libudev-queue.c revision a5d8cffad9020247c9ba81a9e0a9b9cee5c4a4d5
/*
* 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 <fcntl.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
struct udev_queue {
struct udev *udev;
int refcount;
unsigned long long int last_seen_udev_seqnum;
struct udev_list_node queue_list;
struct udev_list_node failed_list;
};
struct udev_queue *udev_queue_new(struct udev *udev)
{
struct udev_queue *udev_queue;
if (udev == NULL)
return NULL;
udev_queue = calloc(1, sizeof(struct udev_queue));
if (udev_queue == NULL)
return NULL;
udev_queue->refcount = 1;
udev_queue->udev = udev;
udev_list_init(&udev_queue->queue_list);
udev_list_init(&udev_queue->failed_list);
return udev_queue;
}
struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return NULL;
udev_queue->refcount++;
return udev_queue;
}
void udev_queue_unref(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return;
udev_queue->refcount--;
if (udev_queue->refcount > 0)
return;
udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
free(udev_queue);
}
struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return NULL;
return udev_queue->udev;
}
unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
{
char filename[UTIL_PATH_SIZE];
unsigned long long int seqnum;
int fd;
char buf[32];
ssize_t len;
if (udev_queue == NULL)
return -EINVAL;
util_strlcpy(filename, udev_get_sys_path(udev_queue->udev), sizeof(filename));
util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
fd = open(filename, O_RDONLY);
if (fd < 0)
return 0;
len = read(fd, buf, sizeof(buf));
close(fd);
if (len <= 2)
return 0;
buf[len-1] = '\0';
seqnum = strtoull(buf, NULL, 10);
dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
return seqnum;
}
unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
{
char filename[UTIL_PATH_SIZE];
unsigned long long int seqnum;
int fd;
char buf[32];
ssize_t len;
if (udev_queue == NULL)
return -EINVAL;
util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
fd = open(filename, O_RDONLY);
if (fd < 0)
return 0;
len = read(fd, buf, sizeof(buf));
close(fd);
if (len <= 2)
return 0;
buf[len-1] = '\0';
seqnum = strtoull(buf, NULL, 10);
dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
udev_queue->last_seen_udev_seqnum = seqnum;
return seqnum;
}
int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
{
char filename[UTIL_PATH_SIZE];
struct stat statbuf;
if (udev_queue == NULL)
return 0;
util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
if (stat(filename, &statbuf) == 0)
return 1;
return 0;
}
int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
{
char queuename[UTIL_PATH_SIZE];
struct stat statbuf;
unsigned long long int seqnum_kernel;
if (udev_queue == NULL)
return -EINVAL;
util_strlcpy(queuename, udev_get_dev_path(udev_queue->udev), sizeof(queuename));
util_strlcat(queuename, "/.udev/queue", sizeof(queuename));
if (stat(queuename, &statbuf) == 0) {
dbg(udev_queue->udev, "queue is not empty\n");
return 0;
}
seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
dbg(udev_queue->udev, "queue is empty\n");
return 1;
}
/* update udev seqnum, and check if udev is still running */
if (udev_queue_get_udev_seqnum(udev_queue) == 0)
if (!udev_queue_get_udev_is_active(udev_queue))
return 1;
if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
dbg(udev_queue->udev, "queue is empty\n");
return 1;
}
dbg(udev_queue->udev, "queue is empty, but kernel events still pending [%llu]<->[%llu]\n",
seqnum_kernel, udev_queue->last_seen_udev_seqnum);
return 0;
}
int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
{
char filename[UTIL_PATH_SIZE];
struct stat statbuf;
if (udev_queue == NULL)
return -EINVAL;
/* if we have not seen this seqnum, check if it is/was already queued */
if (seqnum < udev_queue->last_seen_udev_seqnum) {
udev_queue_get_udev_seqnum(udev_queue);
if (seqnum < udev_queue->last_seen_udev_seqnum)
return 0;
}
snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
udev_get_dev_path(udev_queue->udev), seqnum);
if (lstat(filename, &statbuf) == 0)
return 0;
dbg(udev_queue->udev, "seqnum: %llu finished\n", seqnum);
return 1;
}
struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
if (udev_queue == NULL)
return NULL;
udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
util_strlcat(path, "/.udev/queue", sizeof(path));
dir = opendir(path);
if (dir == NULL)
return NULL;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char filename[UTIL_PATH_SIZE];
char syspath[UTIL_PATH_SIZE];
size_t syslen;
ssize_t len;
if (dent->d_name[0] == '.')
continue;
util_strlcpy(filename, path, sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, dent->d_name, sizeof(filename));
syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
continue;
syspath[syslen + len] = '\0';
dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
udev_list_entry_add(udev_queue->udev, &udev_queue->queue_list, syspath, dent->d_name, 0, 0);
}
closedir(dir);
return udev_list_get_entry(&udev_queue->queue_list);
}
struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
if (udev_queue == NULL)
return NULL;
udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
util_strlcat(path, "/.udev/failed", sizeof(path));
dir = opendir(path);
if (dir == NULL)
return NULL;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char filename[UTIL_PATH_SIZE];
char syspath[UTIL_PATH_SIZE];
struct stat statbuf;
size_t syslen;
ssize_t len;
if (dent->d_name[0] == '.')
continue;
util_strlcpy(filename, path, sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, dent->d_name, sizeof(filename));
syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
continue;
syspath[syslen + len] = '\0';
dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
util_strlcpy(filename, syspath, sizeof(filename));
util_strlcat(filename, "/uevent", sizeof(filename));
if (stat(filename, &statbuf) != 0)
continue;
udev_list_entry_add(udev_queue->udev, &udev_queue->failed_list, syspath, NULL, 0, 0);
}
closedir(dir);
return udev_list_get_entry(&udev_queue->failed_list);
}
int udev_queue_export_udev_seqnum(struct udev_queue *udev_queue, unsigned long long int seqnum)
{
return -1;
}
extern int udev_queue_export_device_queued(struct udev_queue *udev_queue, struct udev_device *udev_device)
{
return -1;
}
extern int udev_queue_export_device_finished(struct udev_queue *udev_queue, struct udev_device *udev_device)
{
return -1;
}
extern int udev_queue_export_device_failed(struct udev_queue *udev_queue, struct udev_device *udev_device)
{
return -1;
}