| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| /*** |
| 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-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 "strv.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 enum { |
| SHOW_UNIT_NONE, |
| SHOW_UNIT_SYSTEM, |
| SHOW_UNIT_USER, |
| } arg_show_unit = SHOW_UNIT_NONE; |
| static char **arg_names = NULL; |
| |
| 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" |
| " -u --unit Show the subtrees of specifified system units\n" |
| " --user-unit Show the subtrees of specifified user units\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, |
| ARG_USER_UNIT, |
| }; |
| |
| 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' }, |
| { "unit", optional_argument, NULL, 'u' }, |
| { "user-unit", optional_argument, NULL, ARG_USER_UNIT }, |
| {} |
| }; |
| |
| int c; |
| |
| assert(argc >= 1); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "-hkalM:u::", 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 'u': |
| arg_show_unit = SHOW_UNIT_SYSTEM; |
| if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */ |
| return log_oom(); |
| break; |
| |
| case ARG_USER_UNIT: |
| arg_show_unit = SHOW_UNIT_USER; |
| if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */ |
| return log_oom(); |
| break; |
| |
| case 1: |
| /* positional argument */ |
| if (strv_push(&arg_names, optarg) < 0) |
| return log_oom(); |
| 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"); |
| } |
| |
| if (arg_machine && arg_show_unit != SHOW_UNIT_NONE) { |
| log_error("Cannot combine --unit or --user-unit with --machine=."); |
| return -EINVAL; |
| } |
| |
| 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 (arg_names) { |
| _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
| _cleanup_free_ char *root = NULL; |
| char **name; |
| |
| STRV_FOREACH(name, arg_names) { |
| int q; |
| |
| if (arg_show_unit != SHOW_UNIT_NONE) { |
| /* Command line arguments are unit names */ |
| _cleanup_free_ char *cgroup = NULL; |
| |
| if (!bus) { |
| /* Connect to the bus only if necessary */ |
| r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, |
| arg_show_unit == SHOW_UNIT_USER, |
| &bus); |
| if (r < 0) { |
| log_error_errno(r, "Failed to create bus connection: %m"); |
| goto finish; |
| } |
| } |
| |
| q = show_cgroup_get_unit_path_and_warn(bus, *name, &cgroup); |
| if (q < 0) |
| goto failed; |
| |
| if (isempty(cgroup)) { |
| log_warning("Unit %s not found.", *name); |
| q = -ENOENT; |
| goto failed; |
| } |
| |
| printf("Unit %s (%s):\n", *name, cgroup); |
| fflush(stdout); |
| |
| q = show_cgroup_by_path(cgroup, NULL, 0, output_flags); |
| |
| } else if (path_startswith(*name, "/sys/fs/cgroup")) { |
| |
| printf("Directory %s:\n", *name); |
| fflush(stdout); |
| |
| q = show_cgroup_by_path(*name, NULL, 0, output_flags); |
| } else { |
| _cleanup_free_ char *c = NULL, *p = NULL, *j = NULL; |
| const char *controller, *path; |
| |
| if (!root) { |
| /* Query root only if needed, treat error as fatal */ |
| r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root); |
| if (r < 0) |
| goto finish; |
| } |
| |
| q = cg_split_spec(*name, &c, &p); |
| if (q < 0) { |
| log_error_errno(q, "Failed to split argument %s: %m", *name); |
| goto failed; |
| } |
| |
| 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); |
| } |
| |
| failed: |
| if (q < 0 && r >= 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_path_and_warn(arg_machine, NULL, &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(); |
| free(arg_names); /* don't free the strings */ |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |