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/****************************************************************************
* apps/system/free/free.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/progmem.h>
#include <stdio.h>
#include <stdlib.h>
/****************************************************************************
* Private Typs
****************************************************************************/
struct usbmon_state_s
{
#ifdef CONFIG_NSH_BUILTIN_APPS
volatile bool started;
volatile bool stop;
pid_t pid;
#endif
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct usbmon_state_s g_usbmonitor;
/****************************************************************************
* Private Functions
****************************************************************************/
static int usbmonitor_daemon(int argc, char **argv)
{
#ifdef CONFIG_NSH_BUILTIN_APPS
print("USB Monitor running: %d\n", g_usbmonitor.pid);
#endif
#ifdef CONFIG_NSH_BUILTIN_APPS
/* If we are running as an NSH command, then loop until we detect that
* there is a request to stop.
*/
while (!g_usbmonitor.stop)
#else
/* If we are running as a standalone program, then loop forever */
for (;;)
#endif
{
#warning "Missing logic"
}
/* Stopped */
#ifdef CONFIG_NSH_BUILTIN_APPS
g_usbmonitor.stop = false;
g_usbmonitor.started = false;
print("USB Monitor stopped: %d\n", g_usbmonitor.pid);
#endif
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int usbmonitor_main(int argc, char **argv)
{
#ifdef CONFIG_NSH_BUILTIN_APPS
/* Has the monitor already started? */
sched_lock();
if (!g_usbmonitor.started)
{
int ret;
/* No.. start it now */
g_usbmonitor.started = true;
g_usbmonitor.stop = false;
ret = TASK_CREATE("USB Monitor", CONFIG_SYSTEM_USBMONITOR_PRIORITY,
CONFIG_SYSTEM_USBMONITOR_STACKSIZE,
(main_t)usbmonitor_daemon, (const char **)NULL);
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to start the USB monitor: %d\n",
errcode);
}
else
{
g_usbmonitor.pid = ret;
print("USB Monitor started: %d\n", g_usbmonitor.pid);
}
sched_unlock();
return 0;
}
sched_unlock();
print("USB Monitor running: %d\n", g_usbmonitor.pid);
return 0;
#else
return usbmonitor_daemon(argc, argv);
#endif
}
#ifdef CONFIG_NSH_BUILTIN_APPS
int usbmonitor_stop(int argc, char **argv)
{
/* Has the monitor already started? */
if (g_usbmonitor.started)
{
print("USB Monitor stopping: %d\n", g_usbmonitor.pid);
g_usbmonitor.stop = true;
return 0;
}
print("USB Monitor stopped: %d\n", g_usbmonitor.pid);
return 0;
}
#endif
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