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
)
270 memset(&msg
, 0, sizeof(msg
));
272 iov
[0].iov_base
= buf
;
273 iov
[0].iov_len
= len
;
278 ret
= recvmsg(sock
, &msg
, 0);
279 } while (ret
< 0 && errno
== EINTR
);
284 if (errno
!= EPIPE
&& errno
!= ECONNRESET
&& errno
!= ECONNREFUSED
)
287 if (ret
== -ECONNRESET
|| ret
== -ECONNREFUSED
)
290 shutret
= shutdown(sock
, SHUT_RDWR
);
292 ERR("Socket shutdown error");
299 * ustcomm_send_unix_sock
301 * Send buf data of size len. Using sendmsg API.
302 * Return the size of sent data.
304 ssize_t
ustcomm_send_unix_sock(int sock
, const void *buf
, size_t len
)
310 memset(&msg
, 0, sizeof(msg
));
312 iov
[0].iov_base
= (void *) buf
;
313 iov
[0].iov_len
= len
;
318 * Using the MSG_NOSIGNAL when sending data from sessiond to
319 * libust, so libust does not receive an unhandled SIGPIPE or
320 * SIGURG. The sessiond receiver side can be made more resilient
321 * by ignoring SIGPIPE, but we don't have this luxury on the
325 ret
= sendmsg(sock
, &msg
, MSG_NOSIGNAL
);
326 } while (ret
< 0 && errno
== EINTR
);
331 if (errno
!= EPIPE
&& errno
!= ECONNRESET
)
334 if (ret
== -ECONNRESET
)
337 shutret
= shutdown(sock
, SHUT_RDWR
);
339 ERR("Socket shutdown error");
346 * Send a message accompanied by fd(s) over a unix socket.
348 * Returns the size of data sent, or negative error value.
350 ssize_t
ustcomm_send_fds_unix_sock(int sock
, int *fds
, size_t nb_fd
)
353 struct cmsghdr
*cmptr
;
356 unsigned int sizeof_fds
= nb_fd
* sizeof(int);
357 char tmp
[CMSG_SPACE(sizeof_fds
)];
360 memset(&msg
, 0, sizeof(msg
));
361 memset(tmp
, 0, CMSG_SPACE(sizeof_fds
) * sizeof(char));
363 if (nb_fd
> USTCOMM_MAX_SEND_FDS
)
366 msg
.msg_control
= (caddr_t
)tmp
;
367 msg
.msg_controllen
= CMSG_LEN(sizeof_fds
);
369 cmptr
= CMSG_FIRSTHDR(&msg
);
370 cmptr
->cmsg_level
= SOL_SOCKET
;
371 cmptr
->cmsg_type
= SCM_RIGHTS
;
372 cmptr
->cmsg_len
= CMSG_LEN(sizeof_fds
);
373 memcpy(CMSG_DATA(cmptr
), fds
, sizeof_fds
);
374 /* Sum of the length of all control messages in the buffer: */
375 msg
.msg_controllen
= cmptr
->cmsg_len
;
377 iov
[0].iov_base
= &dummy
;
383 ret
= sendmsg(sock
, &msg
, 0);
384 } while (ret
< 0 && errno
== EINTR
);
387 * We consider EPIPE and ECONNRESET as expected.
389 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
393 if (ret
== -ECONNRESET
)
400 * Recv a message accompanied by fd(s) from a unix socket.
402 * Returns the size of received data, or negative error value.
404 * Expect at most "nb_fd" file descriptors. Returns the number of fd
405 * actually received in nb_fd.
406 * Returns -EPIPE on orderly shutdown.
