[thirdparty/systemd.git] / src / initctl.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <sys/socket.h>
#include <sys/types.h>
#include <assert.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/epoll.h>
#include <sys/un.h>
#include <fcntl.h>
#include <ctype.h>

#include <dbus/dbus.h>
#include <systemd/sd-daemon.h>

#include "util.h"
#include "log.h"
#include "list.h"
#include "initreq.h"
#include "special.h"
#include "dbus-common.h"
#include "def.h"

#define SERVER_FD_MAX 16
#define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC))

typedef struct Fifo Fifo;

typedef struct Server {
        int epoll_fd;

        LIST_HEAD(Fifo, fifos);
        unsigned n_fifos;

        DBusConnection *bus;

        bool quit;
} Server;

struct Fifo {
        Server *server;

        int fd;

        struct init_request buffer;
        size_t bytes_read;

        LIST_FIELDS(Fifo, fifo);
};

static const char *translate_runlevel(int runlevel, bool *isolate) {
        static const struct {
                const int runlevel;
                const char *special;
                bool isolate;
        } table[] = {
                { '0', SPECIAL_POWEROFF_TARGET,  false },
                { '1', SPECIAL_RESCUE_TARGET,    true  },
                { 's', SPECIAL_RESCUE_TARGET,    true  },
                { 'S', SPECIAL_RESCUE_TARGET,    true  },
                { '2', SPECIAL_RUNLEVEL2_TARGET, true  },
                { '3', SPECIAL_RUNLEVEL3_TARGET, true  },
                { '4', SPECIAL_RUNLEVEL4_TARGET, true  },
                { '5', SPECIAL_RUNLEVEL5_TARGET, true  },
                { '6', SPECIAL_REBOOT_TARGET,    false },
        };

        unsigned i;

        assert(isolate);

        for (i = 0; i < ELEMENTSOF(table); i++)
                if (table[i].runlevel == runlevel) {
                        *isolate = table[i].isolate;
                        if (runlevel == '6' && kexec_loaded())
                                return SPECIAL_KEXEC_TARGET;
                        return table[i].special;
                }

        return NULL;
}

static void change_runlevel(Server *s, int runlevel) {
        const char *target;
        DBusMessage *m = NULL, *reply = NULL;
        DBusError error;
        const char *mode;
        bool isolate = false;

        assert(s);

        dbus_error_init(&error);

        if (!(target = translate_runlevel(runlevel, &isolate))) {
                log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
                goto finish;
        }

        if (isolate)
                mode = "isolate";
        else
                mode = "replace";

        log_debug("Running request %s/start/%s", target, mode);

        if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
                log_error("Could not allocate message.");
                goto finish;
        }

        if (!dbus_message_append_args(m,
                                      DBUS_TYPE_STRING, &target,
                                      DBUS_TYPE_STRING, &mode,
                                      DBUS_TYPE_INVALID)) {
                log_error("Could not attach target and flag information to message.");
                goto finish;
        }

        if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
                log_error("Failed to start unit: %s", bus_error_message(&error));
                goto finish;
        }

finish:
        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        dbus_error_free(&error);
}

static void request_process(Server *s, const struct init_request *req) {
        assert(s);
        assert(req);

        if (req->magic != INIT_MAGIC) {
                log_error("Got initctl request with invalid magic. Ignoring.");
                return;
        }

        switch (req->cmd) {

        case INIT_CMD_RUNLVL:
                if (!isprint(req->runlevel))
                        log_error("Got invalid runlevel. Ignoring.");
                else
                        switch (req->runlevel) {

                        /* we are async anyway, so just use kill for reexec/reload */
                        case 'u':
                        case 'U':
                                if (kill(1, SIGTERM) < 0)
                                        log_error("kill() failed: %m");

                                /* The bus connection will be
                                 * terminated if PID 1 is reexecuted,
                                 * hence let's just exit here, and
                                 * rely on that we'll be restarted on
                                 * the next request */
                                s->quit = true;
                                break;

