| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include "sd-device.h" |
| |
| #include "alloc-util.h" |
| #include "device-enumerator-private.h" |
| #include "device-util.h" |
| #include "dirent-util.h" |
| #include "fd-util.h" |
| #include "set.h" |
| #include "sort-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| #define DEVICE_ENUMERATE_MAX_DEPTH 256 |
| |
| typedef enum DeviceEnumerationType { |
| DEVICE_ENUMERATION_TYPE_DEVICES, |
| DEVICE_ENUMERATION_TYPE_SUBSYSTEMS, |
| _DEVICE_ENUMERATION_TYPE_MAX, |
| _DEVICE_ENUMERATION_TYPE_INVALID = -EINVAL, |
| } DeviceEnumerationType; |
| |
| struct sd_device_enumerator { |
| unsigned n_ref; |
| |
| DeviceEnumerationType type; |
| sd_device **devices; |
| size_t n_devices, current_device_index; |
| bool scan_uptodate; |
| |
| Set *match_subsystem; |
| Set *nomatch_subsystem; |
| Hashmap *match_sysattr; |
| Hashmap *nomatch_sysattr; |
| Hashmap *match_property; |
| Set *match_sysname; |
| Set *match_tag; |
| Set *match_parent; |
| bool match_allow_uninitialized; |
| }; |
| |
| _public_ int sd_device_enumerator_new(sd_device_enumerator **ret) { |
| _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *enumerator = NULL; |
| |
| assert(ret); |
| |
| enumerator = new(sd_device_enumerator, 1); |
| if (!enumerator) |
| return -ENOMEM; |
| |
| *enumerator = (sd_device_enumerator) { |
| .n_ref = 1, |
| .type = _DEVICE_ENUMERATION_TYPE_INVALID, |
| }; |
| |
| *ret = TAKE_PTR(enumerator); |
| |
| return 0; |
| } |
| |
| static sd_device_enumerator *device_enumerator_free(sd_device_enumerator *enumerator) { |
| assert(enumerator); |
| |
| for (size_t i = 0; i < enumerator->n_devices; i++) |
| sd_device_unref(enumerator->devices[i]); |
| |
| free(enumerator->devices); |
| set_free(enumerator->match_subsystem); |
| set_free(enumerator->nomatch_subsystem); |
| hashmap_free(enumerator->match_sysattr); |
| hashmap_free(enumerator->nomatch_sysattr); |
| hashmap_free(enumerator->match_property); |
| set_free(enumerator->match_sysname); |
| set_free(enumerator->match_tag); |
| set_free(enumerator->match_parent); |
| |
| return mfree(enumerator); |
| } |
| |
| DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device_enumerator, sd_device_enumerator, device_enumerator_free); |
| |
| _public_ int sd_device_enumerator_add_match_subsystem(sd_device_enumerator *enumerator, const char *subsystem, int match) { |
| Set **set; |
| int r; |
| |
| assert_return(enumerator, -EINVAL); |
| assert_return(subsystem, -EINVAL); |
| |
| if (match) |
| set = &enumerator->match_subsystem; |
| else |
| set = &enumerator->nomatch_subsystem; |
| |
| r = set_put_strdup(set, subsystem); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| _public_ int sd_device_enumerator_add_match_sysattr(sd_device_enumerator *enumerator, const char *sysattr, const char *value, int match) { |
| Hashmap **hashmap; |
| int r; |
| |
| assert_return(enumerator, -EINVAL); |
| assert_return(sysattr, -EINVAL); |
| |
| if (match) |
| hashmap = &enumerator->match_sysattr; |
| else |
| hashmap = &enumerator->nomatch_sysattr; |
| |
| /* Do not use string_has_ops_free_free or hashmap_put_strdup() here, as this may be called |
| * multiple times with the same sysattr but different value. */ |
| r = hashmap_put_strdup_full(hashmap, &trivial_hash_ops_free_free, sysattr, value); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| _public_ int sd_device_enumerator_add_match_property(sd_device_enumerator *enumerator, const char *property, const char *value) { |
| int r; |
| |
| assert_return(enumerator, -EINVAL); |
| assert_return(property, -EINVAL); |
| |
| /* Do not use string_has_ops_free_free or hashmap_put_strdup() here, as this may be called |
| * multiple times with the same property but different value. */ |
