270 lines
9.2 KiB
C
270 lines
9.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <limits.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <getopt.h>
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#include <string.h>
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#include "cgroup-show.h"
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#include "cgroup-util.h"
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#include "log.h"
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#include "path-util.h"
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#include "util.h"
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#include "pager.h"
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#include "build.h"
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#include "output-mode.h"
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#include "fileio.h"
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#include "sd-bus.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "unit-name.h"
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static bool arg_no_pager = false;
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static bool arg_kernel_threads = false;
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static bool arg_all = false;
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static int arg_full = -1;
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static char* arg_machine = NULL;
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static void help(void) {
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printf("%s [OPTIONS...] [CGROUP...]\n\n"
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"Recursively show control group contents.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --no-pager Do not pipe output into a pager\n"
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" -a --all Show all groups, including empty\n"
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" -l --full Do not ellipsize output\n"
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" -k Include kernel threads in output\n"
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" -M --machine Show container\n"
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, program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_NO_PAGER = 0x100,
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ARG_VERSION,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{ "all", no_argument, NULL, 'a' },
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{ "full", no_argument, NULL, 'l' },
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{ "machine", required_argument, NULL, 'M' },
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{}
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};
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int c;
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assert(argc >= 1);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case ARG_NO_PAGER:
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arg_no_pager = true;
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break;
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case 'a':
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arg_all = true;
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break;
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case 'l':
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arg_full = true;
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break;
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case 'k':
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arg_kernel_threads = true;
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break;
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case 'M':
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arg_machine = optarg;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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int r = 0, retval = EXIT_FAILURE;
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int output_flags;
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_cleanup_free_ char *root = NULL;
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_cleanup_bus_unref_ sd_bus *bus = NULL;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r < 0)
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goto finish;
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else if (r == 0) {
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retval = EXIT_SUCCESS;
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goto finish;
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}
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if (!arg_no_pager) {
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r = pager_open(false);
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if (r > 0) {
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if (arg_full == -1)
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arg_full = true;
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}
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}
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output_flags =
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arg_all * OUTPUT_SHOW_ALL |
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(arg_full > 0) * OUTPUT_FULL_WIDTH;
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r = bus_open_transport(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
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if (r < 0) {
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log_error("Failed to create bus connection: %s", strerror(-r));
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goto finish;
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}
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if (optind < argc) {
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int i;
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for (i = optind; i < argc; i++) {
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int q;
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fprintf(stdout, "%s:\n", argv[i]);
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fflush(stdout);
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if (arg_machine)
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root = strjoin("machine/", arg_machine, "/", argv[i], NULL);
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else
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root = strdup(argv[i]);
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if (!root)
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return log_oom();
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q = show_cgroup_by_path(root, NULL, 0,
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arg_kernel_threads, output_flags);
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if (q < 0)
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r = q;
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}
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} else {
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_cleanup_free_ char *p;
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p = get_current_dir_name();
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if (!p) {
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log_error("Cannot determine current working directory: %m");
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goto finish;
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}
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if (path_startswith(p, "/sys/fs/cgroup") && !arg_machine) {
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printf("Working Directory %s:\n", p);
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r = show_cgroup_by_path(p, NULL, 0,
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arg_kernel_threads, output_flags);
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} else {
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if (arg_machine) {
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char *m;
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const char *cgroup;
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_cleanup_free_ char *scope = NULL;
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_cleanup_free_ char *path = NULL;
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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m = strappenda("/run/systemd/machines/", arg_machine);
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r = parse_env_file(m, NEWLINE, "SCOPE", &scope, NULL);
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if (r < 0) {
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log_error("Failed to get machine path: %s", strerror(-r));
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goto finish;
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}
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path = unit_dbus_path_from_name(scope);
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if (!path) {
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log_oom();
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goto finish;
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}
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r = sd_bus_get_property(
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bus,
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"org.freedesktop.systemd1",
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path,
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"org.freedesktop.systemd1.Scope",
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"ControlGroup",
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&error,
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&reply,
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"s");
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if (r < 0) {
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log_error("Failed to query ControlGroup: %s", bus_error_message(&error, -r));
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goto finish;
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}
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r = sd_bus_message_read(reply, "s", &cgroup);
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if (r < 0) {
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bus_log_parse_error(r);
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goto finish;
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}
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root = strdup(cgroup);
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if (!root) {
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log_oom();
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goto finish;
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}
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} else
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r = cg_get_root_path(&root);
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if (r < 0) {
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log_error("Failed to get %s path: %s",
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arg_machine ? "machine" : "root", strerror(-r));
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goto finish;
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}
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r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0,
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arg_kernel_threads, output_flags);
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}
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}
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if (r < 0) {
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log_error("Failed to list cgroup tree %s: %s", root, strerror(-r));
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retval = EXIT_FAILURE;
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} else
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retval = EXIT_SUCCESS;
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finish:
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pager_close();
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return retval;
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}
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