[thirdparty/systemd.git] / src / udev / udevadm-trigger.c

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "fd-util.h"
#include "set.h"
#include "string-util.h"
#include "udev-util.h"
#include "udev.h"
#include "udevadm-util.h"
#include "util.h"

static int verbose;
static int dry_run;

static void exec_list(struct udev_enumerate *udev_enumerate, const char *action, Set *settle_set) {
        struct udev_list_entry *entry;

        udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
                char filename[UTIL_PATH_SIZE];
                const char *syspath;
                int fd;

                syspath = udev_list_entry_get_name(entry);
                if (verbose)
                        printf("%s\n", syspath);
                if (dry_run)
                        continue;

                strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
                fd = open(filename, O_WRONLY|O_CLOEXEC);
                if (fd < 0)
                        continue;
                if (settle_set != NULL)
                        set_put_strdup(settle_set, syspath);
                if (write(fd, action, strlen(action)) < 0)
                        log_debug_errno(errno, "error writing '%s' to '%s': %m", action, filename);
                close(fd);
        }
}

static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
        char *pos;

        strscpy(buf, size,str);
        pos = strchr(buf, '=');
        if (pos != NULL) {
                pos[0] = 0;
                pos++;
        }
        *val = pos;
        return buf;
}

static void help(void) {
        printf("%s trigger [OPTIONS] DEVPATH\n\n"
               "Request events from the kernel.\n\n"
               "  -h --help                         Show this help\n"
               "  -V --version                      Show package version\n"
               "  -v --verbose                      Print the list of devices while running\n"
               "  -n --dry-run                      Do not actually trigger the events\n"
               "  -t --type=                        Type of events to trigger\n"
               "          devices                     sysfs devices (default)\n"
               "          subsystems                  sysfs subsystems and drivers\n"
               "  -c --action=ACTION                Event action value, default is \"change\"\n"
               "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
               "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
               "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
               "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
               "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
               "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
               "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
               "     --name-match=NAME              Trigger devices with this /dev name\n"
               "  -b --parent-match=NAME            Trigger devices with that parent device\n"
               "  -w --settle                       Wait for the triggered events to complete\n"
               , program_invocation_short_name);
}

static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
        enum {
                ARG_NAME = 0x100,
        };

        static const struct option options[] = {
                { "verbose",           no_argument,       NULL, 'v'      },
                { "dry-run",           no_argument,       NULL, 'n'      },
                { "type",              required_argument, NULL, 't'      },
                { "action",            required_argument, NULL, 'c'      },
                { "subsystem-match",   required_argument, NULL, 's'      },
                { "subsystem-nomatch", required_argument, NULL, 'S'      },
                { "attr-match",        required_argument, NULL, 'a'      },
                { "attr-nomatch",      required_argument, NULL, 'A'      },
                { "property-match",    required_argument, NULL, 'p'      },
                { "tag-match",         required_argument, NULL, 'g'      },
                { "sysname-match",     required_argument, NULL, 'y'      },
                { "name-match",        required_argument, NULL, ARG_NAME },
                { "parent-match",      required_argument, NULL, 'b'      },
                { "settle",            no_argument,       NULL, 'w'      },
                { "version",           no_argument,       NULL, 'V'      },
                { "help",              no_argument,       NULL, 'h'      },
                {}
        };
        enum {
                TYPE_DEVICES,
                TYPE_SUBSYSTEMS,
        } device_type = TYPE_DEVICES;
        const char *action = "change";
        _cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
        _cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL;
        _cleanup_close_ int fd_ep = -1;
        int fd_udev = -1;
        struct epoll_event ep_udev;
        bool settle = false;
        _cleanup_set_free_free_ Set *settle_set = NULL;
        int c, r;

        udev_enumerate = udev_enumerate_new(udev);
        if (udev_enumerate == NULL)
                return 1;

        while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
                const char *key;
                const char *val;
                char buf[UTIL_PATH_SIZE];

                switch (c) {
                case 'v':
                        verbose = 1;
                        break;
                case 'n':
                        dry_run = 1;
                        break;
                case 't':
                        if (streq(optarg, "devices"))
                                device_type = TYPE_DEVICES;
                        else if (streq(optarg, "subsystems"))
                                device_type = TYPE_SUBSYSTEMS;
                        else {
                                log_error("unknown type --type=%s", optarg);
                                return 2;
                        }
                        break;
                case 'c':
                        if (!STR_IN_SET(optarg, "add", "remove", "change")) {
                                log_error("unknown action '%s'", optarg);
                                return 2;
                        } else
                                action = optarg;

