source: MondoRescue/branches/2.2.2/mindi-busybox/modutils/lsmod.c@ 1247

/* vi: set sw=4 ts=4: */
/*
 * Mini lsmod implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and
 * Nicolas Ferre <nicolas.ferre@alcove.fr> to support pre 2.1 kernels
 * (which lack the query_module() interface).
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "busybox.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include <assert.h>
#include <getopt.h>
#include <sys/utsname.h>
#include <sys/file.h>


#ifndef CONFIG_FEATURE_CHECK_TAINTED_MODULE
static inline void check_tainted(void) { printf("\n"); }
#else
#define TAINT_FILENAME                  "/proc/sys/kernel/tainted"
#define TAINT_PROPRIETORY_MODULE        (1<<0)
#define TAINT_FORCED_MODULE             (1<<1)
#define TAINT_UNSAFE_SMP                (1<<2)

static void check_tainted(void)
{
    int tainted;
    FILE *f;

    tainted = 0;
    if ((f = fopen(TAINT_FILENAME, "r"))) {
        fscanf(f, "%d", &tainted);
        fclose(f);
    }
    if (f && tainted) {
        printf("    Tainted: %c%c%c\n",
                tainted & TAINT_PROPRIETORY_MODULE      ? 'P' : 'G',
                tainted & TAINT_FORCED_MODULE           ? 'F' : ' ',
                tainted & TAINT_UNSAFE_SMP              ? 'S' : ' ');
    }
    else {
        printf("    Not tainted\n");
    }
}
#endif

#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE

struct module_info
{
    unsigned long addr;
    unsigned long size;
    unsigned long flags;
    long usecount;
};


int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);

enum {
/* Values for query_module's which.  */
    QM_MODULES = 1,
    QM_DEPS = 2,
    QM_REFS = 3,
    QM_SYMBOLS = 4,
    QM_INFO = 5,

/* Bits of module.flags.  */
    NEW_MOD_RUNNING = 1,
    NEW_MOD_DELETED = 2,
    NEW_MOD_AUTOCLEAN = 4,
    NEW_MOD_VISITED = 8,
    NEW_MOD_USED_ONCE = 16,
    NEW_MOD_INITIALIZING = 64
};

int lsmod_main(int argc, char **argv)
{
    struct module_info info;
    char *module_names, *mn, *deps, *dn;
    size_t bufsize, depsize, nmod, count, i, j;

    module_names = xmalloc(bufsize = 256);
    if (my_query_module(NULL, QM_MODULES, &module_names, &bufsize, &nmod)) {
        bb_perror_msg_and_die("QM_MODULES");
    }

    deps = xmalloc(depsize = 256);
    printf("Module                  Size  Used by");
    check_tainted();

    for (i = 0, mn = module_names; i < nmod; mn += strlen(mn) + 1, i++) {
        if (query_module(mn, QM_INFO, &info, sizeof(info), &count)) {
            if (errno == ENOENT) {
                /* The module was removed out from underneath us. */
                continue;
            }
            /* else choke */
            bb_perror_msg_and_die("module %s: QM_INFO", mn);
        }
        if (my_query_module(mn, QM_REFS, &deps, &depsize, &count)) {
            if (errno == ENOENT) {
                /* The module was removed out from underneath us. */
                continue;
            }
            bb_perror_msg_and_die("module %s: QM_REFS", mn);
        }
        printf("%-20s%8lu%4ld", mn, info.size, info.usecount);
        if (info.flags & NEW_MOD_DELETED)
            printf(" (deleted)");
        else if (info.flags & NEW_MOD_INITIALIZING)
            printf(" (initializing)");
        else if (!(info.flags & NEW_MOD_RUNNING))
            printf(" (uninitialized)");
        else {
            if (info.flags & NEW_MOD_AUTOCLEAN)
                printf(" (autoclean) ");
            if (!(info.flags & NEW_MOD_USED_ONCE))
                printf(" (unused)");
        }
        if (count) printf(" [");
        for (j = 0, dn = deps; j < count; dn += strlen(dn) + 1, j++) {
            printf("%s%s", dn, (j==count-1)? "":" ");
        }
        if (count) printf("]");

        printf("\n");
    }

#ifdef CONFIG_FEATURE_CLEAN_UP
    free(module_names);
#endif

    return( 0);
}

#else /* CONFIG_FEATURE_QUERY_MODULE_INTERFACE */

int lsmod_main(int argc, char **argv)
{
    printf("Module                  Size  Used by");
    check_tainted();
#if defined(CONFIG_FEATURE_LSMOD_PRETTY_2_6_OUTPUT)
    {
      FILE *file;
      char line[4096];

      file = bb_xfopen("/proc/modules", "r");

      while (fgets(line, sizeof(line), file)) {
        char *tok;

        tok = strtok(line, " \t");
        printf("%-19s", tok);
        tok = strtok(NULL, " \t\n");
        printf(" %8s", tok);
        tok = strtok(NULL, " \t\n");
        /* Null if no module unloading support. */
        if (tok) {
          printf("  %s", tok);
          tok = strtok(NULL, "\n");
          if (!tok)
        tok = "";
          /* New-style has commas, or -.  If so,
         truncate (other fields might follow). */
          else if (strchr(tok, ',')) {
        tok = strtok(tok, "\t ");
        /* Strip trailing comma. */
        if (tok[strlen(tok)-1] == ',')
          tok[strlen(tok)-1] = '\0';
          } else if (tok[0] == '-'
             && (tok[1] == '\0' || isspace(tok[1])))
        tok = "";
          printf(" %s", tok);
        }
        printf("\n");
      }
      fclose(file);
    }
    return EXIT_SUCCESS;
#else
    if (bb_xprint_file_by_name("/proc/modules") == 0)
        return EXIT_SUCCESS;
#endif  /*  CONFIG_FEATURE_2_6_MODULES  */

    return EXIT_FAILURE;
}

#endif /* CONFIG_FEATURE_QUERY_MODULE_INTERFACE */