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/*
* udevstart.c
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* Quick and dirty way to populate a /dev with udev if your system
* does not have access to a shell. Based originally on a patch to udev
* from Harald Hoyer <harald@redhat.com>
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>
#include "logging.h"
#include "udev_lib.h"
#include "list.h"
#include "udev.h"
#define MAX_PATHLEN 1024
#define SYSBLOCK "/sys/block"
#define SYSCLASS "/sys/class"
struct device {
struct list_head list;
char path[MAX_PATHLEN];
char subsys[MAX_PATHLEN];
};
/* sort files in lexical order */
static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
{
struct device *loop_device;
struct device *new_device;
list_for_each_entry(loop_device, device_list, list) {
if (strcmp(loop_device->path, path) > 0) {
break;
}
}
new_device = malloc(sizeof(struct device));
if (new_device == NULL) {
dbg("error malloc");
return -ENOMEM;
}
strfieldcpy(new_device->path, path);
strfieldcpy(new_device->subsys, subsystem);
list_add_tail(&new_device->list, &loop_device->list);
return 0;
}
static void udev_exec(const char *path, const char* subsystem)
{
/* Setup env variables. */
setenv("UDEV_NO_SLEEP", "1", 1);
/* Now call __udev_hotplug(). */
if (__udev_hotplug("add", path, subsystem)) {
dbg("Calling of udev_hotplug failed");
exit(1);
}
}
/* list of devices that we should run last due to any one of a number of reasons */
static char *last_list[] = {
"/block/dm", /* on here because dm wants to have the block devices around before it */
NULL,
};
static void exec_list(struct list_head *device_list)
{
struct device *loop_device;
struct device *tmp_device;
/* handle the devices we are allowed to, excluding the "last" type devices */
list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
int found = 0;
int i;
for (i=0; last_list[i] != NULL; i++) {
if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
found = 1;
break;
}
}
if (found)
continue;
udev_exec(loop_device->path, loop_device->subsys);
list_del(&loop_device->list);
free(loop_device);
}
/* handle the rest of the devices left over, if any */
list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
udev_exec(loop_device->path, loop_device->subsys);
list_del(&loop_device->list);
free(loop_device);
}
}
static void udev_scan_block(void)
{
DIR *dir;
struct dirent *dent;
LIST_HEAD(device_list);
dir = opendir(SYSBLOCK);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[MAX_PATHLEN];
DIR *dir2;
struct dirent *dent2;
if ((strcmp(dent->d_name, ".") == 0) ||
(strcmp(dent->d_name, "..") == 0))
continue;
snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
dirname[MAX_PATHLEN-1] = '\0';
device_list_insert(dirname, "block", &device_list);
snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[MAX_PATHLEN];
DIR *dir3;
struct dirent *dent3;
if ((strcmp(dent2->d_name, ".") == 0) ||
(strcmp(dent2->d_name, "..") == 0))
continue;
snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
dirname2[MAX_PATHLEN-1] = '\0';
dir3 = opendir(dirname2);
if (dir3 != NULL) {
for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
char filename[MAX_PATHLEN];
if (strcmp(dent3->d_name, "dev") == 0) {
snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
dent->d_name, dent2->d_name);
filename[MAX_PATHLEN-1] = '\0';
device_list_insert(filename, "block", &device_list);
}
}
closedir(dir3);
}
}
closedir(dir2);
}
}
closedir(dir);
}
exec_list(&device_list);
}
static void udev_scan_class(void)
{
DIR *dir;
struct dirent *dent;
LIST_HEAD(device_list);
dir = opendir(SYSCLASS);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[MAX_PATHLEN];
DIR *dir2;
struct dirent *dent2;
if ((strcmp(dent->d_name, ".") == 0) ||
(strcmp(dent->d_name, "..") == 0))
continue;
snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
dirname[MAX_PATHLEN-1] = '\0';
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[MAX_PATHLEN-1];
DIR *dir3;
struct dirent *dent3;
if ((strcmp(dent2->d_name, ".") == 0) ||
(strcmp(dent2->d_name, "..") == 0))
continue;
snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
dirname2[MAX_PATHLEN-1] = '\0';
dir3 = opendir(dirname2);
if (dir3 != NULL) {
for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
char filename[MAX_PATHLEN];
if (strcmp(dent3->d_name, "dev") == 0) {
snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
dent->d_name, dent2->d_name);
filename[MAX_PATHLEN-1] = '\0';
device_list_insert(filename, dent->d_name, &device_list);
}
}
closedir(dir3);
}
}
closedir(dir2);
}
}
closedir(dir);
}
exec_list(&device_list);
}
int udev_start(void)
{
udev_scan_class();
udev_scan_block();
return 0;
}
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