                        break;
                case 's':
                        r = udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
                        if (r < 0) {
                                log_error_errno(r, "could not add subsystem match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                case 'S':
                        r = udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
                        if (r < 0) {
                                log_error_errno(r, "could not add negative subsystem match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                case 'a':
                        key = keyval(optarg, &val, buf, sizeof(buf));
                        r = udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
                        if (r < 0) {
                                log_error_errno(r, "could not add sysattr match '%s=%s': %m", key, val);
                                return 2;
                        }
                        break;
                case 'A':
                        key = keyval(optarg, &val, buf, sizeof(buf));
                        r = udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
                        if (r < 0) {
                                log_error_errno(r, "could not add negative sysattr match '%s=%s': %m", key, val);
                                return 2;
                        }
                        break;
                case 'p':
                        key = keyval(optarg, &val, buf, sizeof(buf));
                        r = udev_enumerate_add_match_property(udev_enumerate, key, val);
                        if (r < 0) {
                                log_error_errno(r, "could not add property match '%s=%s': %m", key, val);
                                return 2;
                        }
                        break;
                case 'g':
                        r = udev_enumerate_add_match_tag(udev_enumerate, optarg);
                        if (r < 0) {
                                log_error_errno(r, "could not add tag match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                case 'y':
                        r = udev_enumerate_add_match_sysname(udev_enumerate, optarg);
                        if (r < 0) {
                                log_error_errno(r, "could not add sysname match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                case 'b': {
                        _cleanup_udev_device_unref_ struct udev_device *dev;

                        dev = find_device(udev, optarg, "/sys");
                        if (dev == NULL) {
                                log_error("unable to open the device '%s'", optarg);
                                return 2;
                        }

                        r = udev_enumerate_add_match_parent(udev_enumerate, dev);
                        if (r < 0) {
                                log_error_errno(r, "could not add parent match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                }
                case 'w':
                        settle = true;
                        break;

                case ARG_NAME: {
                        _cleanup_udev_device_unref_ struct udev_device *dev;

                        dev = find_device(udev, optarg, "/dev/");
                        if (dev == NULL) {
                                log_error("unable to open the device '%s'", optarg);
                                return 2;
                        }

                        r = udev_enumerate_add_match_parent(udev_enumerate, dev);
                        if (r < 0) {
                                log_error_errno(r, "could not add parent match '%s': %m", optarg);
                                return 2;
                        }
                        break;
                }

                case 'V':
                        print_version();
                        return 0;
                case 'h':
                        help();
                        return 0;
                case '?':
                        return 1;
                default:
                        assert_not_reached("Unknown option");
                }
        }

        for (; optind < argc; optind++) {
                _cleanup_udev_device_unref_ struct udev_device *dev;

                dev = find_device(udev, argv[optind], NULL);
                if (dev == NULL) {
                        log_error("unable to open the device '%s'", argv[optind]);
                        return 2;
                }

                r = udev_enumerate_add_match_parent(udev_enumerate, dev);
                if (r < 0) {
                        log_error_errno(r, "could not add tag match '%s': %m", optarg);
                        return 2;
                }
        }

        if (settle) {
                fd_ep = epoll_create1(EPOLL_CLOEXEC);
                if (fd_ep < 0) {
                        log_error_errno(errno, "error creating epoll fd: %m");
                        return 1;
                }

                udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
                if (udev_monitor == NULL) {
                        log_error("error: unable to create netlink socket");
                        return 3;
                }
                fd_udev = udev_monitor_get_fd(udev_monitor);

                if (udev_monitor_enable_receiving(udev_monitor) < 0) {
                        log_error("error: unable to subscribe to udev events");
                        return 4;
                }

                ep_udev = (struct epoll_event) { .events = EPOLLIN, .data.fd = fd_udev };
                if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
                        log_error_errno(errno, "fail to add fd to epoll: %m");
                        return 5;
                }

