[thirdparty/systemd.git] / src / systemd / sd-daemon.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#ifndef foosddaemonhfoo
#define foosddaemonhfoo

/***
  This file is part of systemd.

  Copyright 2013 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 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
  Lesser General Public License for more details.

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

#include <inttypes.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "_sd-common.h"

_SD_BEGIN_DECLARATIONS;

/*
  The following functionality is provided:

  - Support for logging with log levels on stderr
  - File descriptor passing for socket-based activation
  - Daemon startup and status notification
  - Detection of systemd boots

  See sd-daemon(3) for more information.
*/

/*
  Log levels for usage on stderr:

          fprintf(stderr, SD_NOTICE "Hello World!\n");

  This is similar to printk() usage in the kernel.
*/
#define SD_EMERG   "<0>"  /* system is unusable */
#define SD_ALERT   "<1>"  /* action must be taken immediately */
#define SD_CRIT    "<2>"  /* critical conditions */
#define SD_ERR     "<3>"  /* error conditions */
#define SD_WARNING "<4>"  /* warning conditions */
#define SD_NOTICE  "<5>"  /* normal but significant condition */
#define SD_INFO    "<6>"  /* informational */
#define SD_DEBUG   "<7>"  /* debug-level messages */

/* The first passed file descriptor is fd 3 */
#define SD_LISTEN_FDS_START 3

/*
  Returns how many file descriptors have been passed, or a negative
  errno code on failure. Optionally, removes the $LISTEN_FDS and
  $LISTEN_PID file descriptors from the environment (recommended, but
  problematic in threaded environments). If r is the return value of
  this function you'll find the file descriptors passed as fds
  SD_LISTEN_FDS_START to SD_LISTEN_FDS_START+r-1. Returns a negative
  errno style error code on failure. This function call ensures that
  the FD_CLOEXEC flag is set for the passed file descriptors, to make
  sure they are not passed on to child processes. If FD_CLOEXEC shall
  not be set, the caller needs to unset it after this call for all file
  descriptors that are used.

  See sd_listen_fds(3) for more information.
*/
int sd_listen_fds(int unset_environment);

int sd_listen_fds_with_names(int unset_environment, char ***names);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is a FIFO in the file system stored under the
  specified path, 0 otherwise. If path is NULL a path name check will
  not be done and the call only verifies if the file descriptor
  refers to a FIFO. Returns a negative errno style error code on
  failure.

  See sd_is_fifo(3) for more information.
*/
int sd_is_fifo(int fd, const char *path);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is a special character device on the file
  system stored under the specified path, 0 otherwise.
  If path is NULL a path name check will not be done and the call
  only verifies if the file descriptor refers to a special character.
  Returns a negative errno style error code on failure.

  See sd_is_special(3) for more information.
*/
int sd_is_special(int fd, const char *path);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is a socket of the specified family (AF_INET,
  ...) and type (SOCK_DGRAM, SOCK_STREAM, ...), 0 otherwise. If
  family is 0 a socket family check will not be done. If type is 0 a
  socket type check will not be done and the call only verifies if
  the file descriptor refers to a socket. If listening is > 0 it is
  verified that the socket is in listening mode. (i.e. listen() has
  been called) If listening is == 0 it is verified that the socket is
  not in listening mode. If listening is < 0 no listening mode check
  is done. Returns a negative errno style error code on failure.

  See sd_is_socket(3) for more information.
*/
int sd_is_socket(int fd, int family, int type, int listening);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is an Internet socket, of the specified family
  (either AF_INET or AF_INET6) and the specified type (SOCK_DGRAM,
  SOCK_STREAM, ...), 0 otherwise. If version is 0 a protocol version
  check is not done. If type is 0 a socket type check will not be
  done. If port is 0 a socket port check will not be done. The
  listening flag is used the same way as in sd_is_socket(). Returns a
  negative errno style error code on failure.

  See sd_is_socket_inet(3) for more information.
*/
int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if the
  file descriptor is an Internet socket of the specified type
  (SOCK_DGRAM, SOCK_STREAM, ...), and if the address of the socket is
  the same as the address specified by addr. The listening flag is used
  the same way as in sd_is_socket(). Returns a negative errno style
  error code on failure.

