Commit | Line | Data |
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022349df | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> |
022349df | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
022349df | 5 | * |
022349df MD |
6 | */ |
7 | ||
8 | #define _LGPL_SOURCE | |
9 | #include <assert.h> | |
10 | #include <inttypes.h> | |
11 | #include <string.h> | |
12 | #include <unistd.h> | |
13 | ||
14 | #include <common/defaults.h> | |
15 | #include <common/error.h> | |
16 | #include <common/utils.h> | |
17 | ||
18 | #include "clear.h" | |
19 | #include "session.h" | |
20 | #include "ust-app.h" | |
21 | #include "kernel.h" | |
22 | #include "cmd.h" | |
23 | ||
24 | struct cmd_clear_session_reply_context { | |
25 | int reply_sock_fd; | |
26 | }; | |
27 | ||
28 | static | |
29 | void cmd_clear_session_reply(const struct ltt_session *session, | |
30 | void *_reply_context) | |
31 | { | |
32 | int ret; | |
33 | ssize_t comm_ret; | |
34 | const struct cmd_clear_session_reply_context *reply_context = | |
35 | _reply_context; | |
36 | struct lttcomm_lttng_msg llm = { | |
37 | .cmd_type = LTTNG_CLEAR_SESSION, | |
38 | .ret_code = LTTNG_OK, | |
39 | .pid = UINT32_MAX, | |
40 | .cmd_header_size = 0, | |
41 | .data_size = 0, | |
42 | }; | |
43 | ||
44 | DBG("End of clear command: replying to client"); | |
45 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
46 | &llm, sizeof(llm)); | |
47 | if (comm_ret != (ssize_t) sizeof(llm)) { | |
48 | ERR("Failed to send result of session \"%s\" clear to client", | |
49 | session->name); | |
50 | } | |
51 | ret = close(reply_context->reply_sock_fd); | |
52 | if (ret) { | |
53 | PERROR("Failed to close client socket in deferred session clear reply"); | |
54 | } | |
55 | free(_reply_context); | |
56 | } | |
57 | ||
58 | int cmd_clear_session(struct ltt_session *session, int *sock_fd) | |
59 | { | |
60 | int ret = LTTNG_OK; | |
61 | struct cmd_clear_session_reply_context *reply_context = NULL; | |
62 | bool session_was_active = false; | |
63 | struct ltt_kernel_session *ksession; | |
64 | struct ltt_ust_session *usess; | |
65 | ||
66 | ksession = session->kernel_session; | |
67 | usess = session->ust_session; | |
68 | ||
69 | if (sock_fd) { | |
70 | reply_context = zmalloc(sizeof(*reply_context)); | |
71 | if (!reply_context) { | |
72 | ret = LTTNG_ERR_NOMEM; | |
73 | goto end; | |
74 | } | |
75 | reply_context->reply_sock_fd = *sock_fd; | |
76 | } | |
77 | ||
78 | if (!session->has_been_started) { | |
79 | /* | |
80 | * Nothing to be cleared, this is not an error: there is | |
81 | * indeed nothing to do, and there is no reason why we | |
82 | * should return an error to the user. | |
83 | */ | |
84 | goto end; | |
85 | } | |
86 | ||
87 | /* Unsupported feature in lttng-relayd before 2.11. */ | |
88 | if (session->consumer->type == CONSUMER_DST_NET && | |
89 | (session->consumer->relay_major_version == 2 && | |
90 | session->consumer->relay_minor_version < 12)) { | |
91 | ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY; | |
92 | goto end; | |
93 | } | |
94 | if (session->consumer->type == CONSUMER_DST_NET && | |
95 | !session->consumer->relay_allows_clear) { | |
96 | ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY; | |
97 | goto end; | |
98 | } | |
99 | ||
100 | /* | |
101 | * After a stop followed by a clear, all subsequent clear are | |
102 | * effect-less until start is performed. | |
103 | */ | |
104 | if (session->cleared_after_last_stop) { | |
105 | ret = LTTNG_OK; | |
106 | goto end; | |
107 | } | |
108 | ||
109 | /* | |
110 | * After a stop followed by a rotation, all subsequent clear are effect-less | |
111 | * until start is performed. | |
112 | */ | |
113 | if (session->rotated_after_last_stop) { | |
114 | ret = LTTNG_OK; | |
115 | goto end; | |
116 | } | |
117 | ||
118 | session_was_active = session->active; | |
119 | if (session_was_active) { | |
120 | ret = stop_kernel_session(ksession); | |
121 | if (ret != LTTNG_OK) { | |
122 | goto end; | |
123 | } | |
124 | if (usess && usess->active) { | |
125 | ret = ust_app_stop_trace_all(usess); | |
126 | if (ret < 0) { | |
127 | ret = LTTNG_ERR_UST_STOP_FAIL; | |
128 | goto end; | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | /* | |
134 | * Clear active kernel and UST session buffers. | |
135 | */ | |
136 | if (session->kernel_session) { | |
137 | ret = kernel_clear_session(session); | |
138 | if (ret != LTTNG_OK) { | |
139 | goto end; | |
140 | } | |
141 | } | |
142 | if (session->ust_session) { | |
143 | ret = ust_app_clear_session(session); | |
144 | if (ret != LTTNG_OK) { | |
145 | goto end; | |
146 | } | |
147 | } | |
148 | ||
149 | if (session->output_traces) { | |
150 | /* | |
151 | * Use rotation to delete local and remote stream files. | |
152 | */ | |
153 | if (reply_context) { | |
154 | ret = session_add_clear_notifier(session, | |
155 | cmd_clear_session_reply, | |
156 | (void *) reply_context); | |
157 | if (ret) { | |
158 | ret = LTTNG_ERR_FATAL; | |
159 | goto end; | |
160 | } | |
161 | /* | |
162 | * On success, ownership of reply_context has been | |
163 | * passed to session_add_clear_notifier(). | |
164 | */ | |
165 | reply_context = NULL; | |
166 | *sock_fd = -1; | |
167 | } | |
168 | ret = cmd_rotate_session(session, NULL, true, | |
169 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE); | |
170 | if (ret != LTTNG_OK) { | |
171 | goto end; | |
172 | } | |
173 | } | |
174 | if (!session->active) { | |
175 | session->cleared_after_last_stop = true; | |
176 | } | |
177 | if (session_was_active) { | |
178 | /* Kernel tracing */ | |
179 | if (ksession != NULL) { | |
180 | DBG("Start kernel tracing session \"%s\"", | |
181 | session->name); | |
182 | ret = start_kernel_session(ksession); | |
183 | if (ret != LTTNG_OK) { | |
184 | goto end; | |
185 | } | |
186 | } | |
187 | ||
188 | /* Flag session that trace should start automatically */ | |
189 | if (usess) { | |
190 | int int_ret = ust_app_start_trace_all(usess); | |
191 | ||
192 | if (int_ret < 0) { | |
193 | ret = LTTNG_ERR_UST_START_FAIL; | |
194 | goto end; | |
195 | } | |
196 | } | |
04ed9e10 JG |
197 | |
198 | /* | |
199 | * Open a packet in every stream of the session to ensure that | |
200 | * viewers can correctly identify the boundaries of the periods | |
201 | * during which tracing was active for this session. | |
202 | */ | |
203 | ret = session_open_packets(session); | |
204 | if (ret != LTTNG_OK) { | |
205 | goto end; | |
206 | } | |
022349df MD |
207 | } |
208 | ret = LTTNG_OK; | |
209 | end: | |
210 | free(reply_context); | |
211 | return ret; | |
212 | } |