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*
* AT chat library with GLib integration
*
* Copyright (C) 2008-2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <glib.h>
#include "ringbuffer.h"
#include "gatio.h"
#include "gatutil.h"
struct _GAtIO {
gint ref_count; /* Ref count */
guint read_watch; /* GSource read id, 0 if no */
guint write_watch; /* GSource write id, 0 if no */
GIOChannel *channel; /* comms channel */
GAtDisconnectFunc user_disconnect; /* user disconnect func */
gpointer user_disconnect_data; /* user disconnect data */
struct ring_buffer *buf; /* Current read buffer */
guint max_read_attempts; /* max reads / select */
GAtIOReadFunc read_handler; /* Read callback */
gpointer read_data; /* Read callback userdata */
gboolean use_write_watch; /* Use write select */
GAtIOWriteFunc write_handler; /* Write callback */
gpointer write_data; /* Write callback userdata */
GAtDebugFunc debugf; /* debugging output function */
gpointer debug_data; /* Data to pass to debug func */
GAtDisconnectFunc write_done_func; /* tx empty notifier */
gpointer write_done_data; /* tx empty data */
gboolean destroyed; /* Re-entrancy guard */
};
static void read_watcher_destroy_notify(gpointer user_data)
{
GAtIO *io = user_data;
ring_buffer_free(io->buf);
io->buf = NULL;
io->debugf = NULL;
io->debug_data = NULL;
io->read_watch = 0;
io->read_handler = NULL;
io->read_data = NULL;
io->channel = NULL;
if (io->destroyed)
g_free(io);
else if (io->user_disconnect)
io->user_disconnect(io->user_disconnect_data);
}
static gboolean received_data(GIOChannel *channel, GIOCondition cond,
gpointer data)
{
unsigned char *buf;
GAtIO *io = data;
GIOStatus status;
gsize rbytes;
gsize toread;
gsize total_read = 0;
guint read_count = 0;
if (cond & G_IO_NVAL)
return FALSE;
/* Regardless of condition, try to read all the data available */
do {
toread = ring_buffer_avail_no_wrap(io->buf);
if (toread == 0)
break;
rbytes = 0;
buf = ring_buffer_write_ptr(io->buf, 0);
status = g_io_channel_read_chars(channel, (char *) buf,
toread, &rbytes, NULL);
g_at_util_debug_chat(TRUE, (char *)buf, rbytes,
io->debugf, io->debug_data);
read_count++;
total_read += rbytes;
if (rbytes > 0)
ring_buffer_write_advance(io->buf, rbytes);
} while (status == G_IO_STATUS_NORMAL && rbytes > 0 &&
read_count < io->max_read_attempts);
if (total_read > 0 && io->read_handler)
io->read_handler(io->buf, io->read_data);
if (cond & (G_IO_HUP | G_IO_ERR))
return FALSE;
if (read_count > 0 && rbytes == 0 && status != G_IO_STATUS_AGAIN)
return FALSE;
/* We're overflowing the buffer, shutdown the socket */
if (ring_buffer_avail(io->buf) == 0)
return FALSE;
return TRUE;
}
gsize g_at_io_write(GAtIO *io, const gchar *data, gsize count)
{
GIOStatus status;
gsize bytes_written;
status = g_io_channel_write_chars(io->channel, data,
count, &bytes_written, NULL);
if (status != G_IO_STATUS_NORMAL) {
g_source_remove(io->read_watch);
return 0;
}
g_at_util_debug_chat(FALSE, data, bytes_written,
io->debugf, io->debug_data);
return bytes_written;
}
static void write_watcher_destroy_notify(gpointer user_data)
{
GAtIO *io = user_data;
io->write_watch = 0;
io->write_handler = NULL;
io->write_data = NULL;
if (io->write_done_func) {
io->write_done_func(io->write_done_data);
io->write_done_func = NULL;
io->write_done_data = NULL;
}
}
static gboolean can_write_data(GIOChannel *channel, GIOCondition cond,
gpointer data)
{
GAtIO *io = data;
if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR))
return FALSE;
if (io->write_handler == NULL)
return FALSE;
return io->write_handler(io->write_data);
}
static GAtIO *create_io(GIOChannel *channel, GIOFlags flags)
