986 lines
29 KiB
C
986 lines
29 KiB
C
/***
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This file is part of systemd.
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Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
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Copyright 2014-2015 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-device.h"
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#include "device-enumerator-private.h"
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#include "device-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "prioq.h"
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#include "set.h"
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#include "string-util.h"
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#include "strv.h"
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#include "util.h"
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#define DEVICE_ENUMERATE_MAX_DEPTH 256
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typedef enum DeviceEnumerationType {
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DEVICE_ENUMERATION_TYPE_DEVICES,
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DEVICE_ENUMERATION_TYPE_SUBSYSTEMS,
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_DEVICE_ENUMERATION_TYPE_MAX,
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_DEVICE_ENUMERATION_TYPE_INVALID = -1,
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} DeviceEnumerationType;
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struct sd_device_enumerator {
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unsigned n_ref;
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DeviceEnumerationType type;
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Prioq *devices;
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bool scan_uptodate;
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Set *match_subsystem;
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Set *nomatch_subsystem;
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Hashmap *match_sysattr;
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Hashmap *nomatch_sysattr;
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Hashmap *match_property;
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Set *match_sysname;
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Set *match_tag;
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sd_device *match_parent;
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bool match_allow_uninitialized;
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};
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_public_ int sd_device_enumerator_new(sd_device_enumerator **ret) {
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_cleanup_device_enumerator_unref_ sd_device_enumerator *enumerator = NULL;
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assert(ret);
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enumerator = new0(sd_device_enumerator, 1);
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if (!enumerator)
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return -ENOMEM;
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enumerator->n_ref = 1;
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enumerator->type = _DEVICE_ENUMERATION_TYPE_INVALID;
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*ret = enumerator;
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enumerator = NULL;
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return 0;
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}
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_public_ sd_device_enumerator *sd_device_enumerator_ref(sd_device_enumerator *enumerator) {
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assert_return(enumerator, NULL);
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assert_se((++ enumerator->n_ref) >= 2);
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return enumerator;
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}
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_public_ sd_device_enumerator *sd_device_enumerator_unref(sd_device_enumerator *enumerator) {
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if (enumerator && (-- enumerator->n_ref) == 0) {
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sd_device *device;
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while ((device = prioq_pop(enumerator->devices)))
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sd_device_unref(device);
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prioq_free(enumerator->devices);
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set_free_free(enumerator->match_subsystem);
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set_free_free(enumerator->nomatch_subsystem);
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hashmap_free_free_free(enumerator->match_sysattr);
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hashmap_free_free_free(enumerator->nomatch_sysattr);
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hashmap_free_free_free(enumerator->match_property);
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set_free_free(enumerator->match_sysname);
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set_free_free(enumerator->match_tag);
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sd_device_unref(enumerator->match_parent);
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free(enumerator);
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}
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return NULL;
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}
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_public_ int sd_device_enumerator_add_match_subsystem(sd_device_enumerator *enumerator, const char *subsystem, int match) {
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Set **set;
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(subsystem, -EINVAL);
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if (match)
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set = &enumerator->match_subsystem;
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else
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set = &enumerator->nomatch_subsystem;
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r = set_ensure_allocated(set, NULL);
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if (r < 0)
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return r;
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r = set_put_strdup(*set, subsystem);
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if (r < 0)
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return r;
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_add_match_sysattr(sd_device_enumerator *enumerator, const char *_sysattr, const char *_value, int match) {
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_cleanup_free_ char *sysattr = NULL, *value = NULL;
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Hashmap **hashmap;
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(_sysattr, -EINVAL);
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if (match)
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hashmap = &enumerator->match_sysattr;
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else
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hashmap = &enumerator->nomatch_sysattr;
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r = hashmap_ensure_allocated(hashmap, NULL);
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if (r < 0)
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return r;
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sysattr = strdup(_sysattr);
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if (!sysattr)
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return -ENOMEM;
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if (_value) {
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value = strdup(_value);
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if (!value)
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return -ENOMEM;
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}
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r = hashmap_put(*hashmap, sysattr, value);
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if (r < 0)
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return r;
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sysattr = NULL;
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value = NULL;
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_add_match_property(sd_device_enumerator *enumerator, const char *_property, const char *_value) {
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_cleanup_free_ char *property = NULL, *value = NULL;
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(_property, -EINVAL);
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r = hashmap_ensure_allocated(&enumerator->match_property, NULL);