408 ssize_t
ustcomm_recv_fds_unix_sock(int sock
, int *fds
, size_t nb_fd
)
412 struct cmsghdr
*cmsg
;
413 size_t sizeof_fds
= nb_fd
* sizeof(int);
414 char recv_fd
[CMSG_SPACE(sizeof_fds
)];
418 memset(&msg
, 0, sizeof(msg
));
420 /* Prepare to receive the structures */
421 iov
[0].iov_base
= &dummy
;
425 msg
.msg_control
= recv_fd
;
426 msg
.msg_controllen
= sizeof(recv_fd
);
429 ret
= recvmsg(sock
, &msg
, 0);
430 } while (ret
< 0 && errno
== EINTR
);
432 if (errno
!= EPIPE
&& errno
!= ECONNRESET
) {
433 PERROR("recvmsg fds");
436 if (ret
== -ECONNRESET
)
441 /* orderly shutdown */
446 ERR("Error: Received %zd bytes, expected %d\n",
450 if (msg
.msg_flags
& MSG_CTRUNC
) {
451 ERR("Error: Control message truncated.\n");
455 cmsg
= CMSG_FIRSTHDR(&msg
);
457 ERR("Error: Invalid control message header\n");
461 if (cmsg
->cmsg_level
!= SOL_SOCKET
|| cmsg
->cmsg_type
!= SCM_RIGHTS
) {
462 ERR("Didn't received any fd\n");
466 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof_fds
)) {
467 ERR("Error: Received %zu bytes of ancillary data, expected %zu\n",
468 (size_t) cmsg
->cmsg_len
, (size_t) CMSG_LEN(sizeof_fds
));
472 memcpy(fds
, CMSG_DATA(cmsg
), sizeof_fds
);
478 int ustcomm_send_app_msg(int sock
, struct ustcomm_ust_msg
*lum
)
482 len
= ustcomm_send_unix_sock(sock
, lum
, sizeof(*lum
));
490 ERR("incorrect message size: %zd\n", len
);
497 int ustcomm_recv_app_reply(int sock
, struct ustcomm_ust_reply
*lur
,
498 uint32_t expected_handle
, uint32_t expected_cmd
)
502 memset(lur
, 0, sizeof(*lur
));
503 len
= ustcomm_recv_unix_sock(sock
, lur
, sizeof(*lur
));
505 case 0: /* orderly shutdown */
508 if (lur
->handle
!= expected_handle
) {
509 ERR("Unexpected result message handle: "
510 "expected: %u vs received: %u\n",
511 expected_handle
, lur
->handle
);
514 if (lur
->cmd
!= expected_cmd
) {
515 ERR("Unexpected result message command "
516 "expected: %u vs received: %u\n",
517 expected_cmd
, lur
->cmd
);
520 return lur
->ret_code
;
523 ERR("incorrect message size: %zd\n", len
);
529 int ustcomm_send_app_cmd(int sock
,
530 struct ustcomm_ust_msg
*lum
,
531 struct ustcomm_ust_reply
*lur
)
535 ret
= ustcomm_send_app_msg(sock
, lum
);
538 ret
= ustcomm_recv_app_reply(sock
, lur
, lum
->handle
, lum
->cmd
);
545 * chan_data is allocated internally if this function returns the
548 ssize_t
ustcomm_recv_channel_from_sessiond(int sock
,
549 void **_chan_data
, uint64_t var_len
,
556 if (var_len
> LTTNG_UST_CHANNEL_DATA_MAX_LEN
) {
560 /* Receive variable length data */
561 chan_data
= zmalloc(var_len
);
566 len
= ustcomm_recv_unix_sock(sock
, chan_data
, var_len
);
567 if (len
!= var_len
) {
571 nr_fd
= ustcomm_recv_fds_unix_sock(sock
, &wakeup_fd
, 1);
581 *_wakeup_fd
= wakeup_fd
;
582 *_chan_data
= chan_data
;
592 int ustcomm_recv_stream_from_sessiond(int sock
,
593 uint64_t *memory_map_size
,
594 int *shm_fd
, int *wakeup_fd
)
600 /* recv shm fd and wakeup fd */
601 len
= ustcomm_recv_fds_unix_sock(sock
, fds
, 2);
620 * Returns 0 on success, negative error value on error.
