83 struct filemon {  struct
96 static void filemon_output(struct filemon *filemon, char *msg, size_t len);  argument
98 static __inline struct filemon *
99 filemon_acquire(struct filemon *filemon)  in filemon_acquire()  argument
102 	if (filemon != NULL)  in filemon_acquire()
103 		refcount_acquire(&filemon->refcnt);  in filemon_acquire()
104 	return (filemon);  in filemon_acquire()
111 filemon_release(struct filemon *filemon)  in filemon_release()  argument
114 	if (refcount_release(&filemon->refcnt) == 0)  in filemon_release()
121 	sx_assert(&filemon->lock, SA_UNLOCKED);  in filemon_release()
123 	if (filemon->cred != NULL)  in filemon_release()
124 		crfree(filemon->cred);  in filemon_release()
125 	sx_destroy(&filemon->lock);  in filemon_release()
126 	free(filemon, M_FILEMON);  in filemon_release()
133 static struct filemon *
136 	struct filemon *filemon;  in filemon_proc_get()  local
141 	filemon = filemon_acquire(p->p_filemon);  in filemon_proc_get()
144 	if (filemon == NULL)  in filemon_proc_get()
150 	sx_xlock(&filemon->lock);  in filemon_proc_get()
151 	return (filemon);  in filemon_proc_get()
158 	struct filemon *filemon;  in filemon_proc_drop()  local
164 	filemon = p->p_filemon;  in filemon_proc_drop()
166 	--filemon->proccnt;  in filemon_proc_drop()
173 	KASSERT(filemon->refcnt > 1, ("%s: proc %p dropping filemon %p "  in filemon_proc_drop()
174 	    "with last reference", __func__, p, filemon));  in filemon_proc_drop()
175 	filemon_release(filemon);  in filemon_proc_drop()
180 filemon_drop(struct filemon *filemon)  in filemon_drop()  argument
183 	sx_xunlock(&filemon->lock);  in filemon_drop()
184 	filemon_release(filemon);  in filemon_drop()
190 filemon_write_header(struct filemon *filemon)  in filemon_write_header()  argument
197 	len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr),  in filemon_write_header()
201 	if (len < sizeof(filemon->msgbufr))  in filemon_write_header()
202 		filemon_output(filemon, filemon->msgbufr, len);  in filemon_write_header()
209 filemon_untrack_processes(struct filemon *filemon)  in filemon_untrack_processes()  argument
213 	sx_assert(&filemon->lock, SA_XLOCKED);  in filemon_untrack_processes()
216 	if (filemon->proccnt == 0)  in filemon_untrack_processes()
232 		if (p->p_filemon == filemon)  in filemon_untrack_processes()
242 	KASSERT(filemon->refcnt > 0, ("%s: filemon %p should have "  in filemon_untrack_processes()
243 	    "references still.", __func__, filemon));  in filemon_untrack_processes()
244 	KASSERT(filemon->proccnt == 0, ("%s: filemon %p should not have "  in filemon_untrack_processes()
245 	    "attached procs still.", __func__, filemon));  in filemon_untrack_processes()
252 filemon_close_log(struct filemon *filemon)  in filemon_close_log()  argument
258 	sx_assert(&filemon->lock, SA_XLOCKED);  in filemon_close_log()
259 	if (filemon->fp == NULL)  in filemon_close_log()
264 	len = snprintf(filemon->msgbufr,  in filemon_close_log()
265 	    sizeof(filemon->msgbufr),  in filemon_close_log()
269 	if (len < sizeof(filemon->msgbufr))  in filemon_close_log()
270 		filemon_output(filemon, filemon->msgbufr, len);  in filemon_close_log()
271 	fp = filemon->fp;  in filemon_close_log()
272 	filemon->fp = NULL;  in filemon_close_log()
274 	sx_xunlock(&filemon->lock);  in filemon_close_log()
276 	sx_xlock(&filemon->lock);  in filemon_close_log()
286 	struct filemon *filemon = data;  in filemon_dtr()  local
288 	if (filemon == NULL)  in filemon_dtr()
291 	sx_xlock(&filemon->lock);  in filemon_dtr()
295 	filemon_untrack_processes(filemon);  in filemon_dtr()
296 	filemon_close_log(filemon);  in filemon_dtr()
297 	filemon_drop(filemon);  in filemon_dtr()
302 filemon_attach_proc(struct filemon *filemon, struct proc *p)  in filemon_attach_proc()  argument
304 	struct filemon *filemon2;  in filemon_attach_proc()
306 	sx_assert(&filemon->lock, SA_XLOCKED);  in filemon_attach_proc()
310 	    __func__, filemon, p));  in filemon_attach_proc()
313 	    __func__, filemon, p));  in filemon_attach_proc()
315 	if (p->p_filemon == filemon)  in filemon_attach_proc()
332 		sx_xunlock(&filemon->lock);  in filemon_attach_proc()
339 		sx_xlock(&filemon->lock);  in filemon_attach_proc()
350 	p->p_filemon = filemon_acquire(filemon);  in filemon_attach_proc()
351 	++filemon->proccnt;  in filemon_attach_proc()
360 	struct filemon *filemon;  in filemon_ioctl()  local
365 	if ((error = devfs_get_cdevpriv((void **) &filemon)) != 0)  in filemon_ioctl()
368 	sx_xlock(&filemon->lock);  in filemon_ioctl()
373 		if (filemon->fp != NULL) {  in filemon_ioctl()
389 			filemon->fp = fp;  in filemon_ioctl()
391 			filemon_write_header(filemon);  in filemon_ioctl()
398 		filemon_untrack_processes(filemon);  in filemon_ioctl()
403 			KASSERT(p->p_filemon != filemon,  in filemon_ioctl()
405 			    __func__, p, filemon));  in filemon_ioctl()
406 			error = filemon_attach_proc(filemon, p);  in filemon_ioctl()
416 	sx_xunlock(&filemon->lock);  in filemon_ioctl()
425 	struct filemon *filemon;  in filemon_open()  local
427 	filemon = malloc(sizeof(*filemon), M_FILEMON,  in filemon_open()
429 	sx_init(&filemon->lock, "filemon");  in filemon_open()
430 	refcount_init(&filemon->refcnt, 1);  in filemon_open()
431 	filemon->cred = crhold(td->td_ucred);  in filemon_open()
433 	error = devfs_set_cdevpriv(filemon, filemon_dtr);  in filemon_open()
435 		filemon_release(filemon);  in filemon_open()
445 	struct filemon *filemon;  in filemon_close()  local
448 	if ((error = devfs_get_cdevpriv((void **) &filemon)) != 0)  in filemon_close()
451 	sx_xlock(&filemon->lock);  in filemon_close()
452 	filemon_close_log(filemon);  in filemon_close()
453 	error = filemon->error;  in filemon_close()
454 	sx_xunlock(&filemon->lock);  in filemon_close()
519 DEV_MODULE(filemon, filemon_modevent, NULL);
520 MODULE_VERSION(filemon, 1);