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-rw-r--r--src/login/inhibit.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/src/login/inhibit.c b/src/login/inhibit.c
new file mode 100644
index 0000000..f574d42
--- /dev/null
+++ b/src/login/inhibit.c
@@ -0,0 +1,321 @@
+/* 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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