622 int ustcomm_send_reg_msg(int sock
,
623 enum ustctl_socket_type type
,
624 uint32_t bits_per_long
,
625 uint32_t uint8_t_alignment
,
626 uint32_t uint16_t_alignment
,
627 uint32_t uint32_t_alignment
,
628 uint32_t uint64_t_alignment
,
629 uint32_t long_alignment
)
632 struct ustctl_reg_msg reg_msg
;
634 reg_msg
.magic
= LTTNG_UST_COMM_MAGIC
;
635 reg_msg
.major
= LTTNG_UST_ABI_MAJOR_VERSION
;
636 reg_msg
.minor
= LTTNG_UST_ABI_MINOR_VERSION
;
637 reg_msg
.pid
= getpid();
638 reg_msg
.ppid
= getppid();
639 reg_msg
.uid
= getuid();
640 reg_msg
.gid
= getgid();
641 reg_msg
.bits_per_long
= bits_per_long
;
642 reg_msg
.uint8_t_alignment
= uint8_t_alignment
;
643 reg_msg
.uint16_t_alignment
= uint16_t_alignment
;
644 reg_msg
.uint32_t_alignment
= uint32_t_alignment
;
645 reg_msg
.uint64_t_alignment
= uint64_t_alignment
;
646 reg_msg
.long_alignment
= long_alignment
;
647 reg_msg
.socket_type
= type
;
648 lttng_ust_getprocname(reg_msg
.name
);
649 memset(reg_msg
.padding
, 0, sizeof(reg_msg
.padding
));
651 len
= ustcomm_send_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
652 if (len
> 0 && len
!= sizeof(reg_msg
))
660 int serialize_string_encoding(enum ustctl_string_encodings
*ue
,
661 enum lttng_string_encodings le
)
664 case lttng_encode_none
:
665 *ue
= ustctl_encode_none
;
667 case lttng_encode_UTF8
:
668 *ue
= ustctl_encode_UTF8
;
670 case lttng_encode_ASCII
:
671 *ue
= ustctl_encode_ASCII
;
680 int serialize_basic_type(enum ustctl_abstract_types
*uatype
,
681 enum lttng_abstract_types atype
,
682 union _ustctl_basic_type
*ubt
,
683 const union _lttng_basic_type
*lbt
)
688 struct ustctl_integer_type
*uit
;
689 const struct lttng_integer_type
*lit
;
693 uit
->size
= lit
->size
;
694 uit
->signedness
= lit
->signedness
;
695 uit
->reverse_byte_order
= lit
->reverse_byte_order
;
696 uit
->base
= lit
->base
;
697 if (serialize_string_encoding(&uit
->encoding
, lit
->encoding
))
699 uit
->alignment
= lit
->alignment
;
700 *uatype
= ustctl_atype_integer
;
705 if (serialize_string_encoding(&ubt
->string
.encoding
,
706 lbt
->string
.encoding
))
708 *uatype
= ustctl_atype_string
;
713 struct ustctl_float_type
*uft
;
714 const struct lttng_float_type
*lft
;
718 uft
->exp_dig
= lft
->exp_dig
;
719 uft
->mant_dig
= lft
->mant_dig
;
720 uft
->alignment
= lft
->alignment
;
721 uft
->reverse_byte_order
= lft
->reverse_byte_order
;
722 *uatype
= ustctl_atype_float
;
735 int serialize_one_type(struct ustctl_type
*ut
, const struct lttng_type
*lt
)
743 ret
= serialize_basic_type(&ut
->atype
, lt
->atype
,
744 &ut
->u
.basic
, <
->u
.basic
);
750 struct ustctl_basic_type
*ubt
;
751 const struct lttng_basic_type
*lbt
;
754 ubt
= &ut
->u
.array
.elem_type
;
755 lbt
= <
->u
.array
.elem_type
;
756 ut
->u
.array
.length
= lt
->u
.array
.length
;
757 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
758 &ubt
->u
.basic
, &lbt
->u
.basic
);
761 ut
->atype
= ustctl_atype_array
;
766 struct ustctl_basic_type
*ubt
;
767 const struct lttng_basic_type
*lbt
;
770 ubt
= &ut
->u
.sequence
.length_type
;
771 lbt
= <
->u
.sequence
.length_type
;
772 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
773 &ubt
->u
.basic
, &lbt
->u
.basic
);
776 ubt
= &ut
->u
.sequence
.elem_type
;
777 lbt
= <
->u
.sequence
.elem_type
;
778 ret
= serialize_basic_type(&ubt
->atype
, lbt
->atype
,
779 &ubt
->u
.basic
, &lbt
->u
.basic
);
782 ut
->atype
= ustctl_atype_sequence
;
793 int serialize_fields(size_t *_nr_write_fields
,
794 struct ustctl_field
**ustctl_fields
,
796 const struct lttng_event_field
*lttng_fields
)
798 struct ustctl_field
*fields
;
800 size_t nr_write_fields
= 0;
802 fields
= zmalloc(nr_fields
* sizeof(*fields
));
806 for (i
= 0; i
< nr_fields
; i
++) {
807 struct ustctl_field
*f
;
808 const struct lttng_event_field
*lf
;
810 f
= &fields
[nr_write_fields
];
811 lf
= <tng_fields
