mirror of
https://github.com/systemd/systemd
synced 2024-09-06 16:56:43 +00:00
libudev: enumerate - add udev_enumerate_add_match_parent()
This commit is contained in:
parent
b59c22a758
commit
b05211fa3e
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@ -94,6 +94,7 @@ udev_enumerate_add_match_sysattr
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udev_enumerate_add_nomatch_sysattr
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udev_enumerate_add_match_property
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udev_enumerate_add_match_tag
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udev_enumerate_add_match_parent
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udev_enumerate_add_match_is_initialized
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udev_enumerate_add_match_sysname
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udev_enumerate_add_syspath
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@ -52,6 +52,7 @@ struct udev_enumerate {
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struct udev_list_node sysname_match_list;
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struct udev_list_node properties_match_list;
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struct udev_list_node tags_match_list;
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struct udev_device *parent_match;
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struct udev_list_node devices_list;
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struct syspath *devices;
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unsigned int devices_cur;
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@ -125,6 +126,7 @@ UDEV_EXPORT void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
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udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysname_match_list);
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udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->properties_match_list);
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udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->tags_match_list);
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udev_device_unref(udev_enumerate->parent_match);
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udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->devices_list);
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for (i = 0; i < udev_enumerate->devices_cur; i++)
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free(udev_enumerate->devices[i].syspath);
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@ -459,6 +461,30 @@ UDEV_EXPORT int udev_enumerate_add_match_tag(struct udev_enumerate *udev_enumera
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return 0;
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}
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/**
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* udev_enumerate_add_match_parent:
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* @udev_enumerate: context
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* @parent: filter for the parent device
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*
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* Return only the children of a given device.
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*
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* A reference for the device is held until the udev_enumerate context
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* is cleaned up.
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*
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* Returns: 0 on success, otherwise a negative error value.
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*/
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UDEV_EXPORT int udev_enumerate_add_match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *parent)
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{
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if (udev_enumerate == NULL)
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return -EINVAL;
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if (parent == NULL)
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return 0;
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if (udev_enumerate->parent_match != NULL)
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udev_device_unref(udev_enumerate->parent_match);
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udev_enumerate->parent_match = udev_device_ref(parent);
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return 0;
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}
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/**
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* udev_enumerate_add_match_is_initialized:
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* @udev_enumerate: context
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@ -581,6 +607,17 @@ static bool match_tag(struct udev_enumerate *udev_enumerate, struct udev_device
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return true;
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}
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static bool match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *dev)
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{
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const char *parent;
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if (udev_enumerate->parent_match == NULL)
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return true;
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parent = udev_device_get_devpath(udev_enumerate->parent_match);
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return strncmp(parent, udev_device_get_devpath(dev), strlen(parent)) == 0;
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}
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static bool match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname)
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{
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struct udev_list_entry *list_entry;
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@ -645,6 +682,8 @@ static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
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(major(udev_device_get_devnum(dev)) > 0 || udev_device_get_ifindex(dev) > 0))
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goto nomatch;
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}
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if (!match_parent(udev_enumerate, dev))
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goto nomatch;
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if (!match_tag(udev_enumerate, dev))
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goto nomatch;
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if (!match_property(udev_enumerate, dev))
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@ -727,6 +766,122 @@ UDEV_EXPORT int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate
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return 0;
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}
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static int scan_devices_tags(struct udev_enumerate *udev_enumerate)
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{
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struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
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struct udev_list_entry *list_entry;
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/* scan only tagged devices, use tags reverse-index, instead of searching all devices in /sys */
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udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->tags_match_list)) {
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DIR *dir;
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struct dirent *dent;
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char path[UTIL_PATH_SIZE];
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util_strscpyl(path, sizeof(path), udev_get_run_path(udev), "/tags/",
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udev_list_entry_get_name(list_entry), NULL);
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dir = opendir(path);
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if (dir == NULL)
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continue;
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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struct udev_device *dev;
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if (dent->d_name[0] == '.')
