cgls: beef up control group dumping and introduce cgls tool

1 files changed, 121 insertions, 0 deletions

diff --git a/src/systemd-cgls.c b/src/systemd-cgls.c
new file mode 100644
index 0000000000..6614f0fd25
--- /dev/null
+++ b/src/systemd-cgls.c
@@ -0,0 +1,121 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+  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 "log.h"
+#include "util.h"
+
+static void help(void) {
+
+        printf("%s [OPTIONS...] [CGROUP...]\n\n"
+               "Recursively show control group contents.\n\n"
+               "  -h --help         Show this help\n",
+               program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, 'h'         },
+                { NULL,        0,                 NULL, 0           }
+        };
+
+        int c;
+
+        assert(argc >= 1);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
+
+                switch (c) {
+
+                case 'h':
+                        help();
+                        return 0;
+
+                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 = 1;
+
+        log_parse_environment();
+
+        if ((r = parse_argv(argc, argv)) < 0)
+                goto finish;
+        else if (r == 0) {
+                retval = 0;
+                goto finish;
+        }
+
+        if (optind < argc) {
+                unsigned i;
+
+                for (i = (unsigned) optind; i < (unsigned) argc; i++) {
+                        int q;
+                        printf("%s:\n", argv[i]);
+
+                        if ((q = show_cgroup_recursive(argv[i], NULL, 0)) < 0)
+                                r = q;
+                }
+
+        } else {
+                char *p;
+
+                if (!(p = get_current_dir_name())) {
+                        log_error("Cannot determine current working directory: %m");
+                        goto finish;
+                }
+
+                if (path_startswith(p, "/cgroup")) {
+                        printf("Working Directory %s:\n", p);
+                        r = show_cgroup_recursive(p, NULL, 0);
+                } else
+                        r = show_cgroup_recursive("", NULL, 0);
+
+                free(p);
+        }
+
+        if (r < 0)
+                log_error("Failed to list cgroup tree: %s", strerror(-r));
+
+        retval = 0;
+
+finish:
+
+        return retval;
+}