                        case 'q':
                        case 'Q':
                                if (kill(1, SIGHUP) < 0)
                                        log_error("kill() failed: %m");
                                break;

                        default:
                                change_runlevel(s, req->runlevel);
                        }
                return;

        case INIT_CMD_POWERFAIL:
        case INIT_CMD_POWERFAILNOW:
        case INIT_CMD_POWEROK:
                log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
                return;

        case INIT_CMD_CHANGECONS:
                log_warning("Received console change initctl request. This is not implemented in systemd.");
                return;

        case INIT_CMD_SETENV:
        case INIT_CMD_UNSETENV:
                log_warning("Received environment initctl request. This is not implemented in systemd.");
                return;

        default:
                log_warning("Received unknown initctl request. Ignoring.");
                return;
        }
}

static int fifo_process(Fifo *f) {
        ssize_t l;

        assert(f);

        errno = EIO;
        if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {

                if (errno == EAGAIN)
                        return 0;

                log_warning("Failed to read from fifo: %s", strerror(errno));
                return -1;
        }

        f->bytes_read += l;
        assert(f->bytes_read <= sizeof(f->buffer));

        if (f->bytes_read == sizeof(f->buffer)) {
                request_process(f->server, &f->buffer);
                f->bytes_read = 0;
        }

        return 0;
}

static void fifo_free(Fifo *f) {
        assert(f);

        if (f->server) {
                assert(f->server->n_fifos > 0);
                f->server->n_fifos--;
                LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
        }

        if (f->fd >= 0) {
                if (f->server)
                        epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);

                close_nointr_nofail(f->fd);
        }

        free(f);
}

static void server_done(Server *s) {
        assert(s);

        while (s->fifos)
                fifo_free(s->fifos);

        if (s->epoll_fd >= 0)
                close_nointr_nofail(s->epoll_fd);

        if (s->bus) {
                dbus_connection_flush(s->bus);
                dbus_connection_close(s->bus);
                dbus_connection_unref(s->bus);
        }
}

static int server_init(Server *s, unsigned n_sockets) {
        int r;
        unsigned i;
        DBusError error;

        assert(s);
        assert(n_sockets > 0);

        dbus_error_init(&error);

        zero(*s);

        if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
                r = -errno;
                log_error("Failed to create epoll object: %s", strerror(errno));
                goto fail;
        }

        for (i = 0; i < n_sockets; i++) {
                struct epoll_event ev;
                Fifo *f;
                int fd;

                fd = SD_LISTEN_FDS_START+i;

                if ((r = sd_is_fifo(fd, NULL)) < 0) {
                        log_error("Failed to determine file descriptor type: %s", strerror(-r));
                        goto fail;
                }

                if (!r) {
                        log_error("Wrong file descriptor type.");
                        r = -EINVAL;
                        goto fail;
                }

                if (!(f = new0(Fifo, 1))) {
                        r = -ENOMEM;
                        log_error("Failed to create fifo object: %s", strerror(errno));
                        goto fail;
                }

                f->fd = -1;

                zero(ev);
                ev.events = EPOLLIN;
                ev.data.ptr = f;
                if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
                        r = -errno;
                        fifo_free(f);
                        log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
                        goto fail;
                }

                f->fd = fd;
                LIST_PREPEND(Fifo, fifo, s->fifos, f);
                f->server = s;
                s->n_fifos ++;
        }

        if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
                log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
                goto fail;
        }

        return 0;

fail:
        server_done(s);

        dbus_error_free(&error);
        return r;
}

static int process_event(Server *s, struct epoll_event *ev) {
        int r;
        Fifo *f;

        assert(s);

        if (!(ev->events & EPOLLIN)) {
                log_info("Got invalid event from epoll. (3)");
                return -EIO;
        }

        f = (Fifo*) ev->data.ptr;

        if ((r = fifo_process(f)) < 0) {
                log_info("Got error on fifo: %s", strerror(-r));
                fifo_free(f);
                return r;
        }

