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

/*
 * Copyright (C) 2004-2010 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <time.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/epoll.h>
#include <linux/types.h>
#include <linux/netlink.h>

#include "udev.h"
#include "udev-util.h"

static bool udev_exit;

static void sig_handler(int signum) {
        if (signum == SIGINT || signum == SIGTERM)
                udev_exit = true;
}

static void print_device(struct udev_device *device, const char *source, int prop) {
        struct timespec ts;

        clock_gettime(CLOCK_MONOTONIC, &ts);
        printf("%-6s[%"PRI_TIME".%06ld] %-8s %s (%s)\n",
               source,
               ts.tv_sec, ts.tv_nsec/1000,
               udev_device_get_action(device),
               udev_device_get_devpath(device),
               udev_device_get_subsystem(device));
        if (prop) {
                struct udev_list_entry *list_entry;

                udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
                        printf("%s=%s\n",
                               udev_list_entry_get_name(list_entry),
                               udev_list_entry_get_value(list_entry));
                printf("\n");
        }
}

static void help(void) {
        printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
               "  -p,--property                            print the event properties\n"
               "  -k,--kernel                              print kernel uevents\n"
               "  -u,--udev                                print udev events\n"
               "  -s,--subsystem-match=SUBSYSTEM[/DEVTYPE] filter events by subsystem\n"
               "  -t,--tag-match=TAG                       filter events by tag\n"
               "  -h,--help\n\n");
}

static int adm_monitor(struct udev *udev, int argc, char *argv[]) {
        struct sigaction act = {};
        sigset_t mask;
        bool prop = false;
        bool print_kernel = false;
        bool print_udev = false;
        _cleanup_udev_list_cleanup_ struct udev_list subsystem_match_list;
        _cleanup_udev_list_cleanup_ struct udev_list tag_match_list;
        _cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL;
        _cleanup_udev_monitor_unref_ struct udev_monitor *kernel_monitor = NULL;
        _cleanup_close_ int fd_ep = -1;
        int fd_kernel = -1, fd_udev = -1;
        struct epoll_event ep_kernel, ep_udev;
        int c;

        static const struct option options[] = {
                { "property",        no_argument,       NULL, 'p' },
                { "environment",     no_argument,       NULL, 'e' }, /* alias for -p */
                { "kernel",          no_argument,       NULL, 'k' },
                { "udev",            no_argument,       NULL, 'u' },
                { "subsystem-match", required_argument, NULL, 's' },
                { "tag-match",       required_argument, NULL, 't' },
                { "help",            no_argument,       NULL, 'h' },
                {}
        };

        udev_list_init(udev, &subsystem_match_list, true);
        udev_list_init(udev, &tag_match_list, true);

        while((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0)
                switch (c) {
                case 'p':
                case 'e':
                        prop = true;
                        break;
                case 'k':
                        print_kernel = true;
                        break;
                case 'u':
                        print_udev = true;
                        break;
                case 's':
                        {
                                char subsys[UTIL_NAME_SIZE];
                                char *devtype;

                                strscpy(subsys, sizeof(subsys), optarg);
                                devtype = strchr(subsys, '/');
                                if (devtype != NULL) {
                                        devtype[0] = '\0';
                                        devtype++;
                                }
                                udev_list_entry_add(&subsystem_match_list, subsys, devtype);
                                break;
                        }
                case 't':
                        udev_list_entry_add(&tag_match_list, optarg, NULL);
                        break;
                case 'h':
                        help();
                        return 0;
                default:
                        return 1;
                }

        if (!print_kernel && !print_udev) {
                print_kernel = true;
                print_udev = true;
        }

        /* set signal handlers */
        act.sa_handler = sig_handler;
        act.sa_flags = SA_RESTART;
        sigaction(SIGINT, &act, NULL);
        sigaction(SIGTERM, &act, NULL);
        sigemptyset(&mask);
        sigaddset(&mask, SIGINT);
        sigaddset(&mask, SIGTERM);
        sigprocmask(SIG_UNBLOCK, &mask, NULL);