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continue;
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dev = udev_device_new_from_id_filename(udev_enumerate->udev, dent->d_name);
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if (dev == NULL)
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continue;
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if (!match_subsystem(udev_enumerate, udev_device_get_subsystem(dev)))
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goto nomatch;
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if (!match_sysname(udev_enumerate, udev_device_get_sysname(dev)))
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goto nomatch;
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if (!match_parent(udev_enumerate, dev))
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goto nomatch;
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if (!match_property(udev_enumerate, dev))
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goto nomatch;
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if (!match_sysattr(udev_enumerate, dev))
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goto nomatch;
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syspath_add(udev_enumerate, udev_device_get_syspath(dev));
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nomatch:
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udev_device_unref(dev);
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}
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closedir(dir);
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}
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return 0;
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}
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static int parent_add_child(struct udev_enumerate *enumerate, const char *path)
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{
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struct udev_device *dev;
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dev = udev_device_new_from_syspath(enumerate->udev, path);
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if (dev == NULL)
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return -ENODEV;
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if (!match_subsystem(enumerate, udev_device_get_subsystem(dev)))
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return 0;
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if (!match_sysname(enumerate, udev_device_get_sysname(dev)))
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return 0;
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if (!match_property(enumerate, dev))
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return 0;
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if (!match_sysattr(enumerate, dev))
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return 0;
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syspath_add(enumerate, udev_device_get_syspath(dev));
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udev_device_unref(dev);
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return 1;
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}
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static int parent_crawl_children(struct udev_enumerate *enumerate, const char *path, int maxdepth)
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{
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DIR *d;
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struct dirent *dent;
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d = opendir(path);
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if (d == NULL)
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return -errno;
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for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
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char *child;
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if (dent->d_name[0] == '.')
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continue;
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if (dent->d_type != DT_DIR)
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continue;
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if (asprintf(&child, "%s/%s", path, dent->d_name) < 0)
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continue;
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parent_add_child(enumerate, child);
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if (maxdepth > 0)
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parent_crawl_children(enumerate, child, maxdepth-1);
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free(child);
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}
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closedir(d);
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return 0;
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}
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static int scan_devices_all(struct udev_enumerate *udev_enumerate)
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{
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struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
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char base[UTIL_PATH_SIZE];
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struct stat statbuf;
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util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
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if (stat(base, &statbuf) == 0) {
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/* we have /subsystem/, forget all the old stuff */
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dbg(udev, "searching '/subsystem/*/devices/*' dir\n");
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scan_dir(udev_enumerate, "subsystem", "devices", NULL);
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} else {
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dbg(udev, "searching '/bus/*/devices/*' dir\n");
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scan_dir(udev_enumerate, "bus", "devices", NULL);
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dbg(udev, "searching '/class/*' dir\n");
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scan_dir(udev_enumerate, "class", NULL, NULL);
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}
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return 0;
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}
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/**
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* udev_enumerate_scan_devices:
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* @udev_enumerate: udev enumeration context
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@ -735,67 +890,16 @@ UDEV_EXPORT int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate
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**/
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UDEV_EXPORT int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
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{
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struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
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char base[UTIL_PATH_SIZE];
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struct stat statbuf;
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if (udev_enumerate == NULL)
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return -EINVAL;
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if (udev_list_get_entry(&udev_enumerate->tags_match_list) != NULL) {
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struct udev_list_entry *list_entry;
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if (udev_list_get_entry(&udev_enumerate->tags_match_list) != NULL)
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return scan_devices_tags(udev_enumerate);
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/* scan only tagged devices, use tags reverse-index, instead of searching all devices in /sys */
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udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->tags_match_list)) {
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DIR *dir;
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struct dirent *dent;
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char path[UTIL_PATH_SIZE];
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if (udev_enumerate->parent_match != NULL)
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return parent_crawl_children(udev_enumerate, udev_device_get_syspath(udev_enumerate->parent_match), 256);
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util_strscpyl(path, sizeof(path), udev_get_run_path(udev), "/tags/",
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udev_list_entry_get_name(list_entry), NULL);
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dir = opendir(path);
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if (dir == NULL)
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continue;
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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struct udev_device *dev;
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if (dent->d_name[0] == '.')
