1 /* SPDX-License-Identifier: GPL-2.0+ */
9 #include "device-enumerator-private.h"
12 #include "path-util.h"
14 #include "string-util.h"
17 #include "udevadm-util.h"
19 static bool arg_verbose
= false;
20 static bool arg_dry_run
= false;
22 static int exec_list(sd_device_enumerator
*e
, const char *action
, Set
*settle_set
) {
26 FOREACH_DEVICE_AND_SUBSYSTEM(e
, d
) {
27 _cleanup_free_
char *filename
= NULL
;
30 if (sd_device_get_syspath(d
, &syspath
) < 0)
34 printf("%s\n", syspath
);
38 filename
= path_join(syspath
, "uevent");
42 r
= write_string_file(filename
, action
, WRITE_STRING_FILE_DISABLE_BUFFER
);
44 log_debug_errno(r
, "Failed to write '%s' to '%s', ignoring: %m", action
, filename
);
49 r
= set_put_strdup(settle_set
, syspath
);
58 static int device_monitor_handler(sd_device_monitor
*m
, sd_device
*dev
, void *userdata
) {
59 Set
*settle_set
= userdata
;
65 if (sd_device_get_syspath(dev
, &syspath
) < 0)
69 printf("settle %s\n", syspath
);
71 if (!set_remove(settle_set
, syspath
))
72 log_debug("Got epoll event on syspath %s not present in syspath set", syspath
);
74 if (set_isempty(settle_set
))
75 return sd_event_exit(sd_device_monitor_get_event(m
), 0);
80 static char* keyval(const char *str
, const char **key
, const char **val
) {
87 pos
= strchr(buf
, '=');
99 static int help(void) {
100 printf("%s trigger [OPTIONS] DEVPATH\n\n"
101 "Request events from the kernel.\n\n"
102 " -h --help Show this help\n"
103 " -V --version Show package version\n"
104 " -v --verbose Print the list of devices while running\n"
105 " -n --dry-run Do not actually trigger the events\n"
106 " -t --type= Type of events to trigger\n"
107 " devices sysfs devices (default)\n"
108 " subsystems sysfs subsystems and drivers\n"
109 " -c --action=ACTION Event action value, default is \"change\"\n"
110 " -s --subsystem-match=SUBSYSTEM Trigger devices from a matching subsystem\n"
111 " -S --subsystem-nomatch=SUBSYSTEM Exclude devices from a matching subsystem\n"
112 " -a --attr-match=FILE[=VALUE] Trigger devices with a matching attribute\n"
113 " -A --attr-nomatch=FILE[=VALUE] Exclude devices with a matching attribute\n"
114 " -p --property-match=KEY=VALUE Trigger devices with a matching property\n"
115 " -g --tag-match=KEY=VALUE Trigger devices with a matching property\n"
116 " -y --sysname-match=NAME Trigger devices with this /sys path\n"
117 " --name-match=NAME Trigger devices with this /dev name\n"
118 " -b --parent-match=NAME Trigger devices with that parent device\n"
119 " -w --settle Wait for the triggered events to complete\n"
120 , program_invocation_short_name
);
125 int trigger_main(int argc
, char *argv
[], void *userdata
) {
130 static const struct option options
[] = {
131 { "verbose", no_argument
, NULL
, 'v' },
132 { "dry-run", no_argument
, NULL
, 'n' },
133 { "type", required_argument
, NULL
, 't' },
134 { "action", required_argument
, NULL
, 'c' },
135 { "subsystem-match", required_argument
, NULL
, 's' },
136 { "subsystem-nomatch", required_argument
, NULL
, 'S' },
137 { "attr-match", required_argument
, NULL
, 'a' },
138 { "attr-nomatch", required_argument
, NULL
, 'A' },
139 { "property-match", required_argument
, NULL
, 'p' },
140 { "tag-match", required_argument
, NULL
, 'g' },
141 { "sysname-match", required_argument
, NULL
, 'y' },
142 { "name-match", required_argument
, NULL
, ARG_NAME
},
143 { "parent-match", required_argument
, NULL
, 'b' },
144 { "settle", no_argument
, NULL
, 'w' },
145 { "version", no_argument
, NULL
, 'V' },
146 { "help", no_argument
, NULL
, 'h' },
152 } device_type
= TYPE_DEVICES
;
153 const char *action
= "change";
154 _cleanup_(sd_device_enumerator_unrefp
) sd_device_enumerator
*e
= NULL
;
155 _cleanup_(sd_device_monitor_unrefp
) sd_device_monitor
*m
= NULL
;
156 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
157 _cleanup_set_free_free_ Set
*settle_set
= NULL
