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Diffstat (limited to 'src/systemd-cgls/cgls.c')
-rw-r--r--src/systemd-cgls/cgls.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/src/systemd-cgls/cgls.c b/src/systemd-cgls/cgls.c
new file mode 100644
index 0000000000..818f3a6873
--- /dev/null
+++ b/src/systemd-cgls/cgls.c
@@ -0,0 +1,288 @@
+/***
+ 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 <systemd/sd-bus.h>
+
+#include "sd-bus/bus-error.h"
+#include "sd-bus/bus-util.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/cgroup-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/unit-name.h"
+#include "systemd-basic/util.h"
+#include "systemd-shared/cgroup-show.h"
+#include "systemd-shared/output-mode.h"
+#include "systemd-shared/pager.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 int get_cgroup_root(char **ret) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_flush_close_unrefp) 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 == -ENOMEDIUM)
+ return log_error_errno(r, "Failed to get root control group path: No cgroup filesystem mounted on /sys/fs/cgroup");
+ else 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_connect_transport_systemd(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_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 = 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, 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, 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 = get_cgroup_root(&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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 13:41:25 +0000