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e7145211 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
7baada47 | 2 | /* |
fc206fbe | 3 | * Copyright (C) 2006-2009 Kay Sievers <kay@vrfy.org> |
bb38678e SJR |
4 | * Copyright (C) 2009 Canonical Ltd. |
5 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
7baada47 | 6 | * |
55e9959b KS |
7 | * This program is free software: you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 2 of the License, or | |
10 | * (at your option) any later version. | |
7baada47 | 11 | * |
55e9959b KS |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
7baada47 KS |
19 | */ |
20 | ||
7baada47 | 21 | #include <errno.h> |
c2666405 | 22 | #include <getopt.h> |
0a6f50c0 | 23 | #include <poll.h> |
cf0fbc49 TA |
24 | #include <stddef.h> |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <unistd.h> | |
7baada47 | 29 | |
6bedfcbb | 30 | #include "parse-util.h" |
7baada47 | 31 | #include "udev.h" |
5639df9a | 32 | #include "udevadm-util.h" |
4e93793d | 33 | #include "util.h" |
7baada47 | 34 | |
7643ac9a | 35 | static void help(void) { |
5639df9a | 36 | printf("%s settle [OPTIONS]\n\n" |
5ac0162c LP |
37 | "Wait for pending udev events.\n\n" |
38 | " -h --help Show this help\n" | |
5639df9a | 39 | " -V --version Show package version\n" |
5ac0162c LP |
40 | " -t --timeout=SECONDS Maximum time to wait for events\n" |
41 | " -E --exit-if-exists=FILE Stop waiting if file exists\n" | |
42 | , program_invocation_short_name); | |
7643ac9a ZJS |
43 | } |
44 | ||
9ec6e95b | 45 | static int adm_settle(struct udev *udev, int argc, char *argv[]) { |
912541b0 | 46 | static const struct option options[] = { |
7643ac9a | 47 | { "timeout", required_argument, NULL, 't' }, |
912541b0 | 48 | { "exit-if-exists", required_argument, NULL, 'E' }, |
5639df9a | 49 | { "version", no_argument, NULL, 'V' }, |
7643ac9a | 50 | { "help", no_argument, NULL, 'h' }, |
2ac23519 LP |
51 | { "seq-start", required_argument, NULL, 's' }, /* removed */ |
52 | { "seq-end", required_argument, NULL, 'e' }, /* removed */ | |
53 | { "quiet", no_argument, NULL, 'q' }, /* removed */ | |
912541b0 KS |
54 | {} |
55 | }; | |
0736455b | 56 | usec_t deadline; |
912541b0 KS |
57 | const char *exists = NULL; |
58 | unsigned int timeout = 120; | |
b49d9b50 | 59 | struct pollfd pfd[1] = { {.fd = -1}, }; |
14cb7336 KS |
60 | int c; |
61 | struct udev_queue *queue; | |
62 | int rc = EXIT_FAILURE; | |
912541b0 | 63 | |
5639df9a | 64 | while ((c = getopt_long(argc, argv, "t:E:Vhs:e:q", options, NULL)) >= 0) { |
7643ac9a | 65 | switch (c) { |
2ac23519 | 66 | |
4e93793d YZ |
67 | case 't': { |
68 | int r; | |
69 | ||
70 | r = safe_atou(optarg, &timeout); | |
71 | if (r < 0) { | |
e53fc357 LP |
72 | log_error_errno(r, "Invalid timeout value '%s': %m", optarg); |
73 | return EXIT_FAILURE; | |
74 | } | |
912541b0 | 75 | break; |
7643ac9a | 76 | } |
2ac23519 | 77 | |
912541b0 KS |
78 | case 'E': |
