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d8d2416d FD |
1 | /* |
2 | * event-notifier-notification.c | |
3 | * | |
4 | * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com> | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; only | |
9 | * version 2.1 of the License. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #define _LGPL_SOURCE | |
22 | ||
b9f82a28 FD |
23 | #include <assert.h> |
24 | #include <byteswap.h> | |
d8d2416d FD |
25 | #include <errno.h> |
26 | #include <lttng/ust-events.h> | |
27 | #include <usterr-signal-safe.h> | |
28 | ||
b9f82a28 FD |
29 | #include "../libmsgpack/msgpack.h" |
30 | #include "lttng-bytecode.h" | |
d8d2416d FD |
31 | #include "share.h" |
32 | ||
b9f82a28 FD |
33 | static |
34 | void capture_enum(struct lttng_msgpack_writer *writer, | |
35 | struct lttng_interpreter_output *output) __attribute__ ((unused)); | |
36 | static | |
37 | void capture_enum(struct lttng_msgpack_writer *writer, | |
38 | struct lttng_interpreter_output *output) | |
39 | { | |
40 | lttng_msgpack_begin_map(writer, 2); | |
41 | lttng_msgpack_write_str(writer, "type"); | |
42 | lttng_msgpack_write_str(writer, "enum"); | |
43 | ||
44 | lttng_msgpack_write_str(writer, "value"); | |
45 | ||
46 | switch (output->type) { | |
47 | case LTTNG_INTERPRETER_TYPE_SIGNED_ENUM: | |
48 | lttng_msgpack_write_signed_integer(writer, output->u.s); | |
49 | break; | |
50 | case LTTNG_INTERPRETER_TYPE_UNSIGNED_ENUM: | |
51 | lttng_msgpack_write_signed_integer(writer, output->u.u); | |
52 | break; | |
53 | default: | |
54 | abort(); | |
55 | } | |
56 | ||
57 | lttng_msgpack_end_map(writer); | |
58 | } | |
59 | ||
60 | static | |
61 | int64_t capture_sequence_element_signed(uint8_t *ptr, | |
62 | const struct lttng_integer_type *type) | |
63 | { | |
64 | int64_t value; | |
65 | unsigned int size = type->size; | |
66 | bool byte_order_reversed = type->reverse_byte_order; | |
67 | ||
68 | switch (size) { | |
69 | case 8: | |
70 | value = *ptr; | |
71 | break; | |
72 | case 16: | |
73 | { | |
74 | int16_t tmp; | |
75 | tmp = *(int16_t *) ptr; | |
76 | if (byte_order_reversed) | |
77 | tmp = bswap_16(tmp); | |
78 | ||
79 | value = tmp; | |
80 | break; | |
81 | } | |
82 | case 32: | |
83 | { | |
84 | int32_t tmp; | |
85 | tmp = *(int32_t *) ptr; | |
86 | if (byte_order_reversed) | |
87 | tmp = bswap_32(tmp); | |
88 | ||
89 | value = tmp; | |
90 | break; | |
91 | } | |
92 | case 64: | |
93 | { | |
94 | int64_t tmp; | |
95 | tmp = *(int64_t *) ptr; | |
96 | if (byte_order_reversed) | |
97 | tmp = bswap_64(tmp); | |
98 | ||
99 | value = tmp; | |
100 | break; | |
101 | } | |
102 | default: | |
103 | abort(); | |
104 | } | |
105 | ||
106 | return value; | |
107 | } | |
108 | ||
109 | static | |
110 | uint64_t capture_sequence_element_unsigned(uint8_t *ptr, | |
111 | const struct lttng_integer_type *type) | |
112 | { | |
113 | uint64_t value; | |
114 | unsigned int size = type->size; | |
115 | bool byte_order_reversed = type->reverse_byte_order; | |
116 | ||
117 | switch (size) { | |
118 | case 8: | |
119 | value = *ptr; | |
120 | break; | |
121 | case 16: | |
122 | { | |
123 | uint16_t tmp; | |
124 | tmp = *(uint16_t *) ptr; | |
125 | if (byte_order_reversed) | |
126 | tmp = bswap_16(tmp); | |
127 | ||
128 | value = tmp; | |
129 | break; | |
130 | } | |
131 | case 32: | |
132 | { | |
133 | uint32_t tmp; | |
134 | tmp = *(uint32_t *) ptr; | |
135 | if (byte_order_reversed) | |
136 | tmp = bswap_32(tmp); | |
137 | ||
138 | value = tmp; | |
139 | break; | |
140 | } | |
141 | case 64: | |
142 | { | |
143 | uint64_t tmp; | |
