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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <limits.h> | |
23 | #include <stdio.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <getopt.h> | |
27 | #include <string.h> | |
28 | ||
29 | #include "cgroup-show.h" | |
30 | #include "cgroup-util.h" | |
31 | #include "log.h" | |
32 | #include "path-util.h" | |
33 | #include "util.h" | |
34 | #include "pager.h" | |
35 | #include "build.h" | |
36 | #include "output-mode.h" | |
37 | #include "fileio.h" | |
38 | #include "sd-bus.h" | |
39 | #include "bus-util.h" | |
40 | #include "bus-error.h" | |
41 | #include "unit-name.h" | |
42 | ||
43 | static bool arg_no_pager = false; | |
44 | static bool arg_kernel_threads = false; | |
45 | static bool arg_all = false; | |
46 | static int arg_full = -1; | |
47 | static char* arg_machine = NULL; | |
48 | ||
49 | static void help(void) { | |
50 | printf("%s [OPTIONS...] [CGROUP...]\n\n" | |
51 | "Recursively show control group contents.\n\n" | |
52 | " -h --help Show this help\n" | |
53 | " --version Show package version\n" | |
54 | " --no-pager Do not pipe output into a pager\n" | |
55 | " -a --all Show all groups, including empty\n" | |
56 | " -l --full Do not ellipsize output\n" | |
57 | " -k Include kernel threads in output\n" | |
58 | " -M --machine Show container\n" | |
59 | , program_invocation_short_name); | |
60 | } | |
61 | ||
62 | static int parse_argv(int argc, char *argv[]) { | |
63 | ||
64 | enum { | |
65 | ARG_NO_PAGER = 0x100, | |
66 | ARG_VERSION, | |
67 | }; | |
68 | ||
69 | static const struct option options[] = { | |
70 | { "help", no_argument, NULL, 'h' }, | |
71 | { "version", no_argument, NULL, ARG_VERSION }, | |
72 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
73 | { "all", no_argument, NULL, 'a' }, | |
74 | { "full", no_argument, NULL, 'l' }, | |
75 | { "machine", required_argument, NULL, 'M' }, | |
76 | {} | |
77 | }; | |
78 | ||
79 | int c; | |
80 | ||
81 | assert(argc >= 1); | |
82 | assert(argv); | |
83 | ||
84 | while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0) | |
85 | ||
86 | switch (c) { | |
87 | ||
88 | case 'h': | |
89 | help(); | |
90 | return 0; | |
91 | ||
92 | case ARG_VERSION: | |
93 | puts(PACKAGE_STRING); | |
94 | puts(SYSTEMD_FEATURES); | |
95 | return 0; | |
96 | ||
97 | case ARG_NO_PAGER: | |
98 | arg_no_pager = true; | |
99 | break; | |
100 | ||
101 | case 'a': | |
102 | arg_all = true; | |
103 | break; | |
104 | ||
105 | case 'l': | |
106 | arg_full = true; | |
107 | break; | |
108 | ||
109 | case 'k': | |
110 | arg_kernel_threads = true; | |
111 | break; | |
112 | ||
113 | case 'M': | |
114 | arg_machine = optarg; | |
115 | break; | |
116 | ||
117 | case '?': | |
118 | return -EINVAL; | |
119 | ||
120 | default: | |
121 | assert_not_reached("Unhandled option"); | |
122 | } | |
123 | ||
124 | return 1; | |
125 | } | |
126 | ||
127 | int main(int argc, char *argv[]) { | |
128 | int r = 0, retval = EXIT_FAILURE; | |
129 | int output_flags; | |
130 | _cleanup_free_ char *root = NULL; | |
131 | _cleanup_bus_close_unref_ sd_bus *bus = NULL; | |
132 | ||
133 | log_parse_environment(); | |
134 | log_open(); | |
135 | ||
136 | r = parse_argv(argc, argv); | |
137 | if (r < 0) | |
138 | goto finish; | |
139 | else if (r == 0) { | |
140 | retval = EXIT_SUCCESS; | |
141 | goto finish; | |
142 | } | |
143 | ||
144 | if (!arg_no_pager) { | |
145 | r = pager_open(false); | |
146 | if (r > 0) { | |