                settle_set = set_new(&string_hash_ops);
                if (settle_set == NULL) {
                        log_oom();
                        return 1;
                }
        }

        switch (device_type) {
        case TYPE_SUBSYSTEMS:
                udev_enumerate_scan_subsystems(udev_enumerate);
                break;
        case TYPE_DEVICES:
                udev_enumerate_scan_devices(udev_enumerate);
                break;
        default:
                assert_not_reached("device_type");
        }
        exec_list(udev_enumerate, action, settle_set);

        while (!set_isempty(settle_set)) {
                int fdcount;
                struct epoll_event ev[4];
                int i;

                fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
                if (fdcount < 0) {
                        if (errno != EINTR)
                                log_error_errno(errno, "error receiving uevent message: %m");
                        continue;
                }

                for (i = 0; i < fdcount; i++) {
                        if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
                                _cleanup_udev_device_unref_ struct udev_device *device;
                                const char *syspath = NULL;

                                device = udev_monitor_receive_device(udev_monitor);
                                if (device == NULL)
                                        continue;

                                syspath = udev_device_get_syspath(device);
                                if (verbose)
                                        printf("settle %s\n", syspath);
                                if (!set_remove(settle_set, syspath))
                                        log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
                        }
                }
        }

        return 0;
}

const struct udevadm_cmd udevadm_trigger = {
        .name = "trigger",
        .cmd = adm_trigger,
        .help = "Request events from the kernel",
};
Commit	Line	Data
e7145211	1	/* SPDX-License-Identifier: GPL-2.0+ */
0d5be398	2	/*
1298001e	3	* Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
0d5be398	4	*
55e9959b KS	5	* This program is free software: you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation, either version 2 of the License, or
	8	* (at your option) any later version.
0d5be398	9	*
55e9959b KS	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
0d5be398 KS	17	*/
0d5be398 KS	18
07630cea LP	19	#include <errno.h>
	20	#include <fcntl.h>
	21	#include <getopt.h>
0d5be398	22	#include <stddef.h>
0d5be398	23	#include <stdio.h>
07630cea	24	#include <string.h>
0d5be398	25	#include <unistd.h>
0d5be398	26
792cc203 MH	27	#include "fd-util.h"
792cc203 MH	28	#include "set.h"
07630cea	29	#include "string-util.h"
44433ebd	30	#include "udev-util.h"
07630cea	31	#include "udev.h"
d6170d27	32	#include "udevadm-util.h"
c5383e79	33	#include "util.h"
0d5be398	34
c48622cc KS	35	static int verbose;
c48622cc KS	36	static int dry_run;
c48622cc	37
792cc203	38	static void exec_list(struct udev_enumerate udev_enumerate, const char action, Set *settle_set) {
912541b0 KS	39	struct udev_list_entry *entry;
	40
	41	udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
	42	char filename[UTIL_PATH_SIZE];
792cc203	43	const char *syspath;
912541b0 KS	44	int fd;
912541b0 KS	45
792cc203	46	syspath = udev_list_entry_get_name(entry);
912541b0	47	if (verbose)
792cc203	48	printf("%s\n", syspath);
912541b0 KS	49	if (dry_run)
912541b0 KS	50	continue;
792cc203 MH	51
