/*

 * kmod-lsmod - list modules from linux kernel using libkmod.

 *

 * Copyright (C) 2011-2013  ProFUSION embedded systems

 *

 * 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 2 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 <errno.h>

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <libkmod/libkmod.h>

#include "kmod.h"

static int do_lsmod(int argc, char *argv[])

{

	struct kmod_ctx *ctx;

	const char *null_config = NULL;

	struct kmod_list *list, *itr;

	int err;

	if (argc != 1) {

		fprintf(stderr, "Usage: %s\n", argv[0]);

		return EXIT_FAILURE;

	}

	ctx = kmod_new(NULL, &null_config);

	if (ctx == NULL) {

		fputs("Error: kmod_new() failed!\n", stderr);

		return EXIT_FAILURE;

	}

	err = kmod_module_new_from_loaded(ctx, &list);

	if (err < 0) {

		fprintf(stderr, "Error: could not get list of modules: %s\n",

			strerror(-err));

		kmod_unref(ctx);

		return EXIT_FAILURE;

	}

	puts("Module                  Size  Used by");

	kmod_list_foreach(itr, list) {

		struct kmod_module *mod = kmod_module_get_module(itr);

		const char *name = kmod_module_get_name(mod);

		int use_count = kmod_module_get_refcnt(mod);

		long size = kmod_module_get_size(mod);

		struct kmod_list *holders, *hitr;

		int first = 1;

		printf("%-19s %8ld  %d", name, size, use_count);

		holders = kmod_module_get_holders(mod);

		kmod_list_foreach(hitr, holders) {

			struct kmod_module *hm = kmod_module_get_module(hitr);

			if (!first) {

				putchar(',');

			} else {

				putchar(' ');

				first = 0;

			}

			fputs(kmod_module_get_name(hm), stdout);

			kmod_module_unref(hm);

		}

		putchar('\n');

		kmod_module_unref_list(holders);

		kmod_module_unref(mod);

	}

	kmod_module_unref_list(list);

	kmod_unref(ctx);

	return EXIT_SUCCESS;

}

const struct kmod_cmd kmod_cmd_compat_lsmod = {

	.name = "lsmod",

	.cmd = do_lsmod,

	.help = "compat lsmod command",

};

const struct kmod_cmd kmod_cmd_list = {

	.name = "list",

	.cmd = do_lsmod,

	.help = "list currently loaded modules",

};