79 | exists = optarg; | |
80 | break; | |
2ac23519 | 81 | |
5639df9a YW |
82 | case 'V': |
83 | print_version(); | |
84 | return EXIT_SUCCESS; | |
85 | ||
912541b0 | 86 | case 'h': |
7643ac9a | 87 | help(); |
14cb7336 | 88 | return EXIT_SUCCESS; |
2ac23519 LP |
89 | |
90 | case 's': | |
91 | case 'e': | |
92 | case 'q': | |
93 | log_info("Option -%c no longer supported.", c); | |
94 | return EXIT_FAILURE; | |
95 | ||
7643ac9a | 96 | case '?': |
14cb7336 | 97 | return EXIT_FAILURE; |
2ac23519 | 98 | |
7643ac9a | 99 | default: |
6f285378 | 100 | assert_not_reached("Unknown argument"); |
912541b0 | 101 | } |
9ea28c55 | 102 | } |
7643ac9a ZJS |
103 | |
104 | if (optind < argc) { | |
105 | fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]); | |
14cb7336 | 106 | return EXIT_FAILURE; |
912541b0 KS |
107 | } |
108 | ||
0736455b NS |
109 | deadline = now(CLOCK_MONOTONIC) + timeout * USEC_PER_SEC; |
110 | ||
912541b0 KS |
111 | /* guarantee that the udev daemon isn't pre-processing */ |
112 | if (getuid() == 0) { | |
113 | struct udev_ctrl *uctrl; | |
114 | ||
115 | uctrl = udev_ctrl_new(udev); | |
116 | if (uctrl != NULL) { | |
7375b3c4 | 117 | if (udev_ctrl_send_ping(uctrl, MAX(5U, timeout)) < 0) { |
9f6445e3 | 118 | log_debug("no connection to daemon"); |
912541b0 | 119 | udev_ctrl_unref(uctrl); |
14cb7336 | 120 | return EXIT_SUCCESS; |
912541b0 KS |
121 | } |
122 | udev_ctrl_unref(uctrl); | |
123 | } | |
124 | } | |
125 | ||
14cb7336 KS |
126 | queue = udev_queue_new(udev); |
127 | if (!queue) { | |
128 | log_error("unable to get udev queue"); | |
129 | return EXIT_FAILURE; | |
912541b0 KS |
130 | } |
131 | ||
14cb7336 KS |
132 | pfd[0].events = POLLIN; |
133 | pfd[0].fd = udev_queue_get_fd(queue); | |
134 | if (pfd[0].fd < 0) { | |
135 | log_debug("queue is empty, nothing to watch"); | |
136 | rc = EXIT_SUCCESS; | |
9ea28c55 KS |
137 | goto out; |
138 | } | |
912541b0 | 139 | |
9ea28c55 KS |
140 | for (;;) { |
141 | if (exists && access(exists, F_OK) >= 0) { | |
912541b0 KS |
142 | rc = EXIT_SUCCESS; |
143 | break; | |
144 | } | |
145 | ||
9ea28c55 | 146 | /* exit if queue is empty */ |
14cb7336 | 147 | if (udev_queue_get_queue_is_empty(queue)) { |
9ea28c55 KS |
148 | rc = EXIT_SUCCESS; |
149 | break; | |
912541b0 KS |
150 | } |
151 | ||
bf23b9f8 | 152 | if (now(CLOCK_MONOTONIC) >= deadline) |
0736455b NS |
153 | break; |
154 | ||
14cb7336 | 155 | /* wake up when queue is empty */ |
8a7a0c19 | 156 | if (poll(pfd, 1, MSEC_PER_SEC) > 0 && pfd[0].revents & POLLIN) |
14cb7336 | 157 | udev_queue_flush(queue); |
912541b0 | 158 | } |
9ea28c55 | 159 | |
ff2c503d | 160 | out: |
14cb7336 | 161 | udev_queue_unref(queue); |
912541b0 | 162 | return rc; |
7baada47 | 163 | } |
1985c76e KS |
164 | |
165 | const struct udevadm_cmd udevadm_settle = { | |
912541b0 KS |
166 | .name = "settle", |
167 | .cmd = adm_settle, | |
5ac0162c | 168 | .help = "Wait for pending udev events", |
1985c76e | 169 | }; |