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/*
* lkud.c -- device lookup functions for lsof library
*/
/*
* Copyright 1997 Purdue Research Foundation, West Lafayette, Indiana
* 47907. All rights reserved.
*
* Written by Victor A. Abell
*
* This software is not subject to any license of the American Telephone
* and Telegraph Company or the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on
* any computer system, and to alter it and redistribute it freely, subject
* to the following restrictions:
*
* 1. Neither the authors nor Purdue University are responsible for any
* consequences of the use of this software.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Credit to the authors and Purdue
* University must appear in documentation and sources.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 4. This notice may not be removed or altered.
*/
/*
* lkud.c -- lookup device
*
* The caller may define:
*
* HASBLKDEV to activate block device lookup
*/
#include "../machine.h"
#if defined(HASBLKDEV) || defined(USE_LIB_LKUPDEV)
# if !defined(lint)
static char copyright[] =
"@(#) Copyright 1997 Purdue Research Foundation.\nAll rights reserved.\n";
static char *rcsid = "$Id: lkud.c,v 1.7 2008/10/21 16:12:36 abe Exp $";
# endif /* !defined(lint) */
#include "../lsof.h"
#else /* !defined(HASBLKDEV) && !defined(USE_LIB_LKUPDEV) */
char lkud_d1[] = "d"; char *lkud_d2 = lkud_d1;
#endif /* defined(HASBLKDEV) || defined(USE_LIB_LKUPDEV) */
#if defined(HASBLKDEV)
/*
* lkupbdev() - look up a block device
*/
struct l_dev *
lkupbdev(dev, rdev, i, r)
dev_t *dev; /* pointer to device number */
dev_t *rdev; /* pointer to raw device number */
int i; /* inode match status */
int r; /* if 1, rebuild the device cache with
* rereaddev() when no match is found
* and HASDCACHE is defined and
* DCunsafe is one */
{
INODETYPE inode = (INODETYPE)0;
int low, hi, mid;
struct l_dev *dp;
int ty = 0;
if (*dev != DevDev)
return((struct l_dev *)NULL);
readdev(0);
if (i) {
inode = Lf->inode;
ty = Lf->inp_ty;
}
/*
* Search block device table for match.
*/
# if defined(HASDCACHE)
lkupbdev_again:
# endif /* defined(HASDCACHE) */
low = mid = 0;
hi = BNdev - 1;
while (low <= hi) {
mid = (low + hi) / 2;
dp = BSdev[mid];
if (*rdev < dp->rdev)
hi = mid - 1;
else if (*rdev > dp->rdev)
low = mid + 1;
else {
if ((i == 0) || (ty != 1) || (inode == dp->inode)) {
# if defined(HASDCACHE)
if (DCunsafe && !dp->v && !vfy_dev(dp))
goto lkupbdev_again;
# endif /* defined(HASDCACHE) */
return(dp);
}
if (inode < dp->inode)
hi = mid - 1;
else
low = mid + 1;
}
}
# if defined(HASDCACHE)
if (DCunsafe && r) {
(void) rereaddev();
goto lkupbdev_again;
}
# endif /* defined(HASDCACHE) */
return((struct l_dev *)NULL);
}
#endif /* defined(HASBLKDEV) */
#if defined(USE_LIB_LKUPDEV)
/*
* lkupdev() - look up a character device
*/
struct l_dev *
lkupdev(dev, rdev, i, r)
dev_t *dev; /* pointer to device number */
dev_t *rdev; /* pointer to raw device number */
int i; /* inode match status */
int r; /* if 1, rebuild the device cache with
* rereaddev() when no match is found
* and HASDCACHE is defined and
* DCunsafe is one */
{
INODETYPE inode = (INODETYPE)0;
int low, hi, mid;
struct l_dev *dp;
int ty = 0;
if (*dev != DevDev)
return((struct l_dev *)NULL);
readdev(0);
if (i) {
inode = Lf->inode;
ty = Lf->inp_ty;
}
/*
* Search device table for match.
*/
# if defined(HASDCACHE)
lkupdev_again:
# endif /* defined(HASDCACHE) */
low = mid = 0;
hi = Ndev - 1;
while (low <= hi) {
mid = (low + hi) / 2;
dp = Sdev[mid];
if (*rdev < dp->rdev)
hi = mid - 1;
else if (*rdev > dp->rdev)
low = mid + 1;
else {
if ((i == 0) || (ty != 1) || (inode == dp->inode)) {
# if defined(HASDCACHE)
if (DCunsafe && !dp->v && !vfy_dev(dp))
goto lkupdev_again;
# endif /* defined(HASDCACHE) */
return(dp);
}
if (inode < dp->inode)
hi = mid - 1;
else
low = mid + 1;
}
}
# if defined(HASDCACHE)
if (DCunsafe && r) {
(void) rereaddev();
goto lkupdev_again;
}
# endif /* defined(HASDCACHE) */
return((struct l_dev *)NULL);
}
#endif /* defined(USE_LIB_LKUPDEV) */
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