2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; only
8 * version 2.1 of the License.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include <sys/socket.h>
27 #include <sys/types.h>
34 #include <lttng/ust-ctl.h>
37 #include <lttng/ust-error.h>
38 #include <lttng/ust-events.h>
39 #include <usterr-signal-safe.h>
41 #include "../liblttng-ust/compat.h"
43 #define USTCOMM_CODE_OFFSET(code) \
44 (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1))
46 #define USTCOMM_MAX_SEND_FDS 4
49 * Human readable error message.
51 static const char *ustcomm_readable_code
[] = {
52 [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK
) ] = "Success",
53 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR
) ] = "Unknown error",
54 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT
) ] = "No entry",
55 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST
) ] = "Object already exists",
56 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL
) ] = "Invalid argument",
57 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM
) ] = "Permission denied",
58 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS
) ] = "Not implemented",
59 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING
) ] = "Process is exiting",
61 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC
) ] = "Invalid magic number",
62 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE
) ] = "Invalid socket type",
63 [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR
) ] = "Unsupported major version",
69 * Receives positive error value.
70 * Return ptr to string representing a human readable
71 * error code from the ustcomm_return_code enum.
73 const char *lttng_ust_strerror(int code
)
75 if (code
== LTTNG_UST_OK
)
76 return ustcomm_readable_code
[USTCOMM_CODE_OFFSET(code
)];
77 if (code
< LTTNG_UST_ERR
)
78 return strerror(code
);
79 if (code
>= LTTNG_UST_ERR_NR
)
81 return ustcomm_readable_code
[USTCOMM_CODE_OFFSET(code
)];
85 * ustcomm_connect_unix_sock
87 * Connect to unix socket using the path name.
89 int ustcomm_connect_unix_sock(const char *pathname
)
91 struct sockaddr_un sun
;
95 * libust threads require the close-on-exec flag for all
96 * resources so it does not leak file descriptors upon exec.
98 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
104 ret
= fcntl(fd
, F_SETFD
, FD_CLOEXEC
);
111 memset(&sun
, 0, sizeof(sun
));
112 sun
.sun_family
= AF_UNIX
;
113 strncpy(sun
.sun_path
, pathname
, sizeof(sun
.sun_path
));
114 sun
.sun_path
[sizeof(sun
.sun_path
) - 1] = '\0';
116 ret
= connect(fd
, (struct sockaddr
*) &sun
, sizeof(sun
));
119 * Don't print message on connect ENOENT error, because
120 * connect is used in normal execution to detect if
121 * sessiond is alive. ENOENT is when the unix socket
122 * file does not exist, and ECONNREFUSED is when the
123 * file exists but no sessiond is listening.
125 if (errno
!= ECONNREFUSED
&& errno
!= ECONNRESET
126 && errno
!= ENOENT
&& errno
!= EACCES
)
129 if (ret
== -ECONNREFUSED
|| ret
== -ECONNRESET
)
141 closeret
= close(fd
);
150 * ustcomm_accept_unix_sock
152 * Do an accept(2) on the sock and return the
153 * new file descriptor. The socket MUST be bind(2) before.
155 int ustcomm_accept_unix_sock(int sock
)
158 struct sockaddr_un sun
;
162 new_fd
= accept(sock
, (struct sockaddr
*) &sun
, &len
);
164 if (errno
!= ECONNABORTED
)
167 if (new_fd
== -ECONNABORTED
)
174 * ustcomm_create_unix_sock
176 * Creates a AF_UNIX local socket using pathname
177 * bind the socket upon creation and return the fd.
179 int ustcomm_create_unix_sock(const char *pathname
)
181 struct sockaddr_un sun
;
184 /* Create server socket */
185 if ((fd
= socket(PF_UNIX
, SOCK_STREAM
, 0)) < 0) {
191 memset(&sun
, 0, sizeof(sun
));
192 sun
.sun_family
= AF_UNIX
;
193 strncpy(sun
.sun_path
, pathname
, sizeof(sun
.sun_path
));
194 sun
.sun_path
[sizeof(sun
.sun_path
) - 1] = '\0';
196 /* Unlink the old file if present */
197 (void) unlink(pathname
);
198 ret
= bind(fd
, (struct sockaddr
*) &sun
, sizeof(sun
));
211 closeret
= close(fd
);
221 * ustcomm_listen_unix_sock
223 * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
225 int ustcomm_listen_unix_sock(int sock
)
229 ret
= listen(sock
, LTTNG_UST_COMM_MAX_LISTEN
);
239 * ustcomm_close_unix_sock
241 * Shutdown cleanly a unix socket.
