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104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/******************************************************************************
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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 <unistd.h>
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#include "sys/alt_errno.h"
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#include "sys/alt_warning.h"
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#include "priv/alt_file.h"
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#include "os/alt_syscall.h"
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#ifdef ALT_USE_DIRECT_DRIVERS
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int ALT_CLOSE (int fildes)
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{
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/* Generate a link time warning, should this function ever be called. */
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ALT_STUB_WARNING(close);
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/* Indicate an error */
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ALT_ERRNO = ENOSYS;
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return -1;
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}
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#else /* !ALT_USE_DIRECT_DRIVERS */
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/*
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* close() is called by an application to release a file descriptor. If the
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* associated file system/device has a close() callback function registered
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* then this called. The file descriptor is then marked as free.
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*
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* ALT_CLOSE is mapped onto the close() system call in alt_syscall.h
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*/
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int ALT_CLOSE (int fildes)
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{
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alt_fd* fd;
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int rval;
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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 = (fildes < 0) ? NULL : &alt_fd_list[fildes];
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if (fd)
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{
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/*
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* If the associated file system/device has a close function, call it so
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* that any necessary cleanup code can run.
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*/
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rval = (fd->dev->close) ? fd->dev->close(fd) : 0;
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/* Free the file descriptor structure and return. */
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alt_release_fd (fildes);
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if (rval < 0)
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{
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ALT_ERRNO = -rval;
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return -1;
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}
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return 0;
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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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