by Luiz Augusto von Dentz

[permalink] [raw]

Subject: Re: [PATCH BlueZ 4/4] GATT shim to src/shared bt_att

Hi Michael,

On Tue, Nov 4, 2014 at 11:19 PM, Michael Janssen <[email protected]> wrote:
> This patch implements a version of GAttrib which is backed by
> bt_att, which enables the simultaneous use of GAttrib and bt_att.
>
> This should enable smooth transition of profiles from the GAttrib
> API to the src/shared bt_att API.
> ---
> attrib/gattrib.c | 734 +++++++++++--------------------------------------------
> 1 file changed, 147 insertions(+), 587 deletions(-)
>
> diff --git a/attrib/gattrib.c b/attrib/gattrib.c
> index fa51b6d..63f219d 100644
> --- a/attrib/gattrib.c
> +++ b/attrib/gattrib.c
> @@ -2,8 +2,7 @@
> *
> * BlueZ - Bluetooth protocol stack for Linux
> *
> - * Copyright (C) 2010 Nokia Corporation
> - * Copyright (C) 2010 Marcel Holtmann <[email protected]>
> + * Copyright (C) 2014 Google, Inc.

You got to be super careful with copyright changes, because of that we
usually request this to be in a separate patch, except for newly
created files of course. To speed up this I would suggest you leave
this for later.

> *
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -36,227 +35,124 @@
> #include <bluetooth/bluetooth.h>
>
> #include "btio/btio.h"
> -#include "lib/uuid.h"
> -#include "src/shared/util.h"
> #include "src/log.h"
> -#include "attrib/att.h"
> +#include "src/shared/util.h"
> +#include "src/shared/att.h"
> #include "attrib/gattrib.h"
>
> -#define GATT_TIMEOUT 30
> -
> struct _GAttrib {
> + int ref_count;
> + struct bt_att *att;
> GIOChannel *io;
> - int refs;
> - uint8_t *buf;
> - size_t buflen;
> - guint read_watch;
> - guint write_watch;
> - guint timeout_watch;
> - GQueue *requests;
> - GQueue *responses;
> - GSList *events;
> - guint next_cmd_id;
> GDestroyNotify destroy;
> gpointer destroy_user_data;
> - bool stale;
> + GQueue *callbacks;
> + uint8_t *buf;
> + int buflen;
> };
>
> -struct command {
> - guint id;
> - guint8 opcode;
> - guint8 *pdu;
> - guint16 len;
> - guint8 expected;
> - bool sent;
> - GAttribResultFunc func;
> - gpointer user_data;
> - GDestroyNotify notify;
> -};
>
> -struct event {
> - guint id;
> - guint8 expected;
> - guint16 handle;
> - GAttribNotifyFunc func;
> +struct attrib_callbacks {
> + GAttribResultFunc result_func;
> + GAttribNotifyFunc notify_func;
> + GDestroyNotify destroy_func;
> gpointer user_data;
> - GDestroyNotify notify;
> + GAttrib *parent;
> + uint16_t notify_handle;
> };
>
> -static guint8 opcode2expected(guint8 opcode)
> +GAttrib *g_attrib_new(GIOChannel *io, guint16 mtu)
> {
> - switch (opcode) {
> - case ATT_OP_MTU_REQ:
> - return ATT_OP_MTU_RESP;
> -
> - case ATT_OP_FIND_INFO_REQ:
> - return ATT_OP_FIND_INFO_RESP;
> -
> - case ATT_OP_FIND_BY_TYPE_REQ:
> - return ATT_OP_FIND_BY_TYPE_RESP;
> -
> - case ATT_OP_READ_BY_TYPE_REQ:
> - return ATT_OP_READ_BY_TYPE_RESP;
> -
> - case ATT_OP_READ_REQ:
> - return ATT_OP_READ_RESP;
> -
> - case ATT_OP_READ_BLOB_REQ:
> - return ATT_OP_READ_BLOB_RESP;
> -
> - case ATT_OP_READ_MULTI_REQ:
> - return ATT_OP_READ_MULTI_RESP;
> + gint fd;
> + GAttrib *attr;
