1 /* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
3 * Filesystem handling for the diversion supplementary services.
5 * Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
12 #include <linux/module.h>
13 #include <linux/poll.h>
14 #include <linux/smp_lock.h>
16 #include <linux/proc_fs.h>
20 #include <linux/isdnif.h>
21 #include "isdn_divert.h"
24 /*********************************/
25 /* Variables for interface queue */
26 /*********************************/
27 ulong if_used = 0; /* number of interface users */
28 static struct divert_info *divert_info_head = NULL; /* head of queue */
29 static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
30 static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
31 static wait_queue_head_t rd_queue;
33 /*********************************/
34 /* put an info buffer into queue */
35 /*********************************/
37 put_info_buffer(char *cp)
39 struct divert_info *ib;
48 if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
49 return; /* no memory */
50 strcpy(ib->info_start, cp); /* set output string */
52 spin_lock_irqsave( &divert_info_lock, flags );
53 ib->usage_cnt = if_used;
54 if (!divert_info_head)
55 divert_info_head = ib; /* new head */
57 divert_info_tail->next = ib; /* follows existing messages */
58 divert_info_tail = ib; /* new tail */
60 /* delete old entrys */
61 while (divert_info_head->next) {
62 if ((divert_info_head->usage_cnt <= 0) &&
63 (divert_info_head->next->usage_cnt <= 0)) {
64 ib = divert_info_head;
65 divert_info_head = divert_info_head->next;
69 } /* divert_info_head->next */
70 spin_unlock_irqrestore( &divert_info_lock, flags );
71 wake_up_interruptible(&(rd_queue));
72 } /* put_info_buffer */
74 /**********************************/
75 /* deflection device read routine */
76 /**********************************/
78 isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off)
80 struct divert_info *inf;
83 if (!*((struct divert_info **) file->private_data)) {
84 if (file->f_flags & O_NONBLOCK)
86 interruptible_sleep_on(&(rd_queue));
88 if (!(inf = *((struct divert_info **) file->private_data)))
91 inf->usage_cnt--; /* new usage count */
92 file->private_data = &inf->next; /* next structure */
93 if ((len = strlen(inf->info_start)) <= count) {
94 if (copy_to_user(buf, inf->info_start, len))
100 } /* isdn_divert_read */
102 /**********************************/
103 /* deflection device write routine */
104 /**********************************/
106 isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
109 } /* isdn_divert_write */
112 /***************************************/
113 /* select routines for various kernels */
114 /***************************************/
116 isdn_divert_poll(struct file *file, poll_table * wait)
118 unsigned int mask = 0;
120 poll_wait(file, &(rd_queue), wait);
121 /* mask = POLLOUT | POLLWRNORM; */
122 if (*((struct divert_info **) file->private_data)) {
123 mask |= POLLIN | POLLRDNORM;
126 } /* isdn_divert_poll */
132 isdn_divert_open(struct inode *ino, struct file *filep)
136 spin_lock_irqsave( &divert_info_lock, flags );
138 if (divert_info_head)
139 filep->private_data = &(divert_info_tail->next);
141 filep->private_data = &divert_info_head;
142 spin_unlock_irqrestore( &divert_info_lock, flags );
143 /* start_divert(); */
144 return nonseekable_open(ino, filep);
145 } /* isdn_divert_open */
147 /*******************/
149 /*******************/
151 isdn_divert_close(struct inode *ino, struct file *filep)
153 struct divert_info *inf;
156 spin_lock_irqsave( &divert_info_lock, flags );
158 inf = *((struct divert_info **) filep->private_data);
164 while (divert_info_head) {
165 inf = divert_info_head;
166 divert_info_head = divert_info_head->next;
169 spin_unlock_irqrestore( &divert_info_lock, flags );
171 } /* isdn_divert_close */
177 isdn_divert_ioctl(struct inode *inode, struct file *file,
186 if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
191 dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
195 if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
200 cp = divert_if.drv_to_name(dioctl.getid.drvid);
205 strcpy(dioctl.getid.drvnam, cp);
209 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
211 dioctl.getsetrule.rule = *rulep; /* copy data */
215 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
217 spin_lock_irqsave(&divert_lock, flags);
218 *rulep = dioctl.getsetrule.rule; /* copy data */
219 spin_unlock_irqrestore(&divert_lock, flags);
220 return (0); /* no copy required */
224 return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
228 return (deleterule(dioctl.getsetrule.ruleidx));
232 return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
233 dioctl.fwd_ctrl.callid,
234 dioctl.fwd_ctrl.to_nr));
239 if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
240 return (-EINVAL); /* invalid driver */
241 if ((i = cf_command(dioctl.cf_ctrl.drvid,
242 (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
243 dioctl.cf_ctrl.cfproc,
245 dioctl.cf_ctrl.service,
246 dioctl.cf_ctrl.fwd_nr,
247 &dioctl.cf_ctrl.procid)))
254 return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
255 } /* isdn_divert_ioctl */
258 #ifdef CONFIG_PROC_FS
259 static struct file_operations isdn_fops =
261 .owner = THIS_MODULE,
263 .read = isdn_divert_read,
264 .write = isdn_divert_write,
265 .poll = isdn_divert_poll,
266 .ioctl = isdn_divert_ioctl,
267 .open = isdn_divert_open,
268 .release = isdn_divert_close,
271 /****************************/
272 /* isdn subdir in /proc/net */
273 /****************************/
274 static struct proc_dir_entry *isdn_proc_entry = NULL;
275 static struct proc_dir_entry *isdn_divert_entry = NULL;
276 #endif /* CONFIG_PROC_FS */
278 /***************************************************************************/
279 /* divert_dev_init must be called before the proc filesystem may be used */
280 /***************************************************************************/
282 divert_dev_init(void)
285 init_waitqueue_head(&rd_queue);
287 #ifdef CONFIG_PROC_FS
288 isdn_proc_entry = proc_mkdir("net/isdn", NULL);
289 if (!isdn_proc_entry)
291 isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
292 if (!isdn_divert_entry) {
293 remove_proc_entry("net/isdn", NULL);
296 isdn_divert_entry->proc_fops = &isdn_fops;
297 isdn_divert_entry->owner = THIS_MODULE;
298 #endif /* CONFIG_PROC_FS */
301 } /* divert_dev_init */
303 /***************************************************************************/
304 /* divert_dev_deinit must be called before leaving isdn when included as */
306 /***************************************************************************/
308 divert_dev_deinit(void)
311 #ifdef CONFIG_PROC_FS
312 remove_proc_entry("divert", isdn_proc_entry);
313 remove_proc_entry("net/isdn", NULL);
314 #endif /* CONFIG_PROC_FS */
317 } /* divert_dev_deinit */