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
);
382 cmptr
->cmsg_level
= SOL_SOCKET
;
383 cmptr
->cmsg_type
= SCM_RIGHTS
;
384 cmptr
->cmsg_len
= CMSG_LEN(sizeof_fds
);
385 memcpy(CMSG_DATA(cmptr
), fds
, sizeof_fds
);
386 /* Sum of the length of all control messages in the buffer: */
387 msg
.msg_controllen
= cmptr
->cmsg_len
;
389 iov
[0].iov_base
= &dummy
;
395 ret
= sendmsg(sock
, &msg
, MSG_NOSIGNAL
);
396 } while (ret
< 0 && errno
== EINTR
);
399 * We consider EPIPE and ECONNRESET as expected.
401 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
405 if (ret
== -ECONNRESET
)
412 * Recv a message accompanied by fd(s) from a unix socket.
414 * Returns the size of received data, or negative error value.
416 * Expect at most "nb_fd" file descriptors. Returns the number of fd
417 * actually received in nb_fd.
418 * Returns -EPIPE on orderly shutdown.
420 ssize_t
ustcomm_recv_fds_unix_sock(int sock
, int *fds
, size_t nb_fd
)
424 struct cmsghdr
*cmsg
;
425 size_t sizeof_fds
= nb_fd
* sizeof(int);
426 char recv_fd
[CMSG_SPACE(sizeof_fds
)];
430 memset(&msg
, 0, sizeof(msg
));
432 /* Prepare to receive the structures */
433 iov
[0].iov_base
= &dummy
;
437 msg
.msg_control
= recv_fd
;
438 msg
.msg_controllen
= sizeof(recv_fd
);
441 ret
= recvmsg(sock
, &msg
, 0);
442 } while (ret
< 0 && errno
== EINTR
);
444 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
445 PERROR("recvmsg fds");
448 if (ret
== -ECONNRESET
)
453 /* orderly shutdown */
458 ERR("Error: Received %zd bytes, expected %d\n",
462 if (msg
.msg_flags
& MSG_CTRUNC
) {
463 ERR("Error: Control message truncated.\n");
467 cmsg
= CMSG_FIRSTHDR(&msg
);
469 ERR("Error: Invalid control message header\n");
473 if (cmsg
->cmsg_level
!= SOL_SOCKET
|| cmsg
->cmsg_type
!= SCM_RIGHTS
) {
474 ERR("Didn't received any fd\n");
478 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof_fds
)) {
479 ERR("Error: Received %zu bytes of ancillary data, expected %zu\n",
480 (size_t) cmsg
->cmsg_len
, (size_t) CMSG_LEN(sizeof_fds
));
484 memcpy(fds
, CMSG_DATA(cmsg
), sizeof_fds
);
490 int ustcomm_send_app_msg(int sock
, struct ustcomm_ust_msg
*lum
)
494 len
= ustcomm_send_unix_sock(sock
, lum
, sizeof(*lum
));
502 ERR("incorrect message size: %zd\n", len
);
509 int ustcomm_recv_app_reply(int sock
, struct ustcomm_ust_reply
*lur
,
510 uint32_t expected_handle
, uint32_t expected_cmd
)
514 memset(lur
, 0, sizeof(*lur
));
515 len
= ustcomm_recv_unix_sock(sock
, lur
, sizeof(*lur
));
517 case 0: /* orderly shutdown */
520 if (lur
->handle
!= expected_handle
) {
521 ERR("Unexpected result message handle: "
522 "expected: %u vs received: %u\n",
523 expected_handle
, lur
->handle
);
526 if (lur
->cmd
!= expected_cmd
) {
527 ERR("Unexpected result message command "
528 "expected: %u vs received: %u\n",
529 expected_cmd
, lur
->cmd
);
532 return lur
->ret_code
;
535 ERR("incorrect message size: %zd\n", len
);
541 int ustcomm_send_app_cmd(int sock
,
542 struct ustcomm_ust_msg
*lum
,
543 struct ustcomm_ust_reply
*lur
)
547 ret
= ustcomm_send_app_msg(sock
, lum
);
550 ret
= ustcomm_recv_app_reply(sock
, lur
, lum
->handle
, lum
->cmd
);
557 * chan_data is allocated internally if this function returns the
560 ssize_t
ustcomm_recv_channel_from_sessiond(int sock
,
561 void **_chan_data
, uint64_t var_len
,
568 if (var_len
> LTTNG_UST_CHANNEL_DATA_MAX_LEN
) {
572 /* Receive variable length data */
573 chan_data
= zmalloc(var_len
);
578 len
= ustcomm_recv_unix_sock(sock
, chan_data
, var_len
);
579 if (len
!= var_len
) {
583 nr_fd
= ustcomm_recv_fds_unix_sock(sock
, &wakeup_fd
, 1);
593 *_wakeup_fd
= wakeup_fd
;
594 *_chan_data
= chan_data
;
604 int ustcomm_recv_stream_from_sessiond(int sock
,
605 uint64_t *memory_map_size
,
606 int *shm_fd
, int *wakeup_fd
)
612 /* recv shm fd and wakeup fd */
613 len
= ustcomm_recv_fds_unix_sock(sock
, fds
, 2);
632 * Returns 0 on success, negative error value on error.