[i
];
813 /* skip 'nowrite' fields */
816 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
817 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
818 ret
= serialize_one_type(&f
->type
, &lf
->type
);
824 *_nr_write_fields
= nr_write_fields
;
825 *ustctl_fields
= fields
;
834 int serialize_ctx_fields(size_t *_nr_write_fields
,
835 struct ustctl_field
**ustctl_fields
,
837 const struct lttng_ctx_field
*lttng_fields
)
839 struct ustctl_field
*fields
;
841 size_t nr_write_fields
= 0;
843 fields
= zmalloc(nr_fields
* sizeof(*fields
));
847 for (i
= 0; i
< nr_fields
; i
++) {
848 struct ustctl_field
*f
;
849 const struct lttng_event_field
*lf
;
851 f
= &fields
[nr_write_fields
];
852 lf
= <tng_fields
[i
].event_field
;
854 /* skip 'nowrite' fields */
857 strncpy(f
->name
, lf
->name
, LTTNG_UST_SYM_NAME_LEN
);
858 f
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
859 ret
= serialize_one_type(&f
->type
, &lf
->type
);
865 *_nr_write_fields
= nr_write_fields
;
866 *ustctl_fields
= fields
;
875 * Returns 0 on success, negative error value on error.
877 int ustcomm_register_event(int sock
,
878 int session_objd
, /* session descriptor */
879 int channel_objd
, /* channel descriptor */
880 const char *event_name
, /* event name (input) */
882 const char *signature
, /* event signature (input) */
883 size_t nr_fields
, /* fields */
884 const struct lttng_event_field
*lttng_fields
,
885 const char *model_emf_uri
,
886 uint32_t *id
) /* event id (output) */
890 struct ustcomm_notify_hdr header
;
891 struct ustcomm_notify_event_msg m
;
894 struct ustcomm_notify_hdr header
;
895 struct ustcomm_notify_event_reply r
;
897 size_t signature_len
, fields_len
, model_emf_uri_len
;
898 struct ustctl_field
*fields
= NULL
;
899 size_t nr_write_fields
= 0;
902 memset(&msg
, 0, sizeof(msg
));
903 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_EVENT
;
904 msg
.m
.session_objd
= session_objd
;
905 msg
.m
.channel_objd
= channel_objd
;
906 strncpy(msg
.m
.event_name
, event_name
, LTTNG_UST_SYM_NAME_LEN
);
907 msg
.m
.event_name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
908 msg
.m
.loglevel
= loglevel
;
909 signature_len
= strlen(signature
) + 1;
910 msg
.m
.signature_len
= signature_len
;
912 /* Calculate fields len, serialize fields. */
914 ret
= serialize_fields(&nr_write_fields
, &fields
,
915 nr_fields
, lttng_fields
);
920 fields_len
= sizeof(*fields
) * nr_write_fields
;
921 msg
.m
.fields_len
= fields_len
;
923 model_emf_uri_len
= strlen(model_emf_uri
) + 1;
925 model_emf_uri_len
= 0;
927 msg
.m
.model_emf_uri_len
= model_emf_uri_len
;
928 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
929 if (len
> 0 && len
!= sizeof(msg
)) {
939 len
= ustcomm_send_unix_sock(sock
, signature
, signature_len
);
940 if (len
> 0 && len
!= signature_len
) {
950 if (fields_len
> 0) {
951 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
953 if (len
> 0 && len
!= fields_len
) {
963 if (model_emf_uri_len
) {
964 /* send model_emf_uri */
965 len
= ustcomm_send_unix_sock(sock
, model_emf_uri
,
967 if (len
> 0 && len
!= model_emf_uri_len
)
974 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
976 case 0: /* orderly shutdown */
979 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
980 ERR("Unexpected result message command "
981 "expected: %u vs received: %u\n",
982 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
985 if (reply
.r
.ret_code
> 0)
987 if (reply
.r
.ret_code
< 0)
988 return reply
.r
.ret_code
;
989 *id
= reply
.r
.event_id
;
990 DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n",
991 event_name
, reply
.r
.ret_code
, reply
.r
.event_id
);
995 /* Transport level error */
996 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1000 ERR("incorrect message size: %zd\n", len
);
1007 * Returns 0 on success, negative error value on error.