>
> - case ATT_OP_READ_BY_GROUP_REQ:
> - return ATT_OP_READ_BY_GROUP_RESP;
> + if (!io)
> + return NULL;
>
> - case ATT_OP_WRITE_REQ:
> - return ATT_OP_WRITE_RESP;
> + fd = g_io_channel_unix_get_fd(io);
> + attr = new0(GAttrib, 1);
> + if (!attr)
> + return NULL;
>
> - case ATT_OP_PREP_WRITE_REQ:
> - return ATT_OP_PREP_WRITE_RESP;
> + g_io_channel_ref(io);
> + attr->io = io;
>
> - case ATT_OP_EXEC_WRITE_REQ:
> - return ATT_OP_EXEC_WRITE_RESP;
> + attr->att = bt_att_new(fd);
> + if (!attr->att)
> + goto fail;
>
> - case ATT_OP_HANDLE_IND:
> - return ATT_OP_HANDLE_CNF;
> - }
> + attr->buf = g_malloc0(mtu);
> + attr->buflen = mtu;
> + if (!attr->buf)
> + goto fail;
>
> - return 0;
> -}
> + attr->callbacks = g_queue_new();
> + if (!attr->callbacks)
> + goto fail;
>
> -static bool is_response(guint8 opcode)
> -{
> - switch (opcode) {
> - case ATT_OP_ERROR:
> - case ATT_OP_MTU_RESP:
> - case ATT_OP_FIND_INFO_RESP:
> - case ATT_OP_FIND_BY_TYPE_RESP:
> - case ATT_OP_READ_BY_TYPE_RESP:
> - case ATT_OP_READ_RESP:
> - case ATT_OP_READ_BLOB_RESP:
> - case ATT_OP_READ_MULTI_RESP:
> - case ATT_OP_READ_BY_GROUP_RESP:
> - case ATT_OP_WRITE_RESP:
> - case ATT_OP_PREP_WRITE_RESP:
> - case ATT_OP_EXEC_WRITE_RESP:
> - case ATT_OP_HANDLE_CNF:
> - return true;
> - }
> + return g_attrib_ref(attr);
>
> - return false;
> -}
> -
> -static bool is_request(guint8 opcode)
> -{
> - switch (opcode) {
> - case ATT_OP_MTU_REQ:
> - case ATT_OP_FIND_INFO_REQ:
> - case ATT_OP_FIND_BY_TYPE_REQ:
> - case ATT_OP_READ_BY_TYPE_REQ:
> - case ATT_OP_READ_REQ:
> - case ATT_OP_READ_BLOB_REQ:
> - case ATT_OP_READ_MULTI_REQ:
> - case ATT_OP_READ_BY_GROUP_REQ:
> - case ATT_OP_WRITE_REQ:
> - case ATT_OP_WRITE_CMD:
> - case ATT_OP_PREP_WRITE_REQ:
> - case ATT_OP_EXEC_WRITE_REQ:
> - return true;
> - }
> -
> - return false;
> +fail:
> + free(attr->buf);
> + bt_att_unref(attr->att);
> + g_io_channel_unref(io);
> + free(attr);
> + return NULL;
> }
>
> GAttrib *g_attrib_ref(GAttrib *attrib)
> {
> - int refs;
> -
> if (!attrib)
> return NULL;
>
> - refs = __sync_add_and_fetch(&attrib->refs, 1);
> + __sync_fetch_and_add(&attrib->ref_count, 1);
>
> - DBG("%p: ref=%d", attrib, refs);
> + DBG("%p: g_attrib_ref=%d ", attrib, attrib->ref_count);
>
> return attrib;
> }
>
> -static void command_destroy(struct command *cmd)
> +static void attrib_callbacks_destroy(void *user_data)
> {
> - if (cmd->notify)
> - cmd->notify(cmd->user_data);
> + struct attrib_callbacks *cb;
>
> - g_free(cmd->pdu);
> - g_free(cmd);
> -}
> + cb = (struct attrib_callbacks *)user_data;
> + if (!user_data || !g_queue_remove(cb->parent->callbacks, user_data))
> + return;
>
> -static void event_destroy(struct event *evt)
> -{
> - if (evt->notify)
> - evt->notify(evt->user_data);
> + if (cb->destroy_func)
> + cb->destroy_func(cb->user_data);
>
> - g_free(evt);
> + free(user_data);
> }
>
> -static void attrib_destroy(GAttrib *attrib)
> +void g_attrib_unref(GAttrib *attrib)
> {
> - GSList *l;
> - struct command *c;
> -
> - while ((c = g_queue_pop_head(attrib->requests)))
> - command_destroy(c);
> -
> - while ((c = g_queue_pop_head(attrib->responses)))
