[SERIAL] Clean up and fix tty transmission start/stoping
[linux-2.6] / arch / um / drivers / daemon_kern.c
1 /*
2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
3  * James Leu (jleu@mindspring.net).
4  * Copyright (C) 2001 by various other people who didn't put their name here.
5  * Licensed under the GPL.
6  */
7
8 #include "linux/kernel.h"
9 #include "linux/init.h"
10 #include "linux/netdevice.h"
11 #include "linux/etherdevice.h"
12 #include "net_kern.h"
13 #include "net_user.h"
14 #include "daemon.h"
15
16 struct daemon_init {
17         char *sock_type;
18         char *ctl_sock;
19 };
20
21 void daemon_init(struct net_device *dev, void *data)
22 {
23         struct uml_net_private *pri;
24         struct daemon_data *dpri;
25         struct daemon_init *init = data;
26
27         pri = dev->priv;
28         dpri = (struct daemon_data *) pri->user;
29         dpri->sock_type = init->sock_type;
30         dpri->ctl_sock = init->ctl_sock;
31         dpri->fd = -1;
32         dpri->control = -1;
33         dpri->dev = dev;
34
35         printk("daemon backend (uml_switch version %d) - %s:%s", 
36                SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
37         printk("\n");
38 }
39
40 static int daemon_read(int fd, struct sk_buff **skb, 
41                        struct uml_net_private *lp)
42 {
43         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
44         if(*skb == NULL) return(-ENOMEM);
45         return(net_recvfrom(fd, (*skb)->mac.raw, 
46                             (*skb)->dev->mtu + ETH_HEADER_OTHER));
47 }
48
49 static int daemon_write(int fd, struct sk_buff **skb,
50                         struct uml_net_private *lp)
51 {
52         return(daemon_user_write(fd, (*skb)->data, (*skb)->len, 
53                                  (struct daemon_data *) &lp->user));
54 }
55
56 static struct net_kern_info daemon_kern_info = {
57         .init                   = daemon_init,
58         .protocol               = eth_protocol,
59         .read                   = daemon_read,
60         .write                  = daemon_write,
61 };
62
63 int daemon_setup(char *str, char **mac_out, void *data)
64 {
65         struct daemon_init *init = data;
66         char *remain;
67
68         *init = ((struct daemon_init)
69                 { .sock_type            = "unix",
70                   .ctl_sock             = "/tmp/uml.ctl" });
71         
72         remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
73                                NULL);
74         if(remain != NULL)
75                 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
76                        "specification\n");
77         
78         return(1);
79 }
80
81 static struct transport daemon_transport = {
82         .list           = LIST_HEAD_INIT(daemon_transport.list),
83         .name           = "daemon",
84         .setup          = daemon_setup,
85         .user           = &daemon_user_info,
86         .kern           = &daemon_kern_info,
87         .private_size   = sizeof(struct daemon_data),
88         .setup_size     = sizeof(struct daemon_init),
89 };
90
91 static int register_daemon(void)
92 {
93         register_transport(&daemon_transport);
94         return(1);
95 }
96
97 __initcall(register_daemon);
98
99 /*
100  * Overrides for Emacs so that we follow Linus's tabbing style.
101  * Emacs will notice this stuff at the end of the file and automatically
102  * adjust the settings for this buffer only.  This must remain at the end
103  * of the file.
104  * ---------------------------------------------------------------------------
105  * Local variables:
106  * c-file-style: "linux"
107  * End:
108  */