163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2012 Nordic Semiconductor Inc.
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* Copyright (C) 2012 Instituto Nokia de Tecnologia - INdT
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*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <glib.h>
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#include "src/log.h"
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#include "suspend.h"
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#define HOG_SUSPEND_FIFO "/tmp/hogsuspend"
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static suspend_event suspend_cb = NULL;
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static resume_event resume_cb = NULL;
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static guint watch = 0;
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static int fifo_open(void);
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static gboolean read_fifo(GIOChannel *io, GIOCondition cond, gpointer user_data)
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{
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char buffer[12];
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gsize offset, left, bread;
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GIOStatus iostatus;
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if (cond & (G_IO_ERR | G_IO_HUP)) {
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/*
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* Both ends needs to be open simultaneously before proceeding
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* any input or output operation. When the remote closes the
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* channel, hup signal is received on this end.
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*/
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fifo_open();
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return FALSE;
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}
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offset = 0;
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left = sizeof(buffer) - 1;
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memset(buffer, 0, sizeof(buffer));
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do {
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iostatus = g_io_channel_read_chars(io, &buffer[offset], left,
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&bread, NULL);
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offset += bread;
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left -= bread;
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if (left == 0)
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break;
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} while (iostatus == G_IO_STATUS_NORMAL);
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if (g_ascii_strncasecmp("suspend", buffer, 7) == 0)
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suspend_cb();
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else if (g_ascii_strncasecmp("resume", buffer, 6) == 0)
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resume_cb();
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return TRUE;
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}
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static int fifo_open(void)
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{
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GIOCondition condition = G_IO_IN | G_IO_ERR | G_IO_HUP;
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GIOChannel *fifoio;
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int fd;
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fd = open(HOG_SUSPEND_FIFO, O_RDONLY | O_NONBLOCK);
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if (fd < 0) {
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int err = -errno;
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error("Can't open FIFO (%s): %s(%d)", HOG_SUSPEND_FIFO,
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strerror(-err), -err);
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return err;
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}
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fifoio = g_io_channel_unix_new(fd);
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g_io_channel_set_close_on_unref(fifoio, TRUE);
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watch = g_io_add_watch(fifoio, condition, read_fifo, NULL);
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g_io_channel_unref(fifoio);
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return 0;
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}
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int suspend_init(suspend_event suspend, resume_event resume)
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{
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struct stat st;
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int ret;
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DBG("");
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suspend_cb = suspend;
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resume_cb = resume;
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if (stat(HOG_SUSPEND_FIFO, &st) == 0) {
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if (!S_ISFIFO(st.st_mode)) {
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error("Unexpected non-FIFO %s file", HOG_SUSPEND_FIFO);
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return -EIO;
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}
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if (unlink(HOG_SUSPEND_FIFO) < 0) {
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int err = -errno;
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error("Failed to remove FIFO (%s): %s (%d)",
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HOG_SUSPEND_FIFO, strerror(-err), -err);
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return err;
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}
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}
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if (mkfifo(HOG_SUSPEND_FIFO, S_IRUSR | S_IWUSR) < 0) {
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int err = -errno;
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error("Can't create FIFO (%s): %s (%d)", HOG_SUSPEND_FIFO,
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strerror(-err), -err);
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return err;
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}
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DBG("Created suspend-dummy FIFO on %s", HOG_SUSPEND_FIFO);
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ret = fifo_open();
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if (ret < 0)
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unlink(HOG_SUSPEND_FIFO);
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return ret;
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}
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void suspend_exit(void)
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{
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if (watch > 0) {
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g_source_remove(watch);
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watch = 0;
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}
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unlink(HOG_SUSPEND_FIFO);
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}
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