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hotplug2: procd does the hotplugging now

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Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 36987
This commit is contained in:
John Crispin 2013-06-21 16:52:56 +00:00
parent e3dcf2448f
commit 08de6fcc12
9 changed files with 0 additions and 794 deletions
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66
package/hotplug2/Makefile
View file

@ -1,66 +0,0 @@
#
# Copyright (C) 2006-2011 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
PKG_NAME:=hotplug2
PKG_REV:=201
PKG_VERSION:=$(PKG_REV)
PKG_RELEASE:=4
PKG_SOURCE_PROTO:=svn
PKG_SOURCE_VERSION:=$(PKG_REV)
PKG_SOURCE_SUBDIR:=hotplug2-$(PKG_VERSION)
PKG_SOURCE_URL:=http://svn.nomi.cz/svn/isteve/hotplug2
PKG_SOURCE:=$(PKG_SOURCE_SUBDIR).tar.gz
PKG_MAINTAINER:=Felix Fietkau <nbd@openwrt.org>
#PKG_SOURCE_URL:=http://isteve.bofh.cz/~isteve/hotplug2
#PKG_MD5SUM:=ea2c01d027b4002e4e6b0ff266f51a51
include $(INCLUDE_DIR)/package.mk
define Package/hotplug2
SECTION:=base
CATEGORY:=Base system
VERSION:=1.0-beta-$(PKG_RELEASE)
TITLE:=Version 1.0 Dynamic device management subsystem for embedded systems
URL:=http://isteve.bofh.cz/~isteve/hotplug2/
DEPENDS:=+USE_EGLIBC:libbsd @!PROCD_INIT
endef
define Package/hotplug2/description
Hotplug2 is a trivial replacement of some of the UDev functionality
in a tiny pack, intended for Linux early userspace: Init RAM FS and InitRD.
This is an implementation of Hotplug2-1.0-beta
endef
define Package/hotplug2/conffiles
/etc/hotplug2.rules
endef
MAKE_FLAGS += \
COPTS="$(TARGET_CFLAGS)" \
STATIC_WORKER="fork"
ifneq ($(CONFIG_USE_EGLIBC),)
TARGET_LDFLAGS += -lbsd
endif
define Build/Compile
$(call Build/Compile/Default)
$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) -o $(PKG_BUILD_DIR)/udevtrigger src/udevtrigger.c
endef
define Package/hotplug2/install
$(INSTALL_DIR) $(1)/etc
$(INSTALL_DATA) ./files/hotplug2.rules $(1)/etc/
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/udevtrigger $(1)/sbin/
$(INSTALL_BIN) $(PKG_BUILD_DIR)/hotplug2 $(1)/sbin/
endef
$(eval $(call BuildPackage,hotplug2))

10
package/hotplug2/files/hotplug2.rules
View file

@ -1,10 +0,0 @@
$include /etc/hotplug2-common.rules
SUBSYSTEM ~~ (^net$|^input$|^button$|^usb$|^ieee1394$|^block$|^atm$|^zaptel$|^tty$) {
exec /sbin/hotplug-call %SUBSYSTEM%
}
DEVICENAME == watchdog {
exec /sbin/watchdog -t 5 /dev/watchdog
next-event
}

