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/*
* libudev - interface to udev device information
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
*
* 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, either version 2 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
struct udev_enumerate {
struct udev *udev;
int refcount;
struct list_head devices_list;
};
struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return NULL;
udev_enumerate->refcount++;
return udev_enumerate;
}
void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return;
udev_enumerate->refcount--;
if (udev_enumerate->refcount > 0)
return;
list_cleanup(udev_enumerate->udev, &udev_enumerate->devices_list);
free(udev_enumerate);
}
struct udev_list *udev_enumerate_get_list(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return NULL;
return list_get_entry(&udev_enumerate->devices_list);
}
static int devices_scan_subsystem(struct udev *udev,
const char *basedir, const char *subsystem, const char *subdir,
struct list_head *device_list)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
util_strlcat(path, basedir, sizeof(path));
util_strlcat(path, "/", sizeof(path));
util_strlcat(path, subsystem, sizeof(path));
if (subdir != NULL)
util_strlcat(path, subdir, sizeof(path));
dir = opendir(path);
if (dir == NULL)
return -1;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char syspath[UTIL_PATH_SIZE];
if (dent->d_name[0] == '.')
continue;
util_strlcpy(syspath, path, sizeof(syspath));
util_strlcat(syspath, "/", sizeof(syspath));
util_strlcat(syspath, dent->d_name, sizeof(syspath));
util_resolve_sys_link(udev, syspath, sizeof(syspath));
list_insert(udev, device_list, syspath, NULL, 1);
}
closedir(dir);
return 0;
}
static int devices_scan_subsystems(struct udev *udev,
const char *basedir, const char *subsystem, const char *subdir,
struct list_head *device_list)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
if (subsystem != NULL)
return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list);
util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
util_strlcat(path, basedir, sizeof(path));
dir = opendir(path);
if (dir == NULL)
return -1;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
if (dent->d_name[0] == '.')
continue;
devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list);
}
closedir(dir);
return 0;
}
static int devices_delay(struct udev *udev, const char *syspath)
{
static const char *delay_device_list[] = {
"/block/md",
"/block/dm-",
NULL
};
size_t len;
int i;
len = strlen(udev_get_sys_path(udev));
for (i = 0; delay_device_list[i] != NULL; i++) {
if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
info(udev, "delaying: %s\n", syspath);
return 1;
}
}
return 0;
}
/**
* udev_enumerate_new_from_subsystems:
* @udev: udev library context
* @subsystem: the subsystem to enumerate
*
* Returns: an enumeration context
**/
struct udev_enumerate *udev_enumerate_new_from_subsystems(struct udev *udev, const char *subsystem)
{
struct udev_enumerate *udev_enumerate;
char base[UTIL_PATH_SIZE];
struct stat statbuf;
struct udev_list *list;
if (udev == NULL)
return NULL;
udev_enumerate = malloc(sizeof(struct udev_enumerate));
if (udev_enumerate == NULL)
return NULL;
memset(udev_enumerate, 0x00, (sizeof(struct udev_enumerate)));
udev_enumerate->refcount = 1;
udev_enumerate->udev = udev;
INIT_LIST_HEAD(&udev_enumerate->devices_list);
/* if we have /sys/subsystem/, forget all the old stuff */
util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
util_strlcat(base, "/subsystem", sizeof(base));
if (stat(base, &statbuf) == 0) {
devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &udev_enumerate->devices_list);
} else {
devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &udev_enumerate->devices_list);
devices_scan_subsystems(udev, "/class", subsystem, NULL, &udev_enumerate->devices_list);
}
/* sort delayed devices to the end of the list */
list = list_get_entry(&udev_enumerate->devices_list);
while (list != NULL) {
if (devices_delay(udev, udev_list_get_name(list)))
list_move_to_end(list, &udev_enumerate->devices_list);
list = udev_list_get_next(list);
}
return udev_enumerate;
}
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