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76 lines
3.6 KiB
C
76 lines
3.6 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 <errno.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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* The alt_fs_reg() function is used to register a file system. Once registered
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* a device can be accessed using the standard posix calls: open(), read(),
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* write() etc.
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*
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* System behaviour is undefined in the event that a file system is registered
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* with a name that conflicts with an existing device or file system.
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*
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* alt_fs_reg() is not thread safe in the sense that there should be no other
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* thread using the file system list at the time that alt_dev_reg() is called. In
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* practice this means that alt_fs_reg() should only be called while operating
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* in a single threaded mode. The expectation is that it will only be called
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* by the file system initilisation functions invoked by alt_sys_init(), which in
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* turn should only be called by the single threaded C startup code.
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*
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* A return value of zero indicates success. A negative return value indicates
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* failure.
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*/
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int alt_fs_reg (alt_dev* dev)
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{
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/*
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* check that the device has a name.
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*/
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if (!dev->name)
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{
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return -ENODEV;
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}
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/*
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* register the file system.
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*/
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alt_llist_insert(&alt_fs_list, &dev->llist);
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return 0;
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}
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