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if (r < 0)
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return r;
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property = strdup(_property);
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if (!property)
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return -ENOMEM;
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if (_value) {
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value = strdup(_value);
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if (!value)
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return -ENOMEM;
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}
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r = hashmap_put(enumerator->match_property, property, value);
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if (r < 0)
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return r;
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property = NULL;
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value = NULL;
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_add_match_sysname(sd_device_enumerator *enumerator, const char *sysname) {
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(sysname, -EINVAL);
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r = set_ensure_allocated(&enumerator->match_sysname, NULL);
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if (r < 0)
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return r;
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r = set_put_strdup(enumerator->match_sysname, sysname);
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if (r < 0)
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return r;
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator, const char *tag) {
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(tag, -EINVAL);
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r = set_ensure_allocated(&enumerator->match_tag, NULL);
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if (r < 0)
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return r;
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r = set_put_strdup(enumerator->match_tag, tag);
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if (r < 0)
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return r;
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) {
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assert_return(enumerator, -EINVAL);
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assert_return(parent, -EINVAL);
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sd_device_unref(enumerator->match_parent);
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enumerator->match_parent = sd_device_ref(parent);
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enumerator->scan_uptodate = false;
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return 0;
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}
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_public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) {
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assert_return(enumerator, -EINVAL);
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enumerator->match_allow_uninitialized = true;
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enumerator->scan_uptodate = false;
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return 0;
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}
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int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator) {
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assert_return(enumerator, -EINVAL);
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enumerator->match_allow_uninitialized = false;
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enumerator->scan_uptodate = false;
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return 0;
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}
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static int device_compare(const void *_a, const void *_b) {
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sd_device *a = (sd_device *)_a, *b = (sd_device *)_b;
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const char *devpath_a, *devpath_b, *sound_a;
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bool delay_a, delay_b;
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assert_se(sd_device_get_devpath(a, &devpath_a) >= 0);
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assert_se(sd_device_get_devpath(b, &devpath_b) >= 0);
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sound_a = strstr(devpath_a, "/sound/card");
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if (sound_a) {
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/* For sound cards the control device must be enumerated last to
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* make sure it's the final device node that gets ACLs applied.
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* Applications rely on this fact and use ACL changes on the
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* control node as an indicator that the ACL change of the
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* entire sound card completed. The kernel makes this guarantee
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* when creating those devices, and hence we should too when
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* enumerating them. */
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sound_a += strlen("/sound/card");
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sound_a = strchr(sound_a, '/');
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if (sound_a) {
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unsigned prefix_len;
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prefix_len = sound_a - devpath_a;
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if (strncmp(devpath_a, devpath_b, prefix_len) == 0) {
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const char *sound_b;
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sound_b = devpath_b + prefix_len;
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if (startswith(sound_a, "/controlC") &&
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!startswith(sound_b, "/contolC"))
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return 1;
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if (!startswith(sound_a, "/controlC") &&
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startswith(sound_b, "/controlC"))
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return -1;
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}
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}
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}
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/* md and dm devices are enumerated after all other devices */
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delay_a = strstr(devpath_a, "/block/md") || strstr(devpath_a, "/block/dm-");
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delay_b = strstr(devpath_b, "/block/md") || strstr(devpath_b, "/block/dm-");
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if (delay_a != delay_b)
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return delay_a - delay_b;
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return strcmp(devpath_a, devpath_b);
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}
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int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device) {
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int r;
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assert_return(enumerator, -EINVAL);
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assert_return(device, -EINVAL);
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r = prioq_ensure_allocated(&enumerator->devices, device_compare);
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if (r < 0)
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return r;
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r = prioq_put(enumerator->devices, device, NULL);
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if (r < 0)
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return r;
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sd_device_ref(device);
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return 0;
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}
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static bool match_sysattr_value(sd_device *device, const char *sysattr, const char *match_value) {
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const char *value;
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int r;
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assert(device);
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assert(sysattr);