{
GAtIO *io;
if (channel == NULL)
return NULL;
io = g_try_new0(GAtIO, 1);
if (io == NULL)
return io;
io->ref_count = 1;
io->debugf = NULL;
if (flags & G_IO_FLAG_NONBLOCK) {
io->max_read_attempts = 3;
io->use_write_watch = TRUE;
} else {
io->max_read_attempts = 1;
io->use_write_watch = FALSE;
}
io->buf = ring_buffer_new(8192);
if (!io->buf)
goto error;
if (!g_at_util_setup_io(channel, flags))
goto error;
io->channel = channel;
io->read_watch = g_io_add_watch_full(channel, G_PRIORITY_DEFAULT,
G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
received_data, io,
read_watcher_destroy_notify);
return io;
error:
if (io->buf)
ring_buffer_free(io->buf);
g_free(io);
return NULL;
}
GAtIO *g_at_io_new(GIOChannel *channel)
{
return create_io(channel, G_IO_FLAG_NONBLOCK);
}
GAtIO *g_at_io_new_blocking(GIOChannel *channel)
{
return create_io(channel, 0);
}
GIOChannel *g_at_io_get_channel(GAtIO *io)
{
if (io == NULL)
return NULL;
return io->channel;
}
gboolean g_at_io_set_read_handler(GAtIO *io, GAtIOReadFunc read_handler,
gpointer user_data)
{
if (io == NULL)
return FALSE;
io->read_handler = read_handler;
io->read_data = user_data;
if (read_handler && ring_buffer_len(io->buf) > 0)
read_handler(io->buf, user_data);
return TRUE;
}
static gboolean call_blocking_read(gpointer user_data)
{
GAtIO *io = user_data;
while (can_write_data(io->channel, G_IO_OUT, io) == TRUE);
write_watcher_destroy_notify(io);
return FALSE;
}
gboolean g_at_io_set_write_handler(GAtIO *io, GAtIOWriteFunc write_handler,
gpointer user_data)
{
if (io == NULL)
return FALSE;
if (io->write_watch > 0) {
if (write_handler == NULL) {
g_source_remove(io->write_watch);
return TRUE;
}
return FALSE;
}
if (write_handler == NULL)
return FALSE;
io->write_handler = write_handler;
io->write_data = user_data;
if (io->use_write_watch == TRUE)
io->write_watch = g_io_add_watch_full(io->channel,
G_PRIORITY_HIGH,
G_IO_OUT | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
can_write_data, io,
write_watcher_destroy_notify);
else
io->write_watch = g_idle_add(call_blocking_read, io);
return TRUE;
}
GAtIO *g_at_io_ref(GAtIO *io)
{
if (io == NULL)
return NULL;
g_atomic_int_inc(&io->ref_count);
return io;
}
static gboolean io_shutdown(GAtIO *io)
{
/* Don't trigger user disconnect on shutdown */
io->user_disconnect = NULL;
io->user_disconnect_data = NULL;
if (io->read_watch > 0)
g_source_remove(io->read_watch);
if (io->write_watch > 0)
g_source_remove(io->write_watch);
return TRUE;
}
void g_at_io_unref(GAtIO *io)
{
gboolean is_zero;
if (io == NULL)
return;
is_zero = g_atomic_int_dec_and_test(&io->ref_count);
if (is_zero == FALSE)
return;
io_shutdown(io);
/* glib delays the destruction of the watcher until it exits, this
* means we can't free the data just yet, even though we've been
* destroyed already. We have to wait until the read_watcher
* destroy function gets called
*/
if (io->read_watch > 0)
io->destroyed = TRUE;
else
g_free(io);
}
gboolean g_at_io_set_disconnect_function(GAtIO *io,
GAtDisconnectFunc disconnect, gpointer user_data)
{
if (io == NULL)
return FALSE;
io->user_disconnect = disconnect;
io->user_disconnect_data = user_data;
return TRUE;
}
gboolean g_at_io_set_debug(GAtIO *io, GAtDebugFunc func, gpointer user_data)
{
if (io == NULL)
return FALSE;
io->debugf = func;
io->debug_data = user_data;
return TRUE;
}
void g_at_io_set_write_done(GAtIO *io, GAtDisconnectFunc func,
gpointer user_data)
{
if (io == NULL)
return;
io->write_done_func = func;
io->write_done_data = user_data;
}
void g_at_io_drain_ring_buffer(GAtIO *io, guint len)
{
ring_buffer_drain(io->buf, len);
}
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