1 files changed, 164 insertions, 0 deletions
diff --git a/src/cgls.c b/src/cgls.c
new file mode 100644
index 0000000000..d5417f9505
--- /dev/null
+++ b/src/cgls.c
@@ -0,0 +1,164 @@
+/*-*- 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 General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <limits.h>
+#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 "util.h"
+#include "pager.h"
+
+static bool arg_no_pager = false;
+static bool arg_kernel_threads = false;
+
+static void help(void) {
+
+        printf("%s [OPTIONS...] [CGROUP...]\n\n"
+               "Recursively show control group contents.\n\n"
+               "  -h --help           Show this help\n"
+               "     --no-pager       Do not pipe output into a pager\n"
+               "  -k                  Include kernel threads in output\n",
+               program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_NO_PAGER = 0x100
+        };
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, 'h'          },
+                { "no-pager",  no_argument,       NULL, ARG_NO_PAGER },
+                { NULL,        0,                 NULL, 0            }
+        };
+
+        int c;
+
+        assert(argc >= 1);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hk", options, NULL)) >= 0) {
+
+                switch (c) {
+
+                case 'h':
+                        help();
+                        return 0;
+
+                case ARG_NO_PAGER:
+                        arg_no_pager = true;
+                        break;
+
+                case 'k':
+                        arg_kernel_threads = true;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        log_error("Unknown option code %c", c);
+                        return -EINVAL;
+                }
+        }
+
+        return 1;
+}
+
+int main(int argc, char *argv[]) {
+        int r = 0, retval = EXIT_FAILURE;
+
+        log_parse_environment();
+        log_open();
+
+        r = parse_argv(argc, argv);
+        if (r < 0)
+                goto finish;
+        else if (r == 0) {
+                retval = EXIT_SUCCESS;
+                goto finish;
+        }
+
+        if (!arg_no_pager)
+                pager_open();
+
+        if (optind < argc) {
+                unsigned i;
+
+                for (i = (unsigned) optind; i < (unsigned) argc; i++) {
+                        int q;
+                        printf("%s:\n", argv[i]);
+
+                        q = show_cgroup_by_path(argv[i], NULL, 0, arg_kernel_threads);
+                        if (q < 0)
+                                r = q;
+                }
+
+        } else {
+                char *p;
+
+                p = get_current_dir_name();
+                if (!p) {
+                        log_error("Cannot determine current working directory: %m");
+                        goto finish;
+                }
+
+                if (path_startswith(p, "/sys/fs/cgroup")) {
+                        printf("Working Directory %s:\n", p);
+                        r = show_cgroup_by_path(p, NULL, 0, arg_kernel_threads);
+                } else {
+                        char *root = NULL;
+                        const char *t = NULL;
+
+                        r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
+                        if (r < 0)
+                                t = "/";
+                        else {
+                                if (endswith(root, "/system"))
+                                        root[strlen(root)-7] = 0;
+
+                                t = root[0] ? root : "/";
+                        }
+
+                        r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, t, NULL, 0, arg_kernel_threads);
+                        free(root);
+                }
+
+                free(p);
+        }
+
+        if (r < 0)
+                log_error("Failed to list cgroup tree: %s", strerror(-r));
+
+        retval = EXIT_SUCCESS;
+
+finish:
+        pager_close();
+
+        return retval;
+}