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/*-*- 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 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",
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, "h", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_NO_PAGER:
arg_no_pager = 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();
if ((r = parse_argv(argc, argv)) < 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]);
if ((q = show_cgroup_by_path(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, "/sys/fs/cgroup")) {
printf("Working Directory %s:\n", p);
r = show_cgroup_by_path(p, NULL, 0);
} else {
char *root = NULL;
const char *t = NULL;
if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root)) < 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);
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;
}
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