243 int ustcomm_close_unix_sock(int sock
)
257 * ustcomm_recv_unix_sock
259 * Receive data of size len in put that data into
260 * the buf param. Using recvmsg API.
261 * Return the size of received data.
262 * Return 0 on orderly shutdown.
264 ssize_t
ustcomm_recv_unix_sock(int sock
, void *buf
, size_t len
)
271 memset(&msg
, 0, sizeof(msg
));
273 iov
[0].iov_base
= buf
;
274 iov
[0].iov_len
= len
;
279 len_last
= iov
[0].iov_len
;
280 ret
= recvmsg(sock
, &msg
, 0);
282 iov
[0].iov_base
+= ret
;
283 iov
[0].iov_len
-= ret
;
284 assert(ret
<= len_last
);
286 } while ((ret
> 0 && ret
< len_last
) || (ret
< 0 && errno
== EINTR
));
291 if (errno
!= EPIPE
&& errno
!= ECONNRESET
&& errno
!= ECONNREFUSED
)
294 if (ret
== -ECONNRESET
|| ret
== -ECONNREFUSED
)
297 shutret
= shutdown(sock
, SHUT_RDWR
);
299 ERR("Socket shutdown error");
300 } else if (ret
> 0) {
303 /* ret = 0 means an orderly shutdown. */
309 * ustcomm_send_unix_sock
311 * Send buf data of size len. Using sendmsg API.
312 * Return the size of sent data.
314 ssize_t
ustcomm_send_unix_sock(int sock
, const void *buf
, size_t len
)
320 memset(&msg
, 0, sizeof(msg
));
322 iov
[0].iov_base
= (void *) buf
;
323 iov
[0].iov_len
= len
;
328 * Using the MSG_NOSIGNAL when sending data from sessiond to
329 * libust, so libust does not receive an unhandled SIGPIPE or
330 * SIGURG. The sessiond receiver side can be made more resilient
331 * by ignoring SIGPIPE, but we don't have this luxury on the
335 ret
= sendmsg(sock
, &msg
, MSG_NOSIGNAL
);
336 } while (ret
< 0 && errno
== EINTR
);
341 if (errno
!= EPIPE
&& errno
!= ECONNRESET
)
344 if (ret
== -ECONNRESET
)
347 shutret
= shutdown(sock
, SHUT_RDWR
);
349 ERR("Socket shutdown error");
356 * Send a message accompanied by fd(s) over a unix socket.
358 * Returns the size of data sent, or negative error value.
360 ssize_t
ustcomm_send_fds_unix_sock(int sock
, int *fds
, size_t nb_fd
)
363 struct cmsghdr
*cmptr
;
366 unsigned int sizeof_fds
= nb_fd
* sizeof(int);
367 char tmp
[CMSG_SPACE(sizeof_fds
)];
370 memset(&msg
, 0, sizeof(msg
));
371 memset(tmp
, 0, CMSG_SPACE(sizeof_fds
) * sizeof(char));
373 if (nb_fd
> USTCOMM_MAX_SEND_FDS
)
376 msg
.msg_control
= (caddr_t
)tmp
;
377 msg
.msg_controllen
= CMSG_LEN(sizeof_fds
);
379 cmptr
= CMSG_FIRSTHDR(&msg
);
380 cmptr
->cmsg_level
= SOL_SOCKET
;
381 cmptr
->cmsg_type
= SCM_RIGHTS
;
382 cmptr
->cmsg_len
= CMSG_LEN(sizeof_fds
);
383 memcpy(CMSG_DATA(cmptr
), fds
, sizeof_fds
);
384 /* Sum of the length of all control messages in the buffer: */
385 msg
.msg_controllen
= cmptr
->cmsg_len
;
387 iov
[0].iov_base
= &dummy
;
393 ret
= sendmsg(sock
, &msg
, MSG_NOSIGNAL
);
394 } while (ret
< 0 && errno
== EINTR
);
397 * We consider EPIPE and ECONNRESET as expected.
