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/*
* Copyright (c) International Business Machines Corp., 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* UBI (Unsorted Block Images) library.
*
* Author: Artem B. Bityutskiy
*/
/**
* sysfs_read_data - read data from a sysfs file.
*
* @file path to the file to read from
* @buf furrer where to store read data
* @len length of provided buffer @buf
*
* This function returns the number of read bytes or -1 in case of error.
*/
int sysfs_read_data(const char *file, void *buf, int len);
/**
* sysfs_read_data_subst - form path to a sysfs file and read data from it.
*
* @patt path to the file to read from
* @buf furrer where to store read data
* @len length of provided buffer @buf
* @n number of parameters to substitute to @patt
*
* This function forms path to a sysfs file by means of substituting parameters
* to @patt and then reads @len bytes from this file and stores the read data
* to @buf. This function returns the number of read bytes or -1 in case of
* error.
*/
int sysfs_read_data_subst(const char *patt, void *buf, int len, int n, ...);
/**
* sysfs_read_dev - read major and minor number from a sysfs file.
*
* @file path to the file to read from
* @major major number is returned here
* @minor minor number is returned here
*/
int sysfs_read_dev(const char *file, unsigned int *major,
unsigned int *minor);
/**
* sysfs_read_dev_subst - for path to a file and read major and minor number
* from it.
*
* @patt pattern of the path to the file to read from
* @major major number is returned here
* @minor minor number is returned here
* @n number of arguments to substitute
*
* This function substitures arguments to the @patt file path pattern and reads
* major and minor numbers from the resulting file.
*/
int sysfs_read_dev_subst(const char *patt, unsigned int *major,
unsigned int *minor, int n, ...);
/**
* sysfs_read_ull_subst - form path to a sysfs file and read an unsigned long
* long value from there.
*
* @patt pattern of file path
* @num the read value is returned here
* @n number of parameters to substitute
*
*
* This function first forms the path to a sysfs file by means of substituting
* passed parameters to the @patt string, and then read an 'unsigned long long'
* value from this file.
*/
int sysfs_read_ull_subst(const char *patt, unsigned long long *num,
int n, ...);
/**
* sysfs_read_uint_subst - the same as 'sysfs_read_uint_subst()' but reads an
* unsigned int value.
*/
int sysfs_read_uint_subst(const char *patt, unsigned int *num,
int n, ...);
/**
* sysfs_read_ll - read a long long integer from an UBI sysfs file.
*
* @file file name from where to read
* @num the result is returned here
*/
int sysfs_read_ll(const char *file, long long *num);
/**
* sysfs_read_int - the same as 'sysfs_read_ll()' but reads an 'int' value.
*/
int sysfs_read_int(const char *file, int *num);
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