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/*
* udev.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.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 <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "udev.h"
#include "udev_version.h"
#include "namedev.h"
#include "udevdb.h"
#include "libsysfs/libsysfs.h"
/* global variables */
char **main_argv;
char **main_envp;
char sysfs_path[SYSFS_PATH_MAX];
char *udev_config_dir = UDEV_CONFIG_DIR;
char *udev_root = UDEV_ROOT;
char udev_db_filename[PATH_MAX+NAME_MAX];
char udev_config_permission_filename[PATH_MAX+NAME_MAX];
char udev_config_filename[PATH_MAX+NAME_MAX];
static inline char *get_action(void)
{
char *action;
action = getenv("ACTION");
return action;
}
static inline char *get_devpath(void)
{
char *devpath;
devpath = getenv("DEVPATH");
return devpath;
}
static inline char *get_seqnum(void)
{
char *seqnum;
seqnum = getenv("SEQNUM");
return seqnum;
}
static void get_dirs(void)
{
char *temp;
char *udev_db = UDEV_DB;
char *udev_config = UDEV_CONFIG_FILE;
char *udev_permission = UDEV_CONFIG_PERMISSION_FILE;
int retval;
retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
if (retval)
dbg("sysfs_get_mnt_path failed");
/* see if we should try to override any of the default values */
temp = getenv("UDEV_TEST");
if (temp != NULL) {
/* hm testing is happening, use the specified values, if they are present */
temp = getenv("SYSFS_PATH");
if (temp)
strncpy(sysfs_path, temp, sizeof(sysfs_path));
temp = getenv("UDEV_CONFIG_DIR");
if (temp)
udev_config_dir = temp;
temp = getenv("UDEV_ROOT");
if (temp)
udev_root = temp;
temp = getenv("UDEV_DB");
if (temp)
udev_db = temp;
temp = getenv("UDEV_CONFIG_FILE");
if (temp)
udev_config = temp;
temp = getenv("UDEV_PERMISSION_FILE");
if (temp)
udev_permission = temp;
}
dbg("sysfs_path = %s", sysfs_path);
strncpy(udev_db_filename, udev_config_dir, sizeof(udev_db_filename));
strncat(udev_db_filename, udev_db, sizeof(udev_db_filename));
strncpy(udev_config_filename, udev_config_dir, sizeof(udev_config_filename));
strncat(udev_config_filename, udev_config, sizeof(udev_config_filename));
strncpy(udev_config_permission_filename, udev_config_dir, sizeof(udev_config_permission_filename));
strncat(udev_config_permission_filename, udev_permission, sizeof(udev_config_permission_filename));
}
int main(int argc, char **argv, char **envp)
{
char *action;
char *devpath;
char *subsystem;
int retval = -EINVAL;
main_argv = argv;
main_envp = envp;
dbg("version %s", UDEV_VERSION);
if (argc != 2) {
dbg ("unknown number of arguments");
goto exit;
}
subsystem = argv[1];
devpath = get_devpath();
if (!devpath) {
dbg ("no devpath?");
goto exit;
}
dbg("looking at %s", devpath);
/* we only care about class devices and block stuff */
if (!strstr(devpath, "class") &&
!strstr(devpath, "block")) {
dbg("not block or class");
goto exit;
}
/* but we don't care about net class devices */
if (strcmp(subsystem, "net") == 0) {
dbg("don't care about net devices");
goto exit;
}
action = get_action();
if (!action) {
dbg ("no action?");
goto exit;
}
/* initialize udev database */
get_dirs();
retval = udevdb_init(UDEVDB_DEFAULT);
if (retval != 0) {
dbg("Unable to initialize database.");
goto exit;
}
/* initialize the naming deamon */
namedev_init();
if (strcmp(action, "add") == 0)
retval = udev_add_device(devpath, subsystem);
else if (strcmp(action, "remove") == 0)
retval = udev_remove_device(devpath, subsystem);
else {
dbg("Unknown action: %s", action);
retval = -EINVAL;
}
udevdb_exit();
exit:
return retval;
}
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