linuxsocket.txt

linux下的简单socket编程,混分的,其实没什么用,大家见谅

Linux socket 编程代码实例
由 zhanjun 在 周五, 2006-03-24 13:20 提交 
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define SIZE 10240
char *site="166.111.107.7";
void printusage()
{
printf("please enter the domain port filename \n \n");
}

int sendfile(const char *ip, char *file, int port){
char buf[SIZE];
int s,k;
struct hostent *hp;
struct sockaddr_in addr;
hp=gethostbyname(ip);
if (hp==NULL)
{
perror( "hostent error" );
return -2;
}

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

}

memset(&addr,0,sizeof(struct sockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
//addr.sin_addr.s_addr=inet_addr(ip);
memcpy(&addr.sin_addr,hp->h_addr_list[0],hp->h_length);
//addr.sin_addr.s_addr= htonl(INADDR_ANY);
printf("正在与服务器%s:%d连接....\n",ip,port);
if(connect(s,( struct sockaddr * )&addr,sizeof(addr))<0){
perror("connect");
exit(1);
}
//recv(s,buf,sizeof(buf),0);
while ( (k=read( s,buf,sizeof(buf) ) ) >0 )
printf("%s\n",buf);

//while(1)
//{}

return 0;
}

int
main(int argc, char* argv[]){
if(argc!=4) printusage();
else
sendfile(argv[1],argv[3],atoi(argv[2]));
return 0;
}

=============================

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define PORT 1234
#define MAXSOCKFD 10
main()
{
int sockfd,newsockfd,is_connected[MAXSOCKFD],fd;
struct sockaddr_in addr;
int addr_len = sizeof(struct sockaddr_in);
fd_set readfds;
char buffer[256];
char msg[ ] ="Welcome to server!";
if ((sockfd = socket(AF_INET,SOCK_STREAM,0))<0){
perror("socket");
exit(1);
}
bzero(&addr,sizeof(addr));
addr.sin_family =AF_INET;
addr.sin_port = htons(PORT);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sockfd,(struct sockaddr *)&addr,sizeof(addr))<0){
perror("connect");
exit(1);
}
if(listen(sockfd,3)<0){
perror("listen");
exit(1);
}
for(fd=0;fd<MAXSOCKFD;fd++)
is_connected[fd]=0;
while(1){
FD_ZERO(&readfds);
FD_SET(sockfd,&readfds);
for(fd=0;fd<MAXSOCKFD;fd++)
if(is_connected[fd]) FD_SET(fd,&readfds);
if(!select(MAXSOCKFD,&readfds,NULL,NULL,NULL))continue;
for(fd=0;fd<MAXSOCKFD;fd++)
if(FD_ISSET(fd,&readfds)){
if(sockfd == fd){
if((newsockfd = accept (sockfd,(struct sockaddr *)&addr,(socklen_t*)&addr_len))<0)
perror("accept");
write(newsockfd,msg,sizeof(msg));
is_connected[newsockfd] =1;
printf("cnnect from %s\n",inet_ntoa(addr.sin_addr));
}else{
bzero(buffer,sizeof(buffer));
if(read(fd,buffer,sizeof(buffer))<=0){
printf("connect closed.\n");
is_connected[fd]=0;
close(fd);
}else
printf("%s",buffer);
}
}
}
}
-====================================
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define SIZE 1024
char *site="166.111.107.7";
void printusage()
{
printf("please enter port and filename \n \n");
}

int sendfile(const char *ip, char *file, int port){

//system("clear");
char buf[SIZE];
int s,k,f,des;
int len=sizeof(struct sockaddr_in);
struct hostent *hp;
struct sockaddr_in addr;
hp=gethostbyname(ip);
if (hp==NULL)
{
perror( "hostent error" );
return -2;
}

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

}

memset(&addr,0,sizeof(struct sockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
//addr.sin_addr.s_addr=inet_addr(ip);
memcpy(&addr.sin_addr,hp->h_addr_list[0],hp->h_length);
//addr.sin_addr.s_addr= htonl(INADDR_ANY);

printf("Server %s:%d 等待连接....\n",ip,port);

if(bind(s,( struct sockaddr * )&addr,sizeof(addr))<0){
perror("bind");
exit(1);
}

if(listen(s,5)<0){
perror("listen ");
exit(5);
}

if ( (f=open(file,O_RDONLY)) < 0 )
{
perror("file open ");
exit(5);
} 

while(1)
{

if( (des=accept(s,(struct sockaddr *)&addr,(socklen_t*)&len)) >=0 ) {
printf(" start %s send to %s ",file,inet_ntoa(addr.sin_addr));
}
else
{
perror("accept");
exit(5);
}

lseek (f,0,SEEK_SET);

//write(des,"welcome to server",20); 

while((k=read(f,buf,sizeof(buf)))>0)
write(des,buf,k); 

close(des);

}

close(f);

// close(s);

return 0;
}

int
main(int argc, char* argv[]){
if(argc!=4) printusage();
else
sendfile(argv[1],argv[3],atoi(argv[2]));
return 0;
}