server.c

linux c 网络编程 测试函数setsockopt

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <strings.h>

#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/ioctl.h> 
#include <netinet/in.h>
#include <sys/types.h>
#include <netdb.h>
#include <net/if.h>
#include<string.h>

#include<signal.h>

#define SERVER_PORT 7051
char read_only_a_char();
int main()
{
	int sfd;
	struct sockaddr_in addr;
	struct sockaddr_in addr_client;
	socklen_t addrlen;
	char ch;
	char buf[1024];
	int recv_len=0;
	int sfd_client;
	struct linger linger;  

	struct protoent * protocol;

	if ( ( protocol = getprotobyname("tcp")) == NULL) {
		fprintf(stderr, "getprotobyname fail.\n");
		exit(1);
	}

	if( (sfd=socket(AF_INET,SOCK_STREAM,protocol->p_proto)) < 0 ) {
		fprintf(stderr, ":( Create socket fail.\n");
		exit(1);
	} else {
		fprintf(stdout, ":) Create socket successfully, sfd is : %d.\n", sfd);
	}
	
	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	addr.sin_port = htons(SERVER_PORT);
	
	addrlen = sizeof (struct sockaddr_in);

	if ( bind(sfd, (struct sockaddr *)&addr, sizeof(addr)) < 0 ) {
		fprintf(stderr, ":( Bind socket fail.\n");
		exit(1);
	} else {
		fprintf(stdout, ":) Bind socket successfully.\n");
	}
	
	if ( listen(sfd, 1) < 0 ) {
		fprintf(stderr, ":( Listen socket fail.\n");
		exit(1);
	} else {
		fprintf(stdout, ":) Listen socket successfully.\n");
	}
	while(1) {
		fprintf(stdout,":> Do you want to accept connect?(y/n)\n");
		ch = read_only_a_char();
		if(ch == 'y') {
			break;
		}
	}
	if ( (sfd_client=accept(sfd, (struct sockaddr *)&addr_client, &addrlen)) < 0 ) {
		fprintf(stderr, ":( Accept client fail.\n");
		exit(1);
	} else {
		fprintf(stdout, ":) Accept client successfully.\n");
	}

	memset(&linger,0,sizeof(linger));
	linger.l_onoff = 0;
	setsockopt(sfd_client,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));

	while(1) {
		fprintf(stdout, ":> Do you want to recv data or quit?(r/q)\n");
		ch = read_only_a_char();
		if(ch == 'q') {
			break;
		} else if (ch == 'r') {
			if ( (recv_len=recv(sfd_client, buf, 1024, 0)) < 0 ) {
				fprintf(stderr, ":( Recv data fail.\n");
				exit(1);
			} else {
				buf[recv_len] = 0;
				fprintf(stdout, ":) Recv data : %d-%s successfully.\n",recv_len,buf);
			}
		}
	}
	while(1) {
		fprintf(stdout, ":> Do you want to close client_sfd?(y/n)\n");
		ch = read_only_a_char();
		if(ch == 'y') {
			break;
		}
	}
	close (sfd_client);
	while(1) {
		fprintf(stdout, ":> Do you want to close server_sfd and kill me?(y/n)\n");
		ch = read_only_a_char();
		if(ch == 'y') {
			break;
		}
	}
	close (sfd);
	printf(":) bye-bye.\n");
	return 0;
}

char read_only_a_char()
{
	char ch,ch_tmp;

	if ( scanf("%c", &ch) != EOF ) {
		while ( (ch_tmp=getchar()) != '\n' && ch_tmp != EOF );
        }
	return ch;
}