本socket通信

#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/in.h>
#include <unistd.h>
#include <fcntl.h>


int main()
{
	int max,i;
	int fd = 0;
	int se_num;
	int sock,client_sock;
	int num;
	fd_set rset;
	char buf[512];
	struct sockaddr_in server_addr;
	struct sockaddr client_addr;
	int len = sizeof(struct sockaddr);
	server_addr.sin_family = AF_INET;
	server_addr.sin_port = htons(2631);
	/* it is ok */
	//server_addr.sin_addr.s_addr = htonl(0x7f000001);
	inet_aton("127.0.0.1",&server_addr.sin_addr);
	int fl_sock;

	if((sock = socket(AF_INET,SOCK_STREAM,0)) < 0) {
		perror("socket");
		return -1;
	}

	if((bind(sock,(struct sockaddr *)&server_addr,sizeof(struct sockaddr))) < 0) {
		perror("bind");
		return -1;
	}
	if((listen(sock,5)) < 0) {
		perror("listen");
		return -1;
	}

	if((client_sock = accept(sock,&client_addr,&len)) < 0) 
	{
		perror("accept");
		return -1;
	}
	fprintf(stderr,"client_sock = %d\n",client_sock);
	while(1) {
		memset(buf,0,sizeof(buf));
		if((num=read(client_sock,buf,sizeof(buf))) == 0) {
			fprintf(stderr,"client is closed\n");
			return -1;
		}
		printf("client(num=%d): %s\n",num,buf);
	}
}

#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/in.h>
#include <unistd.h>
#include <fcntl.h>

void sig_pipe(int a)
{
	printf("receive signal pipe\n");
	exit(-1);
}
int main()
{
	int sock,client_sock;
	fd_set rset;
	int num;
	char buf[] = "hello world\0r";
	struct sockaddr_in server_addr;
	struct sockaddr client_addr;
	int len = sizeof(struct sockaddr);
	server_addr.sin_family = AF_INET;
	server_addr.sin_port = htons(2631);
	inet_aton("127.0.0.1",&server_addr.sin_addr);

	signal(SIGPIPE,sig_pipe);
	if((sock = socket(AF_INET,SOCK_STREAM,0)) < 0) {
		perror("socket");
		return -1;
	}
	if(connect(sock,(struct sockaddr *)&server_addr,sizeof(struct sockaddr)) < 0) {
		perror("connect");
		return -1;
	}
	while(1) {
		printf("write %d\n",write(sock,buf,sizeof(buf)));
		sleep(1);
	}

}