githubmirror/lsof

lib/fino.c
133 строки3 KB
Chen
Expose functionality as a re-usable library - Part 2 (#284)
12 апр 2023, 09:01
12 апр 2023, 09:016dca348
/*
 * fino.c -- find inode 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.
 */

/*
 * fino.c -- find block (optional) and character device file inode numbers
 *
 * The caller must define:
 *
 *	HASBLKDEV	to activate the block device inode lookup
 */

#include "common.h"
#include "machine.h"

#if defined(HASBLKDEV) || defined(USE_LIB_FIND_CH_INO)

#else  /* !defined(HASBLKDEV) && !defined(USE_LIB_FIND_CH_INO) */
char fino_d1[] = "d";
char *fino_d2 = fino_d1;
#endif /* defined(HASBLKDEV) || defined(USE_LIB_FIND_CH_INO) */

#if defined(HASBLKDEV)
/*
 * find_bl_ino() - find the inode number for a block device file
 */

void find_bl_ino(struct lsof_context *ctx) {
    dev_t ldev, tdev;
    int low, hi, mid;

    readdev(ctx, 0);

#    if defined(HASDCACHE)
find_bl_ino_again:
#    endif /* defined(HASDCACHE) */

    low = mid = 0;
    hi = BNdev - 1;
    if (!Lf->dev_def || (Lf->dev != DevDev) || !Lf->rdev_def)
        return;
    ldev = Lf->rdev;
    while (low <= hi) {
        mid = (low + hi) / 2;
        tdev = BSdev[mid]->rdev;
        if (ldev < tdev)
            hi = mid - 1;
        else if (ldev > tdev)
            low = mid + 1;
        else {

#    if defined(HASDCACHE)
            if (DCunsafe && !BSdev[mid]->v && !vfy_dev(ctx, BSdev[mid]))
                goto find_bl_ino_again;
#    endif /* defined(HASDCACHE) */

            Lf->inode = BSdev[mid]->inode;
            if (Lf->inp_ty == 0)
                Lf->inp_ty = 1;
            return;
        }
    }
}
#endif /* defined(HASBLKDEV) */

#if defined(USE_LIB_FIND_CH_INO)
/*
 * find_ch_ino() - find the inode number for a character device file
 */

void find_ch_ino(struct lsof_context *ctx) {
    dev_t ldev, tdev;
    int low, hi, mid;

    readdev(ctx, 0);

#    if defined(HASDCACHE)
find_ch_ino_again:
#    endif /* defined(HASDCACHE) */

    low = mid = 0;
    hi = Ndev - 1;
    if (!Lf->dev_def || (Lf->dev != DevDev) || !Lf->rdev_def)
        return;
    ldev = Lf->rdev;
    while (low <= hi) {
        mid = (low + hi) / 2;
        tdev = Sdev[mid]->rdev;
        if (ldev < tdev)
            hi = mid - 1;
        else if (ldev > tdev)
            low = mid + 1;
        else {

#    if defined(HASDCACHE)
            if (DCunsafe && !Sdev[mid]->v && !vfy_dev(ctx, Sdev[mid]))
                goto find_ch_ino_again;
#    endif /* defined(HASDCACHE) */

            Lf->inode = Sdev[mid]->inode;
            if (Lf->inp_ty == 0)
                Lf->inp_ty = 1;
            return;
        }
    }
}
#endif /* defined(USE_LIB_FIND_CH_INO) */