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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 | ||
38 | static bool arg_no_pager = false; | |
39 | static bool arg_kernel_threads = false; | |
40 | static bool arg_all = false; | |
41 | static int arg_full = -1; | |
42 | ||
43 | static void help(void) { | |
44 | ||
45 | printf("%s [OPTIONS...] [CGROUP...]\n\n" | |
46 | "Recursively show control group contents.\n\n" | |
47 | " -h --help Show this help\n" | |
48 | " --version Show package version\n" | |
49 | " --no-pager Do not pipe output into a pager\n" | |
50 | " -a --all Show all groups, including empty\n" | |
51 | " --full Do not ellipsize output\n" | |
52 | " -k Include kernel threads in output\n", | |
53 | program_invocation_short_name); | |
54 | } | |
55 | ||
56 | static int parse_argv(int argc, char *argv[]) { | |
57 | ||
58 | enum { | |
59 | ARG_NO_PAGER = 0x100, | |
60 | ARG_VERSION, | |
61 | ARG_FULL, | |
62 | }; | |
63 | ||
64 | static const struct option options[] = { | |
65 | { "help", no_argument, NULL, 'h' }, | |
66 | { "version", no_argument, NULL, ARG_VERSION }, | |
67 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
68 | { "all", no_argument, NULL, 'a' }, | |
69 | { "full", no_argument, NULL, ARG_FULL }, | |
70 | { NULL, 0, NULL, 0 } | |
71 | }; | |
72 | ||
73 | int c; | |
74 | ||
75 | assert(argc >= 1); | |
76 | assert(argv); | |
77 | ||
78 | while ((c = getopt_long(argc, argv, "hka", options, NULL)) >= 0) { | |
79 | ||
80 | switch (c) { | |
81 | ||
82 | case 'h': | |
83 | help(); | |
84 | return 0; | |
85 | ||
86 | case ARG_VERSION: | |
87 | puts(PACKAGE_STRING); | |
88 | puts(SYSTEMD_FEATURES); | |
89 | return 0; | |
90 | ||
91 | case ARG_NO_PAGER: | |
92 | arg_no_pager = true; | |
93 | break; | |
94 | ||
95 | case 'a': | |
96 | arg_all = true; | |
97 | break; | |
98 | ||
99 | case ARG_FULL: | |
100 | arg_full = true; | |
101 | break; | |
102 | ||
103 | case 'k': | |
104 | arg_kernel_threads = true; | |
105 | break; | |
106 | ||
107 | case '?': | |
108 | return -EINVAL; | |
109 | ||
110 | default: | |
111 | log_error("Unknown option code %c", c); | |
112 | return -EINVAL; | |
113 | } | |
114 | } | |
115 | ||
116 | return 1; | |
117 | } | |
118 | ||
119 | int main(int argc, char *argv[]) { | |
120 | int r = 0, retval = EXIT_FAILURE; | |
121 | int output_flags; | |
122 | ||
123 | log_parse_environment(); | |
124 | log_open(); | |
125 | ||
126 | r = parse_argv(argc, argv); | |
127 | if (r < 0) | |
128 | goto finish; | |
129 | else if (r == 0) { | |
130 | retval = EXIT_SUCCESS; | |
131 | goto finish; | |
132 | } | |
133 | ||
134 | if (!arg_no_pager) { | |
135 | r = pager_open(false); | |
136 | if (r > 0) { | |
137 | if (arg_full == -1) | |
138 | arg_full = true; | |
139 | } | |
140 | } | |
141 | ||
142 | output_flags = | |
143 | arg_all * OUTPUT_SHOW_ALL | | |
144 | (arg_full > 0) * OUTPUT_FULL_WIDTH; | |
145 | ||
146 | if (optind < argc) { | |
147 | unsigned i; | |
148 | ||
149 | for (i = (unsigned) optind; i < (unsigned) argc; i++) { | |
150 | int q; | |
151 | printf("%s:\n", argv[i]); | |
152 | ||
153 | q = show_cgroup_by_path(argv[i], NULL, 0, | |
154 | arg_kernel_threads, output_flags); | |
155 | if (q < 0) | |
156 | r = q; | |
157 | } | |
158 | ||
159 | } else { | |
160 | char _cleanup_free_ *p; | |
161 | ||
162 | p = get_current_dir_name(); | |
163 | if (!p) { | |
164 | log_error("Cannot determine current working directory: %m"); | |
165 | goto finish; | |
166 | } | |
167 | ||
168 | if (path_startswith(p, "/sys/fs/cgroup")) { | |
169 | printf("Working Directory %s:\n", p); | |
170 | r = show_cgroup_by_path(p, NULL, 0, | |
171 | arg_kernel_threads, output_flags); | |
172 | } else { | |
173 | char _cleanup_free_ *root = NULL; | |
174 | ||
175 | r = cg_get_root_path(&root); | |
176 | if (r < 0) { | |
177 | log_error("Failed to get root path: %s", strerror(-r)); | |
178 | goto finish; | |
179 | } | |
180 | ||
181 | r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, | |
182 | arg_kernel_threads, output_flags); | |
183 | } | |
184 | } | |
185 | ||
186 | if (r < 0) | |
187 | log_error("Failed to list cgroup tree: %s", strerror(-r)); | |
188 | ||
189 | retval = EXIT_SUCCESS; | |
190 | ||
191 | finish: | |
192 | pager_close(); | |
193 | ||
194 | return retval; | |
195 | } |