| r = hashmap_put_strdup_full(&enumerator->match_property, &trivial_hash_ops_free_free, property, value); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| _public_ int sd_device_enumerator_add_match_sysname(sd_device_enumerator *enumerator, const char *sysname) { |
| int r; |
| |
| assert_return(enumerator, -EINVAL); |
| assert_return(sysname, -EINVAL); |
| |
| r = set_put_strdup(&enumerator->match_sysname, sysname); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| _public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator, const char *tag) { |
| int r; |
| |
| assert_return(enumerator, -EINVAL); |
| assert_return(tag, -EINVAL); |
| |
| r = set_put_strdup(&enumerator->match_tag, tag); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| int device_enumerator_add_match_parent_incremental(sd_device_enumerator *enumerator, sd_device *parent) { |
| const char *path; |
| int r; |
| |
| assert(enumerator); |
| assert(parent); |
| |
| r = sd_device_get_syspath(parent, &path); |
| if (r < 0) |
| return r; |
| |
| r = set_put_strdup(&enumerator->match_parent, path); |
| if (r <= 0) |
| return r; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| _public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) { |
| assert_return(enumerator, -EINVAL); |
| assert_return(parent, -EINVAL); |
| |
| set_clear(enumerator->match_parent); |
| |
| return device_enumerator_add_match_parent_incremental(enumerator, parent); |
| } |
| |
| _public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, -EINVAL); |
| |
| enumerator->match_allow_uninitialized = true; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, -EINVAL); |
| |
| enumerator->match_allow_uninitialized = false; |
| |
| enumerator->scan_uptodate = false; |
| |
| return 1; |
| } |
| |
| static int device_compare(sd_device * const *_a, sd_device * const *_b) { |
| sd_device *a = *(sd_device **)_a, *b = *(sd_device **)_b; |
| const char *devpath_a, *devpath_b, *sound_a; |
| bool delay_a, delay_b; |
| int r; |
| |
| assert_se(sd_device_get_devpath(a, &devpath_a) >= 0); |
| assert_se(sd_device_get_devpath(b, &devpath_b) >= 0); |
| |
| sound_a = strstr(devpath_a, "/sound/card"); |
| if (sound_a) { |
| /* For sound cards the control device must be enumerated last to |
| * make sure it's the final device node that gets ACLs applied. |
| * Applications rely on this fact and use ACL changes on the |
| * control node as an indicator that the ACL change of the |
| * entire sound card completed. The kernel makes this guarantee |
| * when creating those devices, and hence we should too when |
| * enumerating them. */ |
| sound_a += STRLEN("/sound/card"); |
| sound_a = strchr(sound_a, '/'); |
| |
| if (sound_a) { |
| unsigned prefix_len; |
| |
| prefix_len = sound_a - devpath_a; |
| |
| if (strncmp(devpath_a, devpath_b, prefix_len) == 0) { |
| const char *sound_b; |
| |
| sound_b = devpath_b + prefix_len; |
| |
| if (startswith(sound_a, "/controlC") && |
| !startswith(sound_b, "/contolC")) |
| return 1; |
| |
| if (!startswith(sound_a, "/controlC") && |
| startswith(sound_b, "/controlC")) |
| return -1; |
| } |
| } |
| } |
| |
| /* md and dm devices are enumerated after all other devices */ |
| delay_a = strstr(devpath_a, "/block/md") || strstr(devpath_a, "/block/dm-"); |
| delay_b = strstr(devpath_b, "/block/md") || strstr(devpath_b, "/block/dm-"); |
| r = CMP(delay_a, delay_b); |
| if (r != 0) |
| return r; |
| |
| return strcmp(devpath_a, devpath_b); |
| } |
| |
| int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device) { |
| assert_return(enumerator, -EINVAL); |
| assert_return(device, -EINVAL); |
| |
| if (!GREEDY_REALLOC(enumerator->devices, enumerator->n_devices + 1)) |
| return -ENOMEM; |
| |
| enumerator->devices[enumerator->n_devices++] = sd_device_ref(device); |
| |
| return 0; |
| } |
| |
| static bool match_property(sd_device_enumerator *enumerator, sd_device *device) { |
| const char *property; |
| const char *value; |
| |
| assert(enumerator); |
| assert(device); |
| |
