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