399 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
403 if (ret
== -ECONNRESET
)
410 * Recv a message accompanied by fd(s) from a unix socket.
412 * Returns the size of received data, or negative error value.
414 * Expect at most "nb_fd" file descriptors. Returns the number of fd
415 * actually received in nb_fd.
416 * Returns -EPIPE on orderly shutdown.
418 ssize_t
ustcomm_recv_fds_unix_sock(int sock
, int *fds
, size_t nb_fd
)
422 struct cmsghdr
*cmsg
;
423 size_t sizeof_fds
= nb_fd
* sizeof(int);
424 char recv_fd
[CMSG_SPACE(sizeof_fds
)];
428 memset(&msg
, 0, sizeof(msg
));
430 /* Prepare to receive the structures */
431 iov
[0].iov_base
= &dummy
;
435 msg
.msg_control
= recv_fd
;
436 msg
.msg_controllen
= sizeof(recv_fd
);
439 ret
= recvmsg(sock
, &msg
, 0);
440 } while (ret
< 0 && errno
== EINTR
);
442 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
443 PERROR("recvmsg fds");
446 if (ret
== -ECONNRESET
)
451 /* orderly shutdown */
456 ERR("Error: Received %zd bytes, expected %d\n",
460 if (msg
.msg_flags
& MSG_CTRUNC
) {
461 ERR("Error: Control message truncated.\n");
465 cmsg
= CMSG_FIRSTHDR(&msg
);
467 ERR("Error: Invalid control message header\n");
471 if (cmsg
->cmsg_level
!= SOL_SOCKET
|| cmsg
->cmsg_type
!= SCM_RIGHTS
) {
472 ERR("Didn't received any fd\n");
476 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof_fds
)) {
477 ERR("Error: Received %zu bytes of ancillary data, expected %zu\n",
478 (size_t) cmsg
->cmsg_len
, (size_t) CMSG_LEN(sizeof_fds
));
482 memcpy(fds
, CMSG_DATA(cmsg
), sizeof_fds
);
488 int ustcomm_send_app_msg(int sock
, struct ustcomm_ust_msg
*lum
)
492 len
= ustcomm_send_unix_sock(sock
, lum
, sizeof(*lum
));
500 ERR("incorrect message size: %zd\n", len
);
507 int ustcomm_recv_app_reply(int sock
, struct ustcomm_ust_reply
*lur
,
508 uint32_t expected_handle
, uint32_t expected_cmd
)
512 memset(lur
, 0, sizeof(*lur
));
513 len
= ustcomm_recv_unix_sock(sock
, lur
, sizeof(*lur
));
515 case 0: /* orderly shutdown */
521 if (lur
->handle
!= expected_handle
) {
522 ERR("Unexpected result message handle: "
523 "expected: %u vs received: %u\n",
524 expected_handle
, lur
->handle
);
527 if (lur
->cmd
!= expected_cmd
) {
528 ERR("Unexpected result message command "
529 "expected: %u vs received: %u\n",
530 expected_cmd
, lur
->cmd
);
536 return lur
->ret_code
;
541 ERR("incorrect message size: %zd\n", len
);
547 int ustcomm_send_app_cmd(int sock
,
548 struct ustcomm_ust_msg
*lum
,
549 struct ustcomm_ust_reply
*lur
)
553 ret
= ustcomm_send_app_msg(sock
, lum
);
556 ret
= ustcomm_recv_app_reply(sock
, lur
, lum
->handle
, lum
->cmd
);
563 * chan_data is allocated internally if this function returns the
566 ssize_t
ustcomm_recv_channel_from_sessiond(int sock
,
567 void **_chan_data
, uint64_t var_len
,
574 if (var_len
> LTTNG_UST_CHANNEL_DATA_MAX_LEN
) {
578 /* Receive variable length data */
579 chan_data
= zmalloc(var_len
);
584 len
= ustcomm_recv_unix_sock(sock
, chan_data
, var_len
);
585 if (len
!= var_len
) {
589 nr_fd
= ustcomm_recv_fds_unix_sock(sock
, &wakeup_fd
, 1);
599 *_wakeup_fd
= wakeup_fd
;
600 *_chan_data
= chan_data
;
610 int ustcomm_recv_stream_from_sessiond(int sock
,
611 uint64_t *memory_map_size
,
612 int *shm_fd
, int *wakeup_fd
)
618 /* recv shm fd and wakeup fd */
619 len
= ustcomm_recv_fds_unix_sock(sock
, fds
, 2);
638 * Returns 0 on success, negative error value on error.