> - command_destroy(c);
> -
> - g_queue_free(attrib->requests);
> - attrib->requests = NULL;
> -
> - g_queue_free(attrib->responses);
> - attrib->responses = NULL;
> + struct attrib_callbacks *cb;
>
> - for (l = attrib->events; l; l = l->next)
> - event_destroy(l->data);
> -
> - g_slist_free(attrib->events);
> - attrib->events = NULL;
> -
> - if (attrib->timeout_watch > 0)
> - g_source_remove(attrib->timeout_watch);
> -
> - if (attrib->write_watch > 0)
> - g_source_remove(attrib->write_watch);
> -
> - if (attrib->read_watch > 0)
> - g_source_remove(attrib->read_watch);
> + if (!attrib)
> + return;
>
> - if (attrib->io)
> - g_io_channel_unref(attrib->io);
> + DBG("%p: g_attrib_unref=%d ", attrib, attrib->ref_count-1);
>
> - g_free(attrib->buf);
> + if (__sync_sub_and_fetch(&attrib->ref_count, 1))
> + return;
>
> if (attrib->destroy)
> attrib->destroy(attrib->destroy_user_data);
>
> - g_free(attrib);
> -}
> + while ((cb = g_queue_peek_head(attrib->callbacks)))
> + attrib_callbacks_destroy(cb);
>
> -void g_attrib_unref(GAttrib *attrib)
> -{
> - int refs;
> + g_queue_free(attrib->callbacks);
>
> - if (!attrib)
> - return;
> -
> - refs = __sync_sub_and_fetch(&attrib->refs, 1);
> + g_free(attrib->buf);
>
> - DBG("%p: ref=%d", attrib, refs);
> + bt_att_unref(attrib->att);
>
> - if (refs > 0)
> - return;
> + g_io_channel_unref(attrib->io);
>
> - attrib_destroy(attrib);
> + g_free(attrib);
> }
>
> GIOChannel *g_attrib_get_channel(GAttrib *attrib)
> @@ -270,7 +166,7 @@ GIOChannel *g_attrib_get_channel(GAttrib *attrib)
> gboolean g_attrib_set_destroy_function(GAttrib *attrib,
> GDestroyNotify destroy, gpointer user_data)
> {
> - if (attrib == NULL)
> + if (!attrib)
> return FALSE;
>
> attrib->destroy = destroy;
> @@ -279,380 +175,116 @@ gboolean g_attrib_set_destroy_function(GAttrib *attrib,
> return TRUE;
> }
>
> -static gboolean disconnect_timeout(gpointer data)
> -{
> - struct _GAttrib *attrib = data;
> - struct command *c;
> -
> - g_attrib_ref(attrib);
> -
> - c = g_queue_pop_head(attrib->requests);
> - if (c == NULL)
> - goto done;
> -
> - if (c->func)
> - c->func(ATT_ECODE_TIMEOUT, NULL, 0, c->user_data);
> -
> - command_destroy(c);
> -
> - while ((c = g_queue_pop_head(attrib->requests))) {
> - if (c->func)
> - c->func(ATT_ECODE_ABORTED, NULL, 0, c->user_data);
> - command_destroy(c);
> - }
> -
> -done:
> - attrib->stale = true;
> -
> - g_attrib_unref(attrib);
> -
> - return FALSE;
> -}
> -
> -static gboolean can_write_data(GIOChannel *io, GIOCondition cond,
> - gpointer data)
> -{
> - struct _GAttrib *attrib = data;
> - struct command *cmd;
> - GError *gerr = NULL;
> - gsize len;
> - GIOStatus iostat;
> - GQueue *queue;
> -
> - if (attrib->stale)
> - return FALSE;
> -
> - if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL))
> - return FALSE;
> -
> - queue = attrib->responses;
> - cmd = g_queue_peek_head(queue);
> - if (cmd == NULL) {
> - queue = attrib->requests;
> - cmd = g_queue_peek_head(queue);
> - }
> - if (cmd == NULL)
> - return FALSE;
> -
> - /*
> - * Verify that we didn't already send this command. This can only
> - * happen with elementes from attrib->requests.