  See sd_is_socket_sockaddr(3) for more information.
*/
int sd_is_socket_sockaddr(int fd, int type, const struct sockaddr* addr, unsigned addr_len, int listening);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is an AF_UNIX socket of the specified type
  (SOCK_DGRAM, SOCK_STREAM, ...) and path, 0 otherwise. If type is 0
  a socket type check will not be done. If path is NULL a socket path
  check will not be done. For normal AF_UNIX sockets set length to
  0. For abstract namespace sockets set length to the length of the
  socket name (including the initial 0 byte), and pass the full
  socket path in path (including the initial 0 byte). The listening
  flag is used the same way as in sd_is_socket(). Returns a negative
  errno style error code on failure.

  See sd_is_socket_unix(3) for more information.
*/
int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);

/*
  Helper call for identifying a passed file descriptor. Returns 1 if
  the file descriptor is a POSIX Message Queue of the specified name,
  0 otherwise. If path is NULL a message queue name check is not
  done. Returns a negative errno style error code on failure.

  See sd_is_mq(3) for more information.
*/
int sd_is_mq(int fd, const char *path);

/*
  Informs systemd about changed daemon state. This takes a number of
  newline separated environment-style variable assignments in a
  string. The following variables are known:

     MAINPID=...  The main PID of a daemon, in case systemd did not
                  fork off the process itself. Example: "MAINPID=4711"

     READY=1      Tells systemd that daemon startup or daemon reload
                  is finished (only relevant for services of Type=notify).
                  The passed argument is a boolean "1" or "0". Since there
                  is little value in signaling non-readiness the only
                  value daemons should send is "READY=1".

     RELOADING=1  Tell systemd that the daemon began reloading its
                  configuration. When the configuration has been
                  reloaded completely, READY=1 should be sent to inform
                  systemd about this.

     STOPPING=1   Tells systemd that the daemon is about to go down.

     STATUS=...   Passes a single-line status string back to systemd
                  that describes the daemon state. This is free-form
                  and can be used for various purposes: general state
                  feedback, fsck-like programs could pass completion
                  percentages and failing programs could pass a human
                  readable error message. Example: "STATUS=Completed
                  66% of file system check..."

     ERRNO=...    If a daemon fails, the errno-style error code,
                  formatted as string. Example: "ERRNO=2" for ENOENT.

     BUSERROR=... If a daemon fails, the D-Bus error-style error
                  code. Example: "BUSERROR=org.freedesktop.DBus.Error.TimedOut"

     WATCHDOG=1   Tells systemd to update the watchdog timestamp.
                  Services using this feature should do this in
                  regular intervals. A watchdog framework can use the
                  timestamps to detect failed services. Also see
                  sd_watchdog_enabled() below.

     WATCHDOG_USEC=...
                  Reset watchdog_usec value during runtime.
                  To reset watchdog_usec value, start the service again.
                  Example: "WATCHDOG_USEC=20000000"

     FDSTORE=1    Store the file descriptors passed along with the
                  message in the per-service file descriptor store,
                  and pass them to the main process again on next
                  invocation. This variable is only supported with
                  sd_pid_notify_with_fds().

     FDSTOREREMOVE=1
                  Remove one or more file descriptors from the file
                  descriptor store, identified by the name specified
                  in FDNAME=, see below.

     FDNAME=      A name to assign to new file descriptors stored in the
                  file descriptor store, or the name of the file descriptors
                  to remove in case of FDSTOREREMOVE=1.

  Daemons can choose to send additional variables. However, it is
  recommended to prefix variable names not listed above with X_.

  Returns a negative errno-style error code on failure. Returns > 0
  if systemd could be notified, 0 if it couldn't possibly because
  systemd is not running.

  Example: When a daemon finished starting up, it could issue this
  call to notify systemd about it:

     sd_notify(0, "READY=1");

  See sd_notifyf() for more complete examples.

  See sd_notify(3) for more information.
*/
int sd_notify(int unset_environment, const char *state);

/*
  Similar to sd_notify() but takes a format string.

