client.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> 

#define SERVER_PORT 7051

char read_only_a_char();

int main()
{
	int sfd=-1;
	struct sockaddr_in addr;
	struct protoent * protocol;
	int send_len;
	char ch;

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

	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = inet_addr("192.168.48.10");
	addr.sin_port = htons(SERVER_PORT);

	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);
	}

	while(1) {
		fprintf(stdout,":> Do you want to connect to server?(y/n)\n");
		ch = read_only_a_char();
		if(ch == 'y') {
			break;
		}
	}
	if( connect(sfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
		fprintf(stderr, ":( Connect to server fail.\n");
		exit (1);
	} else {
		fprintf(stdout, ":) Connect to server successfully!\n");
	}
	
	while(1) {
		fprintf(stdout,":> Do you want to send data to server or quit?(s/q)\n");
		ch = read_only_a_char();
		if(ch == 'q') {
			break;
		} else if(ch == 's') {
			if( (send_len=send(sfd,"zhukenan",8,0)) <= 0 ) {
				fprintf(stderr, ":( Send to server fail.\n");
				exit(1);
			} else {
				fprintf(stdout,":) Send to server %d Byte successfully.\n",send_len);
			}
		}
	}

	close(sfd);
	fprintf(stdout, ":) 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;
}