147 | if (arg_full == -1) | |
148 | arg_full = true; | |
149 | } | |
150 | } | |
151 | ||
152 | output_flags = | |
153 | arg_all * OUTPUT_SHOW_ALL | | |
154 | (arg_full > 0) * OUTPUT_FULL_WIDTH; | |
155 | ||
156 | r = bus_open_transport(BUS_TRANSPORT_LOCAL, NULL, false, &bus); | |
157 | if (r < 0) { | |
158 | log_error_errno(r, "Failed to create bus connection: %m"); | |
159 | goto finish; | |
160 | } | |
161 | ||
162 | if (optind < argc) { | |
163 | int i; | |
164 | ||
165 | for (i = optind; i < argc; i++) { | |
166 | int q; | |
167 | ||
168 | fprintf(stdout, "%s:\n", argv[i]); | |
169 | fflush(stdout); | |
170 | ||
171 | if (arg_machine) | |
172 | root = strjoin("machine/", arg_machine, "/", argv[i], NULL); | |
173 | else | |
174 | root = strdup(argv[i]); | |
175 | if (!root) | |
176 | return log_oom(); | |
177 | ||
178 | q = show_cgroup_by_path(root, NULL, 0, | |
179 | arg_kernel_threads, output_flags); | |
180 | if (q < 0) | |
181 | r = q; | |
182 | } | |
183 | ||
184 | } else { | |
185 | _cleanup_free_ char *p; | |
186 | ||
187 | p = get_current_dir_name(); | |
188 | if (!p) { | |
189 | log_error_errno(errno, "Cannot determine current working directory: %m"); | |
190 | goto finish; | |
191 | } | |
192 | ||
193 | if (path_startswith(p, "/sys/fs/cgroup") && !arg_machine) { | |
194 | printf("Working Directory %s:\n", p); | |
195 | r = show_cgroup_by_path(p, NULL, 0, | |
196 | arg_kernel_threads, output_flags); | |
197 | } else { | |
198 | if (arg_machine) { | |
199 | char *m; | |
200 | const char *cgroup; | |
201 | _cleanup_free_ char *scope = NULL; | |
202 | _cleanup_free_ char *path = NULL; | |
203 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
204 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
205 | ||
206 | m = strjoina("/run/systemd/machines/", arg_machine); | |
207 | r = parse_env_file(m, NEWLINE, "SCOPE", &scope, NULL); | |
208 | if (r < 0) { | |
209 | log_error_errno(r, "Failed to get machine path: %m"); | |
210 | goto finish; | |
211 | } | |
212 | ||
213 | path = unit_dbus_path_from_name(scope); | |
214 | if (!path) { | |
215 | log_oom(); | |
216 | goto finish; | |
217 | } | |
218 | ||
219 | r = sd_bus_get_property( | |
220 | bus, | |
221 | "org.freedesktop.systemd1", | |
222 | path, | |
223 | "org.freedesktop.systemd1.Scope", | |
224 | "ControlGroup", | |
225 | &error, | |
226 | &reply, | |
227 | "s"); | |
228 | ||
229 | if (r < 0) { | |
230 | log_error("Failed to query ControlGroup: %s", bus_error_message(&error, -r)); | |
231 | goto finish; | |
232 | } | |
233 | ||
234 | r = sd_bus_message_read(reply, "s", &cgroup); | |
235 | if (r < 0) { | |
236 | bus_log_parse_error(r); | |
237 | goto finish; | |
238 | } | |
239 | ||
240 | root = strdup(cgroup); | |
241 | if (!root) { | |
242 | log_oom(); | |
243 | goto finish; | |
244 | } | |
245 | ||
246 | } else | |
247 | r = cg_get_root_path(&root); | |
248 | if (r < 0) { | |
249 | log_error_errno(r, "Failed to get %s path: %m", | |
250 | arg_machine ? "machine" : "root"); | |
251 | goto finish; | |
252 | } | |
253 | ||
254 | r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, | |
255 | arg_kernel_threads, output_flags); | |
256 | } | |
257 | } | |
258 | ||
259 | if (r < 0) { | |
260 | log_error_errno(r, "Failed to list cgroup tree %s: %m", root); | |
261 | retval = EXIT_FAILURE; | |
262 | } else | |
263 | retval = EXIT_SUCCESS; | |
264 | ||
265 | finish: | |
266 | pager_close(); | |
267 | ||
268 | return retval; | |
269 | } |