From a913a5ce2316ee13f24c3dbfadf02d7623ca84dd Mon Sep 17 00:00:00 2001
From: "Kevin P. Fleming" <kpfleming@digium.com>
Date: Fri, 8 Jul 2005 21:15:41 +0000
Subject: [PATCH] add the new files for the last commit :-)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6063 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
devicestate.c | 234 +++++++++++++++++++++++++++++++++
include/asterisk/devicestate.h | 82 ++++++++++++
2 files changed, 316 insertions(+)
create mode 100755 devicestate.c
create mode 100755 include/asterisk/devicestate.h
diff --git a/devicestate.c b/devicestate.c
new file mode 100755
index 0000000000..4641f95490
--- /dev/null
+++ b/devicestate.c
@@ -0,0 +1,234 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Device state management
+ *
+ * Copyright (C) 2005, Digium, Inc.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/channel.h"
+#include "asterisk/utils.h"
+#include "asterisk/lock.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/logger.h"
+#include "asterisk/devicestate.h"
+#include "asterisk/pbx.h"
+#include "asterisk/options.h"
+
+/* ast_devstate_cb: A device state watcher (callback) */
+struct devstate_cb {
+ void *data;
+ ast_devstate_cb_type callback;
+ AST_LIST_ENTRY(devstate_cb) list;
+};
+
+static AST_LIST_HEAD_STATIC(devstate_cbs, devstate_cb);
+
+struct state_change {
+ AST_LIST_ENTRY(state_change) list;
+ char device[1];
+};
+
+static AST_LIST_HEAD_STATIC(state_changes, state_change);
+
+static pthread_t change_thread = AST_PTHREADT_NULL;
+AST_MUTEX_DEFINE_STATIC(change_pending_lock);
+static pthread_cond_t change_pending;
+
+int ast_parse_device_state(const char *device)
+{
+ struct ast_channel *chan;
+ char match[AST_CHANNEL_NAME];
+ int res;
+
+ ast_copy_string(match, device, sizeof(match)-1);
+ strcat(match, "-");
+ chan = ast_get_channel_by_name_prefix_locked(match, strlen(match));
+
+ if (!chan)
+ return AST_DEVICE_UNKNOWN;
+
+ if (chan->_state == AST_STATE_RINGING)
+ res = AST_DEVICE_RINGING;
+ else
+ res = AST_DEVICE_INUSE;
+
+ ast_mutex_unlock(&chan->lock);
+
+ return res;
+}
+
+int ast_device_state(const char *device)
+{
+ char *buf;
+ char *tech;
+ char *number;
+ const struct ast_channel_tech *chan_tech;
+ int res = 0;
+
+ buf = ast_strdupa(device);
+ tech = strsep(&buf, "/");
+ number = buf;
+ if (!number)
+ return AST_DEVICE_INVALID;
+
+ chan_tech = ast_get_channel_tech(tech);
+ if (!chan_tech)
+ return AST_DEVICE_INVALID;
+
+ if (!chan_tech->devicestate)
+ return ast_parse_device_state(device);
+ else {
+ res = chan_tech->devicestate(number);
+ if (res == AST_DEVICE_UNKNOWN)
+ return ast_parse_device_state(device);
+ else
+ return res;
+ }
+}
+
+/*--- ast_devstate_add: Add device state watcher */
+int ast_devstate_add(ast_devstate_cb_type callback, void *data)
+{
+ struct devstate_cb *devcb;
+
+ if (!callback)
+ return -1;
+
+ devcb = calloc(1, sizeof(*devcb));
+ if (!devcb)
+ return -1;
+
+ devcb->data = data;
+ devcb->callback = callback;
+
+ AST_LIST_LOCK(&devstate_cbs);
+ AST_LIST_INSERT_HEAD(&devstate_cbs, devcb, list);
+ AST_LIST_UNLOCK(&devstate_cbs);
+
+ return 0;
+}
+
+/*--- ast_devstate_del: Remove device state watcher */
+void ast_devstate_del(ast_devstate_cb_type callback, void *data)
+{
+ struct devstate_cb *devcb;
+
+ AST_LIST_LOCK(&devstate_cbs);
+ AST_LIST_TRAVERSE_SAFE_BEGIN(&devstate_cbs, devcb, list) {
+ if ((devcb->callback == callback) && (devcb->data == data)) {
+ AST_LIST_REMOVE_CURRENT(&devstate_cbs, list);
+ free(devcb);
+ break;
+ }
+ }
+ AST_LIST_TRAVERSE_SAFE_END;
+ AST_LIST_UNLOCK(&devstate_cbs);
+}
+
+static void do_state_change(const char *device)
+{
+ int state;
+ struct devstate_cb *devcb;
+
+ state = ast_device_state(device);
+ if (option_debug > 2)
+ ast_log(LOG_DEBUG, "Changing state for %s - state %d\n", device, state);
+
+ AST_LIST_LOCK(&devstate_cbs);
+ AST_LIST_TRAVERSE(&devstate_cbs, devcb, list)
+ devcb->callback(device, state, devcb->data);
+ AST_LIST_UNLOCK(&devstate_cbs);
+
+ ast_hint_state_changed(device);
+}
+
+/*--- ast_device_state_changed: Notify callback watchers of change, and notify PBX core for hint updates */
+int ast_device_state_changed(const char *fmt, ...)