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

        printf("monitor will print the received events for:\n");
        if (print_udev) {
                struct udev_list_entry *entry;

                udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
                if (udev_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        return 1;
                }
                udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
                fd_udev = udev_monitor_get_fd(udev_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);
                        const char *devtype = udev_list_entry_get_value(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
                        const char *tag = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
                                fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
                }

                if (udev_monitor_enable_receiving(udev_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to udev events\n");
                        return 2;
                }

                memzero(&ep_udev, sizeof(struct epoll_event));
                ep_udev.events = EPOLLIN;
                ep_udev.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 2;
                }

                printf("UDEV - the event which udev sends out after rule processing\n");
        }

        if (print_kernel) {
                struct udev_list_entry *entry;

                kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
                if (kernel_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        return 3;
                }
                udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
                fd_kernel = udev_monitor_get_fd(kernel_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to kernel events\n");
                        return 4;
                }

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

                printf("KERNEL - the kernel uevent\n");
        }
        printf("\n");

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

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

                for (i = 0; i < fdcount; i++) {
                        if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(kernel_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "KERNEL", prop);
                                udev_device_unref(device);
                        } else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(udev_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "UDEV", prop);
                                udev_device_unref(device);
                        }
                }
        }

        return 0;
}

const struct udevadm_cmd udevadm_monitor = {
        .name = "monitor",
        .cmd = adm_monitor,
        .help = "listen to kernel and udev events",
};
Commit	Line	Data
1bc33626	1	/*
1298001e	2	* Copyright (C) 2004-2010 Kay Sievers <kay@vrfy.org>
1bc33626	3	*
55e9959b KS	4	* This program is free software: you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
1bc33626	8	*
55e9959b KS	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
1bc33626 KS	16	*/
	17
	18	#include <unistd.h>
	19	#include <stdio.h>
	20	#include <stdlib.h>
9571122e	21	#include <stddef.h>
1bc33626 KS	22	#include <string.h>
1bc33626 KS	23	#include <fcntl.h>
1bc33626	24	#include <errno.h>
9ae611be	25	#include <signal.h>
0d2516c3	26	#include <getopt.h>
2315e570	27	#include <time.h>
38ff77b8	28	#include <sys/time.h>
1bc33626 KS	29	#include <sys/socket.h>
1bc33626 KS	30	#include <sys/un.h>
578cd510	31	#include <sys/epoll.h>
62821d0d	32	#include <linux/types.h>
1bc33626	33	#include <linux/netlink.h>
1bc33626 KS	34
1bc33626 KS	35	#include "udev.h"
44433ebd	36	#include "udev-util.h"
1bc33626	37
578cd510	38	static bool udev_exit;
1bc33626	39
9ec6e95b	40	static void sig_handler(int signum) {
912541b0 KS	41	if (signum == SIGINT \|\| signum == SIGTERM)
