diff options
Diffstat (limited to 'src/libudev/libudev-device-private.c')
| -rw-r--r-- | src/libudev/libudev-device-private.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/libudev/libudev-device-private.c b/src/libudev/libudev-device-private.c new file mode 100644 index 0000000000..c123057907 --- /dev/null +++ b/src/libudev/libudev-device-private.c @@ -0,0 +1,192 @@ +/*** + This file is part of systemd. + + Copyright 2008-2012 Kay Sievers <kay@vrfy.org> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <stddef.h> +#include <stdbool.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <sys/stat.h> + +#include "libudev.h" +#include "libudev-private.h" + +static void udev_device_tag(struct udev_device *dev, const char *tag, bool add) +{ + const char *id; + char filename[UTIL_PATH_SIZE]; + + id = udev_device_get_id_filename(dev); + if (id == NULL) + return; + util_strscpyl(filename, sizeof(filename), "/run/udev/tags/", tag, "/", id, NULL); + + if (add) { + int fd; + + mkdir_parents(filename, 0755); + fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444); + if (fd >= 0) + close(fd); + } else { + unlink(filename); + } +} + +int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add) +{ + struct udev_list_entry *list_entry; + bool found; + + if (add && dev_old != NULL) { + /* delete possible left-over tags */ + udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) { + const char *tag_old = udev_list_entry_get_name(list_entry); + struct udev_list_entry *list_entry_current; + + found = false; + udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) { + const char *tag = udev_list_entry_get_name(list_entry_current); + + if (streq(tag, tag_old)) { + found = true; + break; + } + } + if (!found) + udev_device_tag(dev_old, tag_old, false); + } + } + + udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev)) + udev_device_tag(dev, udev_list_entry_get_name(list_entry), add); + + return 0; +} + +static bool device_has_info(struct udev_device *udev_device) +{ + struct udev_list_entry *list_entry; + + if (udev_device_get_devlinks_list_entry(udev_device) != NULL) + return true; + if (udev_device_get_devlink_priority(udev_device) != 0) + return true; + udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) + if (udev_list_entry_get_num(list_entry)) + return true; + if (udev_device_get_tags_list_entry(udev_device) != NULL) + return true; + if (udev_device_get_watch_handle(udev_device) >= 0) + return true; + return false; +} + +int udev_device_update_db(struct udev_device *udev_device) +{ + struct udev *udev = udev_device_get_udev(udev_device); + bool has_info; + const char *id; + char filename[UTIL_PATH_SIZE]; + char filename_tmp[UTIL_PATH_SIZE]; + FILE *f; + int r; + + id = udev_device_get_id_filename(udev_device); + if (id == NULL) + return -1; + + has_info = device_has_info(udev_device); + util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); + + /* do not store anything for otherwise empty devices */ + if (!has_info && + major(udev_device_get_devnum(udev_device)) == 0 && + udev_device_get_ifindex(udev_device) == 0) { + unlink(filename); + return 0; + } + + /* write a database file */ + util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL); + mkdir_parents(filename_tmp, 0755); + f = fopen(filename_tmp, "we"); + if (f == NULL) { + udev_err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp); + return -1; + } + + /* + * set 'sticky' bit to indicate that we should not clean the + * database when we transition from initramfs to the real root + */ + if (udev_device_get_db_persist(udev_device)) + fchmod(fileno(f), 01644); + + if (has_info) { + struct udev_list_entry *list_entry; + + if (major(udev_device_get_devnum(udev_device)) > 0) { + udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) + fprintf(f, "S:%s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/")); + if (udev_device_get_devlink_priority(udev_device) != 0) + fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device)); + if (udev_device_get_watch_handle(udev_device) >= 0) + fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device)); + } + + if (udev_device_get_usec_initialized(udev_device) > 0) + fprintf(f, "I:%llu\n", (unsigned long long)udev_device_get_usec_initialized(udev_device)); + + udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { + if (!udev_list_entry_get_num(list_entry)) + continue; + fprintf(f, "E:%s=%s\n", + udev_list_entry_get_name(list_entry), + udev_list_entry_get_value(list_entry)); + } + + udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) + fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry)); + } + + fclose(f); + r = rename(filename_tmp, filename); + if (r < 0) + return -1; + udev_dbg(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty", + filename, udev_device_get_devpath(udev_device)); + return 0; +} + +int udev_device_delete_db(struct udev_device *udev_device) +{ + const char *id; + char filename[UTIL_PATH_SIZE]; + + id = udev_device_get_id_filename(udev_device); + if (id == NULL) + return -1; + util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); + unlink(filename); + return 0; +} |