| if (hashmap_isempty(enumerator->match_property)) |
| return true; |
| |
| HASHMAP_FOREACH_KEY(value, property, enumerator->match_property) { |
| const char *property_dev, *value_dev; |
| |
| FOREACH_DEVICE_PROPERTY(device, property_dev, value_dev) { |
| if (fnmatch(property, property_dev, 0) != 0) |
| continue; |
| |
| if (!value && !value_dev) |
| return true; |
| |
| if (!value || !value_dev) |
| continue; |
| |
| if (fnmatch(value, value_dev, 0) == 0) |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) { |
| const char *tag; |
| |
| assert(enumerator); |
| assert(device); |
| |
| SET_FOREACH(tag, enumerator->match_tag) |
| if (!sd_device_has_tag(device, tag)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) { |
| const char *sysname_match; |
| |
| assert(enumerator); |
| assert(sysname); |
| |
| if (set_isempty(enumerator->match_sysname)) |
| return true; |
| |
| SET_FOREACH(sysname_match, enumerator->match_sysname) |
| if (fnmatch(sysname_match, sysname, 0) == 0) |
| return true; |
| |
| return false; |
| } |
| |
| static int enumerator_scan_dir_and_add_devices(sd_device_enumerator *enumerator, const char *basedir, const char *subdir1, const char *subdir2) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| char *path; |
| struct dirent *dent; |
| int r = 0; |
| |
| assert(enumerator); |
| assert(basedir); |
| |
| path = strjoina("/sys/", basedir, "/"); |
| |
| if (subdir1) |
| path = strjoina(path, subdir1, "/"); |
| |
| if (subdir2) |
| path = strjoina(path, subdir2, "/"); |
| |
| dir = opendir(path); |
| if (!dir) |
| /* this is necessarily racey, so ignore missing directories */ |
| return (errno == ENOENT && (subdir1 || subdir2)) ? 0 : -errno; |
| |
| FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
| _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
| char syspath[strlen(path) + 1 + strlen(dent->d_name) + 1]; |
| int initialized, k; |
| |
| if (dent->d_name[0] == '.') |
| continue; |
| |
| if (!match_sysname(enumerator, dent->d_name)) |
| continue; |
| |
| (void) sprintf(syspath, "%s%s", path, dent->d_name); |
| |
| k = sd_device_new_from_syspath(&device, syspath); |
| if (k < 0) { |
| if (k != -ENODEV) |
| /* this is necessarily racey, so ignore missing devices */ |
| r = k; |
| |
| continue; |
| } |
| |
| initialized = sd_device_get_is_initialized(device); |
| if (initialized < 0) { |
| if (initialized != -ENOENT) |
| /* this is necessarily racey, so ignore missing devices */ |
| r = initialized; |
| |
| continue; |
| } |
| |
| /* |
| * All devices with a device node or network interfaces |
| * possibly need udev to adjust the device node permission |
| * or context, or rename the interface before it can be |
| * reliably used from other processes. |
| * |
| * For now, we can only check these types of devices, we |
| * might not store a database, and have no way to find out |
| * for all other types of devices. |
| */ |
| if (!enumerator->match_allow_uninitialized && |
| !initialized && |
| (sd_device_get_devnum(device, NULL) >= 0 || |
| sd_device_get_ifindex(device, NULL) >= 0)) |
| continue; |
| |
| if (!device_match_parent(device, enumerator->match_parent, NULL)) |
| continue; |
| |
| if (!match_tag(enumerator, device)) |
| continue; |
| |
| if (!match_property(enumerator, device)) |
| continue; |
| |
| if (!device_match_sysattr(device, enumerator->match_sysattr, enumerator->nomatch_sysattr)) |
| continue; |
| |
| k = device_enumerator_add_device(enumerator, device); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static bool match_subsystem(sd_device_enumerator *enumerator, const char *subsystem) { |
| const char *subsystem_match; |
| |
| assert(enumerator); |
| |
| if (!subsystem) |
| return false; |
| |
| SET_FOREACH(subsystem_match, enumerator->nomatch_subsystem) |
| if (fnmatch(subsystem_match, subsystem, 0) == 0) |
| return false; |
| |
| if (set_isempty(enumerator->match_subsystem)) |
