diff options
Diffstat (limited to 'src/cgls/cgls.c')
| -rw-r--r-- | src/cgls/cgls.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c new file mode 100644 index 0000000000..b2cd968e46 --- /dev/null +++ b/src/cgls/cgls.c @@ -0,0 +1,182 @@ +/*-*- 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 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 <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 "path-util.h" +#include "util.h" +#include "pager.h" +#include "build.h" + +static bool arg_no_pager = false; +static bool arg_kernel_threads = false; +static bool arg_all = false; + +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" + " -k Include kernel threads in output\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' }, + { NULL, 0, NULL, 0 } + }; + + int c; + + assert(argc >= 1); + assert(argv); + + while ((c = getopt_long(argc, argv, "hka", options, NULL)) >= 0) { + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_VERSION: + puts(PACKAGE_STRING); + puts(DISTRIBUTION); + puts(SYSTEMD_FEATURES); + return 0; + + case ARG_NO_PAGER: + arg_no_pager = true; + break; + + case 'a': + arg_all = 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, arg_all); + 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, arg_all); + } 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, arg_all); + 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; +} |