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continue;
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dev = udev_device_new_from_id_filename(udev_enumerate->udev, dent->d_name);
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if (dev == NULL)
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continue;
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if (!match_subsystem(udev_enumerate, udev_device_get_subsystem(dev)))
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goto nomatch;
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if (!match_sysname(udev_enumerate, udev_device_get_sysname(dev)))
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goto nomatch;
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if (!match_property(udev_enumerate, dev))
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goto nomatch;
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if (!match_sysattr(udev_enumerate, dev))
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goto nomatch;
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syspath_add(udev_enumerate, udev_device_get_syspath(dev));
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nomatch:
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udev_device_unref(dev);
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}
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closedir(dir);
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}
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} else {
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util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
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if (stat(base, &statbuf) == 0) {
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/* we have /subsystem/, forget all the old stuff */
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dbg(udev, "searching '/subsystem/*/devices/*' dir\n");
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scan_dir(udev_enumerate, "subsystem", "devices", NULL);
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} else {
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dbg(udev, "searching '/bus/*/devices/*' dir\n");
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scan_dir(udev_enumerate, "bus", "devices", NULL);
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dbg(udev, "searching '/class/*' dir\n");
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scan_dir(udev_enumerate, "class", NULL, NULL);
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}
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}
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return 0;
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return scan_devices_all(udev_enumerate);
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}
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/**
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@ -146,6 +146,7 @@ int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, co
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int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
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int udev_enumerate_add_match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname);
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int udev_enumerate_add_match_tag(struct udev_enumerate *udev_enumerate, const char *tag);
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int udev_enumerate_add_match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *parent);
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int udev_enumerate_add_match_is_initialized(struct udev_enumerate *udev_enumerate);
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int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath);
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/* run enumeration with active filters */
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@ -103,6 +103,7 @@ int udevadm_trigger(struct udev *udev, int argc, char *argv[])
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{ "property-match", required_argument, NULL, 'p' },
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{ "tag-match", required_argument, NULL, 'g' },
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{ "sysname-match", required_argument, NULL, 'y' },
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{ "parent-match", required_argument, NULL, 'b' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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@ -128,7 +129,7 @@ int udevadm_trigger(struct udev *udev, int argc, char *argv[])
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const char *val;
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char buf[UTIL_PATH_SIZE];
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option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:", options, NULL);
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option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:b:", options, NULL);
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if (option == -1)
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break;
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@ -179,6 +180,27 @@ int udevadm_trigger(struct udev *udev, int argc, char *argv[])
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case 'y':
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udev_enumerate_add_match_sysname(udev_enumerate, optarg);
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break;
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case 'b': {
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char path[UTIL_PATH_SIZE];
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struct udev_device *dev;
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/* add sys dir if needed */
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if (strncmp(optarg, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
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util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), optarg, NULL);
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else
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util_strscpy(path, sizeof(path), optarg);
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util_remove_trailing_chars(path, '/');
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dev = udev_device_new_from_syspath(udev, path);
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if (dev == NULL) {
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err(udev, "unable to open the device '%s'\n", optarg);
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rc = 2;
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goto exit;
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}
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udev_enumerate_add_match_parent(udev_enumerate, dev);
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/* drop reference immediately, enumerate pins the device as long as needed */
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udev_device_unref(dev);
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break;
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}
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case 'h':
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printf("Usage: udevadm trigger OPTIONS\n"
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" --verbose print the list of devices while running\n"
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@ -196,6 +218,7 @@ int udevadm_trigger(struct udev *udev, int argc, char *argv[])
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" --property-match=<key>=<value> trigger devices with a matching property\n"
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" --tag-match=<key>=<value> trigger devices with a matching property\n"
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" --sysname-match=<name> trigger devices with a matching name\n"
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" --parent-match=<name> trigger devices with that parent device\n"
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" --help\n\n");
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goto exit;
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default:
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@ -252,6 +252,12 @@
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specified multiple times and supports shell style pattern matching.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--parent-match=<replaceable>syspath</replaceable></option></term>
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<listitem>
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<para>Trigger events for all children of a given device.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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