        return 0;
}

int main(int argc, char *argv[]) {
        Server server;
        int r = EXIT_FAILURE, n;

        if (getppid() != 1) {
                log_error("This program should be invoked by init only.");
                return EXIT_FAILURE;
        }

        if (argc > 1) {
                log_error("This program does not take arguments.");
                return EXIT_FAILURE;
        }

        log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
        log_parse_environment();
        log_open();

        umask(0022);

        if ((n = sd_listen_fds(true)) < 0) {
                log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
                return EXIT_FAILURE;
        }

        if (n <= 0 || n > SERVER_FD_MAX) {
                log_error("No or too many file descriptors passed.");
                return EXIT_FAILURE;
        }

        if (server_init(&server, (unsigned) n) < 0)
                return EXIT_FAILURE;

        log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());

        sd_notify(false,
                  "READY=1\n"
                  "STATUS=Processing requests...");

        while (!server.quit) {
                struct epoll_event event;
                int k;

                if ((k = epoll_wait(server.epoll_fd,
                                    &event, 1,
                                    TIMEOUT_MSEC)) < 0) {

                        if (errno == EINTR)
                                continue;

                        log_error("epoll_wait() failed: %s", strerror(errno));
                        goto fail;
                }

                if (k <= 0)
                        break;

                if (process_event(&server, &event) < 0)
                        goto fail;
        }

        r = EXIT_SUCCESS;

        log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());

fail:
        sd_notify(false,
                  "STATUS=Shutting down...");

        server_done(&server);

        dbus_shutdown();