63
package/hotplug2/patches/100-env_memleak.patch
View file

@ -1,63 +0,0 @@
--- a/action.c
+++ b/action.c
@@ -31,6 +31,30 @@ static void action_dumb(const struct set
}
/**
+ * Creates a "key=value" string from the given key and value
+ *
+ * @1 Key
+ * @2 Value
+ *
+ * Returns: Newly allocated string in "key=value" form
+ *
+ */
+static char* alloc_env(const char *key, const char *value) {
+ size_t keylen, vallen;
+ char *combined;
+
+ keylen = strlen(key);
+ vallen = strlen(value) + 1;
+
+ combined = xmalloc(keylen + vallen + 1);
+ memcpy(combined, key, keylen);
+ combined[keylen] = '=';
+ memcpy(&combined[keylen + 1], value, vallen);
+
+ return combined;
+}
+
+/**
* Choose what action should be taken according to passed settings.
*
* @1 Hotplug settings
@@ -41,16 +65,25 @@ static void action_dumb(const struct set
*/
void action_perform(struct settings_t *settings, struct uevent_t *event) {
int i;
+ char **env;
+
+ env = xmalloc(sizeof(char *) * event->env_vars_c);
+
+ for (i = 0; i < event->env_vars_c; i++) {
+ env[i] = alloc_env(event->env_vars[i].key, event->env_vars[i].value);
+ putenv(env[i]);
+ }
- for (i = 0; i < event->env_vars_c; i++)
- setenv(event->env_vars[i].key, event->env_vars[i].value, 1);
-
if (settings->dumb == 0) {
ruleset_execute(&settings->rules, event, settings);
} else {
action_dumb(settings, event);
}
- for (i = 0; i < event->env_vars_c; i++)
+ for (i = 0; i < event->env_vars_c; i++) {
unsetenv(event->env_vars[i].key);
+ free(env[i]);
+ }
+
+ free(env);
}

20
package/hotplug2/patches/110-static_worker.patch
View file

@ -1,20 +0,0 @@
--- a/common.mak
+++ b/common.mak
@@ -1,7 +1,7 @@
# vim:set sw=8 nosta:
COPTS=-Os -Wall -g
-LDFLAGS=-g -ldl
+LDFLAGS=-g
CFLAGS=$(COPTS)
FPIC=-fPIC
--- a/Makefile
+++ b/Makefile
@@ -40,5 +40,6 @@ ifdef STATIC_WORKER
CFLAGS += -DSTATIC_WORKER=1
else
CFLAGS += $(FPIC)
+ LDFLAGS += -ldl
endif

14
package/hotplug2/patches/120-sysfs_path_fix.patch
View file

@ -1,14 +0,0 @@
--- a/rules/command.c
+++ b/rules/command.c
@@ -374,9 +374,9 @@ RULES_COMMAND_F(cmd_firmware) {
if (firmware == NULL)
return -1;
- if (snprintf(sysfs_path_loading, PATH_MAX, "/sysfs%s/loading", devpath) >= PATH_MAX)
+ if (snprintf(sysfs_path_loading, PATH_MAX, "/sys%s/loading", devpath) >= PATH_MAX)
return -1;
- if (snprintf(sysfs_path_data, PATH_MAX, "/sysfs%s/data", devpath) >= PATH_MAX)
+ if (snprintf(sysfs_path_data, PATH_MAX, "/sys%s/data", devpath) >= PATH_MAX)
return -1;
if (snprintf(firmware_path, PATH_MAX, "%s/%s", argv[0], firmware) >= PATH_MAX)
return -1;

18
package/hotplug2/patches/130-cancel_download_fix.patch
View file

@ -1,18 +0,0 @@
--- a/rules/command.c
+++ b/rules/command.c
@@ -385,13 +385,13 @@ RULES_COMMAND_F(cmd_firmware) {
infp = fopen(firmware_path, "r");
if (infp == NULL) {
- echo_to_file(sysfs_path_loading, "0\n", 2);
+ echo_to_file(sysfs_path_loading, "-1\n", 2);
return -1;
}
outfp = fopen(sysfs_path_data, "w");
if (outfp == NULL) {
fclose(infp);
- echo_to_file(sysfs_path_loading, "0\n", 2);
+ echo_to_file(sysfs_path_loading, "-1\n", 2);
return -1;
}