792cc203 MH	52	strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
c8a202b7	53	fd = open(filename, O_WRONLY\|O_CLOEXEC);
baa30fbc	54	if (fd < 0)
912541b0	55	continue;
792cc203 MH	56	if (settle_set != NULL)
792cc203 MH	57	set_put_strdup(settle_set, syspath);
912541b0	58	if (write(fd, action, strlen(action)) < 0)
56f64d95	59	log_debug_errno(errno, "error writing '%s' to '%s': %m", action, filename);
912541b0 KS	60	close(fd);
912541b0 KS	61	}
0d5be398 KS	62	}
0d5be398 KS	63
9ec6e95b	64	static const char keyval(const char str, const char *val, char buf, size_t size) {
912541b0 KS	65	char *pos;
912541b0 KS	66
d5a89d7d	67	strscpy(buf, size,str);
912541b0 KS	68	pos = strchr(buf, '=');
	69	if (pos != NULL) {
	70	pos[0] = 0;
	71	pos++;
	72	}
	73	*val = pos;
	74	return buf;
80381823 KS	75	}
80381823 KS	76
7643ac9a	77	static void help(void) {
5639df9a	78	printf("%s trigger [OPTIONS] DEVPATH\n\n"
5ac0162c LP	79	"Request events from the kernel.\n\n"
5ac0162c LP	80	" -h --help Show this help\n"
5639df9a	81	" -V --version Show package version\n"
5ac0162c LP	82	" -v --verbose Print the list of devices while running\n"
	83	" -n --dry-run Do not actually trigger the events\n"
	84	" -t --type= Type of events to trigger\n"
	85	" devices sysfs devices (default)\n"
	86	" subsystems sysfs subsystems and drivers\n"
	87	" -c --action=ACTION Event action value, default is \"change\"\n"
	88	" -s --subsystem-match=SUBSYSTEM Trigger devices from a matching subsystem\n"
	89	" -S --subsystem-nomatch=SUBSYSTEM Exclude devices from a matching subsystem\n"
	90	" -a --attr-match=FILE[=VALUE] Trigger devices with a matching attribute\n"
	91	" -A --attr-nomatch=FILE[=VALUE] Exclude devices with a matching attribute\n"
	92	" -p --property-match=KEY=VALUE Trigger devices with a matching property\n"
	93	" -g --tag-match=KEY=VALUE Trigger devices with a matching property\n"
	94	" -y --sysname-match=NAME Trigger devices with this /sys path\n"
	95	" --name-match=NAME Trigger devices with this /dev name\n"
	96	" -b --parent-match=NAME Trigger devices with that parent device\n"
792cc203	97	" -w --settle Wait for the triggered events to complete\n"
5ac0162c	98	, program_invocation_short_name);
7643ac9a ZJS	99	}
7643ac9a ZJS	100
9ec6e95b	101	static int adm_trigger(struct udev udev, int argc, char argv[]) {
80877656 ZJS	102	enum {
	103	ARG_NAME = 0x100,
	104	};
	105
912541b0	106	static const struct option options[] = {
80877656 ZJS	107	{ "verbose", no_argument, NULL, 'v' },
	108	{ "dry-run", no_argument, NULL, 'n' },
	109	{ "type", required_argument, NULL, 't' },
	110	{ "action", required_argument, NULL, 'c' },
	111	{ "subsystem-match", required_argument, NULL, 's' },
	112	{ "subsystem-nomatch", required_argument, NULL, 'S' },
	113	{ "attr-match", required_argument, NULL, 'a' },
	114	{ "attr-nomatch", required_argument, NULL, 'A' },
	115	{ "property-match", required_argument, NULL, 'p' },
	116	{ "tag-match", required_argument, NULL, 'g' },
	117	{ "sysname-match", required_argument, NULL, 'y' },
	118	{ "name-match", required_argument, NULL, ARG_NAME },
	119	{ "parent-match", required_argument, NULL, 'b' },
792cc203	120	{ "settle", no_argument, NULL, 'w' },
5639df9a	121	{ "version", no_argument, NULL, 'V' },
80877656	122	{ "help", no_argument, NULL, 'h' },
912541b0 KS	123	{}
	124	};
	125	enum {
	126	TYPE_DEVICES,
	127	TYPE_SUBSYSTEMS,
	128	} device_type = TYPE_DEVICES;
	129	const char *action = "change";
44433ebd	130	_cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
792cc203 MH	131	_cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL;
	132	_cleanup_close_ int fd_ep = -1;
	133	int fd_udev = -1;
