#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"

#include "output-mode.h"

#include "fileio.h"

static bool arg_no_pager = false;

static bool arg_kernel_threads = false;

static bool arg_all = false;

static int arg_full = -1;

static char* arg_machine = NULL;

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"

" -l --full Do not ellipsize output\n"

" -k Include kernel threads in output\n"

" -M --machine Show container\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' },

{ "full", no_argument, NULL, 'l' },

{ "machine", required_argument, NULL, 'M' },

{ NULL, 0, NULL, 0 }

};

int c;

assert(argc >= 1);

assert(argv);

while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0) {

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case ARG_NO_PAGER:

arg_no_pager = true;

break;

case 'a':

arg_all = true;

break;

case 'l':

arg_full = true;

break;

case 'k':

arg_kernel_threads = true;

break;

case 'M':

arg_machine = optarg;

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;

int output_flags;

char _cleanup_free_ *root = NULL;

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) {

r = pager_open(false);

if (r > 0) {

if (arg_full == -1)

arg_full = true;

}

}

output_flags =

arg_all * OUTPUT_SHOW_ALL |

(arg_full > 0) * OUTPUT_FULL_WIDTH;

if (optind < argc) {

int i;

for (i = optind; i < argc; i++) {

int q;

printf("%s:\n", argv[i]);

if (arg_machine)

root = strjoin("machine/", arg_machine, "/", argv[i], NULL);

else

root = strdup(argv[i]);

if (!root)

return log_oom();

q = show_cgroup_by_path(root, NULL, 0,

arg_kernel_threads, output_flags);

if (q < 0)

r = q;

}

} else {

_cleanup_free_ 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") && !arg_machine) {

printf("Working Directory %s:\n", p);

r = show_cgroup_by_path(p, NULL, 0,

arg_kernel_threads, output_flags);

} else {

if (arg_machine) {

char *m;

m = strappenda("/run/systemd/machines/", arg_machine);

r = parse_env_file(m, NEWLINE, "CGROUP", &root, NULL);

} else

r = cg_get_root_path(&root);

if (r < 0) {

log_error("Failed to get %s path: %s",

arg_machine ? "machine" : "root", strerror(-r));

goto finish;

}

r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0,

arg_kernel_threads, output_flags);

}

}

if (r < 0) {

log_error("Failed to list cgroup tree %s: %s", root, strerror(-r));

retval = EXIT_FAILURE;

} else

retval = EXIT_SUCCESS;

finish:

pager_close();

return retval;

}