634 int ustcomm_send_reg_msg(int sock
,
635 enum ustctl_socket_type type
,
636 uint32_t bits_per_long
,
637 uint32_t uint8_t_alignment
,
638 uint32_t uint16_t_alignment
,
639 uint32_t uint32_t_alignment
,
640 uint32_t uint64_t_alignment
,
641 uint32_t long_alignment
)
644 struct ustctl_reg_msg reg_msg
;
646 reg_msg
.magic
= LTTNG_UST_COMM_MAGIC
;
647 reg_msg
.major
= LTTNG_UST_ABI_MAJOR_VERSION
;
648 reg_msg
.minor
= LTTNG_UST_ABI_MINOR_VERSION
;
649 reg_msg
.pid
= getpid();
650 reg_msg
.ppid
= getppid();
651 reg_msg
.uid
= getuid();
652 reg_msg
.gid
= getgid();
653 reg_msg
.bits_per_long
= bits_per_long
;
654 reg_msg
.uint8_t_alignment
= uint8_t_alignment
;
655 reg_msg
.uint16_t_alignment
= uint16_t_alignment
;
656 reg_msg
.uint32_t_alignment
= uint32_t_alignment
;
657 reg_msg
.uint64_t_alignment
= uint64_t_alignment
;
658 reg_msg
.long_alignment
= long_alignment
;
659 reg_msg
.socket_type
= type
;
660 lttng_ust_getprocname(reg_msg
.name
);
661 memset(reg_msg
.padding
, 0, sizeof(reg_msg
.padding
));
663 len
= ustcomm_send_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
664 if (len
> 0 && len
!= sizeof(reg_msg
))
672 int serialize_string_encoding(enum ustctl_string_encodings
*ue
,
673 enum lttng_string_encodings le
)
676 case lttng_encode_none
:
677 *ue
= ustctl_encode_none
;
679 case lttng_encode_UTF8
:
680 *ue
= ustctl_encode_UTF8
;
682 case lttng_encode_ASCII
:
683 *ue
= ustctl_encode_ASCII
;
692 int serialize_basic_type(enum ustctl_abstract_types
*uatype
,
693 enum lttng_abstract_types atype
,
694 union _ustctl_basic_type
*ubt
,
695 const union _lttng_basic_type
*lbt
)
700 struct ustctl_integer_type
*uit
;
701 const struct lttng_integer_type
*lit
;
705 uit
->size
= lit
->size
;
706 uit
->signedness
= lit
->signedness
;
707 uit
->reverse_byte_order
= lit
->reverse_byte_order
;
708 uit
->base
= lit
->base
;
709 if (serialize_string_encoding(&uit
->encoding
, lit
->encoding
))
711 uit
->alignment
= lit
->alignment
;
712 *uatype
= ustctl_atype_integer
;
717 if (serialize_string_encoding(&ubt
->string
.encoding
,
718 lbt
->string
.encoding
))
720 *uatype
= ustctl_atype_string
;
725 struct ustctl_float_type
*uft
;
726 const struct lttng_float_type
*lft
;
730 uft
->exp_dig
= lft
->exp_dig
;
731 uft
->mant_dig
= lft
->mant_dig
;
732 uft
->alignment
= lft
->alignment
;
733 uft
->reverse_byte_order
= lft
->reverse_byte_order
;
734 *uatype
= ustctl_atype_float
;
747 int serialize_one_type(struct ustctl_type
*ut
, const struct lttng_type
*lt
)
755 ret
= serialize_basic_type(&ut
->atype
, lt
->atype
,
756 &ut
->u
.basic
, <
->u
.basic
);
762 struct ustctl_basic_type
*ubt
;
763 const struct lttng_basic_type
*lbt
;
766 ubt
= &ut
->u
.array
.elem_type
;
767 lbt
= <
->u
.array
.elem_type
;
768 ut
->u
.array
.length
= lt
->u
.array
.length
;
769 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
770 &ubt
->u
.basic
, &lbt
->u
.basic
);
773 ut
->atype
= ustctl_atype_array
;
778 struct ustctl_basic_type
*ubt
;
779 const struct lttng_basic_type
*lbt
;
782 ubt
= &ut
->u
.sequence
.length_type
;
783 lbt
= <
->u
.sequence
.length_type
;
784 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
785 &ubt
->u
.basic
, &lbt
->u
.basic
);
788 ubt
= &ut
->u
.sequence
.elem_type
;
789 lbt
= <
->u
.sequence
.elem_type
;
790 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
791 &ubt
->u
.basic
, &lbt
->u
.basic
);
794 ut
->atype
= ustctl_atype_sequence
;
805 int serialize_fields(size_t *_nr_write_fields
,
806 struct ustctl_field
**ustctl_fields
,
808 const struct lttng_event_field
*lttng_fields
)
810 struct ustctl_field
*fields
;
812 size_t nr_write_fields
= 0;
814 fields
= zmalloc(nr_fields
* sizeof(*fields
));
818 for (i
= 0; i
< nr_fields
; i
++) {
819 struct ustctl_field
*f
;
820 const struct lttng_event_field
*lf
;
822 f
= &fields
[nr_write_fields
];
823 lf
= <tng_fields
