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https://github.com/marqs85/ossc
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129 lines
4.8 KiB
C
129 lines
4.8 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2006 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 <sys/stat.h>
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#include "sys/alt_dev.h"
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#include "sys/alt_warning.h"
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#include "sys/alt_errno.h"
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#include "priv/alt_file.h"
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#include "os/alt_syscall.h"
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/*
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* The fstat() system call is used to obtain information about the capabilities
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* of an open file descriptor. By default file descriptors are marked as
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* being character devices. If a device or file system wishes to advertise
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* alternative capabilities then they can register an fstat() function within
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* their associated alt_dev structure. This will be called to fill in the
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* entries in the imput "st" structure.
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*
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* This function is provided for compatability with newlib.
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*
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* ALT_FSTAT is mapped onto the fstat() system call in alt_syscall.h
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*/
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#ifdef ALT_USE_DIRECT_DRIVERS
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#include "system.h"
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/*
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* Provide minimal version that just describes all file descriptors
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* as character devices for provided stdio devices.
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*/
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int ALT_FSTAT (int file, struct stat *st)
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{
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switch (file) {
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#ifdef ALT_STDIN_PRESENT
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case 0: /* stdin file descriptor */
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#endif /* ALT_STDIN_PRESENT */
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#ifdef ALT_STDOUT_PRESENT
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case 1: /* stdout file descriptor */
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#endif /* ALT_STDOUT_PRESENT */
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#ifdef ALT_STDERR_PRESENT
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case 2: /* stderr file descriptor */
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#endif /* ALT_STDERR_PRESENT */
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st->st_mode = _IFCHR;
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return 0;
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default:
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return -1;
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}
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#if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)
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/* Generate a link time warning, should this function ever be called. */
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ALT_STUB_WARNING(fstat);
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#endif
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}
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#else /* !ALT_USE_DIRECT_DRIVERS */
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int ALT_FSTAT (int file, struct stat *st)
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{
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alt_fd* fd;
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/*
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* A common error case is that when the file descriptor was created, the call
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* to open() failed resulting in a negative file descriptor. This is trapped
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* below so that we don't try and process an invalid file descriptor.
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*/
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fd = (file < 0) ? NULL : &alt_fd_list[file];
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if (fd)
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{
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/* Call the drivers fstat() function to fill out the "st" structure. */
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if (fd->dev->fstat)
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{
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return fd->dev->fstat(fd, st);
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}
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/*
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* If no function is provided, mark the fd as belonging to a character
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* device.
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*/
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else
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{
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st->st_mode = _IFCHR;
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return 0;
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}
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}
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else
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{
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ALT_ERRNO = EBADFD;
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return -1;
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}
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}
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#endif /* ALT_USE_DIRECT_DRIVERS */
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