| return true; |
| |
| SET_FOREACH(subsystem_match, enumerator->match_subsystem) |
| if (fnmatch(subsystem_match, subsystem, 0) == 0) |
| return true; |
| |
| return false; |
| } |
| |
| static int enumerator_scan_dir(sd_device_enumerator *enumerator, const char *basedir, const char *subdir, const char *subsystem) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| char *path; |
| struct dirent *dent; |
| int r = 0; |
| |
| path = strjoina("/sys/", basedir); |
| |
| dir = opendir(path); |
| if (!dir) |
| return -errno; |
| |
| log_debug("sd-device-enumerator: Scanning %s", path); |
| |
| FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
| int k; |
| |
| if (dent->d_name[0] == '.') |
| continue; |
| |
| if (!match_subsystem(enumerator, subsystem ? : dent->d_name)) |
| continue; |
| |
| k = enumerator_scan_dir_and_add_devices(enumerator, basedir, dent->d_name, subdir); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int enumerator_scan_devices_tag(sd_device_enumerator *enumerator, const char *tag) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| char *path; |
| struct dirent *dent; |
| int r = 0; |
| |
| assert(enumerator); |
| assert(tag); |
| |
| path = strjoina("/run/udev/tags/", tag); |
| |
| dir = opendir(path); |
| if (!dir) { |
| if (errno != ENOENT) |
| return log_debug_errno(errno, "sd-device-enumerator: Failed to open tags directory %s: %m", path); |
| return 0; |
| } |
| |
| /* TODO: filter away subsystems? */ |
| |
| FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
| _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
| const char *subsystem, *sysname; |
| int k; |
| |
| if (dent->d_name[0] == '.') |
| continue; |
| |
| k = sd_device_new_from_device_id(&device, dent->d_name); |
| if (k < 0) { |
| if (k != -ENODEV) |
| /* this is necessarily racy, so ignore missing devices */ |
| r = k; |
| |
| continue; |
| } |
| |
| k = sd_device_get_subsystem(device, &subsystem); |
| if (k < 0) { |
| if (k != -ENOENT) |
| /* this is necessarily racy, so ignore missing devices */ |
| r = k; |
| continue; |
| } |
| |
| if (!match_subsystem(enumerator, subsystem)) |
| continue; |
| |
| k = sd_device_get_sysname(device, &sysname); |
| if (k < 0) { |
| r = k; |
| continue; |
| } |
| |
| if (!match_sysname(enumerator, sysname)) |
| continue; |
| |
| if (!device_match_parent(device, enumerator->match_parent, NULL)) |
| continue; |
| |
| if (!match_property(enumerator, device)) |
| continue; |
| |
| if (!device_match_sysattr(device, enumerator->match_sysattr, enumerator->nomatch_sysattr)) |
| continue; |
| |
| k = device_enumerator_add_device(enumerator, device); |
| if (k < 0) { |
| r = k; |
| continue; |
| } |
| } |
| |
| return r; |
| } |
| |
| static int enumerator_scan_devices_tags(sd_device_enumerator *enumerator) { |
| const char *tag; |
| int r = 0; |
| |
| assert(enumerator); |
| |
| SET_FOREACH(tag, enumerator->match_tag) { |
| int k; |
| |
| k = enumerator_scan_devices_tag(enumerator, tag); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int parent_add_child(sd_device_enumerator *enumerator, const char *path) { |
| _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
| const char *subsystem, *sysname; |
| int r; |
| |
| r = sd_device_new_from_syspath(&device, path); |
| if (r == -ENODEV) |
| /* this is necessarily racy, so ignore missing devices */ |
| return 0; |
| else if (r < 0) |
| return r; |
| |
| r = sd_device_get_subsystem(device, &subsystem); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| if (!match_subsystem(enumerator, subsystem)) |
| return 0; |
| |
| r = sd_device_get_sysname(device, &sysname); |
| if (r < 0) |
| return r; |
| |
| if (!match_sysname(enumerator, sysname)) |
| return 0; |
| |
| if (!match_property(enumerator, device)) |
| return 0; |
| |
| if (!device_match_sysattr(device, enumerator->match_sysattr, enumerator->nomatch_sysattr)) |
| return 0; |