237
package/hotplug2/patches/140-worker_fork_fix.patch
View file

@ -1,237 +0,0 @@
--- a/action.c
+++ b/action.c
@@ -39,7 +39,7 @@ static void action_dumb(const struct set
* Returns: Newly allocated string in "key=value" form
*
*/
-static char* alloc_env(const char *key, const char *value) {
+char* alloc_env(const char *key, const char *value) {
size_t keylen, vallen;
char *combined;
--- a/action.h
+++ b/action.h
@@ -12,5 +12,6 @@
#include "settings.h"
void action_perform(struct settings_t *, struct uevent_t *);
+char* alloc_env(const char *, const char *);
#endif /* ifndef ACTION_H */
--- a/workers/worker_fork.c
+++ b/workers/worker_fork.c
@@ -1,6 +1,69 @@
#include "worker_fork.h"
static struct worker_fork_ctx_t *global_ctx;
+static struct worker_fork_uevent_t *uevent_list;
+
+static void worker_fork_uevent_free(struct worker_fork_uevent_t *node) {
+ uevent_free(node->uevent);
+ free(node);
+}
+
+static void worker_fork_uevent_add(void *in_ctx, struct uevent_t *uevent) {
+ char **env;
+ int i;
+ struct worker_fork_ctx_t *ctx = in_ctx;
+ struct worker_fork_uevent_t *node, *walker;
+
+ node = malloc(sizeof (struct worker_fork_uevent_t));
+ node->uevent = uevent_dup(uevent);
+ node->next = NULL;
+
+ if (!uevent_list) uevent_list = node;
+ else {
+ /*
+ * Put events that need to fork first and in reverse order
+ */
+ env = xmalloc(sizeof(char *) * node->uevent->env_vars_c);
+ for (i = 0; i < node->uevent->env_vars_c; i++) {
+ env[i] = alloc_env(node->uevent->env_vars[i].key, node->uevent->env_vars[i].value);
+ putenv(env[i]);
+ }
+ if (ruleset_flags(&ctx->settings->rules, uevent) & FLAG_SLOW) {
+ node->next = uevent_list;
+ uevent_list = node;
+ }
+ else {
+ for (walker = uevent_list; walker->next; walker = walker->next);
+ walker->next = node;
+ }
+ for (i = 0; i < node->uevent->env_vars_c; i++) {
+ unsetenv(node->uevent->env_vars[i].key);
+ free(env[i]);
+ }
+ free(env);
+ }
+}
+
+static void worker_fork_uevent_del(struct worker_fork_uevent_t *node) {
+ struct worker_fork_uevent_t *walker;
+
+ if (node == uevent_list) {
+ uevent_list = node->next;
+ }
+ else {
+ for (walker = uevent_list; walker->next; walker = walker->next)
+ if (walker->next == node) walker->next = node->next;
+ }
+ worker_fork_uevent_free(node);
+}
+
+static void worker_fork_uevent_empty(void) {
+ struct worker_fork_uevent_t *walker;
+
+ if (!uevent_list) return;
+ for (walker = uevent_list; walker->next; walker = walker->next) worker_fork_uevent_free(walker);
+ uevent_list = NULL;
+}
/**
* Destroys data structures related to the given child ID (not PID).
@@ -315,6 +378,8 @@ static void *worker_fork_init(struct set
struct worker_fork_ctx_t *ctx;
PRINTFUNC();
+ uevent_list = NULL;
+
ctx = malloc(sizeof(struct worker_fork_ctx_t));
ctx->children = NULL;
ctx->children_count = 0;
@@ -376,26 +441,39 @@ static void worker_fork_deinit(void *in_
free(ctx->children);
free(ctx);
global_ctx = NULL;
+ worker_fork_uevent_empty();
}
static int worker_fork_process(void *in_ctx, struct uevent_t *uevent) {
+ char **env;
int i;
struct worker_fork_child_t *child;
struct worker_fork_ctx_t *ctx = in_ctx;
