165 lines
4.6 KiB
C
165 lines
4.6 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 "util.h"
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#include "pager.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 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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" --no-pager Do not pipe output into a pager\n"
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" -k Include kernel threads in output\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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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{ NULL, 0, NULL, 0 }
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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, "hk", 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_NO_PAGER:
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arg_no_pager = 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 '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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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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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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pager_open();
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if (optind < argc) {
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unsigned i;
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for (i = (unsigned) optind; i < (unsigned) argc; i++) {
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int q;
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printf("%s:\n", argv[i]);
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q = show_cgroup_by_path(argv[i], NULL, 0, arg_kernel_threads);
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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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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")) {
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printf("Working Directory %s:\n", p);
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r = show_cgroup_by_path(p, NULL, 0, arg_kernel_threads);
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} else {
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char *root = NULL;
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const char *t = NULL;
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r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
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if (r < 0)
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t = "/";
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else {
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if (endswith(root, "/system"))
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root[strlen(root)-7] = 0;
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t = root[0] ? root : "/";
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}
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r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, t, NULL, 0, arg_kernel_threads);
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free(root);
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}
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free(p);
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}
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if (r < 0)
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log_error("Failed to list cgroup tree: %s", strerror(-r));
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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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