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r = sd_device_get_sysattr_value(device, sysattr, &value);
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if (r < 0)
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return false;
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if (!match_value)
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return true;
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if (fnmatch(match_value, value, 0) == 0)
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return true;
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return false;
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}
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static bool match_sysattr(sd_device_enumerator *enumerator, sd_device *device) {
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const char *sysattr;
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const char *value;
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Iterator i;
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assert(enumerator);
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assert(device);
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HASHMAP_FOREACH_KEY(value, sysattr, enumerator->nomatch_sysattr, i)
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if (match_sysattr_value(device, sysattr, value))
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return false;
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HASHMAP_FOREACH_KEY(value, sysattr, enumerator->match_sysattr, i)
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if (!match_sysattr_value(device, sysattr, value))
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return false;
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return true;
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}
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static bool match_property(sd_device_enumerator *enumerator, sd_device *device) {
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const char *property;
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const char *value;
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Iterator i;
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assert(enumerator);
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assert(device);
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if (hashmap_isempty(enumerator->match_property))
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return true;
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HASHMAP_FOREACH_KEY(value, property, enumerator->match_property, i) {
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const char *property_dev, *value_dev;
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FOREACH_DEVICE_PROPERTY(device, property_dev, value_dev) {
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if (fnmatch(property, property_dev, 0) != 0)
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continue;
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if (!value && !value_dev)
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return true;
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if (!value || !value_dev)
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continue;
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if (fnmatch(value, value_dev, 0) == 0)
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return true;
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}
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}
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return false;
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}
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static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) {
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const char *tag;
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Iterator i;
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assert(enumerator);
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assert(device);
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SET_FOREACH(tag, enumerator->match_tag, i)
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if (!sd_device_has_tag(device, tag))
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return false;
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return true;
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}
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static bool match_parent(sd_device_enumerator *enumerator, sd_device *device) {
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const char *devpath, *devpath_dev;
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int r;
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assert(enumerator);
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assert(device);
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if (!enumerator->match_parent)
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return true;
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r = sd_device_get_devpath(enumerator->match_parent, &devpath);
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assert(r >= 0);
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r = sd_device_get_devpath(device, &devpath_dev);
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assert(r >= 0);
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return startswith(devpath_dev, devpath);
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}
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static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) {
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const char *sysname_match;
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Iterator i;
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assert(enumerator);
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assert(sysname);
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if (set_isempty(enumerator->match_sysname))
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return true;
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SET_FOREACH(sysname_match, enumerator->match_sysname, i)
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if (fnmatch(sysname_match, sysname, 0) == 0)
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return true;
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return false;
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}
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static int enumerator_scan_dir_and_add_devices(sd_device_enumerator *enumerator, const char *basedir, const char *subdir1, const char *subdir2) {
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_cleanup_closedir_ DIR *dir = NULL;
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char *path;
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struct dirent *dent;
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int r = 0;
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assert(enumerator);
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assert(basedir);
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path = strjoina("/sys/", basedir, "/");
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if (subdir1)
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path = strjoina(path, subdir1, "/");
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if (subdir2)
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path = strjoina(path, subdir2, "/");
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dir = opendir(path);
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if (!dir)
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return -errno;
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FOREACH_DIRENT_ALL(dent, dir, return -errno) {
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_cleanup_device_unref_ sd_device *device = NULL;
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char syspath[strlen(path) + 1 + strlen(dent->d_name) + 1];
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dev_t devnum;
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int ifindex, initialized, k;
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if (dent->d_name[0] == '.')
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continue;
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if (!match_sysname(enumerator, dent->d_name))
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continue;
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(void)sprintf(syspath, "%s%s", path, dent->d_name);
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k = sd_device_new_from_syspath(&device, syspath);
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if (k < 0) {
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if (k != -ENODEV)
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/* this is necessarily racey, so ignore missing devices */
