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[/] [ao486/] [trunk/] [syn/] [components/] [sd_card/] [firmware/] [bsp/] [HAL/] [src/] [alt_fstat.c] - Rev 8
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/****************************************************************************** * * * License Agreement * * * * Copyright (c) 2006 Altera Corporation, San Jose, California, USA. * * All rights reserved. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the "Software"), * * to deal in the Software without restriction, including without limitation * * the rights to use, copy, modify, merge, publish, distribute, sublicense, * * and/or sell copies of the Software, and to permit persons to whom the * * Software is furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included in * * all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * * DEALINGS IN THE SOFTWARE. * * * * This agreement shall be governed in all respects by the laws of the State * * of California and by the laws of the United States of America. * * * * Altera does not recommend, suggest or require that this reference design * * file be used in conjunction or combination with any other product. * ******************************************************************************/ #include <stddef.h> #include <sys/stat.h> #include "sys/alt_dev.h" #include "sys/alt_warning.h" #include "sys/alt_errno.h" #include "priv/alt_file.h" #include "os/alt_syscall.h" /* * The fstat() system call is used to obtain information about the capabilities * of an open file descriptor. By default file descriptors are marked as * being character devices. If a device or file system wishes to advertise * alternative capabilities then they can register an fstat() function within * their associated alt_dev structure. This will be called to fill in the * entries in the imput "st" structure. * * This function is provided for compatability with newlib. * * ALT_FSTAT is mapped onto the fstat() system call in alt_syscall.h */ #ifdef ALT_USE_DIRECT_DRIVERS #include "system.h" /* * Provide minimal version that just describes all file descriptors * as character devices for provided stdio devices. */ int ALT_FSTAT (int file, struct stat *st) { switch (file) { #ifdef ALT_STDIN_PRESENT case 0: /* stdin file descriptor */ #endif /* ALT_STDIN_PRESENT */ #ifdef ALT_STDOUT_PRESENT case 1: /* stdout file descriptor */ #endif /* ALT_STDOUT_PRESENT */ #ifdef ALT_STDERR_PRESENT case 2: /* stderr file descriptor */ #endif /* ALT_STDERR_PRESENT */ st->st_mode = _IFCHR; return 0; default: return -1; } #if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT) /* Generate a link time warning, should this function ever be called. */ ALT_STUB_WARNING(fstat); #endif } #else /* !ALT_USE_DIRECT_DRIVERS */ int ALT_FSTAT (int file, struct stat *st) { alt_fd* fd; /* * A common error case is that when the file descriptor was created, the call * to open() failed resulting in a negative file descriptor. This is trapped * below so that we don't try and process an invalid file descriptor. */ fd = (file < 0) ? NULL : &alt_fd_list[file]; if (fd) { /* Call the drivers fstat() function to fill out the "st" structure. */ if (fd->dev->fstat) { return fd->dev->fstat(fd, st); } /* * If no function is provided, mark the fd as belonging to a character * device. */ else { st->st_mode = _IFCHR; return 0; } } else { ALT_ERRNO = EBADFD; return -1; } } #endif /* ALT_USE_DIRECT_DRIVERS */