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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"
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));
util_name_list_add(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_devices:
* @udev: udev library context
* @subsystem: the subsystem to enumerate
* @cb: function to be called for every device found
* @data: data to be passed to the function
*
* Returns: the number of devices passed to the caller, or a negative value on error
**/
int udev_enumerate_devices(struct udev *udev, const char *subsystem,
int (*cb)(struct udev_device *udev_device, void *data),
void *data)
{
char base[UTIL_PATH_SIZE];
struct stat statbuf;
struct list_head device_list;
struct util_name_entry *loop_device;
struct util_name_entry *tmp_device;
int cb_rc = 0;
int count = 0;
INIT_LIST_HEAD(&device_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", &device_list);
} else {
devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &device_list);
devices_scan_subsystems(udev, "/class", subsystem, NULL, &device_list);
}
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
if (devices_delay(udev, loop_device->name))
continue;
if (cb_rc == 0) {
struct udev_device *device;
device = udev_device_new_from_syspath(udev, loop_device->name);
if (device != NULL) {
cb_rc = cb(device, data);
count++;
udev_device_unref(device);
}
}
list_del(&loop_device->node);
free(loop_device->name);
free(loop_device);
}
/* handle remaining delayed devices */
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
if (cb_rc == 0) {
struct udev_device *device;
device = udev_device_new_from_syspath(udev, loop_device->name);
if (device != NULL) {
cb_rc = cb(device, data);
count++;
udev_device_unref(device);
}
}
list_del(&loop_device->node);
free(loop_device->name);
free(loop_device);
}
return count;
}
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