[i
];
825 /* skip 'nowrite' fields */
828 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
829 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
830 ret
= serialize_one_type(&f
->type
, &lf
->type
);
836 *_nr_write_fields
= nr_write_fields
;
837 *ustctl_fields
= fields
;
846 int serialize_ctx_fields(size_t *_nr_write_fields
,
847 struct ustctl_field
**ustctl_fields
,
849 const struct lttng_ctx_field
*lttng_fields
)
851 struct ustctl_field
*fields
;
853 size_t nr_write_fields
= 0;
855 fields
= zmalloc(nr_fields
* sizeof(*fields
));
859 for (i
= 0; i
< nr_fields
; i
++) {
860 struct ustctl_field
*f
;
861 const struct lttng_event_field
*lf
;
863 f
= &fields
[nr_write_fields
];
864 lf
= <tng_fields
[i
].event_field
;
866 /* skip 'nowrite' fields */
869 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
870 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
871 ret
= serialize_one_type(&f
->type
, &lf
->type
);
877 *_nr_write_fields
= nr_write_fields
;
878 *ustctl_fields
= fields
;
887 * Returns 0 on success, negative error value on error.
889 int ustcomm_register_event(int sock
,
890 int session_objd
, /* session descriptor */
891 int channel_objd
, /* channel descriptor */
892 const char *event_name
, /* event name (input) */
894 const char *signature
, /* event signature (input) */
895 size_t nr_fields
, /* fields */
896 const struct lttng_event_field
*lttng_fields
,
897 const char *model_emf_uri
,
898 uint32_t *id
) /* event id (output) */
902 struct ustcomm_notify_hdr header
;
903 struct ustcomm_notify_event_msg m
;
906 struct ustcomm_notify_hdr header
;
907 struct ustcomm_notify_event_reply r
;
909 size_t signature_len
, fields_len
, model_emf_uri_len
;
910 struct ustctl_field
*fields
= NULL
;
911 size_t nr_write_fields
= 0;
914 memset(&msg
, 0, sizeof(msg
));
915 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_EVENT
;
916 msg
.m
.session_objd
= session_objd
;
917 msg
.m
.channel_objd
= channel_objd
;
918 strncpy(msg
.m
.event_name
, event_name
, LTTNG_UST_SYM_NAME_LEN
);
919 msg
.m
.event_name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
920 msg
.m
.loglevel
= loglevel
;
921 signature_len
= strlen(signature
) + 1;
922 msg
.m
.signature_len
= signature_len
;
924 /* Calculate fields len, serialize fields. */
926 ret
= serialize_fields(&nr_write_fields
, &fields
,
927 nr_fields
, lttng_fields
);
932 fields_len
= sizeof(*fields
) * nr_write_fields
;
933 msg
.m
.fields_len
= fields_len
;
935 model_emf_uri_len
= strlen(model_emf_uri
) + 1;
937 model_emf_uri_len
= 0;
939 msg
.m
.model_emf_uri_len
= model_emf_uri_len
;
940 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
941 if (len
> 0 && len
!= sizeof(msg
)) {
951 len
= ustcomm_send_unix_sock(sock
, signature
, signature_len
);
952 if (len
> 0 && len
!= signature_len
) {
962 if (fields_len
> 0) {
963 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
965 if (len
> 0 && len
!= fields_len
) {
975 if (model_emf_uri_len
) {
976 /* send model_emf_uri */
977 len
= ustcomm_send_unix_sock(sock
, model_emf_uri
,
979 if (len
> 0 && len
!= model_emf_uri_len
)
986 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
988 case 0: /* orderly shutdown */
991 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
992 ERR("Unexpected result message command "
993 "expected: %u vs received: %u\n",
994 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
997 if (reply
.r
.ret_code
> 0)
999 if (reply
.r
.ret_code
< 0)
1000 return reply
.r
.ret_code
;
1001 *id
= reply
.r
.event_id
;
1002 DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n",
1003 event_name
, reply
.r
.ret_code
, reply
.r
.event_id
);
1007 /* Transport level error */
1008 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1012 ERR("incorrect message size: %zd\n", len
);
1019 * Returns 0 on success, negative error value on error.