+{
+ char buf[AST_MAX_EXTENSION];
+ char *device;
+ char *parse;
+ struct state_change *change = NULL;
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ va_end(ap);
+
+ parse = buf;
+ device = strsep(&parse, "-");
+
+ if (change_thread != AST_PTHREADT_NULL)
+ change = calloc(1, sizeof(*change) + strlen(device));
+
+ if (!change) {
+ /* we could not allocate a change struct, or */
+ /* there is no background thread, so process the change now */
+ do_state_change(device);
+ } else {
+ /* queue the change */
+ strcpy(change->device, device);
+ AST_LIST_LOCK(&state_changes);
+ AST_LIST_INSERT_TAIL(&state_changes, change, list);
+ if (AST_LIST_FIRST(&state_changes) == change) {
+ /* the list was empty, signal the thread */
+ ast_mutex_lock(&change_pending_lock);
+ pthread_cond_signal(&change_pending);
+ ast_mutex_unlock(&change_pending_lock);
+ }
+ AST_LIST_UNLOCK(&state_changes);
+ }
+
+ return 1;
+}
+
+static void *do_changes(void *data)
+{
+ struct state_change *cur;
+
+ for(;;) {
+ ast_mutex_lock(&change_pending_lock);
+ pthread_cond_wait(&change_pending, &change_pending_lock);
+ for (;;) {
+ AST_LIST_LOCK(&state_changes);
+ cur = AST_LIST_REMOVE_HEAD(&state_changes, list);
+ AST_LIST_UNLOCK(&state_changes);
+ if (!cur)
+ break;
+
+ do_state_change(cur->device);
+ free(cur);
+ }
+ ast_mutex_unlock(&change_pending_lock);
+ }
+
+ return NULL;
+}
+
+int ast_device_state_engine_init(void)
+{
+ pthread_attr_t attr;
+
+ pthread_cond_init(&change_pending, NULL);
+ pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ if (ast_pthread_create(&change_thread, &attr, do_changes, NULL) < 0) {
+ ast_log(LOG_ERROR, "Unable to start device state change thread.\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/include/asterisk/devicestate.h b/include/asterisk/devicestate.h
new file mode 100755
index 0000000000..a2dd6fd1f6
--- /dev/null
+++ b/include/asterisk/devicestate.h
@@ -0,0 +1,82 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Device state management
+ *
+ * Copyright (C) 2005, Digium, Inc.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#ifndef _ASTERISK_DEVICESTATE_H
+#define _ASTERISK_DEVICESTATE_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+/*! Device is valid but channel didn't know state */
+#define AST_DEVICE_UNKNOWN 0
+/*! Device is not used */
+#define AST_DEVICE_NOT_INUSE 1
+/*! Device is in use */
+#define AST_DEVICE_INUSE 2
+/*! Device is busy */
+#define AST_DEVICE_BUSY 3
+/*! Device is invalid */
+#define AST_DEVICE_INVALID 4
+/*! Device is unavailable */
+#define AST_DEVICE_UNAVAILABLE 5
+/*! Device is ringing */
+#define AST_DEVICE_RINGING 6
+
+typedef int (*ast_devstate_cb_type)(const char *dev, int state, void *data);
+
+/*! Search the Channels by Name */
+/*!
+ * \param device like a dialstring
+ * Search the Device in active channels by compare the channelname against
+ * the devicename. Compared are only the first chars to the first '-' char.
+ * Returns an AST_DEVICE_UNKNOWN if no channel found or
+ * AST_DEVICE_INUSE if a channel is found
+ */
+int ast_parse_device_state(const char *device);
+
+/*! Asks a channel for device state */
+/*!
+ * \param device like a dialstring
+ * Asks a channel for device state, data is normaly a number from dialstring
+ * used by the low level module
+ * Trys the channel devicestate callback if not supported search in the
+ * active channels list for the device.
+ * Returns an AST_DEVICE_??? state -1 on failure
+ */
+int ast_device_state(const char *device);
+
+/*! Tells Asterisk the State for Device is changed */
+/*!
+ * \param fmt devicename like a dialstring with format parameters
+ * Asterisk polls the new extensionstates and calls the registered
+ * callbacks for the changed extensions
+ * Returns 0 on success, -1 on failure
+ */
+int ast_device_state_changed(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
+
+/*! Registers a device state change callback */
+/*!
+ * \param data to pass to callback
+ * The callback is called if the state for extension is changed
+ * Return -1 on failure, ID on success
+ */
+int ast_devstate_add(ast_devstate_cb_type callback, void *data);
+void ast_devstate_del(ast_devstate_cb_type callback, void *data);
+
+int ast_device_state_engine_init(void);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* _ASTERISK_DEVICESTATE_H */
--
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