+ struct worker_fork_uevent_t *node, *walker;
+ event_seqnum_t seqnum;
+
+ worker_fork_uevent_add(ctx, uevent);
+ walker = uevent_list;
/*
- * A big loop, because if we fail to process the event,
+ * A big loop, because if we fail to process the events,
* we don't want to give up.
*
* TODO: Decide if we want to limit the number of attempts
* or set a time limit before reporting terminal failure.
*/
do {
+ /*
+ * If more events are waiting, return to receive them
+ */
+ if (!seqnum_get(&seqnum) && seqnum > uevent->seqnum) break;
+
+ node = walker;
worker_fork_update_children(ctx);
child = NULL;
- for (i = 0; i < ctx->children_count; i++) {
+ for (i = 0; i < ctx->children_count && i < ctx->max_children; i++) {
if (ctx->children[i]->busy == 0) {
child = ctx->children[i];
break;
@@ -406,21 +484,40 @@ static int worker_fork_process(void *in_
* No child process is currently available.
*/
if (child == NULL) {
+ bool is_slow;
+
+ env = xmalloc(sizeof(char *) * node->uevent->env_vars_c);
+ for (i = 0; i < node->uevent->env_vars_c; i++) {
+ env[i] = alloc_env(node->uevent->env_vars[i].key, node->uevent->env_vars[i].value);
+ putenv(env[i]);
+ }
+
+ is_slow = !!(ruleset_flags(&ctx->settings->rules, node->uevent) & FLAG_MASK_SLOW);
+
+ for (i = 0; i < node->uevent->env_vars_c; i++) {
+ unsetenv(node->uevent->env_vars[i].key);
+ free(env[i]);
+ }
+ free(env);
+
/*
* Are the matching rules trivial enough that we
* can execute them in the main process?
*/
- if (ctx->always_fork == 0 && ctx->settings->dumb == 0 &&
- (ruleset_flags(&ctx->settings->rules, uevent) & FLAG_MASK_SLOW) == 0) {
- action_perform(ctx->settings, uevent);
+ if (ctx->always_fork == 0 && ctx->settings->dumb == 0 && !is_slow) {
+ action_perform(ctx->settings, node->uevent);
+ walker = walker->next;
+ worker_fork_uevent_del(node);
+ if (walker) continue;
break;
}
-
+
/*
* We have to fork off a new child.
*/
if (ctx->children_count < ctx->max_children)
child = worker_fork_spawn(ctx);
+
}
/*
@@ -428,9 +525,14 @@ static int worker_fork_process(void *in_
*/
if (child != NULL) {
child->busy = 1;
- if (!worker_fork_relay_event(child->event_fd, uevent));
- break;
- child->busy = 0;
+ if (worker_fork_relay_event(child->event_fd, node->uevent)) {
+ child->busy = 0;
+ continue;
+ }
+ walker = walker->next;
+ worker_fork_uevent_del(node);
+ if (walker) continue;
+ break;
}
/*
--- a/uevent.c
+++ b/uevent.c
@@ -132,6 +132,8 @@ struct uevent_t *uevent_dup(const struct
dest = xmalloc(sizeof(struct uevent_t));
dest->action = src->action;
+ dest->seqnum = src->seqnum;
+ dest->action_str = strdup(src->action_str);
dest->env_vars_c = src->env_vars_c;
dest->env_vars = xmalloc(sizeof(struct env_var_t) * dest->env_vars_c);
dest->plain_s = src->plain_s;
--- a/workers/worker_fork.h
+++ b/workers/worker_fork.h
@@ -5,6 +5,7 @@
#include <sys/types.h>
#include <sys/select.h>
#include <unistd.h>
+#include <stdbool.h>
#include "../rules/execution.h"
@@ -35,4 +36,9 @@ struct worker_fork_ctx_t {
struct settings_t *settings;
};
+struct worker_fork_uevent_t {
+ struct uevent_t *uevent;
+ struct worker_fork_uevent_t *next;
+};
+
#endif