640 int ustcomm_send_reg_msg(int sock
,
641 enum ustctl_socket_type type
,
642 uint32_t bits_per_long
,
643 uint32_t uint8_t_alignment
,
644 uint32_t uint16_t_alignment
,
645 uint32_t uint32_t_alignment
,
646 uint32_t uint64_t_alignment
,
647 uint32_t long_alignment
)
650 struct ustctl_reg_msg reg_msg
;
652 reg_msg
.magic
= LTTNG_UST_COMM_MAGIC
;
653 reg_msg
.major
= LTTNG_UST_ABI_MAJOR_VERSION
;
654 reg_msg
.minor
= LTTNG_UST_ABI_MINOR_VERSION
;
655 reg_msg
.pid
= getpid();
656 reg_msg
.ppid
= getppid();
657 reg_msg
.uid
= getuid();
658 reg_msg
.gid
= getgid();
659 reg_msg
.bits_per_long
= bits_per_long
;
660 reg_msg
.uint8_t_alignment
= uint8_t_alignment
;
661 reg_msg
.uint16_t_alignment
= uint16_t_alignment
;
662 reg_msg
.uint32_t_alignment
= uint32_t_alignment
;
663 reg_msg
.uint64_t_alignment
= uint64_t_alignment
;
664 reg_msg
.long_alignment
= long_alignment
;
665 reg_msg
.socket_type
= type
;
666 lttng_ust_getprocname(reg_msg
.name
);
667 memset(reg_msg
.padding
, 0, sizeof(reg_msg
.padding
));
669 len
= ustcomm_send_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
670 if (len
> 0 && len
!= sizeof(reg_msg
))
678 int serialize_string_encoding(enum ustctl_string_encodings
*ue
,
679 enum lttng_string_encodings le
)
682 case lttng_encode_none
:
683 *ue
= ustctl_encode_none
;
685 case lttng_encode_UTF8
:
686 *ue
= ustctl_encode_UTF8
;
688 case lttng_encode_ASCII
:
689 *ue
= ustctl_encode_ASCII
;
698 int serialize_basic_type(enum ustctl_abstract_types
*uatype
,
699 enum lttng_abstract_types atype
,
700 union _ustctl_basic_type
*ubt
,
701 const union _lttng_basic_type
*lbt
)
706 struct ustctl_integer_type
*uit
;
707 const struct lttng_integer_type
*lit
;
711 uit
->size
= lit
->size
;
712 uit
->signedness
= lit
->signedness
;
713 uit
->reverse_byte_order
= lit
->reverse_byte_order
;
714 uit
->base
= lit
->base
;
715 if (serialize_string_encoding(&uit
->encoding
, lit
->encoding
))
717 uit
->alignment
= lit
->alignment
;
718 *uatype
= ustctl_atype_integer
;
723 if (serialize_string_encoding(&ubt
->string
.encoding
,
724 lbt
->string
.encoding
))
726 *uatype
= ustctl_atype_string
;
731 struct ustctl_float_type
*uft
;
732 const struct lttng_float_type
*lft
;
736 uft
->exp_dig
= lft
->exp_dig
;
737 uft
->mant_dig
= lft
->mant_dig
;
738 uft
->alignment
= lft
->alignment
;
739 uft
->reverse_byte_order
= lft
->reverse_byte_order
;
740 *uatype
= ustctl_atype_float
;
753 int serialize_one_type(struct ustctl_type
*ut
, const struct lttng_type
*lt
)
761 ret
= serialize_basic_type(&ut
->atype
, lt
->atype
,
762 &ut
->u
.basic
, <
->u
.basic
);
768 struct ustctl_basic_type
*ubt
;
769 const struct lttng_basic_type
*lbt
;
772 ubt
= &ut
->u
.array
.elem_type
;
773 lbt
= <
->u
.array
.elem_type
;
774 ut
->u
.array
.length
= lt
->u
.array
.length
;
775 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
776 &ubt
->u
.basic
, &lbt
->u
.basic
);
779 ut
->atype
= ustctl_atype_array
;
784 struct ustctl_basic_type
*ubt
;
785 const struct lttng_basic_type
*lbt
;
788 ubt
= &ut
->u
.sequence
.length_type
;
789 lbt
= <
->u
.sequence
.length_type
;
790 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
791 &ubt
->u
.basic
, &lbt
->u
.basic
);
794 ubt
= &ut
->u
.sequence
.elem_type
;
795 lbt
= <
->u
.sequence
.elem_type
;
796 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
797 &ubt
->u
.basic
, &lbt
->u
.basic
);
800 ut
->atype
= ustctl_atype_sequence
;
811 int serialize_fields(size_t *_nr_write_fields
,
812 struct ustctl_field
**ustctl_fields
,
814 const struct lttng_event_field
*lttng_fields
)
816 struct ustctl_field
*fields
;
818 size_t nr_write_fields
= 0;
820 fields
= zmalloc(nr_fields
* sizeof(*fields
));
824 for (i
= 0; i
< nr_fields
; i
++) {
825 struct ustctl_field
*f
;
826 const struct lttng_event_field
*lf
;
828 f
= &fields
[nr_write_fields
];
829 lf
= <tng_fields
