mirror of git://git.sysmocom.de/ofono
gatchat: Add initial GAtIO implementation
This commit is contained in:
Denis Kenzior
parent
3d0d2db83f
commit
5fc7c1e1d0
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@ -55,6 +55,7 @@ gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \
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gatchat/gatresult.h gatchat/gatresult.c \
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gatchat/gatsyntax.h gatchat/gatsyntax.c \
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gatchat/ringbuffer.h gatchat/ringbuffer.c \
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gatchat/gatio.h gatchat/gatio.c \
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gatchat/crc-ccitt.h gatchat/crc-ccitt.c \
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gatchat/gatmux.h gatchat/gatmux.c \
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gatchat/gsm0710.h gatchat/gsm0710.c \
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@ -0,0 +1,265 @@
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/*
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*
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* AT chat library with GLib integration
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*
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* Copyright (C) 2008-2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <glib.h>
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#include "ringbuffer.h"
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#include "gatio.h"
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#include "gatutil.h"
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struct _GAtIO {
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gint ref_count; /* Ref count */
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guint read_watch; /* GSource read id, 0 if no */
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GIOChannel *channel; /* comms channel */
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GAtDisconnectFunc user_disconnect; /* user disconnect func */
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gpointer user_disconnect_data; /* user disconnect data */
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struct ring_buffer *buf; /* Current read buffer */
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guint max_read_attempts; /* max reads / select */
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GAtIOReadFunc read_handler; /* Read callback */
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gpointer read_data; /* Read callback userdata */
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GAtDebugFunc debugf; /* debugging output function */
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gpointer debug_data; /* Data to pass to debug func */
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gboolean destroyed; /* Re-entrancy guard */
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};
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static void read_watcher_destroy_notify(gpointer user_data)
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{
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GAtIO *io = user_data;
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ring_buffer_free(io->buf);
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io->buf = NULL;
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io->channel = NULL;
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io->read_watch = 0;
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if (io->user_disconnect)
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io->user_disconnect(io->user_disconnect_data);
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if (io->destroyed)
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g_free(io);
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}
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static gboolean received_data(GIOChannel *channel, GIOCondition cond,
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gpointer data)
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{
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unsigned char *buf;
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GAtIO *io = data;
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GIOError err;
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gsize rbytes;
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gsize toread;
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gsize total_read = 0;
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guint read_count = 0;
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if (cond & G_IO_NVAL)
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return FALSE;
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/* Regardless of condition, try to read all the data available */
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do {
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toread = ring_buffer_avail_no_wrap(io->buf);
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if (toread == 0)
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break;
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rbytes = 0;
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buf = ring_buffer_write_ptr(io->buf, 0);
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err = g_io_channel_read(channel, (char *) buf, toread, &rbytes);
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g_at_util_debug_chat(TRUE, (char *)buf, rbytes,
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io->debugf, io->debug_data);
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read_count++;
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total_read += rbytes;
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if (rbytes > 0)
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ring_buffer_write_advance(io->buf, rbytes);
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} while (err == G_IO_ERROR_NONE && rbytes > 0 &&
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read_count < io->max_read_attempts);
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if (total_read > 0 && io->read_handler)
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io->read_handler(io->buf, io->read_data);
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if (cond & (G_IO_HUP | G_IO_ERR))
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return FALSE;
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if (read_count > 0 && rbytes == 0 && err != G_IO_ERROR_AGAIN)
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return FALSE;
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return TRUE;
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}
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static GAtIO *create_io(GIOChannel *channel, GIOFlags flags)
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{
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GAtIO *io;
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if (!channel)
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return NULL;
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io = g_try_new0(GAtIO, 1);
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if (!io)
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return io;
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io->ref_count = 1;
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io->debugf = NULL;
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if (flags & G_IO_FLAG_NONBLOCK)
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io->max_read_attempts = 3;
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else
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io->max_read_attempts = 1;
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io->buf = ring_buffer_new(4096);
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if (!io->buf)
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goto error;
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if (!g_at_util_setup_io(channel, flags))
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goto error;
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io->channel = channel;
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io->read_watch = g_io_add_watch_full(channel, G_PRIORITY_DEFAULT,
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G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
