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Diffstat (limited to 'apps/nshlib/nsh_usbdev.c')
-rw-r--r-- | apps/nshlib/nsh_usbdev.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/apps/nshlib/nsh_usbdev.c b/apps/nshlib/nsh_usbdev.c new file mode 100644 index 000000000..bb17244c1 --- /dev/null +++ b/apps/nshlib/nsh_usbdev.c @@ -0,0 +1,149 @@ +/**************************************************************************** + * 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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