        return r;
}
Commit	Line	Data
d6c9574f	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
0b7964b8 LP	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
	22	#include <sys/socket.h>
	23	#include <sys/types.h>
	24	#include <assert.h>
	25	#include <time.h>
	26	#include <string.h>
	27	#include <stdio.h>
	28	#include <errno.h>
	29	#include <unistd.h>
	30	#include <sys/poll.h>
	31	#include <sys/epoll.h>
	32	#include <sys/un.h>
	33	#include <fcntl.h>
	34	#include <ctype.h>
	35
	36	#include <dbus/dbus.h>
81527be1	37	#include <systemd/sd-daemon.h>
0b7964b8 LP	38
	39	#include "util.h"
	40	#include "log.h"
	41	#include "list.h"
	42	#include "initreq.h"
514f4ef5	43	#include "special.h"
a822056b	44	#include "dbus-common.h"
ef9eb0a8	45	#include "def.h"
0b7964b8	46
0b7964b8	47	#define SERVER_FD_MAX 16
ef9eb0a8	48	#define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC))
0b7964b8 LP	49
	50	typedef struct Fifo Fifo;
	51
	52	typedef struct Server {
	53	int epoll_fd;
	54
	55	LIST_HEAD(Fifo, fifos);
	56	unsigned n_fifos;
	57
	58	DBusConnection *bus;
f632a663 LP	59
f632a663 LP	60	bool quit;
0b7964b8 LP	61	} Server;
	62
	63	struct Fifo {
	64	Server *server;
	65
	66	int fd;
	67
	68	struct init_request buffer;
	69	size_t bytes_read;
	70
	71	LIST_FIELDS(Fifo, fifo);
	72	};
	73
ac83842a	74	static const char translate_runlevel(int runlevel, bool isolate) {
6542952f LP	75	static const struct {
	76	const int runlevel;
	77	const char *special;
ac83842a	78	bool isolate;
6542952f	79	} table[] = {
ac83842a LP	80	{ '0', SPECIAL_POWEROFF_TARGET, false },
	81	{ '1', SPECIAL_RESCUE_TARGET, true },
	82	{ 's', SPECIAL_RESCUE_TARGET, true },
	83	{ 'S', SPECIAL_RESCUE_TARGET, true },
	84	{ '2', SPECIAL_RUNLEVEL2_TARGET, true },
	85	{ '3', SPECIAL_RUNLEVEL3_TARGET, true },
	86	{ '4', SPECIAL_RUNLEVEL4_TARGET, true },
	87	{ '5', SPECIAL_RUNLEVEL5_TARGET, true },
	88	{ '6', SPECIAL_REBOOT_TARGET, false },
6542952f LP	89	};
	90
	91	unsigned i;
	92
ac83842a LP	93	assert(isolate);
ac83842a LP	94
6542952f	95	for (i = 0; i < ELEMENTSOF(table); i++)
ac83842a LP	96	if (table[i].runlevel == runlevel) {
ac83842a LP	97	*isolate = table[i].isolate;
65457142 FC	98	if (runlevel == '6' && kexec_loaded())
65457142 FC	99	return SPECIAL_KEXEC_TARGET;
6542952f	100	return table[i].special;
ac83842a	101	}
6542952f LP	102
6542952f LP	103	return NULL;
0b7964b8 LP	104	}
	105
	106	static void change_runlevel(Server *s, int runlevel) {
	107	const char *target;
	108	DBusMessage m = NULL, reply = NULL;
	109	DBusError error;
ac83842a LP	110	const char *mode;
ac83842a LP	111	bool isolate = false;
0b7964b8 LP	112
	113	assert(s);
	114
	115	dbus_error_init(&error);
	116
ac83842a	117	if (!(target = translate_runlevel(runlevel, &isolate))) {
0b7964b8 LP	118	log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
	119	goto finish;
	120	}
	121
ac83842a LP	122	if (isolate)
	123	mode = "isolate";
	124	else
	125	mode = "replace";
	126
6f0d624e	127	log_debug("Running request %s/start/%s", target, mode);
0b7964b8	128
c87eba54	129	if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
0b7964b8 LP	130	log_error("Could not allocate message.");
	131	goto finish;
	132	}
	133
	134	if (!dbus_message_append_args(m,
	135	DBUS_TYPE_STRING, &target,
ac83842a	136	DBUS_TYPE_STRING, &mode,
0b7964b8	137	DBUS_TYPE_INVALID)) {
5192bd19	138	log_error("Could not attach target and flag information to message.");
0b7964b8 LP	139	goto finish;
	140	}
	141
0b7964b8	142	if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
4cf5d675	143	log_error("Failed to start unit: %s", bus_error_message(&error));
0b7964b8 LP	144	goto finish;
	145	}
	146
	147	finish:
	148	if (m)
