diff options
Diffstat (limited to 'lib/lkud.c')
| -rw-r--r-- | lib/lkud.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/lib/lkud.c b/lib/lkud.c new file mode 100644 index 0000000..268af4f --- /dev/null +++ b/lib/lkud.c @@ -0,0 +1,207 @@ +/* + * 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) */ |