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/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "sys/alt_dev.h"
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#include "priv/alt_file.h"
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/*
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* alt_open_fd() is similar to open() in that it is used to obtain a file
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* descriptor for the file named "name". The "flags" and "mode" arguments are
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* identical to the "flags" and "mode" arguments of open().
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*
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* The distinction between the two functions is that the file descriptor
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* structure to use is passed in as an argument, rather than allocated from the
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* list of free file descriptors.
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*
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* This is used by alt_io_redirect() to redirect the stdin, stdout and stderr
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* file descriptors to point to new devices.
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*
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* If the device can not be succesfully opened, then the input file descriptor
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* remains unchanged.
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*/
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static void alt_open_fd(alt_fd* fd, const char* name, int flags, int mode)
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{
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int old;
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old = open (name, flags, mode);
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if (old >= 0)
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{
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fd->dev = alt_fd_list[old].dev;
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fd->priv = alt_fd_list[old].priv;
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fd->fd_flags = alt_fd_list[old].fd_flags;
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alt_release_fd (old);
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}
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}
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/*
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* alt_io_redirect() is called once the device/filesystem lists have been
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* initialised, but before main(). Its function is to redirect standard in,
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* standard out and standard error so that they point to the devices selected by
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* the user (as defined in system.h).
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*
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* Prior to the call to this function, io is directed towards /dev/null. If
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* i/o can not be redirected to the requested device, for example if the device
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* does not exist, then it remains directed at /dev/null.
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*/
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void alt_io_redirect(const char* stdout_dev,
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const char* stdin_dev,
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const char* stderr_dev)
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{
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/* Redirect the channels */
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alt_open_fd (&alt_fd_list[STDOUT_FILENO], stdout_dev, O_WRONLY, 0777);
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alt_open_fd (&alt_fd_list[STDIN_FILENO], stdin_dev, O_RDONLY, 0777);
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alt_open_fd (&alt_fd_list[STDERR_FILENO], stderr_dev, O_WRONLY, 0777);
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}
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