Date: Sat, 15 Sep 2001 19:49:17 -0500 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: freebsd-hackers@FreeBSD.ORG Subject: Could not bind Message-ID: <3BA3F70D.27C2136@math.missouri.edu>
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I have written a server program that listens on port 3000. The program
works very well except for one feature. I am asking if that is normal,
or whether I forgot something.
If I run the program it does fine. If I then kill the program (after it
has accepted connections), and then run the program again, the bind
function fails to work, and I get a message like "Could not bind" (see
program below). If I wait a while, like a minute or two, then the
program will work again. Is this normal behavior, or did I miss
something?
I got the programming style from Richard Steven's book on network
programming. The structure of the program is something like this:
typedef struct {
int connfd;
struct in_addr addr;
u_short port;
}
arg_pass_type;
void *process_client(void *arg) {
int connfd = ((arg_pass_type*)arg)->connfd;
struct in_addr addr = ((arg_pass_type*)arg)->addr;
u_short port = ((arg_pass_type*)arg)->port;
free(arg);
pthread_detach(pthread_self());
do_lots_of_stuff();
}
int main () {
int listenfd;
struct sockaddr_in servaddr;
socklen_t slen;
pthread_t tid;
arg_pass_type *arg;
listenfd=socket(AF_INET,SOCK_STREAM,0);
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
servaddr.sin_port=htons(3000);
if (bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) < 0)
{
fprintf(stderr,"Could not bind\n");
exit(1);
}
listen(listenfd,6);
while (1)
{
slen=sizeof(servaddr);
arg = malloc(sizeof(arg_pass_type));
arg->connfd = accept(listenfd,(struct sockaddr*)&servaddr,&slen);
arg->addr = servaddr.sin_addr;
arg->port = servaddr.sin_port;
pthread_create(&tid,NULL,process_client,(void*) arg);
}
exit(0);
}
--
Stephen Montgomery-Smith
stephen@math.missouri.edu
http://www.math.missouri.edu/~stephen
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