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 | |
28ab034a JG |
9 | #include "clear.hpp" |
10 | #include "cmd.hpp" | |
11 | #include "kernel.hpp" | |
12 | #include "session.hpp" | |
13 | #include "ust-app.hpp" | |
022349df | 14 | |
c9e313bc SM |
15 | #include <common/defaults.hpp> |
16 | #include <common/error.hpp> | |
17 | #include <common/utils.hpp> | |
022349df | 18 | |
28ab034a JG |
19 | #include <inttypes.h> |
20 | #include <string.h> | |
21 | #include <unistd.h> | |
022349df | 22 | |
f1494934 | 23 | namespace { |
022349df MD |
24 | struct cmd_clear_session_reply_context { |
25 | int reply_sock_fd; | |
26 | }; | |
f1494934 | 27 | } /* namespace */ |
022349df | 28 | |
a0a4f314 | 29 | static void cmd_clear_session_reply(const ltt_session::locked_ref& session, void *_reply_context) |
022349df MD |
30 | { |
31 | int ret; | |
32 | ssize_t comm_ret; | |
33 | const struct cmd_clear_session_reply_context *reply_context = | |
28ab034a | 34 | (cmd_clear_session_reply_context *) _reply_context; |
022349df | 35 | struct lttcomm_lttng_msg llm = { |
37a5ef39 | 36 | .cmd_type = LTTCOMM_SESSIOND_COMMAND_CLEAR_SESSION, |
022349df MD |
37 | .ret_code = LTTNG_OK, |
38 | .pid = UINT32_MAX, | |
39 | .cmd_header_size = 0, | |
40 | .data_size = 0, | |
1c9a0b0e | 41 | .fd_count = 0, |
022349df MD |
42 | }; |
43 | ||
44 | DBG("End of clear command: replying to client"); | |
28ab034a | 45 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, &llm, sizeof(llm)); |
022349df | 46 | if (comm_ret != (ssize_t) sizeof(llm)) { |
28ab034a | 47 | ERR("Failed to send result of session \"%s\" clear to client", session->name); |
022349df MD |
48 | } |
49 | ret = close(reply_context->reply_sock_fd); | |
50 | if (ret) { | |
51 | PERROR("Failed to close client socket in deferred session clear reply"); | |
52 | } | |
53 | free(_reply_context); | |
54 | } | |
55 | ||
a0a4f314 | 56 | int cmd_clear_session(const ltt_session::locked_ref& session, int *sock_fd) |
022349df MD |
57 | { |
58 | int ret = LTTNG_OK; | |
cd9adb8b | 59 | struct cmd_clear_session_reply_context *reply_context = nullptr; |
022349df MD |
60 | bool session_was_active = false; |
61 | struct ltt_kernel_session *ksession; | |
62 | struct ltt_ust_session *usess; | |
63 | ||
64 | ksession = session->kernel_session; | |
65 | usess = session->ust_session; | |
66 | ||
67 | if (sock_fd) { | |
64803277 | 68 | reply_context = zmalloc<cmd_clear_session_reply_context>(); |
022349df MD |
69 | if (!reply_context) { |
70 | ret = LTTNG_ERR_NOMEM; | |
71 | goto end; | |
72 | } | |
73 | reply_context->reply_sock_fd = *sock_fd; | |
74 | } | |
75 | ||
76 | if (!session->has_been_started) { | |
28ab034a JG |
77 | /* |
78 | * Nothing to be cleared, this is not an error: there is | |
79 | * indeed nothing to do, and there is no reason why we | |
80 | * should return an error to the user. | |
81 | */ | |
82 | goto end; | |
022349df MD |
83 | } |
84 | ||
85 | /* Unsupported feature in lttng-relayd before 2.11. */ | |
86 | if (session->consumer->type == CONSUMER_DST_NET && | |
28ab034a JG |
87 | (session->consumer->relay_major_version == 2 && |
88 | session->consumer->relay_minor_version < 12)) { | |
022349df MD |
89 | ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY; |
90 | goto end; | |
91 | } | |
28ab034a | 92 | if (session->consumer->type == CONSUMER_DST_NET && !session->consumer->relay_allows_clear) { |
022349df MD |
93 | ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY; |
