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/***
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 <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "cgroup-show.h"
#include "cgroup-util.h"
#include "fileio.h"
#include "log.h"
#include "output-mode.h"
#include "pager.h"
#include "path-util.h"
#include "unit-name.h"
#include "util.h"
static bool arg_no_pager = false;
static bool arg_kernel_threads = false;
static bool arg_all = false;
static int arg_full = -1;
static char* arg_machine = NULL;
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"
" -l --full Do not ellipsize output\n"
" -k Include kernel threads in output\n"
" -M --machine= Show container\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' },
{ "full", no_argument, NULL, 'l' },
{ "machine", required_argument, NULL, 'M' },
{}
};
int c;
assert(argc >= 1);
assert(argv);
while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case ARG_NO_PAGER:
arg_no_pager = true;
break;
case 'a':
arg_all = true;
break;
case 'l':
arg_full = true;
break;
case 'k':
arg_kernel_threads = true;
break;
case 'M':
arg_machine = optarg;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
return 1;
}
static void show_cg_info(const char *controller, const char *path) {
if (cg_all_unified() <= 0 && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER))
printf("Controller %s; ", controller);
printf("Control group %s:\n", isempty(path) ? "/" : path);
fflush(stdout);
}
int main(int argc, char *argv[]) {
int r, output_flags;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
if (!arg_no_pager) {
r = pager_open(arg_no_pager, false);
if (r > 0 && arg_full < 0)
arg_full = true;
}
output_flags =
arg_all * OUTPUT_SHOW_ALL |
(arg_full > 0) * OUTPUT_FULL_WIDTH |
arg_kernel_threads * OUTPUT_KERNEL_THREADS;
if (optind < argc) {
_cleanup_free_ char *root = NULL;
int i;
r = show_cgroup_get_root_and_warn(arg_machine, &root);
if (r < 0)
goto finish;
for (i = optind; i < argc; i++) {
int q;
if (path_startswith(argv[i], "/sys/fs/cgroup")) {
printf("Directory %s:\n", argv[i]);
fflush(stdout);
q = show_cgroup_by_path(argv[i], NULL, 0, output_flags);
} else {
_cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
const char *controller, *path;
r = cg_split_spec(argv[i], &c, &p);
if (r < 0) {
log_error_errno(r, "Failed to split argument %s: %m", argv[i]);
goto finish;
}
controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
if (p) {
j = strjoin(root, "/", p);
if (!j) {
r = log_oom();
goto finish;
}
path_kill_slashes(j);
path = j;
} else
path = root;
show_cg_info(controller, path);
q = show_cgroup(controller, path, NULL, 0, output_flags);
}
if (q < 0)
r = q;
}
} else {
bool done = false;
if (!arg_machine) {
_cleanup_free_ char *cwd = NULL;
cwd = get_current_dir_name();
if (!cwd) {
r = log_error_errno(errno, "Cannot determine current working directory: %m");
goto finish;
}
if (path_startswith(cwd, "/sys/fs/cgroup")) {
printf("Working directory %s:\n", cwd);
fflush(stdout);
r = show_cgroup_by_path(cwd, NULL, 0, output_flags);
done = true;
}
}
if (!done) {
_cleanup_free_ char *root = NULL;
r = show_cgroup_get_root_and_warn(arg_machine, &root);
if (r < 0)
goto finish;
show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root);
printf("-.slice\n");
r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, output_flags);
}
}
if (r < 0)
log_error_errno(r, "Failed to list cgroup tree: %m");
finish:
pager_close();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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