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/*
* libexplain - Explain errno values returned by libc functions
* Copyright (C) 2009-2011 Peter Miller
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/sys/ioctl.h>
#include <libexplain/ac/errno.h>
#include <libexplain/ac/linux/hdreg.h>
#include <libexplain/ac/linux/msdos_fs.h> /* for SECTOR_SIZE */
#include <libexplain/buffer/char_data.h>
#include <libexplain/buffer/dac.h>
#include <libexplain/buffer/efault.h>
#include <libexplain/buffer/is_the_null_pointer.h>
#include <libexplain/capability.h>
#include <libexplain/iocontrol/generic.h>
#include <libexplain/iocontrol/hdio_drive_cmd.h>
#include <libexplain/buffer/int.h>
#ifdef HDIO_DRIVE_CMD
static void
print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
(void)p;
(void)errnum;
(void)fildes;
(void)request;
explain_buffer_char_data(sb, data, 4);
}
#define min(a, b) ((a) < (b) ? (a) : (b))
static void
print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
size_t len;
const unsigned char *args;
(void)p;
(void)errnum;
(void)fildes;
(void)request;
args = data;
/*
* args[0] = status
* args[1] = error
* args[2] = sector count (output)
* args[3] = sector count (input)
*/
len = 4 + SECTOR_SIZE * min(args[2], args[3]);
explain_buffer_char_data(sb, data, len);
}
static void
print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb, int
errnum, int fildes, int request, const void *data)
{
switch (errnum)
{
case EACCES:
/* you need both CAP_SYS_ADMIN and CAP_SYS_RAWIO */
if (!explain_capability_sys_admin())
{
explain_buffer_dac_sys_admin(sb);
break;
}
if (!explain_capability_sys_rawio())
{
explain_buffer_dac_sys_rawio(sb);
break;
}
goto generic;
case EFAULT:
explain_buffer_efault(sb, "data");
break;
case EINVAL:
if (!data)
{
explain_buffer_is_the_null_pointer(sb, "data");
break;
}
goto generic;
case ENOMEM:
case EIO:
goto generic;
default:
generic:
explain_iocontrol_generic_print_explanation
(
p,
sb,
errnum,
fildes,
request,
data
);
break;
}
}
/*
* The data_size is tricky. On entry, it is always exactly 4.
* The returned data, however, can be up to 4+255*SECTOR_SIZE.
*/
const explain_iocontrol_t explain_iocontrol_hdio_drive_cmd =
{
"HDIO_DRIVE_CMD", /* name */
HDIO_DRIVE_CMD, /* value */
0, /* disambiguate */
0, /* print_name */
print_data,
print_explanation,
print_data_returned,
sizeof(unsigned char[4]), /* data_size */
"unsigned char[4]", /* data_type */
IOCONTROL_FLAG_SIZE_DOES_NOT_AGREE, /* flags */
__FILE__,
__LINE__,
};
#else /* ndef HDIO_DRIVE_CMD */
const explain_iocontrol_t explain_iocontrol_hdio_drive_cmd =
{
0, /* name */
0, /* value */
0, /* disambiguate */
0, /* print_name */
0, /* print_data */
0, /* print_explanation */
0, /* print_data_returned */
0, /* data_size */
0, /* data_type */
0, /* flags */
__FILE__,
__LINE__,
};
#endif /* HDIO_DRIVE_CMD */
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