  Example 1: A daemon could send the following after initialization:

     sd_notifyf(0, "READY=1\n"
                   "STATUS=Processing requests...\n"
                   "MAINPID=%lu",
                   (unsigned long) getpid());

  Example 2: A daemon could send the following shortly before
  exiting, on failure:

     sd_notifyf(0, "STATUS=Failed to start up: %s\n"
                   "ERRNO=%i",
                   strerror(errno),
                   errno);

  See sd_notifyf(3) for more information.
*/
int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_(2,3);

/*
  Similar to sd_notify(), but send the message on behalf of another
  process, if the appropriate permissions are available.
*/
int sd_pid_notify(pid_t pid, int unset_environment, const char *state);

/*
  Similar to sd_notifyf(), but send the message on behalf of another
  process, if the appropriate permissions are available.
*/
int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) _sd_printf_(3,4);

/*
  Similar to sd_pid_notify(), but also passes the specified fd array
  to the service manager for storage. This is particularly useful for
  FDSTORE=1 messages.
*/
int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char *state, const int *fds, unsigned n_fds);

/*
  Returns > 0 if the system was booted with systemd. Returns < 0 on
  error. Returns 0 if the system was not booted with systemd. Note
  that all of the functions above handle non-systemd boots just
  fine. You should NOT protect them with a call to this function. Also
  note that this function checks whether the system, not the user
  session is controlled by systemd. However the functions above work
  for both user and system services.

  See sd_booted(3) for more information.
*/
int sd_booted(void);

/*
  Returns > 0 if the service manager expects watchdog keep-alive
  events to be sent regularly via sd_notify(0, "WATCHDOG=1"). Returns
  0 if it does not expect this. If the usec argument is non-NULL
  returns the watchdog timeout in µs after which the service manager
  will act on a process that has not sent a watchdog keep alive
  message. This function is useful to implement services that
  recognize automatically if they are being run under supervision of
  systemd with WatchdogSec= set. It is recommended for clients to
  generate keep-alive pings via sd_notify(0, "WATCHDOG=1") every half
  of the returned time.

  See sd_watchdog_enabled(3) for more information.
*/
int sd_watchdog_enabled(int unset_environment, uint64_t *usec);

_SD_END_DECLARATIONS;