> - */
> - if (cmd->sent)
> - return FALSE;
> -
> - iostat = g_io_channel_write_chars(io, (char *) cmd->pdu, cmd->len,
> - &len, &gerr);
> - if (iostat != G_IO_STATUS_NORMAL) {
> - if (gerr) {
> - error("%s", gerr->message);
> - g_error_free(gerr);
> - }
> -
> - return FALSE;
> - }
> -
> - if (cmd->expected == 0) {
> - g_queue_pop_head(queue);
> - command_destroy(cmd);
>
> - return TRUE;
> - }
> -
> - cmd->sent = true;
> -
> - if (attrib->timeout_watch == 0)
> - attrib->timeout_watch = g_timeout_add_seconds(GATT_TIMEOUT,
> - disconnect_timeout, attrib);
> -
> - return FALSE;
> -}
> -
> -static void destroy_sender(gpointer data)
> +static void attrib_callback_result(uint8_t opcode, const void *pdu,
> + uint16_t length, void *user_data)
> {
> - struct _GAttrib *attrib = data;
> -
> - attrib->write_watch = 0;
> - g_attrib_unref(attrib);
> -}
> + uint8_t *buf;
> + struct attrib_callbacks *cb = user_data;
>
> -static void wake_up_sender(struct _GAttrib *attrib)
> -{
> - if (attrib->write_watch > 0)
> + if (!cb)
> return;
>
> - attrib = g_attrib_ref(attrib);
> - attrib->write_watch = g_io_add_watch_full(attrib->io,
> - G_PRIORITY_DEFAULT, G_IO_OUT,
> - can_write_data, attrib, destroy_sender);
> -}
> -
> -static bool match_event(struct event *evt, const uint8_t *pdu, gsize len)
> -{
> - guint16 handle;
> -
> - if (is_request(pdu[0]) && evt->expected == GATTRIB_ALL_REQS)
> - return true;
> -
> - if (evt->expected == pdu[0] && evt->handle == GATTRIB_ALL_HANDLES)
> - return true;
> -
> - if (len < 3)
> - return false;
> + buf = g_malloc0(length+1);
> + if (!buf)
> + return;
>
> - handle = get_le16(&pdu[1]);
> + buf[0] = opcode;
> + memcpy(buf+1, pdu, length);
>
> - if (evt->expected == pdu[0] && evt->handle == handle)
> - return true;
> + if (cb->result_func)
> + cb->result_func(0, buf, length+1, cb->user_data);
>
> - return false;
> + g_free(buf);
> }
>
> -static gboolean received_data(GIOChannel *io, GIOCondition cond, gpointer data)
> -{
> - struct _GAttrib *attrib = data;
> - struct command *cmd = NULL;
> - GSList *l;
> - uint8_t buf[512], status;
> - gsize len;
> - GIOStatus iostat;
> -
> - if (attrib->stale)
> - return FALSE;
> -
> - if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL)) {
> - struct command *c;
> -
> - while ((c = g_queue_pop_head(attrib->requests))) {
> - if (c->func)
> - c->func(ATT_ECODE_IO, NULL, 0, c->user_data);
> - command_destroy(c);
> - }
> -
> - attrib->read_watch = 0;
> -
> - return FALSE;
> - }
> -
> - memset(buf, 0, sizeof(buf));
>
> - iostat = g_io_channel_read_chars(io, (char *) buf, sizeof(buf),
> - &len, NULL);
> - if (iostat != G_IO_STATUS_NORMAL) {
> - status = ATT_ECODE_IO;
> - goto done;
> - }
> -
> - for (l = attrib->events; l; l = l->next) {
> - struct event *evt = l->data;
> -
> - if (match_event(evt, buf, len))
> - evt->func(buf, len, evt->user_data);
> - }
> -
> - if (!is_response(buf[0]))
> - return TRUE;
> -