912541b0 KS	42	udev_exit = true;
9ae611be KS	43	}
9ae611be KS	44
9ec6e95b	45	static void print_device(struct udev_device device, const char source, int prop) {
912541b0 KS	46	struct timespec ts;
	47
	48	clock_gettime(CLOCK_MONOTONIC, &ts);
de0671ee	49	printf("%-6s[%"PRI_TIME".%06ld] %-8s %s (%s)\n",
912541b0	50	source,
de0671ee	51	ts.tv_sec, ts.tv_nsec/1000,
912541b0 KS	52	udev_device_get_action(device),
	53	udev_device_get_devpath(device),
	54	udev_device_get_subsystem(device));
	55	if (prop) {
	56	struct udev_list_entry *list_entry;
	57
	58	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
	59	printf("%s=%s\n",
	60	udev_list_entry_get_name(list_entry),
	61	udev_list_entry_get_value(list_entry));
	62	printf("\n");
	63	}
0de33a61 KS	64	}
0de33a61 KS	65
7643ac9a ZJS	66	static void help(void) {
	67	printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
	68	" -p,--property print the event properties\n"
	69	" -k,--kernel print kernel uevents\n"
	70	" -u,--udev print udev events\n"
	71	" -s,--subsystem-match=SUBSYSTEM[/DEVTYPE] filter events by subsystem\n"
	72	" -t,--tag-match=TAG filter events by tag\n"
	73	" -h,--help\n\n");
	74	}
	75
9ec6e95b	76	static int adm_monitor(struct udev udev, int argc, char argv[]) {
9d458c09	77	struct sigaction act = {};
912541b0	78	sigset_t mask;
912541b0 KS	79	bool prop = false;
	80	bool print_kernel = false;
	81	bool print_udev = false;
44433ebd ZJS	82	_cleanup_udev_list_cleanup_ struct udev_list subsystem_match_list;
	83	_cleanup_udev_list_cleanup_ struct udev_list tag_match_list;
	84	_cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL;
	85	_cleanup_udev_monitor_unref_ struct udev_monitor *kernel_monitor = NULL;
	86	_cleanup_close_ int fd_ep = -1;
912541b0 KS	87	int fd_kernel = -1, fd_udev = -1;
912541b0 KS	88	struct epoll_event ep_kernel, ep_udev;
44433ebd	89	int c;
912541b0 KS	90
912541b0 KS	91	static const struct option options[] = {
7643ac9a ZJS	92	{ "property", no_argument, NULL, 'p' },
	93	{ "environment", no_argument, NULL, 'e' }, /* alias for -p */
	94	{ "kernel", no_argument, NULL, 'k' },
	95	{ "udev", no_argument, NULL, 'u' },
912541b0	96	{ "subsystem-match", required_argument, NULL, 's' },
7643ac9a ZJS	97	{ "tag-match", required_argument, NULL, 't' },
7643ac9a ZJS	98	{ "help", no_argument, NULL, 'h' },
912541b0 KS	99	{}
	100	};
	101
	102	udev_list_init(udev, &subsystem_match_list, true);
	103	udev_list_init(udev, &tag_match_list, true);
	104
7643ac9a ZJS	105	while((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0)
7643ac9a ZJS	106	switch (c) {
912541b0 KS	107	case 'p':
	108	case 'e':
	109	prop = true;
	110	break;
	111	case 'k':
	112	print_kernel = true;
	113	break;
	114	case 'u':
	115	print_udev = true;
	116	break;
	117	case 's':
	118	{
	119	char subsys[UTIL_NAME_SIZE];
	120	char *devtype;
	121
d5a89d7d	122	strscpy(subsys, sizeof(subsys), optarg);
912541b0 KS	123	devtype = strchr(subsys, '/');
	124	if (devtype != NULL) {
	125	devtype[0] = '\0';
	126	devtype++;
	127	}
	128	udev_list_entry_add(&subsystem_match_list, subsys, devtype);
	129	break;
	130	}
	131	case 't':
	132	udev_list_entry_add(&tag_match_list, optarg, NULL);
	133	break;
	134	case 'h':
7643ac9a	135	help();
44433ebd	136	return 0;
912541b0	137	default:
44433ebd	138	return 1;
912541b0	139	}
912541b0 KS	140
	141	if (!print_kernel && !print_udev) {
	142	print_kernel = true;
	143	print_udev = true;
	144	}
	145
	146	/* set signal handlers */
912541b0	147	act.sa_handler = sig_handler;
912541b0 KS	148	act.sa_flags = SA_RESTART;
	149	sigaction(SIGINT, &act, NULL);
	150	sigaction(SIGTERM, &act, NULL);
	151	sigemptyset(&mask);
	152	sigaddset(&mask, SIGINT);
	153	sigaddset(&mask, SIGTERM);
	154	sigprocmask(SIG_UNBLOCK, &mask, NULL);
	155
	156	fd_ep = epoll_create1(EPOLL_CLOEXEC);
	157	if (fd_ep < 0) {
56f64d95	158	log_error_errno(errno, "error creating epoll fd: %m");
44433ebd	159	return 1;
912541b0 KS	160	}
	161
	162	printf("monitor will print the received events for:\n");
