chiark / gitweb /
logind: trivial simplification
[elogind.git] / src / login / inhibit.c
index cabf1b9..896fd57 100644 (file)
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <fcntl.h>
 #include <getopt.h>
-#include <assert.h>
-#include <stdlib.h>
 #include <stdio.h>
-#include <dbus.h>
+#include <stdlib.h>
 #include <unistd.h>
 
-#include "dbus-common.h"
-#include "util.h"
-#include "build.h"
+#include "sd-bus.h"
+
+#include "alloc-util.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "process-util.h"
+#include "signal-util.h"
 #include "strv.h"
+#include "user-util.h"
+#include "util.h"
+
+/// Additional includes needed by elogind
+#include "musl_missing.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 = "block";
+static const char* arg_mode = NULL;
 
 static enum {
         ACTION_INHIBIT,
         ACTION_LIST
 } arg_action = ACTION_INHIBIT;
 
-static int inhibit(DBusConnection *bus, DBusError *error) {
-        DBusMessage *reply = NULL;
+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 = bus_method_call_with_reply(
+        r = sd_bus_call_method(
                         bus,
                         "org.freedesktop.login1",
                         "/org/freedesktop/login1",
                         "org.freedesktop.login1.Manager",
                         "Inhibit",
+                        error,
                         &reply,
-                        NULL,
-                        DBUS_TYPE_STRING, &arg_what,
-                        DBUS_TYPE_STRING, &arg_who,
-                        DBUS_TYPE_STRING, &arg_why,
-                        DBUS_TYPE_STRING, &arg_mode,
-                        DBUS_TYPE_INVALID);
+                        "ssss", arg_what, arg_who, arg_why, arg_mode);
         if (r < 0)
                 return r;
 
-        if (!dbus_message_get_args(reply, error,
-                                   DBUS_TYPE_UNIX_FD, &r,
-                                   DBUS_TYPE_INVALID))
-                r = -EIO;
+        r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd);
+        if (r < 0)
+                return r;
 
-        dbus_message_unref(reply);
+        r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
+        if (r < 0)
+                return -errno;
 
         return r;
 }
 
-static int print_inhibitors(DBusConnection *bus, DBusError *error) {
-        DBusMessage *reply = NULL;
+static int print_inhibitors(sd_bus *bus, sd_bus_error *error) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        const char *what, *who, *why, *mode;
+        unsigned int uid, pid;
         unsigned n = 0;
-        DBusMessageIter iter, sub, sub2;
         int r;
 
-        r = bus_method_call_with_reply(
+        r = sd_bus_call_method(
                         bus,
                         "org.freedesktop.login1",
                         "/org/freedesktop/login1",
                         "org.freedesktop.login1.Manager",
                         "ListInhibitors",
+                        error,
                         &reply,
-                        NULL,
-                        DBUS_TYPE_INVALID);
+                        "");
         if (r < 0)
-                goto finish;
-
-        if (!dbus_message_iter_init(reply, &iter)) {
-                r = -ENOMEM;
-                goto finish;
-        }
-
-        if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY) {
-                r = -EIO;
-                goto finish;
-        }
-
-        printf("%-21s %-20s %-20s %-5s %6s %6s\n",
-               "WHAT",
-               "WHO",
-               "WHY",
-               "MODE",
-               "UID",
-               "PID");
-
-        dbus_message_iter_recurse(&iter, &sub);
-        while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
-                const char *what, *who, *why, *mode;
-                char *ewho, *ewhy;
-                dbus_uint32_t uid, pid;
-
-                if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
-                        r = -EIO;
-                        goto finish;
-                }
-
-                dbus_message_iter_recurse(&sub, &sub2);
+                return r;
 
-                if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &what, true) < 0 ||
-                    bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &who, true) < 0 ||
-                    bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &why, true) < 0 ||
-                    bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &mode, true) < 0 ||
-                    bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
-                    bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &pid, false) < 0) {
-                        r = -EIO;
-                        goto finish;
-                }
+        r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
+        if (r < 0)
+                return bus_log_parse_error(r);
 
-                ewho = ellipsize(who, 20, 66);
-                ewhy = ellipsize(why, 20, 66);
+        while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
+                _cleanup_free_ char *comm = NULL, *u = NULL;
 
-                printf("%-21s %-20s %-20s %-5s %6lu %6lu\n",
-                       what, ewho ? ewho : who, ewhy ? ewhy : why, mode, (unsigned long) uid, (unsigned long) pid);
+                if (arg_mode && !streq(mode, arg_mode))
+                        continue;
 
-                free(ewho);
-                free(ewhy);
+                get_process_comm(pid, &comm);
+                u = uid_to_name(uid);
 
-                dbus_message_iter_next(&sub);
+                printf("     Who: %s (UID "UID_FMT"/%s, PID "PID_FMT"/%s)\n"
+                       "    What: %s\n"
+                       "     Why: %s\n"
+                       "    Mode: %s\n\n",
+                       who, uid, strna(u), pid, strna(comm),
+                       what,
+                       why,
+                       mode);
 
                 n++;
         }
+        if (r < 0)
+                return bus_log_parse_error(r);
 
-        printf("\n%u inhibitors listed.\n", n);
-        r = 0;
-
-finish:
-        if (reply)
-                dbus_message_unref(reply);
+        r = sd_bus_message_exit_container(reply);
+        if (r < 0)
+                return bus_log_parse_error(r);
 