144 | tmp = *(uint64_t *) ptr; | |
145 | if (byte_order_reversed) | |
146 | tmp = bswap_64(tmp); | |
147 | ||
148 | value = tmp; | |
149 | break; | |
150 | } | |
151 | default: | |
152 | abort(); | |
153 | } | |
154 | ||
155 | return value; | |
156 | } | |
157 | ||
158 | static | |
159 | void capture_sequence(struct lttng_msgpack_writer *writer, | |
160 | struct lttng_interpreter_output *output) __attribute__ ((unused)); | |
161 | static | |
162 | void capture_sequence(struct lttng_msgpack_writer *writer, | |
163 | struct lttng_interpreter_output *output) | |
164 | { | |
165 | const struct lttng_integer_type *integer_type; | |
166 | const struct lttng_type *nested_type; | |
167 | uint8_t *ptr; | |
168 | bool signedness; | |
169 | int i; | |
170 | ||
171 | lttng_msgpack_begin_array(writer, output->u.sequence.nr_elem); | |
172 | ||
173 | ptr = (uint8_t *) output->u.sequence.ptr; | |
174 | nested_type = output->u.sequence.nested_type; | |
175 | switch (nested_type->atype) { | |
176 | case atype_integer: | |
177 | integer_type = &nested_type->u.integer; | |
178 | break; | |
179 | case atype_enum: | |
180 | /* Treat enumeration as an integer. */ | |
181 | integer_type = &nested_type->u.enum_nestable.container_type->u.integer; | |
182 | break; | |
183 | default: | |
184 | /* Capture of array of non-integer are not supported. */ | |
185 | abort(); | |
186 | } | |
187 | signedness = integer_type->signedness; | |
188 | for (i = 0; i < output->u.sequence.nr_elem; i++) { | |
189 | if (signedness) { | |
190 | lttng_msgpack_write_signed_integer(writer, | |
191 | capture_sequence_element_signed(ptr, integer_type)); | |
192 | } else { | |
193 | lttng_msgpack_write_unsigned_integer(writer, | |
194 | capture_sequence_element_unsigned(ptr, integer_type)); | |
195 | } | |
196 | ||
197 | /* | |
198 | * We assume that alignment is smaller or equal to the size. | |
199 | * This currently holds true but if it changes in the future, | |
200 | * we will want to change the pointer arithmetics below to | |
201 | * take into account that the next element might be further | |
202 | * away. | |
203 | */ | |
204 | assert(integer_type->alignment <= integer_type->size); | |
205 | ||
206 | /* Size is in number of bits. */ | |
207 | ptr += (integer_type->size / CHAR_BIT) ; | |
208 | } | |
209 | ||
210 | lttng_msgpack_end_array(writer); | |
211 | } | |
212 | ||
d8d2416d FD |
213 | void lttng_event_notifier_notification_send( |
214 | struct lttng_event_notifier *event_notifier) | |
215 | { | |
216 | /* | |
217 | * We want this write to be atomic AND non-blocking, meaning that we | |
218 | * want to write either everything OR nothing. | |
219 | * According to `pipe(7)`, writes that are smaller that the `PIPE_BUF` | |
220 | * value must be atomic, so we assert that the message we send is less | |
221 | * than PIPE_BUF. | |
222 | */ | |
223 | struct lttng_ust_event_notifier_notification notif; | |
224 | ssize_t ret; | |
225 | ||
226 | assert(event_notifier); | |
227 | assert(event_notifier->group); | |
228 | assert(sizeof(notif) <= PIPE_BUF); | |
229 | ||
230 | notif.token = event_notifier->user_token; | |
231 | ||
232 | ret = patient_write(event_notifier->group->notification_fd, ¬if, | |
233 | sizeof(notif)); | |
234 | if (ret == -1) { | |
235 | if (errno == EAGAIN) { | |
236 | DBG("Cannot send event notifier notification without blocking: %s", | |
237 | strerror(errno)); | |
238 | } else { | |
239 | DBG("Error to sending event notifier notification: %s", | |
240 | strerror(errno)); | |
241 | abort(); | |
242 | } | |
243 | } | |
244 | } |