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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
fa776d8e LP |
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 General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU 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" | |
c6c18be3 | 30 | #include "cgroup-util.h" |
fa776d8e LP |
31 | #include "log.h" |
32 | #include "util.h" | |
1968a360 LP |
33 | #include "pager.h" |
34 | ||
35 | static bool arg_no_pager = false; | |
fa776d8e LP |
36 | |
37 | static void help(void) { | |
38 | ||
39 | printf("%s [OPTIONS...] [CGROUP...]\n\n" | |
40 | "Recursively show control group contents.\n\n" | |
69fc152f LP |
41 | " -h --help Show this help\n" |
42 | " --no-pager Do not pipe output into a pager\n", | |
fa776d8e LP |
43 | program_invocation_short_name); |
44 | } | |
45 | ||
46 | static int parse_argv(int argc, char *argv[]) { | |
47 | ||
1968a360 LP |
48 | enum { |
49 | ARG_NO_PAGER = 0x100 | |
50 | }; | |
51 | ||
fa776d8e | 52 | static const struct option options[] = { |
1968a360 LP |
53 | { "help", no_argument, NULL, 'h' }, |
54 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
55 | { NULL, 0, NULL, 0 } | |
fa776d8e LP |
56 | }; |
57 | ||
58 | int c; | |
59 | ||
60 | assert(argc >= 1); | |
61 | assert(argv); | |
62 | ||
63 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
64 | ||
65 | switch (c) { | |
66 | ||
67 | case 'h': | |
68 | help(); | |
69 | return 0; | |
70 | ||
1968a360 LP |
71 | case ARG_NO_PAGER: |
72 | arg_no_pager = true; | |
73 | break; | |
74 | ||
fa776d8e LP |
75 | case '?': |
76 | return -EINVAL; | |
77 | ||
78 | default: | |
79 | log_error("Unknown option code %c", c); | |
80 | return -EINVAL; | |
81 | } | |
82 | } | |
83 | ||
84 | return 1; | |
85 | } | |
86 | ||
87 | int main(int argc, char *argv[]) { | |
22f4096c | 88 | int r = 0, retval = EXIT_FAILURE; |
fa776d8e LP |
89 | |
90 | log_parse_environment(); | |
2396fb04 | 91 | log_open(); |
fa776d8e LP |
92 | |
93 | if ((r = parse_argv(argc, argv)) < 0) | |
94 | goto finish; | |
95 | else if (r == 0) { | |
22f4096c | 96 | retval = EXIT_SUCCESS; |
fa776d8e LP |
97 | goto finish; |
98 | } | |
99 | ||
1968a360 LP |
100 | if (!arg_no_pager) |
101 | pager_open(); | |
102 | ||
fa776d8e LP |
103 | if (optind < argc) { |
104 | unsigned i; | |
105 | ||
106 | for (i = (unsigned) optind; i < (unsigned) argc; i++) { | |
107 | int q; | |
108 | printf("%s:\n", argv[i]); | |
109 | ||
35d2e7ec | 110 | if ((q = show_cgroup_by_path(argv[i], NULL, 0)) < 0) |
fa776d8e LP |
111 | r = q; |
112 | } | |
113 | ||
114 | } else { | |
115 | char *p; | |
116 | ||
117 | if (!(p = get_current_dir_name())) { | |
118 | log_error("Cannot determine current working directory: %m"); | |
119 | goto finish; | |
120 | } | |
121 | ||
77d5f105 | 122 | if (path_startswith(p, "/sys/fs/cgroup")) { |
fa776d8e | 123 | printf("Working Directory %s:\n", p); |
35d2e7ec | 124 | r = show_cgroup_by_path(p, NULL, 0); |
1f16b4a6 LP |
125 | } else { |
126 | char *root = NULL; | |
127 | const char *t = NULL; | |
128 | ||
129 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root)) < 0) | |
130 | t = "/"; | |
b9a8e638 LP |
131 | else { |
132 | if (endswith(root, "/system")) | |
133 | root[strlen(root)-7] = 0; | |
134 | ||
135 | t = root[0] ? root : "/"; | |
136 | } | |
1f16b4a6 LP |
137 | |
138 | r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, t, NULL, 0); | |
139 | free(root); | |
140 | } | |
fa776d8e LP |
141 | |
142 | free(p); | |
143 | } | |
144 | ||
145 | if (r < 0) | |
146 | log_error("Failed to list cgroup tree: %s", strerror(-r)); | |
147 | ||
22f4096c | 148 | retval = EXIT_SUCCESS; |
fa776d8e LP |
149 | |
150 | finish: | |
1968a360 | 151 | pager_close(); |
fa776d8e LP |
152 | |
153 | return retval; | |
154 | } |