94 | goto end; | |
95 | } | |
96 | ||
97 | /* | |
98 | * After a stop followed by a clear, all subsequent clear are | |
99 | * effect-less until start is performed. | |
100 | */ | |
101 | if (session->cleared_after_last_stop) { | |
102 | ret = LTTNG_OK; | |
103 | goto end; | |
104 | } | |
105 | ||
106 | /* | |
107 | * After a stop followed by a rotation, all subsequent clear are effect-less | |
108 | * until start is performed. | |
109 | */ | |
110 | if (session->rotated_after_last_stop) { | |
111 | ret = LTTNG_OK; | |
112 | goto end; | |
113 | } | |
114 | ||
115 | session_was_active = session->active; | |
116 | if (session_was_active) { | |
117 | ret = stop_kernel_session(ksession); | |
118 | if (ret != LTTNG_OK) { | |
119 | goto end; | |
120 | } | |
121 | if (usess && usess->active) { | |
122 | ret = ust_app_stop_trace_all(usess); | |
123 | if (ret < 0) { | |
124 | ret = LTTNG_ERR_UST_STOP_FAIL; | |
125 | goto end; | |
126 | } | |
127 | } | |
128 | } | |
129 | ||
130 | /* | |
131 | * Clear active kernel and UST session buffers. | |
132 | */ | |
133 | if (session->kernel_session) { | |
134 | ret = kernel_clear_session(session); | |
135 | if (ret != LTTNG_OK) { | |
136 | goto end; | |
137 | } | |
138 | } | |
139 | if (session->ust_session) { | |
140 | ret = ust_app_clear_session(session); | |
141 | if (ret != LTTNG_OK) { | |
142 | goto end; | |
143 | } | |
144 | } | |
145 | ||
146 | if (session->output_traces) { | |
147 | /* | |
148 | * Use rotation to delete local and remote stream files. | |
149 | */ | |
150 | if (reply_context) { | |
28ab034a JG |
151 | ret = session_add_clear_notifier( |
152 | session, cmd_clear_session_reply, (void *) reply_context); | |
022349df MD |
153 | if (ret) { |
154 | ret = LTTNG_ERR_FATAL; | |
155 | goto end; | |
156 | } | |
157 | /* | |
158 | * On success, ownership of reply_context has been | |
159 | * passed to session_add_clear_notifier(). | |
160 | */ | |
cd9adb8b | 161 | reply_context = nullptr; |
022349df MD |
162 | *sock_fd = -1; |
163 | } | |
28ab034a | 164 | ret = cmd_rotate_session( |
cd9adb8b | 165 | session, nullptr, true, LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE); |
022349df MD |
166 | if (ret != LTTNG_OK) { |
167 | goto end; | |
168 | } | |
169 | } | |
170 | if (!session->active) { | |
171 | session->cleared_after_last_stop = true; | |
172 | } | |
173 | if (session_was_active) { | |
174 | /* Kernel tracing */ | |
cd9adb8b | 175 | if (ksession != nullptr) { |
28ab034a | 176 | DBG("Start kernel tracing session \"%s\"", session->name); |
022349df MD |
177 | ret = start_kernel_session(ksession); |
178 | if (ret != LTTNG_OK) { | |
179 | goto end; | |
180 | } | |
181 | } | |
182 | ||
183 | /* Flag session that trace should start automatically */ | |
184 | if (usess) { | |
185 | int int_ret = ust_app_start_trace_all(usess); | |
186 | ||
187 | if (int_ret < 0) { | |
188 | ret = LTTNG_ERR_UST_START_FAIL; | |
189 | goto end; | |
190 | } | |
191 | } | |
04ed9e10 JG |
192 | |
193 | /* | |
194 | * Open a packet in every stream of the session to ensure that | |
195 | * viewers can correctly identify the boundaries of the periods | |
196 | * during which tracing was active for this session. | |
197 | */ | |
198 | ret = session_open_packets(session); | |
199 | if (ret != LTTNG_OK) { | |
200 | goto end; | |
201 | } | |
022349df MD |
202 | } |
203 | ret = LTTNG_OK; | |
204 | end: | |
205 | free(reply_context); | |
206 | return ret; | |
207 | } |