#endif
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
abbbea81 LP	2	#ifndef foosddaemonhfoo
	3	#define foosddaemonhfoo
	4
	5	/***
952d1536 KS	6	This file is part of systemd.
	7
	8	Copyright 2013 Lennart Poettering
	9
	10	systemd is free software; you can redistribute it and/or modify it
	11	under the terms of the GNU Lesser General Public License as published by
	12	the Free Software Foundation; either version 2.1 of the License, or
	13	(at your option) any later version.
	14
	15	systemd is distributed in the hope that it will be useful, but
	16	WITHOUT ANY WARRANTY; without even the implied warranty of
	17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	Lesser General Public License for more details.
	19
	20	You should have received a copy of the GNU Lesser General Public License
	21	along with systemd; If not, see <http://www.gnu.org/licenses/>.
abbbea81 LP	22	***/
abbbea81 LP	23
7c394faa	24	#include <inttypes.h>
71d35b6b	25	#include <sys/types.h>
f6f372d2	26	#include <sys/socket.h>
7c394faa	27
0ebee881	28	#include "_sd-common.h"
8c47c732	29
0ebee881	30	_SD_BEGIN_DECLARATIONS;
40473a70	31
0ebee881	32	/*
40473a70 LP	33	The following functionality is provided:
	34
	35	- Support for logging with log levels on stderr
	36	- File descriptor passing for socket-based activation
	37	- Daemon startup and status notification
	38	- Detection of systemd boots
	39
cb07866b	40	See sd-daemon(3) for more information.
40473a70 LP	41	*/
40473a70 LP	42
abbbea81 LP	43	/*
	44	Log levels for usage on stderr:
	45
f9378423	46	fprintf(stderr, SD_NOTICE "Hello World!\n");
abbbea81 LP	47
	48	This is similar to printk() usage in the kernel.
	49	*/
abbbea81 LP	50	#define SD_EMERG "<0>" /* system is unusable */
	51	#define SD_ALERT "<1>" /* action must be taken immediately */
	52	#define SD_CRIT "<2>" /* critical conditions */
	53	#define SD_ERR "<3>" /* error conditions */
	54	#define SD_WARNING "<4>" /* warning conditions */
	55	#define SD_NOTICE "<5>" /* normal but significant condition */
	56	#define SD_INFO "<6>" /* informational */
	57	#define SD_DEBUG "<7>" /* debug-level messages */
	58
	59	/* The first passed file descriptor is fd 3 */
	60	#define SD_LISTEN_FDS_START 3
	61
40473a70 LP	62	/*
	63	Returns how many file descriptors have been passed, or a negative
	64	errno code on failure. Optionally, removes the $LISTEN_FDS and
	65	$LISTEN_PID file descriptors from the environment (recommended, but
	66	problematic in threaded environments). If r is the return value of
	67	this function you'll find the file descriptors passed as fds
	68	SD_LISTEN_FDS_START to SD_LISTEN_FDS_START+r-1. Returns a negative
	69	errno style error code on failure. This function call ensures that
	70	the FD_CLOEXEC flag is set for the passed file descriptors, to make
	71	sure they are not passed on to child processes. If FD_CLOEXEC shall
	72	not be set, the caller needs to unset it after this call for all file
	73	descriptors that are used.
daaa7e5a LP	74
daaa7e5a LP	75	See sd_listen_fds(3) for more information.
40473a70	76	*/
b136daf5	77	int sd_listen_fds(int unset_environment);
40473a70	78
8dd4c05b LP	79	int sd_listen_fds_with_names(int unset_environment, char ***names);
8dd4c05b LP	80
40473a70 LP	81	/*
	82	Helper call for identifying a passed file descriptor. Returns 1 if
	83	the file descriptor is a FIFO in the file system stored under the
	84	specified path, 0 otherwise. If path is NULL a path name check will
	85	not be done and the call only verifies if the file descriptor
	86	refers to a FIFO. Returns a negative errno style error code on
	87	failure.
daaa7e5a LP	88
daaa7e5a LP	89	See sd_is_fifo(3) for more information.
40473a70	90	*/
b136daf5	91	int sd_is_fifo(int fd, const char *path);
40473a70	92
4160ec67 WD	93	/*
	94	Helper call for identifying a passed file descriptor. Returns 1 if
	95	the file descriptor is a special character device on the file
	96	system stored under the specified path, 0 otherwise.
	97	If path is NULL a path name check will not be done and the call
	98	only verifies if the file descriptor refers to a special character.
	99	Returns a negative errno style error code on failure.
	100
	101	See sd_is_special(3) for more information.
	102	*/
	103	int sd_is_special(int fd, const char *path);
	104
40473a70 LP	105	/*
	106	Helper call for identifying a passed file descriptor. Returns 1 if
	107	the file descriptor is a socket of the specified family (AF_INET,
	108	...) and type (SOCK_DGRAM, SOCK_STREAM, ...), 0 otherwise. If
	109	family is 0 a socket family check will not be done. If type is 0 a
	110	socket type check will not be done and the call only verifies if
	111	the file descriptor refers to a socket. If listening is > 0 it is
	112	verified that the socket is in listening mode. (i.e. listen() has