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r = k;
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continue;
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}
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k = sd_device_get_devnum(device, &devnum);
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if (k < 0) {
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r = k;
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continue;
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}
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k = sd_device_get_ifindex(device, &ifindex);
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if (k < 0) {
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r = k;
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continue;
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}
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k = sd_device_get_is_initialized(device, &initialized);
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if (k < 0) {
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r = k;
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continue;
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}
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/*
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* All devices with a device node or network interfaces
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* possibly need udev to adjust the device node permission
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* or context, or rename the interface before it can be
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* reliably used from other processes.
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*
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* For now, we can only check these types of devices, we
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* might not store a database, and have no way to find out
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* for all other types of devices.
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*/
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if (!enumerator->match_allow_uninitialized &&
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!initialized &&
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(major(devnum) > 0 || ifindex > 0))
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continue;
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if (!match_parent(enumerator, device))
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continue;
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if (!match_tag(enumerator, device))
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continue;
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if (!match_property(enumerator, device))
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continue;
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if (!match_sysattr(enumerator, device))
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continue;
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k = device_enumerator_add_device(enumerator, device);
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if (k < 0)
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r = k;
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}
|
|
|
|
return r;
|
|
}
|
|
|
|
static bool match_subsystem(sd_device_enumerator *enumerator, const char *subsystem) {
|
|
const char *subsystem_match;
|
|
Iterator i;
|
|
|
|
assert(enumerator);
|
|
|
|
if (!subsystem)
|
|
return false;
|
|
|
|
SET_FOREACH(subsystem_match, enumerator->nomatch_subsystem, i)
|
|
if (fnmatch(subsystem_match, subsystem, 0) == 0)
|
|
return false;
|
|
|
|
if (set_isempty(enumerator->match_subsystem))
|
|
return true;
|
|
|
|
SET_FOREACH(subsystem_match, enumerator->match_subsystem, i)
|
|
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(" 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 0;
|
|
else {
|
|
log_error("sd-device-enumerator: could not open tags directory %s: %m", path);
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
/* TODO: filter away subsystems? */
|
|
|
|
FOREACH_DIRENT_ALL(dent, dir, return -errno) {
|
|
_cleanup_device_unref_ 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) {
|
|
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 (!match_parent(enumerator, device))
|
|
continue;
|
|
|
|
if (!match_property(enumerator, device))
|
|
continue;
|
|
|
|
if (!match_sysattr(enumerator, device))
|
|
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;
|
|
Iterator i;
|
|
int r;
|
|
|
|
assert(enumerator);
|
|
|
|
SET_FOREACH(tag, enumerator->match_tag, i) {
|
|
r = enumerator_scan_devices_tag(enumerator, tag);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parent_add_child(sd_device_enumerator *enumerator, const char *path) {
|
|
_cleanup_device_unref_ 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 (!match_sysattr(enumerator, device))
|
|
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) {
|
|
log_debug("sd-device-enumerate: could not open parent directory %s: %m", path);
|
|
return -errno;
|
|
}
|
|
|
|
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 = strjoin(path, "/", dent->d_name, NULL);
|
|
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("device-enumerate: 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;
|
|
|
|
r = sd_device_get_syspath(enumerator->match_parent, &path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
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("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, "device-enumerator: failed to scan /sys/subsystem: %m");
|
|
} else {
|
|
int k;
|
|
|
|
k = enumerator_scan_dir(enumerator, "bus", "devices", NULL);
|
|
if (k < 0) {
|
|
log_debug_errno(k, "device-enumerator: failed to scan /sys/bus: %m");
|
|
r = k;
|
|
}
|
|
|
|
k = enumerator_scan_dir(enumerator, "class", NULL, NULL);
|
|
if (k < 0) {
|
|
log_debug_errno(k, "device-enumerator: failed to scan /sys/class: %m");
|
|
r = k;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int device_enumerator_scan_devices(sd_device_enumerator *enumerator) {
|
|
sd_device *device;
|
|
int r;
|
|
|
|
assert(enumerator);
|
|
|
|
if (enumerator->scan_uptodate &&
|
|
enumerator->type == DEVICE_ENUMERATION_TYPE_DEVICES)
|
|
return 0;
|
|
|
|
while ((device = prioq_pop(enumerator->devices)))
|
|
sd_device_unref(device);
|
|
|
|
if (!set_isempty(enumerator->match_tag)) {
|
|
r = enumerator_scan_devices_tags(enumerator);
|
|
if (r < 0)
|
|
return r;
|
|
} else if (enumerator->match_parent) {
|
|
r = enumerator_scan_devices_children(enumerator);
|
|
if (r < 0)
|
|
return r;
|
|
} else {
|
|
r = enumerator_scan_devices_all(enumerator);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
enumerator->scan_uptodate = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_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->type = DEVICE_ENUMERATION_TYPE_DEVICES;
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|
|
|
|
_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)
|
|
return NULL;
|
|
|
|
sd_device_unref(prioq_pop(enumerator->devices));
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|
|
|
|
int device_enumerator_scan_subsystems(sd_device_enumerator *enumerator) {
|
|
sd_device *device;
|
|
const char *subsysdir;
|
|
int r = 0, k;
|
|
|
|
assert(enumerator);
|
|
|
|
if (enumerator->scan_uptodate &&
|
|
enumerator->type == DEVICE_ENUMERATION_TYPE_SUBSYSTEMS)
|
|
return 0;
|
|
|
|
while ((device = prioq_pop(enumerator->devices)))
|
|
sd_device_unref(device);
|
|
|
|
/* modules */
|
|
if (match_subsystem(enumerator, "module")) {
|
|
k = enumerator_scan_dir_and_add_devices(enumerator, "module", NULL, NULL);
|
|
if (k < 0) {
|
|
log_debug_errno(k, "device-enumerator: failed to scan modules: %m");
|
|
r = k;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
log_debug_errno(k, "device-enumerator: failed to scan subsystems: %m");
|
|
r = k;
|
|
}
|
|
}
|
|
|
|
/* subsystem drivers */
|
|
if (match_subsystem(enumerator, "drivers")) {
|
|
k = enumerator_scan_dir(enumerator, subsysdir, "drivers", "drivers");
|
|
if (k < 0) {
|
|
log_debug_errno(k, "device-enumerator: failed to scan drivers: %m");
|
|
r = k;
|
|
}
|
|
}
|
|
|
|
enumerator->scan_uptodate = true;
|
|
|
|
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->type = DEVICE_ENUMERATION_TYPE_SUBSYSTEMS;
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|
|
|
|
_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)
|
|
return NULL;
|
|
|
|
sd_device_unref(prioq_pop(enumerator->devices));
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|
|
|
|
sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator) {
|
|
assert_return(enumerator, NULL);
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|
|
|
|
sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator) {
|
|
assert_return(enumerator, NULL);
|
|
|
|
sd_device_unref(prioq_pop(enumerator->devices));
|
|
|
|
return prioq_peek(enumerator->devices);
|
|
}
|