	149	dbus_message_unref(m);
	150
	151	if (reply)
	152	dbus_message_unref(reply);
	153
	154	dbus_error_free(&error);
	155	}
	156
	157	static void request_process(Server s, const struct init_request req) {
	158	assert(s);
	159	assert(req);
	160
	161	if (req->magic != INIT_MAGIC) {
	162	log_error("Got initctl request with invalid magic. Ignoring.");
	163	return;
	164	}
	165
	166	switch (req->cmd) {
	167
	168	case INIT_CMD_RUNLVL:
	169	if (!isprint(req->runlevel))
	170	log_error("Got invalid runlevel. Ignoring.");
	171	else
46e964c5 TG	172	switch (req->runlevel) {
	173
	174	/* we are async anyway, so just use kill for reexec/reload */
	175	case 'u':
	176	case 'U':
	177	if (kill(1, SIGTERM) < 0)
	178	log_error("kill() failed: %m");
f632a663 LP	179
	180	/* The bus connection will be
	181	* terminated if PID 1 is reexecuted,
	182	* hence let's just exit here, and
	183	* rely on that we'll be restarted on
	184	* the next request */
	185	s->quit = true;
46e964c5 TG	186	break;
	187
	188	case 'q':
	189	case 'Q':
	190	if (kill(1, SIGHUP) < 0)
	191	log_error("kill() failed: %m");
	192	break;
	193
	194	default:
	195	change_runlevel(s, req->runlevel);
	196	}
0b7964b8 LP	197	return;
	198
	199	case INIT_CMD_POWERFAIL:
	200	case INIT_CMD_POWERFAILNOW:
	201	case INIT_CMD_POWEROK:
	202	log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
	203	return;
	204
	205	case INIT_CMD_CHANGECONS:
	206	log_warning("Received console change initctl request. This is not implemented in systemd.");
	207	return;
	208
	209	case INIT_CMD_SETENV:
	210	case INIT_CMD_UNSETENV:
	211	log_warning("Received environment initctl request. This is not implemented in systemd.");
	212	return;
	213
	214	default:
	215	log_warning("Received unknown initctl request. Ignoring.");
	216	return;
	217	}
	218	}
	219
	220	static int fifo_process(Fifo *f) {
	221	ssize_t l;
	222
	223	assert(f);
	224
	225	errno = EIO;
	226	if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
	227
	228	if (errno == EAGAIN)
	229	return 0;
	230
	231	log_warning("Failed to read from fifo: %s", strerror(errno));
	232	return -1;
	233	}
	234
	235	f->bytes_read += l;
	236	assert(f->bytes_read <= sizeof(f->buffer));
	237
	238	if (f->bytes_read == sizeof(f->buffer)) {
	239	request_process(f->server, &f->buffer);
	240	f->bytes_read = 0;
	241	}
	242
	243	return 0;
	244	}
	245
	246	static void fifo_free(Fifo *f) {
	247	assert(f);
	248
	249	if (f->server) {
	250	assert(f->server->n_fifos > 0);
	251	f->server->n_fifos--;
	252	LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
	253	}
	254
	255	if (f->fd >= 0) {
	256	if (f->server)
	257	epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
	258
a16e1123	259	close_nointr_nofail(f->fd);
0b7964b8 LP	260	}
	261
	262	free(f);
	263	}
	264
0b7964b8 LP	265	static void server_done(Server *s) {
	266	assert(s);
	267
	268	while (s->fifos)
	269	fifo_free(s->fifos);
	270
	271	if (s->epoll_fd >= 0)
a16e1123	272	close_nointr_nofail(s->epoll_fd);
0b7964b8	273
fb1af5b0	274	if (s->bus) {
5d452f9c LP	275	dbus_connection_flush(s->bus);
	276	dbus_connection_close(s->bus);
	277	dbus_connection_unref(s->bus);
fb1af5b0	278	}
0b7964b8 LP	279	}
	280
	281	static int server_init(Server *s, unsigned n_sockets) {
	282	int r;
	283	unsigned i;
	284	DBusError error;
	285
	286	assert(s);
	287	assert(n_sockets > 0);
	288
	289	dbus_error_init(&error);
	290
	291	zero(*s);
	292
	293	if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
	294	r = -errno;
	295	log_error("Failed to create epoll object: %s", strerror(errno));
	296	goto fail;
	297	}
	298
	299	for (i = 0; i < n_sockets; i++) {
	300	struct epoll_event ev;
	301	Fifo *f;
7c394faa LP	302	int fd;
	303
	304	fd = SD_LISTEN_FDS_START+i;