> - if (attrib->timeout_watch > 0) {
> - g_source_remove(attrib->timeout_watch);
> - attrib->timeout_watch = 0;
> - }
> -
> - cmd = g_queue_pop_head(attrib->requests);
> - if (cmd == NULL) {
> - /* Keep the watch if we have events to report */
> - return attrib->events != NULL;
> - }
> -
> - if (buf[0] == ATT_OP_ERROR) {
> - status = buf[4];
> - goto done;
> - }
> -
> - if (cmd->expected != buf[0]) {
> - status = ATT_ECODE_IO;
> - goto done;
> - }
> -
> - status = 0;
> -
> -done:
> - if (!g_queue_is_empty(attrib->requests) ||
> - !g_queue_is_empty(attrib->responses))
> - wake_up_sender(attrib);
> -
> - if (cmd) {
> - if (cmd->func)
> - cmd->func(status, buf, len, cmd->user_data);
> -
> - command_destroy(cmd);
> - }
> +static void attrib_callback_notify(uint8_t opcode, const void *pdu,
> + uint16_t length, void *user_data)
> +{
> + uint8_t *buf;
> + struct attrib_callbacks *cb = user_data;
>
> - return TRUE;
> -}
> + if (!cb)
> + return;
>
> -GAttrib *g_attrib_new(GIOChannel *io, guint16 mtu)
> -{
> - struct _GAttrib *attrib;
> + if (cb->notify_func == NULL)
> + return;
>
> - g_io_channel_set_encoding(io, NULL, NULL);
> - g_io_channel_set_buffered(io, FALSE);
> + if (cb->notify_handle != GATTRIB_ALL_HANDLES && length < 2)
> + return;
>
> - attrib = g_try_new0(struct _GAttrib, 1);
> - if (attrib == NULL)
> - return NULL;
> + if (cb->notify_handle != GATTRIB_ALL_HANDLES &&
> + cb->notify_handle != get_le16(pdu))
> + return;
>
> - attrib->buf = g_malloc0(mtu);
> - attrib->buflen = mtu;
> + buf = g_malloc0(length+1);
> + if (!buf)
> + return;
>
> - attrib->io = g_io_channel_ref(io);
> - attrib->requests = g_queue_new();
> - attrib->responses = g_queue_new();
> + buf[0] = opcode;
> + memcpy(buf+1, pdu, length);
>
> - attrib->read_watch = g_io_add_watch(attrib->io,
> - G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
> - received_data, attrib);
> + cb->notify_func(buf, length+1, cb->user_data);
>
> - return g_attrib_ref(attrib);
> + g_free(buf);
> }
>
> guint g_attrib_send(GAttrib *attrib, guint id, const guint8 *pdu, guint16 len,
> GAttribResultFunc func, gpointer user_data,
> GDestroyNotify notify)
> {
> - struct command *c;
> - GQueue *queue;
> - uint8_t opcode;
> -
> - if (attrib->stale)
> - return 0;
> -
> - c = g_try_new0(struct command, 1);
> - if (c == NULL)
> - return 0;
> -
> - opcode = pdu[0];
> -
> - c->opcode = opcode;
> - c->expected = opcode2expected(opcode);
> - c->pdu = g_malloc(len);
> - memcpy(c->pdu, pdu, len);
> - c->len = len;
> - c->func = func;
> - c->user_data = user_data;
> - c->notify = notify;
> -
> - if (is_response(opcode))
> - queue = attrib->responses;
> - else
> - queue = attrib->requests;
> -
> - if (id) {
> - c->id = id;
> - if (!is_response(opcode))
> - g_queue_push_head(queue, c);
> - else
> - /* Don't re-order responses even if an ID is given */
> - g_queue_push_tail(queue, c);
> - } else {
> - c->id = ++attrib->next_cmd_id;
