mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-31 07:51:08 +03:00
279 lines
6.7 KiB
C
279 lines
6.7 KiB
C
/*
|
|
* 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"
|
|
|
|
|
|
#ifdef LOG
|
|
unsigned char logname[LOGNAME_SIZE];
|
|
void log_message(int level, const char *format, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, format);
|
|
vsyslog(level, format, args);
|
|
va_end(args);
|
|
}
|
|
#endif
|
|
|
|
|
|
#define MAX_PATHLEN 1024
|
|
#define SYSBLOCK "/sys/block"
|
|
#define SYSCLASS "/sys/class"
|
|
#define UDEV_BIN "/sbin/udev"
|
|
|
|
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)
|
|
{
|
|
pid_t pid;
|
|
char action[] = "ACTION=add";
|
|
char devpath[MAX_PATHLEN];
|
|
char nosleep[] = "UDEV_NO_SLEEP=1";
|
|
char *env[] = { action, devpath, nosleep, NULL };
|
|
|
|
strcpy(devpath, "DEVPATH=");
|
|
strfieldcat(devpath, path);
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0:
|
|
/* child */
|
|
execle(UDEV_BIN, "udev", subsystem, NULL, env);
|
|
dbg("exec of child failed");
|
|
exit(1);
|
|
break;
|
|
case -1:
|
|
dbg("fork of child failed");
|
|
break;
|
|
default:
|
|
wait(NULL);
|
|
}
|
|
}
|
|
|
|
/* 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] = '\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 main(int argc, char *argv[], char *envp[])
|
|
{
|
|
init_logging("udevstart");
|
|
|
|
udev_scan_class();
|
|
udev_scan_block();
|
|
|
|
return 0;
|
|
}
|