| |
| r = device_enumerator_add_device(enumerator, device); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int parent_crawl_children(sd_device_enumerator *enumerator, const char *path, unsigned maxdepth) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| struct dirent *dent; |
| int r = 0; |
| |
| dir = opendir(path); |
| if (!dir) |
| return log_debug_errno(errno, "sd-device-enumerator: Failed to open parent directory %s: %m", path); |
| |
| FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
| _cleanup_free_ char *child = NULL; |
| int k; |
| |
| if (dent->d_name[0] == '.') |
| continue; |
| |
| if (dent->d_type != DT_DIR) |
| continue; |
| |
| child = path_join(path, dent->d_name); |
| if (!child) |
| return -ENOMEM; |
| |
| k = parent_add_child(enumerator, child); |
| if (k < 0) |
| r = k; |
| |
| if (maxdepth > 0) |
| parent_crawl_children(enumerator, child, maxdepth - 1); |
| else |
| log_debug("sd-device-enumerator: Max depth reached, %s: ignoring devices", child); |
| } |
| |
| return r; |
| } |
| |
| static int enumerator_scan_devices_children(sd_device_enumerator *enumerator) { |
| const char *path; |
| int r = 0, k; |
| |
| SET_FOREACH(path, enumerator->match_parent) { |
| k = parent_add_child(enumerator, path); |
| if (k < 0) |
| r = k; |
| |
| k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int enumerator_scan_devices_all(sd_device_enumerator *enumerator) { |
| int r = 0; |
| |
| log_debug("sd-device-enumerator: Scan all dirs"); |
| |
| if (access("/sys/subsystem", F_OK) >= 0) { |
| /* we have /subsystem/, forget all the old stuff */ |
| r = enumerator_scan_dir(enumerator, "subsystem", "devices", NULL); |
| if (r < 0) |
| return log_debug_errno(r, "sd-device-enumerator: Failed to scan /sys/subsystem: %m"); |
| } else { |
| int k; |
| |
| k = enumerator_scan_dir(enumerator, "bus", "devices", NULL); |
| if (k < 0) |
| r = log_debug_errno(k, "sd-device-enumerator: Failed to scan /sys/bus: %m"); |
| |
| k = enumerator_scan_dir(enumerator, "class", NULL, NULL); |
| if (k < 0) |
| r = log_debug_errno(k, "sd-device-enumerator: Failed to scan /sys/class: %m"); |
| } |
| |
| return r; |
| } |
| |
| static void device_enumerator_dedup_devices(sd_device_enumerator *enumerator) { |
| sd_device **a, **b, **end; |
| |
| assert(enumerator); |
| |
| if (enumerator->n_devices <= 1) |
| return; |
| |
| a = enumerator->devices + 1; |
| b = enumerator->devices; |
| end = enumerator->devices + enumerator->n_devices; |
| |
| for (; a < end; a++) { |
| const char *devpath_a, *devpath_b; |
| |
| assert_se(sd_device_get_devpath(*a, &devpath_a) >= 0); |
| assert_se(sd_device_get_devpath(*b, &devpath_b) >= 0); |
| |
| if (path_equal(devpath_a, devpath_b)) |
| sd_device_unref(*a); |
| else |
| *(++b) = *a; |
| } |
| |
| enumerator->n_devices = b - enumerator->devices + 1; |
| } |
| |
| int device_enumerator_scan_devices(sd_device_enumerator *enumerator) { |
| int r = 0, k; |
| |
| assert(enumerator); |
| |
| if (enumerator->scan_uptodate && |
| enumerator->type == DEVICE_ENUMERATION_TYPE_DEVICES) |
| return 0; |
| |
| for (size_t i = 0; i < enumerator->n_devices; i++) |
| sd_device_unref(enumerator->devices[i]); |
| |
| enumerator->n_devices = 0; |
| |
| if (!set_isempty(enumerator->match_tag)) { |
| k = enumerator_scan_devices_tags(enumerator); |
| if (k < 0) |
| r = k; |
| } else if (enumerator->match_parent) { |
| k = enumerator_scan_devices_children(enumerator); |
| if (k < 0) |
| r = k; |
| } else { |
| k = enumerator_scan_devices_all(enumerator); |
| if (k < 0) |
| r = k; |
| } |
| |
| typesafe_qsort(enumerator->devices, enumerator->n_devices, device_compare); |
| device_enumerator_dedup_devices(enumerator); |
| |
| enumerator->scan_uptodate = true; |
| enumerator->type = DEVICE_ENUMERATION_TYPE_DEVICES; |
| |
| return r; |
| } |
| |
| _public_ sd_device *sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator) { |