1020 * Returns -EPIPE or -ECONNRESET if other end has hung up.
1022 int ustcomm_register_channel(int sock
,
1023 int session_objd
, /* session descriptor */
1024 int channel_objd
, /* channel descriptor */
1025 size_t nr_ctx_fields
,
1026 const struct lttng_ctx_field
*ctx_fields
,
1027 uint32_t *chan_id
, /* channel id (output) */
1028 int *header_type
) /* header type (output) */
1032 struct ustcomm_notify_hdr header
;
1033 struct ustcomm_notify_channel_msg m
;
1036 struct ustcomm_notify_hdr header
;
1037 struct ustcomm_notify_channel_reply r
;
1040 struct ustctl_field
*fields
= NULL
;
1042 size_t nr_write_fields
= 0;
1044 memset(&msg
, 0, sizeof(msg
));
1045 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_CHANNEL
;
1046 msg
.m
.session_objd
= session_objd
;
1047 msg
.m
.channel_objd
= channel_objd
;
1049 /* Calculate fields len, serialize fields. */
1050 if (nr_ctx_fields
> 0) {
1051 ret
= serialize_ctx_fields(&nr_write_fields
, &fields
,
1052 nr_ctx_fields
, ctx_fields
);
1057 fields_len
= sizeof(*fields
) * nr_write_fields
;
1058 msg
.m
.ctx_fields_len
= fields_len
;
1059 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
1060 if (len
> 0 && len
!= sizeof(msg
)) {
1070 if (fields_len
> 0) {
1071 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
1073 if (len
> 0 && len
!= fields_len
) {
1083 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
1085 case 0: /* orderly shutdown */
1088 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
1089 ERR("Unexpected result message command "
1090 "expected: %u vs received: %u\n",
1091 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
1094 if (reply
.r
.ret_code
> 0)
1096 if (reply
.r
.ret_code
< 0)
1097 return reply
.r
.ret_code
;
1098 *chan_id
= reply
.r
.chan_id
;
1099 switch (reply
.r
.header_type
) {
1102 *header_type
= reply
.r
.header_type
;
1105 ERR("Unexpected channel header type %u\n",
1106 reply
.r
.header_type
);
1109 DBG("Sent register channel notification: chan_id %d, header_type %d\n",
1110 reply
.r
.chan_id
, reply
.r
.header_type
);
1114 /* Transport level error */
1115 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1119 ERR("incorrect message size: %zd\n", len
);
1126 * Set socket reciving timeout.
1128 int ustcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
)
1133 tv
.tv_sec
= msec
/ 1000;
1134 tv
.tv_usec
= (msec
* 1000 % 1000000);
1136 ret
= setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
, &tv
, sizeof(tv
));
1138 PERROR("setsockopt SO_RCVTIMEO");
1146 * Set socket sending timeout.
1148 int ustcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
)
1153 tv
.tv_sec
= msec
/ 1000;
1154 tv
.tv_usec
= (msec
* 1000) % 1000000;
1156 ret
= setsockopt(sock
, SOL_SOCKET
, SO_SNDTIMEO
, &tv
, sizeof(tv
));
1158 PERROR("setsockopt SO_SNDTIMEO");