	134	struct epoll_event ep_udev;
	135	bool settle = false;
	136	_cleanup_set_free_free_ Set *settle_set = NULL;
56b13bcc	137	int c, r;
912541b0	138
912541b0	139	udev_enumerate = udev_enumerate_new(udev);
44433ebd ZJS	140	if (udev_enumerate == NULL)
44433ebd ZJS	141	return 1;
912541b0	142
792cc203	143	while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
912541b0 KS	144	const char *key;
	145	const char *val;
	146	char buf[UTIL_PATH_SIZE];
	147
7643ac9a	148	switch (c) {
912541b0 KS	149	case 'v':
	150	verbose = 1;
	151	break;
	152	case 'n':
	153	dry_run = 1;
	154	break;
	155	case 't':
44433ebd	156	if (streq(optarg, "devices"))
912541b0	157	device_type = TYPE_DEVICES;
44433ebd	158	else if (streq(optarg, "subsystems"))
912541b0	159	device_type = TYPE_SUBSYSTEMS;
44433ebd	160	else {
9f6445e3	161	log_error("unknown type --type=%s", optarg);
44433ebd	162	return 2;
912541b0 KS	163	}
	164	break;
	165	case 'c':
5991ce44	166	if (!STR_IN_SET(optarg, "add", "remove", "change")) {
9f6445e3	167	log_error("unknown action '%s'", optarg);
44433ebd ZJS	168	return 2;
44433ebd ZJS	169	} else
c5383e79	170	action = optarg;
44433ebd	171
912541b0 KS	172	break;
912541b0 KS	173	case 's':
56b13bcc TG	174	r = udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
	175	if (r < 0) {
	176	log_error_errno(r, "could not add subsystem match '%s': %m", optarg);
	177	return 2;
	178	}
912541b0 KS	179	break;
912541b0 KS	180	case 'S':
56b13bcc TG	181	r = udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
	182	if (r < 0) {
	183	log_error_errno(r, "could not add negative subsystem match '%s': %m", optarg);
	184	return 2;
	185	}
912541b0 KS	186	break;
	187	case 'a':
	188	key = keyval(optarg, &val, buf, sizeof(buf));
56b13bcc TG	189	r = udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
	190	if (r < 0) {
	191	log_error_errno(r, "could not add sysattr match '%s=%s': %m", key, val);
	192	return 2;
	193	}
912541b0 KS	194	break;
	195	case 'A':
	196	key = keyval(optarg, &val, buf, sizeof(buf));
56b13bcc TG	197	r = udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
	198	if (r < 0) {
	199	log_error_errno(r, "could not add negative sysattr match '%s=%s': %m", key, val);
	200	return 2;
	201	}
912541b0 KS	202	break;
	203	case 'p':
	204	key = keyval(optarg, &val, buf, sizeof(buf));
56b13bcc TG	205	r = udev_enumerate_add_match_property(udev_enumerate, key, val);
	206	if (r < 0) {
	207	log_error_errno(r, "could not add property match '%s=%s': %m", key, val);
	208	return 2;
	209	}
912541b0 KS	210	break;
912541b0 KS	211	case 'g':
56b13bcc TG	212	r = udev_enumerate_add_match_tag(udev_enumerate, optarg);
	213	if (r < 0) {
	214	log_error_errno(r, "could not add tag match '%s': %m", optarg);
	215	return 2;
	216	}
912541b0 KS	217	break;
912541b0 KS	218	case 'y':
56b13bcc TG	219	r = udev_enumerate_add_match_sysname(udev_enumerate, optarg);
	220	if (r < 0) {
	221	log_error_errno(r, "could not add sysname match '%s': %m", optarg);
	222	return 2;
	223	}
912541b0 KS	224	break;
912541b0 KS	225	case 'b': {
d6170d27 ZJS	226	_cleanup_udev_device_unref_ struct udev_device *dev;
	227
	228	dev = find_device(udev, optarg, "/sys");
912541b0	229	if (dev == NULL) {
9f6445e3	230	log_error("unable to open the device '%s'", optarg);
44433ebd	231	return 2;
912541b0	232	}
d6170d27	233
56b13bcc TG	234	r = udev_enumerate_add_match_parent(udev_enumerate, dev);
	235	if (r < 0) {
	236	log_error_errno(r, "could not add parent match '%s': %m", optarg);
	237	return 2;
	238	}
912541b0 KS	239	break;
912541b0 KS	240	}
792cc203 MH	241	case 'w':
	242	settle = true;
	243	break;
d6170d27	244
80877656 ZJS	245	case ARG_NAME: {