> - g_queue_push_tail(queue, c);
> + struct attrib_callbacks *cb = NULL;
> + bt_att_response_func_t response_cb = NULL;
> + bt_att_destroy_func_t destroy_cb = NULL;
> +
> + if (func || notify) {
> + cb = new0(struct attrib_callbacks, 1);
> + if (cb == 0)
> + return 0;
> + cb->result_func = func;
> + cb->user_data = user_data;
> + cb->destroy_func = notify;
> + cb->parent = attrib;
> + g_queue_push_head(attrib->callbacks, cb);
> + response_cb = attrib_callback_result;
> + destroy_cb = attrib_callbacks_destroy;
> }
>
> - /*
> - * If a command was added to the queue and it was empty before, wake up
> - * the sender. If the sender was already woken up by the second queue,
> - * wake_up_sender will just return.
> - */
> - if (g_queue_get_length(queue) == 1)
> - wake_up_sender(attrib);
> -
> - return c->id;
> -}
> -
> -static int command_cmp_by_id(gconstpointer a, gconstpointer b)
> -{
> - const struct command *cmd = a;
> - guint id = GPOINTER_TO_UINT(b);
> -
> - return cmd->id - id;
> + return bt_att_send(attrib->att, pdu[0], (void *)pdu+1, len-1,
> + response_cb, cb, destroy_cb);
> }
>
> gboolean g_attrib_cancel(GAttrib *attrib, guint id)
> {
> - GList *l = NULL;
> - struct command *cmd;
> - GQueue *queue;
> -
> - if (attrib == NULL)
> - return FALSE;
> -
> - queue = attrib->requests;
> - if (queue)
> - l = g_queue_find_custom(queue, GUINT_TO_POINTER(id),
> - command_cmp_by_id);
> - if (l == NULL) {
> - queue = attrib->responses;
> - if (!queue)
> - return FALSE;
> - l = g_queue_find_custom(queue, GUINT_TO_POINTER(id),
> - command_cmp_by_id);
> - }
> -
> - if (l == NULL)
> - return FALSE;
> -
> - cmd = l->data;
> -
> - if (cmd == g_queue_peek_head(queue) && cmd->sent)
> - cmd->func = NULL;
> - else {
> - g_queue_remove(queue, cmd);
> - command_destroy(cmd);
> - }
> -
> - return TRUE;
> + return bt_att_cancel(attrib->att, id);
> }
>
> -static gboolean cancel_all_per_queue(GQueue *queue)
> +gboolean g_attrib_cancel_all(GAttrib *attrib)
> {
> - struct command *c, *head = NULL;
> - gboolean first = TRUE;
> -
> - if (queue == NULL)
> - return FALSE;
> -
> - while ((c = g_queue_pop_head(queue))) {
> - if (first && c->sent) {
> - /* If the command was sent ignore its callback ... */
> - c->func = NULL;
> - head = c;
> - continue;
> - }
> -
> - first = FALSE;
> - command_destroy(c);
> - }
> -
> - if (head) {
> - /* ... and put it back in the queue */
> - g_queue_push_head(queue, head);
> - }
> -
> - return TRUE;
> + return bt_att_cancel_all(attrib->att);
> }
>
> -gboolean g_attrib_cancel_all(GAttrib *attrib)
> +guint g_attrib_register(GAttrib *attrib, guint8 opcode, guint16 handle,
> + GAttribNotifyFunc func, gpointer user_data,
> + GDestroyNotify notify)
> {
> - gboolean ret;
> -
> - if (attrib == NULL)
> - return FALSE;
> -
> - ret = cancel_all_per_queue(attrib->requests);
> - ret = cancel_all_per_queue(attrib->responses) && ret;
> + struct attrib_callbacks *cb = NULL;
> +
