]>
git.ipfire.org Git - thirdparty/systemd.git/blob - src/libudev/libudev-device-private.c
2 * libudev - interface to udev device information
4 * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
23 #include "libudev-private.h"
25 static void udev_device_tag(struct udev_device
*dev
, const char *tag
, bool add
)
28 char filename
[UTIL_PATH_SIZE
];
30 id
= udev_device_get_id_filename(dev
);
33 util_strscpyl(filename
, sizeof(filename
), "/run/udev/tags/", tag
, "/", id
, NULL
);
38 mkdir_parents(filename
, 0755);
39 fd
= open(filename
, O_WRONLY
|O_CREAT
|O_CLOEXEC
|O_TRUNC
|O_NOFOLLOW
, 0444);
47 int udev_device_tag_index(struct udev_device
*dev
, struct udev_device
*dev_old
, bool add
)
49 struct udev_list_entry
*list_entry
;
52 if (add
&& dev_old
!= NULL
) {
53 /* delete possible left-over tags */
54 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(dev_old
)) {
55 const char *tag_old
= udev_list_entry_get_name(list_entry
);
56 struct udev_list_entry
*list_entry_current
;
59 udev_list_entry_foreach(list_entry_current
, udev_device_get_tags_list_entry(dev
)) {
60 const char *tag
= udev_list_entry_get_name(list_entry_current
);
62 if (streq(tag
, tag_old
)) {
68 udev_device_tag(dev_old
, tag_old
, false);
72 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(dev
))
73 udev_device_tag(dev
, udev_list_entry_get_name(list_entry
), add
);
78 static bool device_has_info(struct udev_device
*udev_device
)
80 struct udev_list_entry
*list_entry
;
82 if (udev_device_get_devlinks_list_entry(udev_device
) != NULL
)
84 if (udev_device_get_devlink_priority(udev_device
) != 0)
86 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(udev_device
))
87 if (udev_list_entry_get_num(list_entry
))
89 if (udev_device_get_tags_list_entry(udev_device
) != NULL
)
91 if (udev_device_get_watch_handle(udev_device
) >= 0)
96 int udev_device_update_db(struct udev_device
*udev_device
)
98 struct udev
*udev
= udev_device_get_udev(udev_device
);
101 char filename
[UTIL_PATH_SIZE
];
102 char filename_tmp
[UTIL_PATH_SIZE
];
105 id
= udev_device_get_id_filename(udev_device
);
109 has_info
= device_has_info(udev_device
);
110 util_strscpyl(filename
, sizeof(filename
), "/run/udev/data/", id
, NULL
);
112 /* do not store anything for otherwise empty devices */
114 major(udev_device_get_devnum(udev_device
)) == 0 &&
115 udev_device_get_ifindex(udev_device
) == 0) {
120 /* write a database file */
121 util_strscpyl(filename_tmp
, sizeof(filename_tmp
), filename
, ".tmp", NULL
);
122 mkdir_parents(filename_tmp
, 0755);
123 f
= fopen(filename_tmp
, "we");
125 udev_err(udev
, "unable to create temporary db file '%s': %m\n", filename_tmp
);
130 * set 'sticky' bit to indicate that we should not clean the
131 * database when we transition from initramfs to the real root
133 if (udev_device_get_db_persist(udev_device
))
134 fchmod(fileno(f
), 01644);
137 struct udev_list_entry
*list_entry
;
139 if (major(udev_device_get_devnum(udev_device
)) > 0) {
140 udev_list_entry_foreach(list_entry
, udev_device_get_devlinks_list_entry(udev_device
))
141 fprintf(f
, "S:%s\n", udev_list_entry_get_name(list_entry
) + strlen("/dev/"));
142 if (udev_device_get_devlink_priority(udev_device
) != 0)
143 fprintf(f
, "L:%i\n", udev_device_get_devlink_priority(udev_device
));
144 if (udev_device_get_watch_handle(udev_device
) >= 0)
145 fprintf(f
, "W:%i\n", udev_device_get_watch_handle(udev_device
));
148 if (udev_device_get_usec_initialized(udev_device
) > 0)
149 fprintf(f
, "I:%llu\n", udev_device_get_usec_initialized(udev_device
));
151 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(udev_device
)) {
152 if (!udev_list_entry_get_num(list_entry
))
154 fprintf(f
, "E:%s=%s\n",
155 udev_list_entry_get_name(list_entry
),
156 udev_list_entry_get_value(list_entry
));
159 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(udev_device
))
160 fprintf(f
, "G:%s\n", udev_list_entry_get_name(list_entry
));
164 rename(filename_tmp
, filename
);
165 udev_dbg(udev
, "created %s file '%s' for '%s'\n", has_info
? "db" : "empty",
166 filename
, udev_device_get_devpath(udev_device
));
170 int udev_device_delete_db(struct udev_device
*udev_device
)
173 char filename
[UTIL_PATH_SIZE
];
175 id
= udev_device_get_id_filename(udev_device
);
178 util_strscpyl(filename
, sizeof(filename
), "/run/udev/data/", id
, NULL
);