void do_fork(int msock)
{
int ssock, clilen;
struct sockaddr_in client_addr;
while(1)
{
printf("Waiting for client connection\n");
ssock = accept(msock ,(struct sockaddr *) &client_addr, &clilen);
if (ssock < 0)
{
printf("server: accept error: %s\n", strerror(errno));
exit(1);
}
switch(fork())
{
case 0:
close(msock);
doftp((void *)(long)ssock);
exit(1);
break;
default:
close(ssock);
break;
case -1:
printf("Failed to fork\n");
exit(1);
}
}
}
int main() {
int sockid, newsd, pid, clilen;
struct sockaddr_in my_addr, client_addr;
printf("server: creating socket\n");
if ((sockid = socket(AF_INET,SOCK_STREAM,0)) < 0)
{
printf("server: socket error : %d\n", errno); exit(0);
}
printf("server: binding my local socket\n");
bzero((char *) &my_addr,sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(MY_PORT_ID);
my_addr.sin_addr.s_addr = htons(INADDR_ANY);
if (bind(sockid ,(struct sockaddr *) &my_addr,sizeof(my_addr)) < 0)
{
printf("server: bind error :%d\n", errno); exit(0);
}
printf("server: starting listen \n");
if (listen(sockid,5) < 0)
{
printf("server: listen error :%d\n",errno);exit(0);
}
while(1==1) {
/* ACCEPT A CONNECTION AND THEN CREATE A CHILD TO DO THE WORK */
/* LOOP BACK AND WAIT FOR ANOTHER CONNECTION */
printf("server: starting accept\n");
if ((newsd = accept(sockid ,(struct sockaddr *) &client_addr,
&clilen)) < 0)
{
printf("server: accept error :%d\n", errno); exit(0);
}
printf("server: return from accept, socket for this ftp: %d\n",
newsd);
if ( (pid=fork()) == 0) {
/* CHILD PROC STARTS HERE. IT WILL DO ACTUAL FILE TRANSFER */
close(sockid); /* child shouldn't do an accept */
doftp(newsd);
close (newsd);
exit(0); /* child all done with work */
}
/* PARENT CONTINUES BELOW HERE */
close(newsd); /* parent all done with client, only child */
} /* will communicate with that client from now on */
}
int main(int argc, char *argv[]) {
int sockfd, newsockfd, portno, n;
pid_t pid;
struct sockaddr_in serv_addr, clt_addr;
socklen_t addrlen;
char buffer[256];
if (argc != 2) {
fprintf(stderr, "Usage: %s <port>\n", argv[0]);
return 1;
}
portno = atoi(argv[1]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
syserr("can't open socket");
printf("create socket...\n");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0)
syserr("can't bind");
printf("bind socket to port %d...\n", portno);
listen(sockfd, 5);
for (;;) {
printf("wait on port %d...\n", portno);
addrlen = sizeof(clt_addr);
newsockfd = accept(sockfd, (struct sockaddr*) &clt_addr, &addrlen);
if (newsockfd < 0)
syserr("can't accept");
if (!(pid = fork())) {
close(sockfd);
doftp(newsockfd);
close(newsockfd);
exit(0);
}
}
close(sockfd);
return 0;
}