> + if (func || notify) {
> + cb = new0(struct attrib_callbacks, 1);
> + if (cb == 0)
> + return 0;
> + cb->notify_func = func;
> + cb->notify_handle = handle;
> + cb->user_data = user_data;
> + cb->destroy_func = notify;
> + cb->parent = attrib;
> + g_queue_push_head(attrib->callbacks, cb);
> + }
>
> - return ret;
> + return bt_att_register(attrib->att, opcode, attrib_callback_notify,
> + cb, attrib_callbacks_destroy);
> }
>
> uint8_t *g_attrib_get_buffer(GAttrib *attrib, size_t *len)
> @@ -661,98 +293,26 @@ uint8_t *g_attrib_get_buffer(GAttrib *attrib, size_t *len)
> return NULL;
>
> *len = attrib->buflen;
> -
> return attrib->buf;
> }
>
> gboolean g_attrib_set_mtu(GAttrib *attrib, int mtu)
> {
> - if (mtu < ATT_DEFAULT_LE_MTU)
> - return FALSE;
> -
> - attrib->buf = g_realloc(attrib->buf, mtu);
> -
> - attrib->buflen = mtu;
> -
> - return TRUE;
> -}
> -
> -guint g_attrib_register(GAttrib *attrib, guint8 opcode, guint16 handle,
> - GAttribNotifyFunc func, gpointer user_data,
> - GDestroyNotify notify)
> -{
> - static guint next_evt_id = 0;
> - struct event *event;
> -
> - event = g_try_new0(struct event, 1);
> - if (event == NULL)
> - return 0;
> -
> - event->expected = opcode;
> - event->handle = handle;
> - event->func = func;
> - event->user_data = user_data;
> - event->notify = notify;
> - event->id = ++next_evt_id;
> -
> - attrib->events = g_slist_append(attrib->events, event);
> -
> - return event->id;
> -}
> -
> -static int event_cmp_by_id(gconstpointer a, gconstpointer b)
> -{
> - const struct event *evt = a;
> - guint id = GPOINTER_TO_UINT(b);
> + /* Clients of this expect a buffer to use. */
> + if (mtu > attrib->buflen) {
> + attrib->buf = g_realloc(attrib->buf, mtu);
> + attrib->buflen = mtu;
> + }
>
> - return evt->id - id;
> + return bt_att_set_mtu(attrib->att, mtu);
> }
>
> gboolean g_attrib_unregister(GAttrib *attrib, guint id)
> {
> - struct event *evt;
> - GSList *l;
> -
> - if (id == 0) {
> - warn("%s: invalid id", __func__);
> - return FALSE;
> - }
> -
> - l = g_slist_find_custom(attrib->events, GUINT_TO_POINTER(id),
> - event_cmp_by_id);
> - if (l == NULL)
> - return FALSE;
> -
> - evt = l->data;
> -
> - attrib->events = g_slist_remove(attrib->events, evt);
> -
> - if (evt->notify)
> - evt->notify(evt->user_data);
> -
> - g_free(evt);
> -
> - return TRUE;
> + return bt_att_unregister(attrib->att, id);
> }
>
> gboolean g_attrib_unregister_all(GAttrib *attrib)
> {
> - GSList *l;
> -
> - if (attrib->events == NULL)
> - return FALSE;
> -
> - for (l = attrib->events; l; l = l->next) {
> - struct event *evt = l->data;
> -
> - if (evt->notify)
> - evt->notify(evt->user_data);
> -
> - g_free(evt);
> - }
> -
> - g_slist_free(attrib->events);
> - attrib->events = NULL;
> -
> - return TRUE;
> + return bt_att_unregister_all(attrib->att);
> }
> --
> 2.1.0.rc2.206.gedb03e5
>
> --
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--
Luiz Augusto von Dentz