	113	been called) If listening is == 0 it is verified that the socket is
	114	not in listening mode. If listening is < 0 no listening mode check
	115	is done. Returns a negative errno style error code on failure.
daaa7e5a LP	116
daaa7e5a LP	117	See sd_is_socket(3) for more information.
40473a70	118	*/
b136daf5	119	int sd_is_socket(int fd, int family, int type, int listening);
40473a70 LP	120
	121	/*
	122	Helper call for identifying a passed file descriptor. Returns 1 if
	123	the file descriptor is an Internet socket, of the specified family
	124	(either AF_INET or AF_INET6) and the specified type (SOCK_DGRAM,
	125	SOCK_STREAM, ...), 0 otherwise. If version is 0 a protocol version
	126	check is not done. If type is 0 a socket type check will not be
	127	done. If port is 0 a socket port check will not be done. The
	128	listening flag is used the same way as in sd_is_socket(). Returns a
	129	negative errno style error code on failure.
daaa7e5a LP	130
daaa7e5a LP	131	See sd_is_socket_inet(3) for more information.
40473a70	132	*/
b136daf5	133	int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port);
40473a70	134
f6f372d2 ZJS	135	/*
	136	Helper call for identifying a passed file descriptor. Returns 1 if the
	137	file descriptor is an Internet socket of the specified type
	138	(SOCK_DGRAM, SOCK_STREAM, ...), and if the address of the socket is
	139	the same as the address specified by addr. The listening flag is used
	140	the same way as in sd_is_socket(). Returns a negative errno style
	141	error code on failure.
	142
	143	See sd_is_socket_sockaddr(3) for more information.
	144	*/
	145	int sd_is_socket_sockaddr(int fd, int type, const struct sockaddr* addr, unsigned addr_len, int listening);
	146
40473a70 LP	147	/*
	148	Helper call for identifying a passed file descriptor. Returns 1 if
	149	the file descriptor is an AF_UNIX socket of the specified type
	150	(SOCK_DGRAM, SOCK_STREAM, ...) and path, 0 otherwise. If type is 0
	151	a socket type check will not be done. If path is NULL a socket path
	152	check will not be done. For normal AF_UNIX sockets set length to
	153	0. For abstract namespace sockets set length to the length of the
	154	socket name (including the initial 0 byte), and pass the full
	155	socket path in path (including the initial 0 byte). The listening
	156	flag is used the same way as in sd_is_socket(). Returns a negative
	157	errno style error code on failure.
daaa7e5a LP	158
daaa7e5a LP	159	See sd_is_socket_unix(3) for more information.
40473a70	160	*/
b136daf5	161	int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);
40473a70	162
916abb21 LP	163	/*
	164	Helper call for identifying a passed file descriptor. Returns 1 if
	165	the file descriptor is a POSIX Message Queue of the specified name,
	166	0 otherwise. If path is NULL a message queue name check is not
	167	done. Returns a negative errno style error code on failure.
09812eb7 LP	168
09812eb7 LP	169	See sd_is_mq(3) for more information.
916abb21	170	*/
b136daf5	171	int sd_is_mq(int fd, const char *path);
916abb21	172
40473a70	173	/*
f9378423	174	Informs systemd about changed daemon state. This takes a number of
96d4ce01	175	newline separated environment-style variable assignments in a
f9378423	176	string. The following variables are known:
40473a70	177
cc2b7b11 LP	178	MAINPID=... The main PID of a daemon, in case systemd did not
	179	fork off the process itself. Example: "MAINPID=4711"
	180
	181	READY=1 Tells systemd that daemon startup or daemon reload
	182	is finished (only relevant for services of Type=notify).
	183	The passed argument is a boolean "1" or "0". Since there
	184	is little value in signaling non-readiness the only
40473a70 LP	185	value daemons should send is "READY=1".
40473a70 LP	186
cc2b7b11 LP	187	RELOADING=1 Tell systemd that the daemon began reloading its
	188	configuration. When the configuration has been
	189	reloaded completely, READY=1 should be sent to inform
	190	systemd about this.
	191
	192	STOPPING=1 Tells systemd that the daemon is about to go down.
	193
40473a70	194	STATUS=... Passes a single-line status string back to systemd
4a6970c5	195	that describes the daemon state. This is free-form
40473a70 LP	196	and can be used for various purposes: general state
	197	feedback, fsck-like programs could pass completion
	198	percentages and failing programs could pass a human
	199	readable error message. Example: "STATUS=Completed
	200	66% of file system check..."
	201
	202	ERRNO=... If a daemon fails, the errno-style error code,
	203	formatted as string. Example: "ERRNO=2" for ENOENT.
	204
	205	BUSERROR=... If a daemon fails, the D-Bus error-style error
	206	code. Example: "BUSERROR=org.freedesktop.DBus.Error.TimedOut"
	207
