/* * 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 = malloc(sizeof(struct udev_queue)); if (udev_queue == NULL) return NULL; memset(udev_queue, 0x00, sizeof(struct udev_queue)); 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(udev_queue->udev, &udev_queue->queue_list); udev_list_cleanup(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); info(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); info(udev_queue->udev, "seqnum=%llu\n", seqnum); udev_queue->last_seen_udev_seqnum = seqnum; return seqnum; } 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) { info(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) { info(udev_queue->udev, "queue is empty\n"); return 1; } udev_queue_get_udev_seqnum(udev_queue); if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) { info(udev_queue->udev, "queue is empty\n"); return 1; } info(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 (stat(filename, &statbuf) == 0) return 0; info(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(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'; info(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(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'; info(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; }