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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 <string.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/wait.h>
#include "logging.h"
#ifdef LOG
unsigned char logname[42];
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"
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 };
snprintf(devpath, MAX_PATHLEN, "DEVPATH=%s", path);
devpath[MAX_PATHLEN-1] = '\0';
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);
}
}
static int udev_scan(void)
{
char *devpath;
DIR *dir;
struct dirent *dent;
int retval = -EINVAL;
devpath = "block";
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';
udev_exec(dirname, "block");
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';
udev_exec(filename, "block");
}
}
}
}
}
}
}
devpath = "class";
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';
udev_exec(filename, dent->d_name);
}
}
}
}
}
}
}
if (retval > 0)
retval = 0;
return -retval;
}
int main(int argc, char **argv, char **envp)
{
init_logging("udevstart");
return udev_scan();
}
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