/*-*- 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 <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" #include "output-mode.h" #include "fileio.h" #include "sd-bus.h" #include "bus-util.h" #include "bus-error.h" #include "unit-name.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: puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; 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 int get_cgroup_root(char **ret) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; _cleanup_free_ char *unit = NULL, *path = NULL; const char *m; int r; if (!arg_machine) { r = cg_get_root_path(ret); if (r < 0) return log_error_errno(r, "Failed to get root control group path: %m"); return 0; } m = strjoina("/run/systemd/machines/", arg_machine); r = parse_env_file(m, NEWLINE, "SCOPE", &unit, NULL); if (r < 0) return log_error_errno(r, "Failed to load machine data: %m"); path = unit_dbus_path_from_name(unit); if (!path) return log_oom(); r = bus_open_transport(BUS_TRANSPORT_LOCAL, NULL, false, &bus); if (r < 0) return log_error_errno(r, "Failed to create bus connection: %m"); r = sd_bus_get_property_string( bus, "org.freedesktop.systemd1", path, unit_dbus_interface_from_name(unit), "ControlGroup", &error, ret); if (r < 0) return log_error_errno(r, "Failed to query unit control group path: %s", bus_error_message(&error, r)); return 0; } static void show_cg_info(const char *controller, const char *path) { if (cg_unified() <= 0) 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(false); if (r > 0 && arg_full < 0) arg_full = true; } output_flags = arg_all * OUTPUT_SHOW_ALL | (arg_full > 0) * OUTPUT_FULL_WIDTH; if (optind < argc) { _cleanup_free_ char *root = NULL; int i; r = get_cgroup_root(&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, arg_kernel_threads, 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, NULL); 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, arg_kernel_threads, 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, arg_kernel_threads, output_flags); done = true; } } if (!done) { _cleanup_free_ char *root = NULL; r = get_cgroup_root(&root); if (r < 0) goto finish; show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root); r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, arg_kernel_threads, 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; }