	163	if (print_udev) {
	164	struct udev_list_entry *entry;
	165
	166	udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
	167	if (udev_monitor == NULL) {
	168	fprintf(stderr, "error: unable to create netlink socket\n");
44433ebd	169	return 1;
912541b0 KS	170	}
	171	udev_monitor_set_receive_buffer_size(udev_monitor, 12810241024);
	172	fd_udev = udev_monitor_get_fd(udev_monitor);
	173
	174	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	175	const char *subsys = udev_list_entry_get_name(entry);
	176	const char *devtype = udev_list_entry_get_value(entry);
	177
	178	if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
	179	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	180	}
	181
	182	udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
	183	const char *tag = udev_list_entry_get_name(entry);
	184
	185	if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
	186	fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
	187	}
	188
	189	if (udev_monitor_enable_receiving(udev_monitor) < 0) {
	190	fprintf(stderr, "error: unable to subscribe to udev events\n");
44433ebd	191	return 2;
912541b0 KS	192	}
912541b0 KS	193
29804cc1	194	memzero(&ep_udev, sizeof(struct epoll_event));
912541b0 KS	195	ep_udev.events = EPOLLIN;
	196	ep_udev.data.fd = fd_udev;
	197	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
56f64d95	198	log_error_errno(errno, "fail to add fd to epoll: %m");
44433ebd	199	return 2;
912541b0 KS	200	}
	201
	202	printf("UDEV - the event which udev sends out after rule processing\n");
	203	}
	204
	205	if (print_kernel) {
	206	struct udev_list_entry *entry;
	207
	208	kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
	209	if (kernel_monitor == NULL) {
	210	fprintf(stderr, "error: unable to create netlink socket\n");
44433ebd	211	return 3;
912541b0 KS	212	}
	213	udev_monitor_set_receive_buffer_size(kernel_monitor, 12810241024);
	214	fd_kernel = udev_monitor_get_fd(kernel_monitor);
	215
	216	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	217	const char *subsys = udev_list_entry_get_name(entry);
	218
	219	if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
	220	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	221	}
	222
	223	if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
	224	fprintf(stderr, "error: unable to subscribe to kernel events\n");
44433ebd	225	return 4;
912541b0 KS	226	}
912541b0 KS	227
29804cc1	228	memzero(&ep_kernel, sizeof(struct epoll_event));
912541b0 KS	229	ep_kernel.events = EPOLLIN;
	230	ep_kernel.data.fd = fd_kernel;
	231	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
56f64d95	232	log_error_errno(errno, "fail to add fd to epoll: %m");
44433ebd	233	return 5;
912541b0 KS	234	}
	235
	236	printf("KERNEL - the kernel uevent\n");
	237	}
	238	printf("\n");
	239
	240	while (!udev_exit) {
	241	int fdcount;
	242	struct epoll_event ev[4];
	243	int i;
	244
8fef0ff2	245	fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
912541b0 KS	246	if (fdcount < 0) {
	247	if (errno != EINTR)
	248	fprintf(stderr, "error receiving uevent message: %m\n");
	249	continue;
	250	}
	251
	252	for (i = 0; i < fdcount; i++) {
	253	if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
	254	struct udev_device *device;
	255
	256	device = udev_monitor_receive_device(kernel_monitor);
	257	if (device == NULL)
	258	continue;
	259	print_device(device, "KERNEL", prop);
	260	udev_device_unref(device);
	261	} else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
	262	struct udev_device *device;
	263
	264	device = udev_monitor_receive_device(udev_monitor);
	265	if (device == NULL)
	266	continue;
	267	print_device(device, "UDEV", prop);
	268	udev_device_unref(device);
	269	}
	270	}
	271	}
44433ebd ZJS	272
44433ebd ZJS	273	return 0;
1bc33626	274	}
1985c76e KS	275
1985c76e KS	276	const struct udevadm_cmd udevadm_monitor = {
912541b0 KS	277	.name = "monitor",
	278	.cmd = adm_monitor,
	279	.help = "listen to kernel and udev events",
1985c76e	280	};