新insmod实现/* vi: set sw=4 ts=4: */
/*
* Mini insmod implementation for busybox
*
* Copyright (C) 2008 Timo Teras <timo.teras@iki.fi>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config INSMOD
//config: bool "insmod (22 kb)"
//config: default y
//config: help
//config: insmod is used to load spec
ified modules in the running kernel.
//applet:
IF_INSMOD(
IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(insmod, insmod, BB_DIR_SBIN, BB_SUID_DROP, insmod)))
//kbuild:
ifneq ($(CONFIG_MODPROBE_SMALL),y)
//kbuild:lib
-$(CONFIG_INSMOD) += insmod.o modutils.o
//kbuild:end
if
#include "libbb.h"
#include "modutils.h"
/* 2.6 style insmod has no options and required filename
* (not module name
- .
ko can't be omitted) */
//usage:#
if !ENABLE_MODPROBE_SMALL
//usage:#define insmod_trivial_usage
//usage:
IF_FEATURE_2_4_MODULES("[
-fkvqLx] MODULE")
//usage:
IF_NOT_FEATURE_2_4_MODULES("FILE")
//usage:
IF_FEATURE_CMDLINE_MODULE_OPTIONS(" [SYMBOL=VALUE]...")
//usage:#define insmod_full_usage "\n\n"
//usage: "Load kernel module"
//usage:
IF_FEATURE_2_4_MODULES( "\n"
//usage: "\n
-f Force module to load into the wrong kernel version"
//usage: "\n
-k Make module autoclean
-able"
//usage: "\n
-v Verbose"
//usage: "\n
-q Quiet"
//usage: "\n
-L Lock: prevent simultaneous loads"
//usage:
IF_FEATURE_INSMOD_LOAD_MAP(
//usage: "\n
-m Output load map to stdout"
//usage: )
//usage: "\n
-x Don't export externs"
//usage: )
//usage:#end
if
int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_
VISIBLE;
int insmod_main(int argc UNUSED_PARAM, char **argv)
{
char *filename;
int rc;
/* Compat note:
* 2.6 style insmod has no options and required filename
* (not module name
- .
ko can't be omitted).
* 2.4 style insmod can take module name without .o
* and performs module search in default directories
* or in $MODPATH.
*/
IF_FEATURE_2_4_MODULES(
getopt32(argv, INSMOD_OPTS INSMOD_ARGS);
argv += optind
- 1;
);
filename = *++argv;
if (!filename)
bb_show_usage();
rc = bb_init_module(filename, parse_cmdline_module_options(argv, /*quote_spaces:*/ 0));
if (rc)
bb_error_msg("can't insert '%s': %s", filename, moderror(rc));
return rc;
}
原实现/* vi: set sw=4 ts=4: */
/*
* Mini insmod implementation for busybox
*
* Copyright (C) 2008 Timo Teras <timo.teras@iki.fi>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//applet:
IF_INSMOD(APPLET(insmod, BB_DIR_SBIN, BB_SUID_DROP))
#include "libbb.h"
#include "modutils.h"
#include <sys/utsname.h>
#
ifndef CONFIG_FEATURE_2_4_MODULES
#include <sys/mman.h>
#include <asm/unistd.h>
#include <sys/syscall.h>
#end
if
static char *g_filename = NULL;
static int FAST_FUNC check_module_name_match(const char *filename, struct stat *statbuf,
void *user
data, int depth)
{
char *fullname = (char *) user
data;
char *tmp;
if (fullname[0] == '\0')
return FALSE;
tmp = bb_get_last_path_component_nostrip(filename);
if (strcmp(tmp, fullname) == 0) {
/* Stop searching
if we find a match */
g_filename = xstrdup(filename);
return FALSE;
}
return TRUE;
}
static int find_module(char *filename)
{
char *module_dir, real_module_dir[FILENAME_MAX];
int len, slen, ret = ENOENT, k_version;
struct utsname myuname;
const char *suffix = ".