	246	_cleanup_udev_device_unref_ struct udev_device *dev;
	247
	248	dev = find_device(udev, optarg, "/dev/");
	249	if (dev == NULL) {
	250	log_error("unable to open the device '%s'", optarg);
	251	return 2;
	252	}
	253
56b13bcc TG	254	r = udev_enumerate_add_match_parent(udev_enumerate, dev);
	255	if (r < 0) {
	256	log_error_errno(r, "could not add parent match '%s': %m", optarg);
	257	return 2;
	258	}
80877656 ZJS	259	break;
	260	}
	261
5639df9a YW	262	case 'V':
	263	print_version();
	264	return 0;
912541b0	265	case 'h':
7643ac9a	266	help();
44433ebd	267	return 0;
7643ac9a	268	case '?':
44433ebd	269	return 1;
7643ac9a ZJS	270	default:
7643ac9a ZJS	271	assert_not_reached("Unknown option");
912541b0 KS	272	}
	273	}
	274
80877656 ZJS	275	for (; optind < argc; optind++) {
	276	_cleanup_udev_device_unref_ struct udev_device *dev;
	277
	278	dev = find_device(udev, argv[optind], NULL);
	279	if (dev == NULL) {
	280	log_error("unable to open the device '%s'", argv[optind]);
	281	return 2;
	282	}
	283
56b13bcc TG	284	r = udev_enumerate_add_match_parent(udev_enumerate, dev);
	285	if (r < 0) {
	286	log_error_errno(r, "could not add tag match '%s': %m", optarg);
	287	return 2;
	288	}
7643ac9a ZJS	289	}
7643ac9a ZJS	290
792cc203 MH	291	if (settle) {
	292	fd_ep = epoll_create1(EPOLL_CLOEXEC);
	293	if (fd_ep < 0) {
	294	log_error_errno(errno, "error creating epoll fd: %m");
	295	return 1;
	296	}
	297
	298	udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
	299	if (udev_monitor == NULL) {
	300	log_error("error: unable to create netlink socket");
	301	return 3;
	302	}
	303	fd_udev = udev_monitor_get_fd(udev_monitor);
	304
	305	if (udev_monitor_enable_receiving(udev_monitor) < 0) {
	306	log_error("error: unable to subscribe to udev events");
	307	return 4;
	308	}
	309
	310	ep_udev = (struct epoll_event) { .events = EPOLLIN, .data.fd = fd_udev };
	311	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
	312	log_error_errno(errno, "fail to add fd to epoll: %m");
	313	return 5;
	314	}
	315
	316	settle_set = set_new(&string_hash_ops);
	317	if (settle_set == NULL) {
	318	log_oom();
	319	return 1;
	320	}
	321	}
	322
912541b0 KS	323	switch (device_type) {
	324	case TYPE_SUBSYSTEMS:
	325	udev_enumerate_scan_subsystems(udev_enumerate);
792cc203	326	break;
912541b0 KS	327	case TYPE_DEVICES:
912541b0 KS	328	udev_enumerate_scan_devices(udev_enumerate);
792cc203	329	break;
912541b0	330	default:
4dd1de72	331	assert_not_reached("device_type");
912541b0	332	}
792cc203 MH	333	exec_list(udev_enumerate, action, settle_set);
	334
	335	while (!set_isempty(settle_set)) {
	336	int fdcount;
	337	struct epoll_event ev[4];
	338	int i;
	339
	340	fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
	341	if (fdcount < 0) {
	342	if (errno != EINTR)
	343	log_error_errno(errno, "error receiving uevent message: %m");
	344	continue;
	345	}
	346
	347	for (i = 0; i < fdcount; i++) {
	348	if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
	349	_cleanup_udev_device_unref_ struct udev_device *device;
	350	const char *syspath = NULL;
	351
	352	device = udev_monitor_receive_device(udev_monitor);
	353	if (device == NULL)
	354	continue;
	355
	356	syspath = udev_device_get_syspath(device);
	357	if (verbose)
	358	printf("settle %s\n", syspath);
	359	if (!set_remove(settle_set, syspath))
	360	log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
	361	}
	362	}
	363	}
	364
	365	return 0;
0d5be398	366	}
1985c76e KS	367
1985c76e KS	368	const struct udevadm_cmd udevadm_trigger = {
912541b0 KS	369	.name = "trigger",
912541b0 KS	370	.cmd = adm_trigger,
5ac0162c	371	.help = "Request events from the kernel",
1985c76e	372	};