summaryrefslogtreecommitdiff
path: root/src/cgls/cgls.c
blob: b2cd968e46cfeeae5b39f347db7b50739235ff82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <limits.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <string.h>

#include "cgroup-show.h"
#include "cgroup-util.h"
#include "log.h"
#include "path-util.h"
#include "util.h"
#include "pager.h"
#include "build.h"

static bool arg_no_pager = false;
static bool arg_kernel_threads = false;
static bool arg_all = false;

static void help(void) {

        printf("%s [OPTIONS...] [CGROUP...]\n\n"
               "Recursively show control group contents.\n\n"
               "  -h --help           Show this help\n"
               "     --version        Show package version\n"
               "     --no-pager       Do not pipe output into a pager\n"
               "  -a --all            Show all groups, including empty\n"
               "  -k                  Include kernel threads in output\n",
               program_invocation_short_name);
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_NO_PAGER = 0x100,
                ARG_VERSION
        };

        static const struct option options[] = {
                { "help",      no_argument,       NULL, 'h'          },
                { "version",   no_argument,       NULL, ARG_VERSION  },
                { "no-pager",  no_argument,       NULL, ARG_NO_PAGER },
                { "all",       no_argument,       NULL, 'a'          },
                { NULL,        0,                 NULL, 0            }
        };

        int c;

        assert(argc >= 1);
        assert(argv);

        while ((c = getopt_long(argc, argv, "hka", options, NULL)) >= 0) {

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_VERSION:
                        puts(PACKAGE_STRING);
                        puts(DISTRIBUTION);
                        puts(SYSTEMD_FEATURES);
                        return 0;

                case ARG_NO_PAGER:
                        arg_no_pager = true;
                        break;

                case 'a':
                        arg_all = true;
                        break;

                case 'k':
                        arg_kernel_threads = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }
        }

        return 1;
}

int main(int argc, char *argv[]) {
        int r = 0, retval = EXIT_FAILURE;

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r < 0)
                goto finish;
        else if (r == 0) {
                retval = EXIT_SUCCESS;
                goto finish;
        }

        if (!arg_no_pager)
                pager_open();

        if (optind < argc) {
                unsigned i;

                for (i = (unsigned) optind; i < (unsigned) argc; i++) {
                        int q;
                        printf("%s:\n", argv[i]);

                        q = show_cgroup_by_path(argv[i], NULL, 0, arg_kernel_threads, arg_all);
                        if (q < 0)
                                r = q;
                }

        } else {
                char *p;

                p = get_current_dir_name();
                if (!p) {
                        log_error("Cannot determine current working directory: %m");
                        goto finish;
                }

                if (path_startswith(p, "/sys/fs/cgroup")) {
                        printf("Working Directory %s:\n", p);
                        r = show_cgroup_by_path(p, NULL, 0, arg_kernel_threads, arg_all);
                } else {
                        char *root = NULL;
                        const char *t = NULL;

                        r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
                        if (r < 0)
                                t = "/";
                        else {
                                if (endswith(root, "/system"))
                                        root[strlen(root)-7] = 0;

                                t = root[0] ? root : "/";
                        }

                        r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, t, NULL, 0, arg_kernel_threads, arg_all);
                        free(root);
                }

                free(p);
        }

        if (r < 0)
                log_error("Failed to list cgroup tree: %s", strerror(-r));

        retval = EXIT_SUCCESS;

finish:
        pager_close();

        return retval;
}