;
161 r
= sd_device_enumerator_new(&e
);
165 r
= sd_device_enumerator_allow_uninitialized(e
);
169 while ((c
= getopt_long(argc
, argv
, "vnt:c:s:S:a:A:p:g:y:b:wVh", options
, NULL
)) >= 0) {
170 _cleanup_free_
char *buf
= NULL
;
171 const char *key
, *val
;
181 if (streq(optarg
, "devices"))
182 device_type
= TYPE_DEVICES
;
183 else if (streq(optarg
, "subsystems"))
184 device_type
= TYPE_SUBSYSTEMS
;
186 log_error("Unknown type --type=%s", optarg
);
191 if (STR_IN_SET(optarg
, "add", "remove", "change"))
194 log_error("Unknown action '%s'", optarg
);
200 r
= sd_device_enumerator_add_match_subsystem(e
, optarg
, true);
202 return log_error_errno(r
, "Failed to add subsystem match '%s': %m", optarg
);
205 r
= sd_device_enumerator_add_match_subsystem(e
, optarg
, false);
207 return log_error_errno(r
, "Failed to add negative subsystem match '%s': %m", optarg
);
210 buf
= keyval(optarg
, &key
, &val
);
213 r
= sd_device_enumerator_add_match_sysattr(e
, key
, val
, true);
215 return log_error_errno(r
, "Failed to add sysattr match '%s=%s': %m", key
, val
);
218 buf
= keyval(optarg
, &key
, &val
);
221 r
= sd_device_enumerator_add_match_sysattr(e
, key
, val
, false);
223 return log_error_errno(r
, "Failed to add negative sysattr match '%s=%s': %m", key
, val
);
226 buf
= keyval(optarg
, &key
, &val
);
229 r
= sd_device_enumerator_add_match_property(e
, key
, val
);
231 return log_error_errno(r
, "Failed to add property match '%s=%s': %m", key
, val
);
234 r
= sd_device_enumerator_add_match_tag(e
, optarg
);
236 return log_error_errno(r
, "Failed to add tag match '%s': %m", optarg
);
239 r
= sd_device_enumerator_add_match_sysname(e
, optarg
);
241 return log_error_errno(r
, "Failed to add sysname match '%s': %m", optarg
);
244 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
246 r
= find_device(optarg
, "/sys", &dev
);
248 return log_error_errno(r
, "Failed to open the device '%s': %m", optarg
);
250 r
= sd_device_enumerator_add_match_parent(e
, dev
);
252 return log_error_errno(r
, "Failed to add parent match '%s': %m", optarg
);
260 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
262 r
= find_device(optarg
, "/dev/", &dev
);
264 return log_error_errno(r
, "Failed to open the device '%s': %m", optarg
);
266 r
= sd_device_enumerator_add_match_parent(e
, dev
);
268 return log_error_errno(r
, "Failed to add parent match '%s': %m", optarg
);
273 return print_version();
279 assert_not_reached("Unknown option");
283 for (; optind
< argc
; optind
++) {
284 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
286 r
= find_device(argv
[optind
], NULL
, &dev
);
288 return log_error_errno(r
, "Failed to open the device '%s': %m", argv
[optind
]);
290 r
= sd_device_enumerator_add_match_parent(e
, dev
);
292 return log_error_errno(r
, "Failed to add parent match '%s': %m", argv
[optind
]);
296 settle_set
= set_new(&string_hash_ops
);
300 r
= sd_event_default(&event
);
302 return log_error_errno(r
, "Failed to get default event: %m");
304 r
= sd_device_monitor_new(&m
);
306 return log_error_errno(r
, "Failed to create device monitor object: %m");
308 r
= sd_device_monitor_attach_event(m
, event
);
310 return log_error_errno(r
, "Failed to attach event to device monitor: %m");
312 r
= sd_device_monitor_start(m
, device_monitor_handler
, settle_set
);
314 return log_error_errno(r
, "Failed to start device monitor: %m");
317 switch (device_type
) {
318 case TYPE_SUBSYSTEMS
:
319 r
= device_enumerator_scan_subsystems(e
);
321 return log_error_errno(r
, "Failed to scan subsystems: %m");
324 r
= device_enumerator_scan_devices(e
);
326 return log_error_errno(r
, "Failed to scan devices: %m");
329 assert_not_reached("Unknown device type");
331 r
= exec_list(e
, action
, settle_set
);
335 if (event
&& !set_isempty(settle_set
)) {
336 r
= sd_event_loop(event
);
338 return log_error_errno(r
, "Event loop failed: %m");