21
package/hotplug2/patches/170-non_fatal_include.patch
View file

@ -1,21 +0,0 @@
Index: hotplug2-201/parser/parser.c
===================================================================
--- hotplug2-201.orig/parser/parser.c 2009-12-09 19:44:13.000000000 +0100
+++ hotplug2-201/parser/parser.c 2011-02-08 18:06:44.681213713 +0100
@@ -1,5 +1,7 @@
#include "parser.h"
+#include <errno.h>
+
/*
* Grammar:
* input => directive // TOKEN_ROOTKW
@@ -578,7 +580,7 @@
ctx.lexer.fp = fopen(filename, "r");
if (ctx.lexer.fp == NULL) {
parser_clear(&ctx);
- return -1;
+ return (errno == ENOENT) ? 0 : -1;
}
ctx.lexer.filename = strdup(filename);

345
package/hotplug2/src/udevtrigger.c
View file

@ -1,345 +0,0 @@
/*
* Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
* Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
*
* 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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/types.h>
#define PATH_SIZE 512
static int verbose;
static int dry_run;
void log_message(int priority, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#undef err
#define err(format, arg...) \
do { \
log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
} while (0)
#undef info
#define info(format, arg...) \
do { \
log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
} while (0)
#ifdef DEBUG
#undef dbg
#define dbg(format, arg...) \
do { \
log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
} while (0)
#else
#define dbg(...) do {} while(0)
#endif
static void trigger_uevent(const char *devpath)
{
char filename[PATH_SIZE];
int fd;
strlcpy(filename, "/sys", sizeof(filename));
strlcat(filename, devpath, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (verbose)
printf("%s\n", devpath);
if (dry_run)
return;
fd = open(filename, O_WRONLY);
if (fd < 0) {
dbg("error on opening %s: %s\n", filename, strerror(errno));
return;
}
if (write(fd, "add", 3) < 0)
info("error on triggering %s: %s\n", filename, strerror(errno));
close(fd);
}
static int sysfs_resolve_link(char *devpath, size_t size)
{
char link_path[PATH_SIZE];
char link_target[PATH_SIZE];
int len;
int i;
int back;
strlcpy(link_path, "/sys", sizeof(link_path));
strlcat(link_path, devpath, sizeof(link_path));
len = readlink(link_path, link_target, sizeof(link_target));
if (len <= 0)
return -1;
link_target[len] = '\0';
dbg("path link '%s' points to '%s'", devpath, link_target);
for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
;
dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
for (i = 0; i <= back; i++) {
char *pos = strrchr(devpath, '/');
if (pos == NULL)
return -1;
pos[0] = '\0';
}
dbg("after moving back '%s'", devpath);
strlcat(devpath, "/", size);
strlcat(devpath, &link_target[back * 3], size);
return 0;
}
static int device_list_insert(const char *path)
{
char filename[PATH_SIZE];
char devpath[PATH_SIZE];
struct stat statbuf;
dbg("add '%s'" , path);
/* we only have a device, if we have an uevent file */
strlcpy(filename, path, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (stat(filename, &statbuf) < 0)
return -1;
if (!(statbuf.st_mode & S_IWUSR))
return -1;
strlcpy(devpath, &path[4], sizeof(devpath));
/* resolve possible link to real target */
if (lstat(path, &statbuf) < 0)
return -1;
if (S_ISLNK(statbuf.st_mode))
if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
return -1;
trigger_uevent(devpath);
return 0;
}
static void scan_subsystem(const char *subsys)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, "/sys/", sizeof(base));
strlcat(base, subsys, sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
strlcat(dirname, "/devices", sizeof(dirname));
/* look for devices */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_block(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, "/sys/block", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
if (device_list_insert(dirname) != 0)
continue;
/* look for partitions */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name,"device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_class(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, "/sys/class", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name, "device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
int main(int argc, char *argv[], char *envp[])
{
char base[PATH_SIZE];
struct stat statbuf;
int failed = 0;
int option;
openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
while (1) {
option = getopt(argc, argv, "vnh");
if (option == -1)
break;
switch (option) {
case 'v':
verbose = 1;
break;
case 'n':
dry_run = 1;
break;
case 'h':
printf("Usage: udevtrigger OPTIONS\n"
" -v print the list of devices while running\n"
" -n do not actually trigger the events\n"
" -h print this text\n"
"\n");
goto exit;
default:
goto exit;
}
}
/* if we have /sys/subsystem, forget all the old stuff */
scan_subsystem("bus");
scan_class();
/* scan "block" if it isn't a "class" */
strlcpy(base, "/sys/class/block", sizeof(base));
if (stat(base, &statbuf) != 0)
scan_block();
exit:
closelog();
return 0;
}