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d4a2a84a DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <errno.h> | |
d4a2a84a | 21 | #include <stdlib.h> |
baa0e4a9 | 22 | #include <stdio.h> |
1657e9bb | 23 | #include <string.h> |
baa0e4a9 DG |
24 | #include <unistd.h> |
25 | ||
62d3069f | 26 | #include "libustctl.h" |
471d1693 | 27 | #include "liblttsessiondcomm.h" |
d4a2a84a | 28 | #include "lttngerr.h" |
baa0e4a9 | 29 | #include "ust-ctl.h" |
471d1693 | 30 | |
d4a2a84a DG |
31 | /* |
32 | * find_session_ust_trace_by_pid | |
33 | * | |
34 | * Iterate over the session ust_traces and | |
35 | * return a pointer or NULL if not found. | |
36 | */ | |
471d1693 DG |
37 | static struct ltt_ust_trace *find_session_ust_trace_by_pid( |
38 | struct ltt_session *session, pid_t pid) | |
d4a2a84a DG |
39 | { |
40 | struct ltt_ust_trace *iter; | |
41 | ||
42 | cds_list_for_each_entry(iter, &session->ust_traces, list) { | |
43 | if (iter->pid == pid) { | |
44 | /* Found */ | |
45 | return iter; | |
46 | } | |
47 | } | |
48 | ||
49 | return NULL; | |
50 | } | |
51 | ||
1657e9bb DG |
52 | /* |
53 | * get_trace_count_per_session | |
54 | * | |
55 | * Return the total count of traces (ust and kernel) | |
56 | * for the specified session. | |
57 | */ | |
58 | int get_trace_count_per_session(struct ltt_session *session) | |
59 | { | |
20fe2104 | 60 | return session->ust_trace_count + session->kern_session_count; |
1657e9bb DG |
61 | } |
62 | ||
63 | /* | |
64 | * get_traces_per_session | |
65 | * | |
66 | * Fill the lttng_trace array of all the | |
67 | * available trace of the session. | |
68 | */ | |
69 | void get_traces_per_session(struct ltt_session *session, struct lttng_trace *traces) | |
70 | { | |
71 | int i = 0; | |
72 | struct ltt_ust_trace *ust_iter; | |
1657e9bb DG |
73 | struct lttng_trace trace; |
74 | ||
75 | DBG("Getting userspace traces for session %s", session->name); | |
76 | ||
77 | /* Getting userspace traces */ | |
78 | cds_list_for_each_entry(ust_iter, &session->ust_traces, list) { | |
79 | trace.type = USERSPACE; | |
80 | trace.pid = ust_iter->pid; | |
81 | strncpy(trace.name, ust_iter->name, sizeof(trace.name)); | |
82 | trace.name[sizeof(trace.name) - 1] = '\0'; | |
83 | memcpy(&traces[i], &trace, sizeof(trace)); | |
84 | memset(&trace, 0, sizeof(trace)); | |
85 | i++; | |
86 | } | |
87 | ||
88 | DBG("Getting kernel traces for session %s", session->name); | |
89 | ||
90 | /* Getting kernel traces */ | |
20fe2104 | 91 | if (session->kern_session_count > 0) { |
1657e9bb | 92 | trace.type = KERNEL; |
20fe2104 | 93 | strncpy(trace.name, "kernel", 6); |
1657e9bb | 94 | memcpy(&traces[i], &trace, sizeof(trace)); |
1657e9bb DG |
95 | } |
96 | } | |
471d1693 DG |
97 | |
98 | /* | |
99 | * ust_create_trace | |
100 | * | |
101 | * Create an userspace trace using pid. | |
102 | * This trace is then appended to the current session | |
103 | * ust trace list. | |
104 | */ | |
5461b305 | 105 | int ust_create_trace(struct command_ctx *cmd_ctx) |
471d1693 DG |
106 | { |
107 | int ret; | |
108 | struct ltt_ust_trace *trace; | |
109 | ||
