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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 <errno.h>
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#include "sys/alt_dev.h"
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#include "priv/alt_file.h"
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#include "alt_types.h"
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#include "system.h"
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/*
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* This file contains the data constructs used to control access to device and
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* filesytems.
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*/
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/*
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* "alt_fs_list" is the head of a linked list of registered filesystems. It is
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* initialised as an empty list. New entries can be added using the
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* alt_fs_reg() function.
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*/
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ALT_LLIST_HEAD(alt_fs_list);
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/*
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* "alt_dev_list" is the head of a linked list of registered devices. It is
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* configured at startup to include a single device, "alt_dev_null". This
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* device is discussed below.
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*/
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extern alt_dev alt_dev_null; /* forward declaration */
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alt_llist alt_dev_list = {&alt_dev_null.llist, &alt_dev_null.llist};
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/*
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* alt_dev_null_write() is the implementation of the write() function used
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* by the alt_dev_null device. It simple discards all data passed to it, and
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* indicates that the data has been successfully transmitted.
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*/
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static int alt_dev_null_write (alt_fd* fd, const char* ptr, int len)
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{
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return len;
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}
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/*
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* "alt_dev_null" is used to allow output to be redirected to nowhere. It is
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* the only device registered before the call to alt_sys_init(). At startup
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* stin, stdout & stderr are all directed towards this device so that library
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* calls like printf() will be safe but inefectual.
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*/
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alt_dev alt_dev_null = {
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{
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&alt_dev_list,
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&alt_dev_list
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},
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"/dev/null",
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NULL, /* open */
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NULL, /* close */
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NULL, /* write */
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alt_dev_null_write, /* write */
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NULL, /* lseek */
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NULL, /* fstat */
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NULL /* ioctl */
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};
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/*
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* "alt_fd_list_lock" is a semaphore used to control access to the file
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* descriptor list. This is used to ensure that access to the list is thread
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* safe.
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*/
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ALT_SEM(alt_fd_list_lock)
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/*
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* "alt_max_fd" is used to make access to the file descriptor list more
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* efficent. It is set to be the value of the highest allocated file
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* descriptor. This saves having to search the entire pool of unallocated
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* file descriptors when looking for a match.
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*/
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alt_32 alt_max_fd = -1;
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/*
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* "alt_fd_list" is the file descriptor pool. The first three entries in the
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* array are configured as standard in, standard out, and standard error. These
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* are all initialised so that accesses are directed to the alt_dev_null
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* device. The remaining file descriptors are initialised as unallocated.
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*
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* The maximum number of file descriptors within the system is specified by the
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* user defined macro "ALT_MAX_FD". This is defined in "system.h", which is
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* auto-genereated using the projects PTF and STF files.
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*/
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alt_fd alt_fd_list[ALT_MAX_FD] =
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{
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{
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&alt_dev_null, /* standard in */
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0,
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},
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{
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&alt_dev_null, /* standard out */
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0,
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},
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{
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&alt_dev_null, /* standard error */
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0,
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}
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/* all other elements are set to zero */
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};
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