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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2012 Nordic Semiconductor Inc.
* Copyright (C) 2012 Instituto Nokia de Tecnologia - INdT
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <glib.h>
#include "src/log.h"
#include "suspend.h"
#define HOG_SUSPEND_FIFO "/tmp/hogsuspend"
static suspend_event suspend_cb = NULL;
static resume_event resume_cb = NULL;
static guint watch = 0;
static int fifo_open(void);
static gboolean read_fifo(GIOChannel *io, GIOCondition cond, gpointer user_data)
{
char buffer[12];
gsize offset, left, bread;
GIOStatus iostatus;
if (cond & (G_IO_ERR | G_IO_HUP)) {
/*
* Both ends needs to be open simultaneously before proceeding
* any input or output operation. When the remote closes the
* channel, hup signal is received on this end.
*/
fifo_open();
return FALSE;
}
offset = 0;
left = sizeof(buffer) - 1;
memset(buffer, 0, sizeof(buffer));
do {
iostatus = g_io_channel_read_chars(io, &buffer[offset], left,
&bread, NULL);
offset += bread;
left -= bread;
if (left == 0)
break;
} while (iostatus == G_IO_STATUS_NORMAL);
if (g_ascii_strncasecmp("suspend", buffer, 7) == 0)
suspend_cb();
else if (g_ascii_strncasecmp("resume", buffer, 6) == 0)
resume_cb();
return TRUE;
}
static int fifo_open(void)
{
GIOCondition condition = G_IO_IN | G_IO_ERR | G_IO_HUP;
GIOChannel *fifoio;
int fd;
fd = open(HOG_SUSPEND_FIFO, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
int err = -errno;
error("Can't open FIFO (%s): %s(%d)", HOG_SUSPEND_FIFO,
strerror(-err), -err);
return err;
}
fifoio = g_io_channel_unix_new(fd);
g_io_channel_set_close_on_unref(fifoio, TRUE);
watch = g_io_add_watch(fifoio, condition, read_fifo, NULL);
g_io_channel_unref(fifoio);
return 0;
}
int suspend_init(suspend_event suspend, resume_event resume)
{
struct stat st;
int ret;
DBG("");
suspend_cb = suspend;
resume_cb = resume;
if (stat(HOG_SUSPEND_FIFO, &st) == 0) {
if (!S_ISFIFO(st.st_mode)) {
error("Unexpected non-FIFO %s file", HOG_SUSPEND_FIFO);
return -EIO;
}
if (unlink(HOG_SUSPEND_FIFO) < 0) {
int err = -errno;
error("Failed to remove FIFO (%s): %s (%d)",
HOG_SUSPEND_FIFO, strerror(-err), -err);
return err;
}
}
if (mkfifo(HOG_SUSPEND_FIFO, 0600) < 0) {
int err = -errno;
error("Can't create FIFO (%s): %s (%d)", HOG_SUSPEND_FIFO,
strerror(-err), -err);
return err;
}
DBG("Created suspend-dummy FIFO on %s", HOG_SUSPEND_FIFO);
ret = fifo_open();
if (ret < 0)
unlink(HOG_SUSPEND_FIFO);
return ret;
}
void suspend_exit(void)
{
if (watch > 0) {
g_source_remove(watch);
watch = 0;
}
unlink(HOG_SUSPEND_FIFO);
}
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