[i
];
831 /* skip 'nowrite' fields */
834 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
835 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
836 ret
= serialize_one_type(&f
->type
, &lf
->type
);
842 *_nr_write_fields
= nr_write_fields
;
843 *ustctl_fields
= fields
;
852 int serialize_ctx_fields(size_t *_nr_write_fields
,
853 struct ustctl_field
**ustctl_fields
,
855 const struct lttng_ctx_field
*lttng_fields
)
857 struct ustctl_field
*fields
;
859 size_t nr_write_fields
= 0;
861 fields
= zmalloc(nr_fields
* sizeof(*fields
));
865 for (i
= 0; i
< nr_fields
; i
++) {
866 struct ustctl_field
*f
;
867 const struct lttng_event_field
*lf
;
869 f
= &fields
[nr_write_fields
];
870 lf
= <tng_fields
[i
].event_field
;
872 /* skip 'nowrite' fields */
875 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
876 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
877 ret
= serialize_one_type(&f
->type
, &lf
->type
);
883 *_nr_write_fields
= nr_write_fields
;
884 *ustctl_fields
= fields
;
893 * Returns 0 on success, negative error value on error.
895 int ustcomm_register_event(int sock
,
896 int session_objd
, /* session descriptor */
897 int channel_objd
, /* channel descriptor */
898 const char *event_name
, /* event name (input) */
900 const char *signature
, /* event signature (input) */
901 size_t nr_fields
, /* fields */
902 const struct lttng_event_field
*lttng_fields
,
903 const char *model_emf_uri
,
904 uint32_t *id
) /* event id (output) */
908 struct ustcomm_notify_hdr header
;
909 struct ustcomm_notify_event_msg m
;
912 struct ustcomm_notify_hdr header
;
913 struct ustcomm_notify_event_reply r
;
915 size_t signature_len
, fields_len
, model_emf_uri_len
;
916 struct ustctl_field
*fields
= NULL
;
917 size_t nr_write_fields
= 0;
920 memset(&msg
, 0, sizeof(msg
));
921 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_EVENT
;
922 msg
.m
.session_objd
= session_objd
;
923 msg
.m
.channel_objd
= channel_objd
;
924 strncpy(msg
.m
.event_name
, event_name
, LTTNG_UST_SYM_NAME_LEN
);
925 msg
.m
.event_name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
926 msg
.m
.loglevel
= loglevel
;
927 signature_len
= strlen(signature
) + 1;
928 msg
.m
.signature_len
= signature_len
;
930 /* Calculate fields len, serialize fields. */
932 ret
= serialize_fields(&nr_write_fields
, &fields
,
933 nr_fields
, lttng_fields
);
938 fields_len
= sizeof(*fields
) * nr_write_fields
;
939 msg
.m
.fields_len
= fields_len
;
941 model_emf_uri_len
= strlen(model_emf_uri
) + 1;
943 model_emf_uri_len
= 0;
945 msg
.m
.model_emf_uri_len
= model_emf_uri_len
;
946 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
947 if (len
> 0 && len
!= sizeof(msg
)) {
957 len
= ustcomm_send_unix_sock(sock
, signature
, signature_len
);
958 if (len
> 0 && len
!= signature_len
) {
968 if (fields_len
> 0) {
969 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
971 if (len
> 0 && len
!= fields_len
) {
981 if (model_emf_uri_len
) {
982 /* send model_emf_uri */
983 len
= ustcomm_send_unix_sock(sock
, model_emf_uri
,
985 if (len
> 0 && len
!= model_emf_uri_len
)
992 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
994 case 0: /* orderly shutdown */
997 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
998 ERR("Unexpected result message command "
999 "expected: %u vs received: %u\n",
1000 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
1003 if (reply
.r
.ret_code
> 0)
1005 if (reply
.r
.ret_code
< 0)
1006 return reply
.r
.ret_code
;
1007 *id
= reply
.r
.event_id
;
1008 DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n",
1009 event_name
, reply
.r
.ret_code
, reply
.r
.event_id
);
1013 /* Transport level error */
1014 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1018 ERR("incorrect message size: %zd\n", len
);
1025 * Returns 0 on success, negative error value on error.