-        return r;
+        printf("%u inhibitors listed.\n", n);
+        return 0;
 }
 
-static int help(void) {
-
+static void help(void) {
         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"
-               "     --what=WHAT          Operations to inhibit, colon separated list of idle,\n"
-               "                          sleep, shutdown\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",
-               program_invocation_short_name);
-
-        return 0;
+               "     --list               List active inhibitors\n"
+               , program_invocation_short_name);
 }
 
 static int parse_argv(int argc, char *argv[]) {
@@ -190,7 +166,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "why",          required_argument, NULL, ARG_WHY          },
                 { "mode",         required_argument, NULL, ARG_MODE         },
                 { "list",         no_argument,       NULL, ARG_LIST         },
-                { NULL,           0,                 NULL, 0                }
+                {}
         };
 
         int c;
@@ -198,7 +174,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -207,10 +183,7 @@ static int parse_argv(int argc, char *argv[]) {
                         return 0;
 
                 case ARG_VERSION:
-                        puts(PACKAGE_STRING);
-                        puts(DISTRIBUTION);
-                        puts(SYSTEMD_FEATURES);
-                        return 0;
+                        return version();
 
                 case ARG_WHAT:
                         arg_what = optarg;
@@ -232,13 +205,17 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_action = ACTION_LIST;
                         break;
 
-                default:
-                        log_error("Unknown option code %c", c);
+                case '?':
                         return -EINVAL;
+
+                default:
+                        assert_not_reached("Unhandled option");
                 }
-        }
 
-        if (arg_action == ACTION_INHIBIT && optind >= argc) {
+        if (arg_action == ACTION_INHIBIT && optind == argc)
+                arg_action = ACTION_LIST;
+
+        else if (arg_action == ACTION_INHIBIT && optind >= argc) {
                 log_error("Missing command line to execute.");
                 return -EINVAL;
         }
@@ -247,84 +224,73 @@ static int parse_argv(int argc, char *argv[]) {
 }
 
 int main(int argc, char *argv[]) {
-        int r, exit_code = 0;
-        DBusConnection *bus = NULL;
-        DBusError error;
-        int fd = -1;
-
-        dbus_error_init(&error);
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        int r;
 
+        elogind_set_program_name(argv[0]);
         log_parse_environment();
         log_open();
 
         r = parse_argv(argc, argv);
-        if (r <= 0)
-                goto finish;
-
-        bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
-        if (!bus) {
-                log_error("Failed to connect to bus: %s", bus_error_message(&error));
-                r = -EIO;
-                goto finish;
+        if (r < 0)
+                return EXIT_FAILURE;
+        if (r == 0)
+                return EXIT_SUCCESS;
+
+        r = sd_bus_default_system(&bus);
+        if (r < 0) {
+                log_error_errno(r, "Failed to connect to bus: %m");
+                return EXIT_FAILURE;
         }
 
         if (arg_action == ACTION_LIST) {
 
                 r = print_inhibitors(bus, &error);
                 if (r < 0) {
-                        log_error("Failed to list inhibitors: %s", bus_error_message_or_strerror(&error, -r));
-                        goto finish;
+                        log_error("Failed to list inhibitors: %s", bus_error_message(&error, -r));
+                        return EXIT_FAILURE;
                 }
 
         } else {
-                char *w = NULL;
+                _cleanup_close_ int fd = -1;
+                _cleanup_free_ char *w = NULL;
                 pid_t pid;
 
                 if (!arg_who)
                         arg_who = w = strv_join(argv + optind, " ");
 
-                fd = inhibit(bus, &error);
-                free(w);
+                if (!arg_mode)
+                        arg_mode = "block";
 
+                fd = inhibit(bus, &error);
                 if (fd < 0) {
-                        log_error("Failed to inhibit: %s", bus_error_message_or_strerror(&error, -r));
-                        r = fd;
-                        goto finish;
+                        log_error("Failed to inhibit: %s", bus_error_message(&error, fd));
+                        return EXIT_FAILURE;
                 }
 
                 pid = fork();
                 if (pid < 0) {
-                        log_error("Failed to fork: %m");
-                        r = -errno;
-                        goto finish;
+                        log_error_errno(errno, "Failed to fork: %m");
+                        return EXIT_FAILURE;
                 }
 
                 if (pid == 0) {
                         /* Child */
 
-                        close_nointr_nofail(fd);
+                        (void) reset_all_signal_handlers();
+                        (void) reset_signal_mask();
+
                         close_all_fds(NULL, 0);
 
                         execvp(argv[optind], argv + optind);
-                        log_error("Failed to execute %s: %m", argv[optind]);
+                        log_error_errno(errno, "Failed to execute %s: %m", argv[optind]);
                         _exit(EXIT_FAILURE);
                 }
 
-                r = wait_for_terminate_and_warn(argv[optind], pid);
-                if (r >= 0)
-                        exit_code = r;
+                r = wait_for_terminate_and_warn(argv[optind], pid, true);
+                return r < 0 ? EXIT_FAILURE : r;
         }
 
-finish:
-        if (bus) {
-                dbus_connection_close(bus);
-                dbus_connection_unref(bus);
-        }
-
-        dbus_error_free(&error);
-
-        if (fd >= 0)
-                close_nointr_nofail(fd);
-
-        return r < 0 ? EXIT_FAILURE : exit_code;
+        return 0;
 }