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received_data, io,
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read_watcher_destroy_notify);
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return io;
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error:
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if (io->buf)
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ring_buffer_free(io->buf);
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g_free(io);
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return NULL;
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}
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GAtIO *g_at_io_new(GIOChannel *channel)
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{
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return create_io(channel, G_IO_FLAG_NONBLOCK);
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}
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GAtIO *g_at_io_new_blocking(GIOChannel *channel)
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{
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return create_io(channel, 0);
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}
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GIOChannel *g_at_io_get_channel(GAtIO *io)
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{
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if (io == NULL)
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return NULL;
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return io->channel;
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}
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gboolean g_at_io_set_read_handler(GAtIO *io, GAtIOReadFunc read_handler,
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gpointer user_data)
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{
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if (io == NULL)
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return FALSE;
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io->read_handler = read_handler;
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io->read_data = user_data;
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if (read_handler && ring_buffer_len(io->buf) > 0)
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read_handler(io->buf, user_data);
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return TRUE;
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}
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GAtIO *g_at_io_ref(GAtIO *io)
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{
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if (io == NULL)
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return NULL;
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g_atomic_int_inc(&io->ref_count);
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return io;
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}
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void g_at_io_unref(GAtIO *io)
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{
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gboolean is_zero;
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if (io == NULL)
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return;
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is_zero = g_atomic_int_dec_and_test(&io->ref_count);
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if (is_zero == FALSE)
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return;
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g_at_io_shutdown(io);
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/* glib delays the destruction of the watcher until it exits, this
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* means we can't free the data just yet, even though we've been
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* destroyed already. We have to wait until the read_watcher
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* destroy function gets called
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*/
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if (io->read_watch != 0)
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io->destroyed = TRUE;
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else
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g_free(io);
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}
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gboolean g_at_io_shutdown(GAtIO *io)
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{
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if (io->channel == NULL)
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return FALSE;
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if (io->read_watch)
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g_source_remove(io->read_watch);
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return TRUE;
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}
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gboolean g_at_io_set_disconnect_function(GAtIO *io,
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GAtDisconnectFunc disconnect, gpointer user_data)
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{
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if (io == NULL)
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return FALSE;
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io->user_disconnect = disconnect;
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io->user_disconnect_data = user_data;
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return TRUE;
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}
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gboolean g_at_io_set_debug(GAtIO *io, GAtDebugFunc func, gpointer user_data)
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{
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if (io == NULL)
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return FALSE;
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io->debugf = func;
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io->debug_data = user_data;
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return TRUE;
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}
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@ -0,0 +1,60 @@
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/*
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*
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* AT chat library with GLib integration
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*
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* Copyright (C) 2008-2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __GATIO_H
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#define __GATIO_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "gat.h"
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struct _GAtIO;
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typedef struct _GAtIO GAtIO;
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typedef void (*GAtIOReadFunc)(struct ring_buffer *buffer, gpointer user_data);
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typedef void (*GAtIOWriteFunc)(gpointer user_data);
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GAtIO *g_at_io_new(GIOChannel *channel);
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GAtIO *g_at_io_new_blocking(GIOChannel *channel);
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GIOChannel *g_at_io_get_channel(GAtIO *io);
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GAtIO *g_at_io_ref(GAtIO *io);
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void g_at_io_unref(GAtIO *io);
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gboolean g_at_io_shutdown(GAtIO *io);
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gboolean g_at_io_set_read_handler(GAtIO *io, GAtIOReadFunc read_handler,
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gpointer user_data);
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gboolean g_at_io_set_disconnect_function(GAtIO *io,
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GAtDisconnectFunc disconnect, gpointer user_data);
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gboolean g_at_io_set_debug(GAtIO *io, GAtDebugFunc func, gpointer user_data);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __GATIO_H */
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