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/****************************************************************************
* apps/nshlib/nsh_usbdev.c
*
* Copyright (C) 2012 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 <stdlib.h>
#include "nsh.h"
#ifdef CONFIG_USBDEV
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_usbconsole
****************************************************************************/
#ifdef HAVE_USB_CONSOLE
int nsh_usbconsole(void)
{
int errval;
int fd;
/* Don't start the NSH console until the console device is ready. Chances
* are, we get here with no functional console. The USB console will not
* be available until the device is connected to the host and until the
* host-side application opens the connection.
*/
/* Make sure the stdin, stdout, and stderr are closed */
(void)fclose(stdin);
(void)fclose(stdout);
(void)fclose(stderr);
/* Open the USB serial device for writing */
do
{
/* Try to open the console */
fd = open("/dev/console", O_RDWR);
if (fd < 0)
{
/* ENOTCONN means that the USB device is not yet connected. Anything
* else is bad.
*/
DEBUGASSERT(errno == ENOTCONN);
/* Sleep a bit and try again */
sleep(2);
}
}
while (fd < 0);
/* Dup the fd to create standard fd 0-2 */
(void)dup2(fd, 0);
(void)dup2(fd, 1);
(void)dup2(fd, 2);
/* We can close the original file descriptor now (unless it was one of 0-2) */
if (fd > 2)
{
close(fd);
}
/* fdopen to get the stdin, stdout and stderr streams. The following logic depends
* on the fact that the library* layer will allocate FILEs in order. And since
* we closed stdin, stdout, and stderr above, that is what we should get.
*
* fd = 0 is stdin (read-only)
* fd = 1 is stdout (write-only, append)
* fd = 2 is stderr (write-only, append)
*/
(void)fdopen(0, "r");
(void)fdopen(1, "a");
(void)fdopen(2, "a");
return OK;
}
#endif /* HAVE_USB_CONSOLE */
#endif /* CONFIG_USBDEV */
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