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/*
* libexplain - Explain errno values returned by libc functions
* Copyright (C) 2009, 2010 Peter Miller
* Written by Peter Miller <pmiller@opensource.org.au>
*
* 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 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/errno.h>
#include <libexplain/ac/fcntl.h>
#include <libexplain/ac/stdio.h>
#include <libexplain/ac/sys/ioctl.h> /* for ioctl() except Solaris */
#include <libexplain/ac/unistd.h> /* for ioctl() on Solaris */
#include <libexplain/iocontrol/generic.h>
#include <libexplain/open.h>
#include <libexplain/close.h>
#include <ioctl-scan/probe.h>
static void
report(int fildes, int request, void *data)
{
const explain_iocontrol_t *p;
char name[50];
p = explain_iocontrol_find_by_number(fildes, request, data);
explain_iocontrol_fake_syscall_name(name, sizeof(name), p, request);
printf("%s\n", name);
}
static inline int
size_incr(int size)
{
if (size < 0)
return 0;
if (size == 1)
return 2;
if (size == 2 || size == 3)
return 4;
return ((size + 4) & -4);
}
#ifndef _IOC_TYPEMASK
#define _IOC_TYPEMASK 255
#endif
#ifndef _IOC_NRMASK
#define _IOC_NRMASK 255
#endif
#ifndef _IOC_DIRMASK
# ifdef IOC_DIRMASK
# define _IOC_DIRMASK (int)(IOC_DIRMASK)
# else
# define _IOC_DIRMASK 3
# endif
#endif
#ifndef _IOC_SIZEMASK
# ifdef IOCPARM_MASK
# define _IOC_SIZEMASK IOCPARM_MASK
# else
# define _IOC_SIZEMASK 0x1FFF
# endif
#endif
#ifndef _IOC
#define _IOC(dir, type, nr, size) \
(((dir)*0) + ((type) << 8) + (nr) + ((size)*0))
#endif
#define minbit(x) ((x) & -(x))
void
probe(const char *pathname)
{
int fildes;
void *data;
int type;
int bol;
data = (void *)0x12345;
fildes = explain_open_or_die(pathname, O_RDONLY | O_NONBLOCK, 0);
bol = 1;
for (type = 0; type <= _IOC_TYPEMASK; ++type)
{
int nr;
fprintf(stderr, "\r%3d of %d ", type, _IOC_TYPEMASK + 1);
fflush(stderr);
bol = 0;
for (nr = 0; nr <= _IOC_NRMASK; ++nr)
{
int dir;
for (dir = 0; dir <= _IOC_DIRMASK; dir += minbit(_IOC_DIRMASK))
{
int size;
for (size = 0; size <= _IOC_SIZEMASK; size = size_incr(size))
{
int request;
request = _IOC(dir, type, nr, size);
if (ioctl(fildes, request, data) >= 0)
{
/* This one worked. Hope it didn't make a mess */
if (!bol)
{
fprintf(stderr, "\r\33[K");
bol = 1;
}
report(fildes, request, data);
}
else
{
switch (errno)
{
case ENOSYS:
#if defined(EOPNOTSUPP) && (ENOSYS != EOPNOTSUPP)
case EOPNOTSUPP:
#endif
case ENOTTY:
#ifdef ENOIOCTLCMD
case ENOIOCTLCMD:
#endif
#ifdef ENOIOCTL
case ENOIOCTL:
#endif
/* definitely does not exist */
break;
case EINVAL:
/*
* Some (old) broken device drivers report
* these instead of ENOTTY like they are
* supposed to. Assume it means "no".
*/
break;
case EFAULT:
case EPERM:
case EACCES:
default:
/* definitely exists */
if (!bol)
{
fprintf(stderr, "\r\33[K");
bol = 1;
}
report(fildes, request, data);
break;
}
}
}
}
}
}
explain_close_or_die(fildes);
if (!bol)
fprintf(stderr, "\r\33[K");
}
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