Hello,
The following module creates a UDP kernel socket which calls sock_recvms.
after insmoding the module ,
netstat -nl | grep 4000 shows that indeed a socket was created and that it
listens on port 4000.
However, after running rmmod on the module, it does **not** close the socket.
netstat -nl | grep 4000 shows that it **does** exist; the "rmmod"
itself hangs, and
there are no kernel messages.
Any ideas?
The code of the module is below:
static int createUdpInSocket(void)
{
int res;
struct sockaddr_in server;
int servererror;
unsigned char *buf;
printk( KERN_ERR "createUdpInSocket\n" );
if( sock_create( PF_INET,SOCK_DGRAM,IPPROTO_UDP,&udpInserversocket)<0 )
{
printk(KERN_ERR "server: Error creating udpserversocket.\n" );
return -EIO;
}
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons((unsigned short)4000);
servererror = udpInserversocket->ops->bind(udpInserversocket,
(struct sockaddr *) &server, sizeof(server) );
{
struct msghdr msg;
struct iovec iov;
mm_segment_t oldfs;
int size = 0;
int len = 160;
iov.iov_base = buf;
msg.msg_flags = 0;
msg.msg_name = &server;
msg.msg_namelen = sizeof(struct sockaddr_in);
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
oldfs = get_fs();
set_fs(KERNEL_DS);
printk("before sock_recvmsg in %s %s\n",__FUNCTION__,__FILE__);
size = sock_recvmsg(udpInserversocket,&msg,len,msg.msg_flags);
printk("after sock_recvmsg in %s %s\n",__FUNCTION__,__FILE__);
set_fs(oldfs);
}
}
static int kernThread(void *arg)
{
allow_signal(SIGKILL);
createUdpInSocket();
return 0;
}
static int __init nic_init(void)
{
int ret;
void *kdata;
p = kthread_run(kernThread,kdata,"myKernThread");
return 0;
}
//////////////////////////////////////////////////////////////////////////////
static void __exit nic_exit(void)
{
printk("in nic_exit\n");
if (p)
kthread_stop(p);
if (udpInserversocket)
sock_release(udpInserversocket);
}
//////////////////////////////////////////////////////////////////////////////
module_init(nic_init)
module_exit(nic_exit)
Regards,
Mark Ryden
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