/*-*- 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; }