| int r; |
| |
| assert_return(enumerator, NULL); |
| |
| r = device_enumerator_scan_devices(enumerator); |
| if (r < 0) |
| return NULL; |
| |
| enumerator->current_device_index = 0; |
| |
| if (enumerator->n_devices == 0) |
| return NULL; |
| |
| return enumerator->devices[0]; |
| } |
| |
| _public_ sd_device *sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, NULL); |
| |
| if (!enumerator->scan_uptodate || |
| enumerator->type != DEVICE_ENUMERATION_TYPE_DEVICES || |
| enumerator->current_device_index + 1 >= enumerator->n_devices) |
| return NULL; |
| |
| return enumerator->devices[++enumerator->current_device_index]; |
| } |
| |
| int device_enumerator_scan_subsystems(sd_device_enumerator *enumerator) { |
| const char *subsysdir; |
| int r = 0, k; |
| |
| assert(enumerator); |
| |
| if (enumerator->scan_uptodate && |
| enumerator->type == DEVICE_ENUMERATION_TYPE_SUBSYSTEMS) |
| return 0; |
| |
| for (size_t i = 0; i < enumerator->n_devices; i++) |
| sd_device_unref(enumerator->devices[i]); |
| |
| enumerator->n_devices = 0; |
| |
| /* modules */ |
| if (match_subsystem(enumerator, "module")) { |
| k = enumerator_scan_dir_and_add_devices(enumerator, "module", NULL, NULL); |
| if (k < 0) |
| r = log_debug_errno(k, "sd-device-enumerator: Failed to scan modules: %m"); |
| } |
| |
| if (access("/sys/subsystem", F_OK) >= 0) |
| subsysdir = "subsystem"; |
| else |
| subsysdir = "bus"; |
| |
| /* subsystems (only buses support coldplug) */ |
| if (match_subsystem(enumerator, "subsystem")) { |
| k = enumerator_scan_dir_and_add_devices(enumerator, subsysdir, NULL, NULL); |
| if (k < 0) |
| r = log_debug_errno(k, "sd-device-enumerator: Failed to scan subsystems: %m"); |
| } |
| |
| /* subsystem drivers */ |
| if (match_subsystem(enumerator, "drivers")) { |
| k = enumerator_scan_dir(enumerator, subsysdir, "drivers", "drivers"); |
| if (k < 0) |
| r = log_debug_errno(k, "sd-device-enumerator: Failed to scan drivers: %m"); |
| } |
| |
| typesafe_qsort(enumerator->devices, enumerator->n_devices, device_compare); |
| device_enumerator_dedup_devices(enumerator); |
| |
| enumerator->scan_uptodate = true; |
| enumerator->type = DEVICE_ENUMERATION_TYPE_SUBSYSTEMS; |
| |
| return r; |
| } |
| |
| _public_ sd_device *sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator) { |
| int r; |
| |
| assert_return(enumerator, NULL); |
| |
| r = device_enumerator_scan_subsystems(enumerator); |
| if (r < 0) |
| return NULL; |
| |
| enumerator->current_device_index = 0; |
| |
| if (enumerator->n_devices == 0) |
| return NULL; |
| |
| return enumerator->devices[0]; |
| } |
| |
| _public_ sd_device *sd_device_enumerator_get_subsystem_next(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, NULL); |
| |
| if (!enumerator->scan_uptodate || |
| enumerator->type != DEVICE_ENUMERATION_TYPE_SUBSYSTEMS || |
| enumerator->current_device_index + 1 >= enumerator->n_devices) |
| return NULL; |
| |
| return enumerator->devices[++enumerator->current_device_index]; |
| } |
| |
| sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, NULL); |
| |
| if (!enumerator->scan_uptodate) |
| return NULL; |
| |
| enumerator->current_device_index = 0; |
| |
| if (enumerator->n_devices == 0) |
| return NULL; |
| |
| return enumerator->devices[0]; |
| } |
| |
| sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator) { |
| assert_return(enumerator, NULL); |
| |
| if (!enumerator->scan_uptodate || |
| enumerator->current_device_index + 1 >= enumerator->n_devices) |
| return NULL; |
| |
| return enumerator->devices[++enumerator->current_device_index]; |
| } |
| |
| sd_device **device_enumerator_get_devices(sd_device_enumerator *enumerator, size_t *ret_n_devices) { |
| assert(enumerator); |
| assert(ret_n_devices); |
| |
| if (!enumerator->scan_uptodate) |
| return NULL; |
| |
| *ret_n_devices = enumerator->n_devices; |
| return enumerator->devices; |
| } |