ko";
struct stat st;
/* check the kernel version */
if (uname(&myuname) != 0)
return EINVAL;
k_version = myuname.release[0]
- '0';
if (k_version < 2 || k_version > 9)
return EINVAL;
if (k_version == 2) {
int k_patchlevel = myuname.release[2]
- '0';
if (k_patchlevel <= 4)
#
if ENABLE_FEATURE_2_4_MODULES
suffix = ".o";
#else
return EINVAL;
#end
if
}
len = strlen(filename);
slen = strlen(suffix);
/* check for suffix and absolute path first */
if ((len < slen + 2) || (strcmp(filename + len
- slen, suffix) != 0)) {
filename = xasprintf("%s%s", filename, suffix);
} else {
filename = strdup(filename);
if ((stat(filename, &st) == 0) && S_ISREG(st.st_mode)) {
g_filename = filename;
return 0;
}
free(filename);
return ENOENT;
}
/* next: scan /lib/modules/<release> */
/* Jump through hoops in case /lib/modules/`uname
-r`
* is a symlink. We do not want recursive_action to
* follow symlinks, but we do want to follow the
* /lib/modules/`uname
-r` dir, So resolve it ourselves
*
if it is a link... */
/*
** Orig Sentence is "module_dir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, myuname.release);"
** Now there is "iplatform" dir in CONFIG_DEFAULT_MODULES_DIR, and some
ko files in it, so we just scan
** CONFIG_DEFAULT_MODULES_DIR path.
@@ By TengFei, 14/09/02.
*/
module_dir = strdup(CONFIG_DEFAULT_MODULES_DIR);
if (!module_dir)
{
return ENOMEM;
}
if (realpath(module_dir, real_module_dir) != NULL) {
free(module_dir);
module_dir = real_module_dir;
}
recursive_action(module_dir, ACTION_RECURSE,
check_module_name_match, 0, filename, 0);
/* Check
if we have a complete path */
if (g_filename == NULL)
goto done;
if ((stat(g_filename, &st) == 0) && S_ISREG(st.st_mode))
ret = 0;
else
free(g_filename);
done:
free(filename);
return ret;
}
/* 2.6 style insmod has no options and required filename
* (not module name
- .
ko can't be omitted) */
//usage:#
if !ENABLE_MODPROBE_SMALL
//usage:#define insmod_trivial_usage
//usage:
IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
//usage:
IF_NOT_FEATURE_2_4_MODULES("FILE ")
//usage: "[SYMBOL=VALUE]..."
//usage:#define insmod_full_usage "\n\n"
//usage: "Load the spec
ified kernel modules into the kernel"
//usage:
IF_FEATURE_2_4_MODULES( "\n"
//usage: "\n
-f Force module to load into the wrong kernel version"
//usage: "\n
-k Make module autoclean
-able"
//usage: "\n
-v Verbose"
//usage: "\n
-q Quiet"
//usage: "\n
-L Lock: prevent simultaneous loads"
//usage:
IF_FEATURE_INSMOD_LOAD_MAP(
//usage: "\n
-m Output load map to stdout"
//usage: )
//usage: "\n
-x Don't export externs"
//usage: )
//usage:#end
if
int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_
VISIBLE;
int insmod_main(int argc UNUSED_PARAM, char **argv)
{
char *filename;
int rc, opt;
/* Compat note:
* 2.6 style insmod has no options and required filename
* (not module name
- .
ko can't be omitted).
* 2.4 style insmod can take module name without .o
* and performs module search in default directories
* or in $MODPATH.
*/
opt = getopt32(argv, INSMOD_OPTS, NULL, NULL);
argv += optind
- 1;
filename = *++argv;
if (!filename)
bb_show_usage();
rc = find_module(filename);
if (rc || (g_filename == NULL))
goto done;
rc = bb_init_module(g_filename, parse_cmdline_module_options(argv, /*quote_spaces:*/ 0));
if (rc && !(opt & INSMOD_OPT_SILENT))
bb_error_msg("can't insert '%s': %s", filename, moderror(rc));
free (g_filename);
done:
return rc;
}
本文比较了visible和ifbinding两种方式在控制组件动态显示时的区别。ifbinding会改变DOM结构，适用于不需要频繁切换显示状态的情况；而visible则通过CSS实现隐藏，更适合频繁切换。
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