	305
	306	if ((r = sd_is_fifo(fd, NULL)) < 0) {
	307	log_error("Failed to determine file descriptor type: %s", strerror(-r));
	308	goto fail;
	309	}
	310
	311	if (!r) {
	312	log_error("Wrong file descriptor type.");
	313	r = -EINVAL;
	314	goto fail;
	315	}
0b7964b8 LP	316
	317	if (!(f = new0(Fifo, 1))) {
	318	r = -ENOMEM;
	319	log_error("Failed to create fifo object: %s", strerror(errno));
	320	goto fail;
	321	}
	322
	323	f->fd = -1;
	324
	325	zero(ev);
	326	ev.events = EPOLLIN;
	327	ev.data.ptr = f;
7c394faa	328	if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
0b7964b8 LP	329	r = -errno;
	330	fifo_free(f);
	331	log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
	332	goto fail;
	333	}
	334
63983207	335	f->fd = fd;
0b7964b8 LP	336	LIST_PREPEND(Fifo, fifo, s->fifos, f);
	337	f->server = s;
	338	s->n_fifos ++;
	339	}
	340
b574246b	341	if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
4cf5d675	342	log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
0b7964b8 LP	343	goto fail;
	344	}
	345
	346	return 0;
	347
	348	fail:
	349	server_done(s);
	350
	351	dbus_error_free(&error);
	352	return r;
	353	}
	354
	355	static int process_event(Server s, struct epoll_event ev) {
	356	int r;
	357	Fifo *f;
	358
	359	assert(s);
	360
	361	if (!(ev->events & EPOLLIN)) {
	362	log_info("Got invalid event from epoll. (3)");
	363	return -EIO;
	364	}
	365
	366	f = (Fifo*) ev->data.ptr;
	367
	368	if ((r = fifo_process(f)) < 0) {
	369	log_info("Got error on fifo: %s", strerror(-r));
	370	fifo_free(f);
	371	return r;
	372	}
	373
	374	return 0;
	375	}
	376
	377	int main(int argc, char *argv[]) {
	378	Server server;
22f4096c	379	int r = EXIT_FAILURE, n;
8bfcc8ea	380
0ca3f374 LP	381	if (getppid() != 1) {
0ca3f374 LP	382	log_error("This program should be invoked by init only.");
22f4096c	383	return EXIT_FAILURE;
0ca3f374 LP	384	}
	385
	386	if (argc > 1) {
	387	log_error("This program does not take arguments.");
22f4096c	388	return EXIT_FAILURE;
0ca3f374 LP	389	}
0ca3f374 LP	390
8bfcc8ea LP	391	log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
8bfcc8ea LP	392	log_parse_environment();
2396fb04	393	log_open();
0b7964b8	394
4c12626c LP	395	umask(0022);
4c12626c LP	396
8bfcc8ea LP	397	if ((n = sd_listen_fds(true)) < 0) {
8bfcc8ea LP	398	log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
22f4096c	399	return EXIT_FAILURE;
8bfcc8ea LP	400	}
	401
	402	if (n <= 0 \|\| n > SERVER_FD_MAX) {
	403	log_error("No or too many file descriptors passed.");
22f4096c	404	return EXIT_FAILURE;
8bfcc8ea	405	}
0b7964b8	406
8bfcc8ea	407	if (server_init(&server, (unsigned) n) < 0)
22f4096c	408	return EXIT_FAILURE;
0b7964b8	409
cd6d0a45 LP	410	log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
cd6d0a45 LP	411
8c47c732 LP	412	sd_notify(false,
	413	"READY=1\n"
	414	"STATUS=Processing requests...");
	415
f632a663	416	while (!server.quit) {
0b7964b8 LP	417	struct epoll_event event;
	418	int k;
	419
	420	if ((k = epoll_wait(server.epoll_fd,
	421	&event, 1,
ef9eb0a8	422	TIMEOUT_MSEC)) < 0) {
0b7964b8 LP	423
	424	if (errno == EINTR)
	425	continue;
	426
	427	log_error("epoll_wait() failed: %s", strerror(errno));
	428	goto fail;
	429	}
	430
	431	if (k <= 0)
	432	break;
	433
e364ad06	434	if (process_event(&server, &event) < 0)
0b7964b8 LP	435	goto fail;
0b7964b8 LP	436	}
cd6d0a45	437
22f4096c	438	r = EXIT_SUCCESS;
0b7964b8	439
cd6d0a45 LP	440	log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
cd6d0a45 LP	441
0b7964b8	442	fail:
8c47c732 LP	443	sd_notify(false,
	444	"STATUS=Shutting down...");
	445
0b7964b8 LP	446	server_done(&server);
0b7964b8 LP	447
0b7964b8 LP	448	dbus_shutdown();
	449
	450	return r;
	451	}