a6927d7f MO	208	WATCHDOG=1 Tells systemd to update the watchdog timestamp.
	209	Services using this feature should do this in
	210	regular intervals. A watchdog framework can use the
09812eb7 LP	211	timestamps to detect failed services. Also see
09812eb7 LP	212	sd_watchdog_enabled() below.
a6927d7f	213
c45d11cb LP	214	WATCHDOG_USEC=...
	215	Reset watchdog_usec value during runtime.
	216	To reset watchdog_usec value, start the service again.
	217	Example: "WATCHDOG_USEC=20000000"
	218
a354329f LP	219	FDSTORE=1 Store the file descriptors passed along with the
	220	message in the per-service file descriptor store,
	221	and pass them to the main process again on next
	222	invocation. This variable is only supported with
	223	sd_pid_notify_with_fds().
	224
e78ee06d LP	225	FDSTOREREMOVE=1
	226	Remove one or more file descriptors from the file
	227	descriptor store, identified by the name specified
	228	in FDNAME=, see below.
	229
	230	FDNAME= A name to assign to new file descriptors stored in the
	231	file descriptor store, or the name of the file descriptors
	232	to remove in case of FDSTOREREMOVE=1.
	233
f9378423	234	Daemons can choose to send additional variables. However, it is
35b8ca3a	235	recommended to prefix variable names not listed above with X_.
40473a70 LP	236
	237	Returns a negative errno-style error code on failure. Returns > 0
	238	if systemd could be notified, 0 if it couldn't possibly because
	239	systemd is not running.
	240
	241	Example: When a daemon finished starting up, it could issue this
	242	call to notify systemd about it:
	243
	244	sd_notify(0, "READY=1");
	245
	246	See sd_notifyf() for more complete examples.
daaa7e5a LP	247
daaa7e5a LP	248	See sd_notify(3) for more information.
40473a70	249	*/
b136daf5	250	int sd_notify(int unset_environment, const char *state);
40473a70 LP	251
	252	/*
	253	Similar to sd_notify() but takes a format string.
	254
	255	Example 1: A daemon could send the following after initialization:
	256
	257	sd_notifyf(0, "READY=1\n"
	258	"STATUS=Processing requests...\n"
	259	"MAINPID=%lu",
	260	(unsigned long) getpid());
	261
	262	Example 2: A daemon could send the following shortly before
	263	exiting, on failure:
	264
	265	sd_notifyf(0, "STATUS=Failed to start up: %s\n"
	266	"ERRNO=%i",
	267	strerror(errno),
	268	errno);
daaa7e5a LP	269
daaa7e5a LP	270	See sd_notifyf(3) for more information.
40473a70	271	*/
0ebee881	272	int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_(2,3);
40473a70	273
be8f4e9e LP	274	/*
	275	Similar to sd_notify(), but send the message on behalf of another
	276	process, if the appropriate permissions are available.
	277	*/
	278	int sd_pid_notify(pid_t pid, int unset_environment, const char *state);
	279
	280	/*
	281	Similar to sd_notifyf(), but send the message on behalf of another
	282	process, if the appropriate permissions are available.
	283	*/
	284	int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) _sd_printf_(3,4);
	285
a354329f LP	286	/*
	287	Similar to sd_pid_notify(), but also passes the specified fd array
	288	to the service manager for storage. This is particularly useful for
	289	FDSTORE=1 messages.
	290	*/
	291	int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char state, const int fds, unsigned n_fds);
	292
40473a70 LP	293	/*
	294	Returns > 0 if the system was booted with systemd. Returns < 0 on
	295	error. Returns 0 if the system was not booted with systemd. Note
	296	that all of the functions above handle non-systemd boots just
	297	fine. You should NOT protect them with a call to this function. Also
	298	note that this function checks whether the system, not the user
	299	session is controlled by systemd. However the functions above work
af2d49f7	300	for both user and system services.
daaa7e5a LP	301
daaa7e5a LP	302	See sd_booted(3) for more information.
40473a70	303	*/
b136daf5	304	int sd_booted(void);
8c47c732	305
09812eb7 LP	306	/*
	307	Returns > 0 if the service manager expects watchdog keep-alive
	308	events to be sent regularly via sd_notify(0, "WATCHDOG=1"). Returns
	309	0 if it does not expect this. If the usec argument is non-NULL
	310	returns the watchdog timeout in µs after which the service manager
	311	will act on a process that has not sent a watchdog keep alive
	312	message. This function is useful to implement services that
	313	recognize automatically if they are being run under supervision of
	314	systemd with WatchdogSec= set. It is recommended for clients to
	315	generate keep-alive pings via sd_notify(0, "WATCHDOG=1") every half
	316	of the returned time.
	317
	318	See sd_watchdog_enabled(3) for more information.
	319	*/
	320	int sd_watchdog_enabled(int unset_environment, uint64_t *usec);
	321
0ebee881	322	_SD_END_DECLARATIONS;
8c47c732	323
abbbea81	324	#endif