1026 * Returns -EPIPE or -ECONNRESET if other end has hung up.
1028 int ustcomm_register_channel(int sock
,
1029 int session_objd
, /* session descriptor */
1030 int channel_objd
, /* channel descriptor */
1031 size_t nr_ctx_fields
,
1032 const struct lttng_ctx_field
*ctx_fields
,
1033 uint32_t *chan_id
, /* channel id (output) */
1034 int *header_type
) /* header type (output) */
1038 struct ustcomm_notify_hdr header
;
1039 struct ustcomm_notify_channel_msg m
;
1042 struct ustcomm_notify_hdr header
;
1043 struct ustcomm_notify_channel_reply r
;
1046 struct ustctl_field
*fields
= NULL
;
1048 size_t nr_write_fields
= 0;
1050 memset(&msg
, 0, sizeof(msg
));
1051 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_CHANNEL
;
1052 msg
.m
.session_objd
= session_objd
;
1053 msg
.m
.channel_objd
= channel_objd
;
1055 /* Calculate fields len, serialize fields. */
1056 if (nr_ctx_fields
> 0) {
1057 ret
= serialize_ctx_fields(&nr_write_fields
, &fields
,
1058 nr_ctx_fields
, ctx_fields
);
1063 fields_len
= sizeof(*fields
) * nr_write_fields
;
1064 msg
.m
.ctx_fields_len
= fields_len
;
1065 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
1066 if (len
> 0 && len
!= sizeof(msg
)) {
1076 if (fields_len
> 0) {
1077 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
1079 if (len
> 0 && len
!= fields_len
) {
1089 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
1091 case 0: /* orderly shutdown */
1094 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
1095 ERR("Unexpected result message command "
1096 "expected: %u vs received: %u\n",
1097 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
1100 if (reply
.r
.ret_code
> 0)
1102 if (reply
.r
.ret_code
< 0)
1103 return reply
.r
.ret_code
;
1104 *chan_id
= reply
.r
.chan_id
;
1105 switch (reply
.r
.header_type
) {
1108 *header_type
= reply
.r
.header_type
;
1111 ERR("Unexpected channel header type %u\n",
1112 reply
.r
.header_type
);
1115 DBG("Sent register channel notification: chan_id %d, header_type %d\n",
1116 reply
.r
.chan_id
, reply
.r
.header_type
);
1120 /* Transport level error */
1121 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1125 ERR("incorrect message size: %zd\n", len
);
1132 * Set socket reciving timeout.
1134 int ustcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
)
1139 tv
.tv_sec
= msec
/ 1000;
1140 tv
.tv_usec
= (msec
* 1000 % 1000000);
1142 ret
= setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
, &tv
, sizeof(tv
));
1144 PERROR("setsockopt SO_RCVTIMEO");
1152 * Set socket sending timeout.
1154 int ustcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
)
1159 tv
.tv_sec
= msec
/ 1000;
1160 tv
.tv_usec
= (msec
* 1000) % 1000000;
1162 ret
= setsockopt(sock
, SOL_SOCKET
, SO_SNDTIMEO
, &tv
, sizeof(tv
));
1164 PERROR("setsockopt SO_SNDTIMEO");