1008 * Returns -EPIPE or -ECONNRESET if other end has hung up.
1010 int ustcomm_register_channel(int sock
,
1011 int session_objd
, /* session descriptor */
1012 int channel_objd
, /* channel descriptor */
1013 size_t nr_ctx_fields
,
1014 const struct lttng_ctx_field
*ctx_fields
,
1015 uint32_t *chan_id
, /* channel id (output) */
1016 int *header_type
) /* header type (output) */
1020 struct ustcomm_notify_hdr header
;
1021 struct ustcomm_notify_channel_msg m
;
1024 struct ustcomm_notify_hdr header
;
1025 struct ustcomm_notify_channel_reply r
;
1028 struct ustctl_field
*fields
= NULL
;
1030 size_t nr_write_fields
= 0;
1032 memset(&msg
, 0, sizeof(msg
));
1033 msg
.header
.notify_cmd
= USTCTL_NOTIFY_CMD_CHANNEL
;
1034 msg
.m
.session_objd
= session_objd
;
1035 msg
.m
.channel_objd
= channel_objd
;
1037 /* Calculate fields len, serialize fields. */
1038 if (nr_ctx_fields
> 0) {
1039 ret
= serialize_ctx_fields(&nr_write_fields
, &fields
,
1040 nr_ctx_fields
, ctx_fields
);
1045 fields_len
= sizeof(*fields
) * nr_write_fields
;
1046 msg
.m
.ctx_fields_len
= fields_len
;
1047 len
= ustcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
1048 if (len
> 0 && len
!= sizeof(msg
)) {
1058 if (fields_len
> 0) {
1059 len
= ustcomm_send_unix_sock(sock
, fields
, fields_len
);
1061 if (len
> 0 && len
!= fields_len
) {
1071 len
= ustcomm_recv_unix_sock(sock
, &reply
, sizeof(reply
));
1073 case 0: /* orderly shutdown */
1076 if (reply
.header
.notify_cmd
!= msg
.header
.notify_cmd
) {
1077 ERR("Unexpected result message command "
1078 "expected: %u vs received: %u\n",
1079 msg
.header
.notify_cmd
, reply
.header
.notify_cmd
);
1082 if (reply
.r
.ret_code
> 0)
1084 if (reply
.r
.ret_code
< 0)
1085 return reply
.r
.ret_code
;
1086 *chan_id
= reply
.r
.chan_id
;
1087 switch (reply
.r
.header_type
) {
1090 *header_type
= reply
.r
.header_type
;
1093 ERR("Unexpected channel header type %u\n",
1094 reply
.r
.header_type
);
1097 DBG("Sent register channel notification: chan_id %d, header_type %d\n",
1098 reply
.r
.chan_id
, reply
.r
.header_type
);
1102 /* Transport level error */
1103 if (errno
== EPIPE
|| errno
== ECONNRESET
)
1107 ERR("incorrect message size: %zd\n", len
);
1114 * Set socket reciving timeout.
1116 int ustcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
)
1121 tv
.tv_sec
= msec
/ 1000;
1122 tv
.tv_usec
= (msec
* 1000 % 1000000);
1124 ret
= setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
, &tv
, sizeof(tv
));
1126 PERROR("setsockopt SO_RCVTIMEO");
1134 * Set socket sending timeout.
1136 int ustcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
)
1141 tv
.tv_sec
= msec
/ 1000;
1142 tv
.tv_usec
= (msec
* 1000) % 1000000;
1144 ret
= setsockopt(sock
, SOL_SOCKET
, SO_SNDTIMEO
, &tv
, sizeof(tv
));
1146 PERROR("setsockopt SO_SNDTIMEO");