5461b305 | 110 | DBG("Creating trace for pid %d", cmd_ctx->lsm->pid); |
471d1693 DG |
111 | |
112 | trace = malloc(sizeof(struct ltt_ust_trace)); | |
113 | if (trace == NULL) { | |
114 | perror("malloc"); | |
115 | ret = -1; | |
116 | goto error; | |
117 | } | |
118 | ||
119 | /* Init */ | |
5461b305 | 120 | trace->pid = cmd_ctx->lsm->pid; |
471d1693 DG |
121 | trace->shmid = 0; |
122 | /* NOTE: to be removed. Trace name will no longer be | |
123 | * required for LTTng userspace tracer. For now, we set it | |
124 | * to 'auto' for API compliance. | |
125 | */ | |
126 | snprintf(trace->name, 5, "auto"); | |
127 | ||
5461b305 | 128 | ret = ustctl_create_trace(cmd_ctx->ust_sock, trace->name); |
471d1693 DG |
129 | if (ret < 0) { |
130 | ret = LTTCOMM_CREATE_FAIL; | |
a55dd136 | 131 | goto error_create; |
471d1693 DG |
132 | } |
133 | ||
134 | /* Check if current session is valid */ | |
5461b305 DG |
135 | if (cmd_ctx->session) { |
136 | cds_list_add(&trace->list, &cmd_ctx->session->ust_traces); | |
137 | cmd_ctx->session->ust_trace_count++; | |
471d1693 | 138 | } |
a55dd136 | 139 | |
5461b305 | 140 | return LTTCOMM_OK; |
471d1693 | 141 | |
5e16da05 MD |
142 | error_create: |
143 | free(trace); | |
471d1693 DG |
144 | error: |
145 | return ret; | |
146 | } | |
147 | ||
148 | /* | |
149 | * ust_start_trace | |
150 | * | |
151 | * Start a trace. This trace, identified by the pid, must be | |
152 | * in the current session ust_traces list. | |
153 | */ | |
5461b305 | 154 | int ust_start_trace(struct command_ctx *cmd_ctx) |
471d1693 DG |
155 | { |
156 | int ret; | |
157 | struct ltt_ust_trace *trace; | |
158 | ||
5461b305 | 159 | DBG("Starting trace for pid %d", cmd_ctx->lsm->pid); |
471d1693 | 160 | |
5461b305 | 161 | trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid); |
471d1693 DG |
162 | if (trace == NULL) { |
163 | ret = LTTCOMM_NO_TRACE; | |
164 | goto error; | |
165 | } | |
166 | ||
5461b305 | 167 | ret = ustctl_start_trace(cmd_ctx->ust_sock, "auto"); |
471d1693 DG |
168 | if (ret < 0) { |
169 | ret = LTTCOMM_START_FAIL; | |
170 | goto error; | |
171 | } | |
172 | ||
5461b305 DG |
173 | ret = LTTCOMM_OK; |
174 | ||
471d1693 DG |
175 | error: |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * ust_stop_trace | |
181 | * | |
182 | * Stop a trace. This trace, identified by the pid, must be | |
183 | * in the current session ust_traces list. | |
184 | */ | |
5461b305 | 185 | int ust_stop_trace(struct command_ctx *cmd_ctx) |
471d1693 DG |
186 | { |
187 | int ret; | |
188 | struct ltt_ust_trace *trace; | |
189 | ||
5461b305 | 190 | DBG("Stopping trace for pid %d", cmd_ctx->lsm->pid); |
471d1693 | 191 | |
5461b305 | 192 | trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid); |
471d1693 DG |
193 | if (trace == NULL) { |
194 | ret = LTTCOMM_NO_TRACE; | |
195 | goto error; | |
196 | } | |
197 | ||
5461b305 | 198 | ret = ustctl_stop_trace(cmd_ctx->ust_sock, trace->name); |
471d1693 DG |
199 | if (ret < 0) { |
200 | ret = LTTCOMM_STOP_FAIL; | |
201 | goto error; | |
202 | } | |
203 | ||
5461b305 DG |
204 | ret = LTTCOMM_OK; |
205 | ||
471d1693 DG |
206 | error: |
207 | return ret; | |
208 | } | |
209 |