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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "fd-util.h"
#include "format-table.h"
#include "format-util.h"
#include "main-func.h"
#include "pager.h"
#include "pretty-print.h"
#include "process-util.h"
#include "signal-util.h"
#include "strv.h"
#include "user-util.h"
#include "util.h"
static const char* arg_what = "idle:sleep:shutdown";
static const char* arg_who = NULL;
static const char* arg_why = "Unknown reason";
static const char* arg_mode = NULL;
static PagerFlags arg_pager_flags = 0;
static bool arg_legend = true;
static enum {
ACTION_INHIBIT,
ACTION_LIST
} arg_action = ACTION_INHIBIT;
static int inhibit(sd_bus *bus, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
int r;
int fd;
r = sd_bus_call_method(
bus,
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"Inhibit",
error,
&reply,
"ssss", arg_what, arg_who, arg_why, arg_mode);
if (r < 0)
return r;
r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd);
if (r < 0)
return r;
r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
if (r < 0)
return -errno;
return r;
}
static int print_inhibitors(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(table_unrefp) Table *table = NULL;
int r;
(void) pager_open(arg_pager_flags);
r = sd_bus_call_method(
bus,
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"ListInhibitors",
&error,
&reply,
"");
if (r < 0)
return log_error_errno(r, "Could not get active inhibitors: %s", bus_error_message(&error, r));
table = table_new("who", "uid", "user", "pid", "comm", "what", "why", "mode");
if (!table)
return log_oom();
/* If there's not enough space, shorten the "WHY" column, as it's little more than an explaining comment. */
(void) table_set_weight(table, TABLE_HEADER_CELL(6), 20);
r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
if (r < 0)
return bus_log_parse_error(r);
for (;;) {
_cleanup_free_ char *comm = NULL, *u = NULL;
const char *what, *who, *why, *mode;
uint32_t uid, pid;
r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid);
if (r < 0)
return bus_log_parse_error(r);
if (r == 0)
break;
if (arg_mode && !streq(mode, arg_mode))
continue;
(void) get_process_comm(pid, &comm);
u = uid_to_name(uid);
r = table_add_many(table,
TABLE_STRING, who,
TABLE_UINT32, uid,
TABLE_STRING, strna(u),
TABLE_UINT32, pid,
TABLE_STRING, strna(comm),
TABLE_STRING, what,
TABLE_STRING, why,
TABLE_STRING, mode);
if (r < 0)
return log_error_errno(r, "Failed to add table row: %m");
}
r = sd_bus_message_exit_container(reply);
if (r < 0)
return bus_log_parse_error(r);
if (table_get_rows(table) > 1) {
r = table_set_sort(table, (size_t) 1, (size_t) 0, (size_t) 5, (size_t) 6, (size_t) -1);
if (r < 0)
return log_error_errno(r, "Failed to sort table: %m");
table_set_header(table, arg_legend);
r = table_print(table, NULL);
if (r < 0)
return log_error_errno(r, "Failed to show table: %m");
}
if (arg_legend) {
if (table_get_rows(table) > 1)
printf("\n%zu inhibitors listed.\n", table_get_rows(table) - 1);
else
printf("No inhibitors.\n");
}
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-inhibit", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
"Execute a process while inhibiting shutdown/sleep/idle.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --no-pager Do not pipe output into a pager\n"
" --no-legend Do not show the headers and footers\n"
" --what=WHAT Operations to inhibit, colon separated list of:\n"
" shutdown, sleep, idle, handle-power-key,\n"
" handle-suspend-key, handle-hibernate-key,\n"
" handle-lid-switch\n"
" --who=STRING A descriptive string who is inhibiting\n"
" --why=STRING A descriptive string why is being inhibited\n"
" --mode=MODE One of block or delay\n"
" --list List active inhibitors\n"
"\nSee the %s for details.\n"
, program_invocation_short_name
, link
);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_WHAT,
ARG_WHO,
ARG_WHY,
ARG_MODE,
ARG_LIST,
ARG_NO_PAGER,
ARG_NO_LEGEND,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "what", required_argument, NULL, ARG_WHAT },
{ "who", required_argument, NULL, ARG_WHO },
{ "why", required_argument, NULL, ARG_WHY },
{ "mode", required_argument, NULL, ARG_MODE },
{ "list", no_argument, NULL, ARG_LIST },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "no-legend", no_argument, NULL, ARG_NO_LEGEND },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_WHAT:
arg_what = optarg;
break;
case ARG_WHO:
arg_who = optarg;
break;
case ARG_WHY:
arg_why = optarg;
break;
case ARG_MODE:
arg_mode = optarg;
break;
case ARG_LIST:
arg_action = ACTION_LIST;
break;
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case ARG_NO_LEGEND:
arg_legend = false;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (arg_action == ACTION_INHIBIT && optind == argc)
arg_action = ACTION_LIST;
else if (arg_action == ACTION_INHIBIT && optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Missing command line to execute.");
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = sd_bus_default_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to bus: %m");
if (arg_action == ACTION_LIST)
return print_inhibitors(bus);
else {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_close_ int fd = -1;
_cleanup_free_ char *w = NULL;
pid_t pid;
/* Ignore SIGINT and allow the forked process to receive it */
(void) ignore_signals(SIGINT, -1);
if (!arg_who)
arg_who = w = strv_join(argv + optind, " ");
if (!arg_mode)
arg_mode = "block";
fd = inhibit(bus, &error);
if (fd < 0)
return log_error_errno(fd, "Failed to inhibit: %s", bus_error_message(&error, fd));
r = safe_fork("(inhibit)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
execvp(argv[optind], argv + optind);
log_open();
log_error_errno(errno, "Failed to execute %s: %m", argv[optind]);
_exit(EXIT_FAILURE);
}
return wait_for_terminate_and_check(argv[optind], pid, WAIT_LOG);
}
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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