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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> | |
21 | #include <limits.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
1657e9bb | 24 | #include <string.h> |
d4a2a84a | 25 | #include <urcu/list.h> |
471d1693 | 26 | #include <ust/ustctl.h> |
d4a2a84a | 27 | |
471d1693 | 28 | #include "liblttsessiondcomm.h" |
d4a2a84a DG |
29 | #include "lttngerr.h" |
30 | #include "trace.h" | |
31 | #include "session.h" | |
32 | ||
471d1693 DG |
33 | static struct ltt_ust_trace *find_session_ust_trace_by_pid( |
34 | struct ltt_session *session, pid_t pid); | |
35 | ||
d4a2a84a DG |
36 | /* |
37 | * find_session_ust_trace_by_pid | |
38 | * | |
39 | * Iterate over the session ust_traces and | |
40 | * return a pointer or NULL if not found. | |
41 | */ | |
471d1693 DG |
42 | static struct ltt_ust_trace *find_session_ust_trace_by_pid( |
43 | struct ltt_session *session, pid_t pid) | |
d4a2a84a DG |
44 | { |
45 | struct ltt_ust_trace *iter; | |
46 | ||
47 | cds_list_for_each_entry(iter, &session->ust_traces, list) { | |
48 | if (iter->pid == pid) { | |
49 | /* Found */ | |
50 | return iter; | |
51 | } | |
52 | } | |
53 | ||
54 | return NULL; | |
55 | } | |
56 | ||
1657e9bb DG |
57 | /* |
58 | * get_trace_count_per_session | |
59 | * | |
60 | * Return the total count of traces (ust and kernel) | |
61 | * for the specified session. | |
62 | */ | |
63 | int get_trace_count_per_session(struct ltt_session *session) | |
64 | { | |
65 | return session->ust_trace_count + session->kern_trace_count; | |
66 | } | |
67 | ||
68 | /* | |
69 | * get_traces_per_session | |
70 | * | |
71 | * Fill the lttng_trace array of all the | |
72 | * available trace of the session. | |
73 | */ | |
74 | void get_traces_per_session(struct ltt_session *session, struct lttng_trace *traces) | |
75 | { | |
76 | int i = 0; | |
77 | struct ltt_ust_trace *ust_iter; | |
78 | struct ltt_kernel_trace *kern_iter; | |
79 | struct lttng_trace trace; | |
80 | ||
81 | DBG("Getting userspace traces for session %s", session->name); | |
82 | ||
83 | /* Getting userspace traces */ | |
84 | cds_list_for_each_entry(ust_iter, &session->ust_traces, list) { | |
85 | trace.type = USERSPACE; | |
86 | trace.pid = ust_iter->pid; | |
87 | strncpy(trace.name, ust_iter->name, sizeof(trace.name)); | |
88 | trace.name[sizeof(trace.name) - 1] = '\0'; | |
89 | memcpy(&traces[i], &trace, sizeof(trace)); | |
90 | memset(&trace, 0, sizeof(trace)); | |
91 | i++; | |
92 | } | |
93 | ||
94 | DBG("Getting kernel traces for session %s", session->name); | |
95 | ||
96 | /* Getting kernel traces */ | |
97 | cds_list_for_each_entry(kern_iter, &session->kernel_traces, list) { | |
98 | trace.type = KERNEL; | |
99 | strncpy(trace.name, kern_iter->name, sizeof(trace.name)); | |
100 | trace.name[sizeof(trace.name) - 1] = '\0'; | |
101 | memcpy(&traces[i], &trace, sizeof(trace)); | |
102 | memset(&trace, 0, sizeof(trace)); | |
103 | i++; | |
104 | } | |
105 | } | |
471d1693 DG |
106 | |
107 | /* | |
108 | * ust_create_trace | |
109 | * | |
110 | * Create an userspace trace using pid. | |
111 | * This trace is then appended to the current session | |
112 | * ust trace list. | |
113 | */ | |
114 | int ust_create_trace(int sock, pid_t pid) | |
115 | { | |
116 | int ret; | |
117 | struct ltt_ust_trace *trace; | |
118 | ||
119 | DBG("Creating trace for pid %d", pid); | |
120 | ||
121 | trace = malloc(sizeof(struct ltt_ust_trace)); | |
122 | if (trace == NULL) { | |
123 | perror("malloc"); | |
124 | ret = -1; | |
125 | goto error; | |
126 | } | |
127 | ||
128 | /* Init */ | |
129 | trace->pid = pid; | |
130 | trace->shmid = 0; | |
131 | /* NOTE: to be removed. Trace name will no longer be | |
132 | * required for LTTng userspace tracer. For now, we set it | |
133 | * to 'auto' for API compliance. | |
134 | */ | |
135 | snprintf(trace->name, 5, "auto"); | |
136 | ||
137 | ret = ustctl_create_trace(sock, trace->name); | |
138 | if (ret < 0) { | |
139 | ret = LTTCOMM_CREATE_FAIL; | |
a55dd136 | 140 | goto error_create; |
471d1693 DG |
141 | } |
142 | ||
143 | /* Check if current session is valid */ | |
144 | if (current_session) { | |
145 | cds_list_add(&trace->list, ¤t_session->ust_traces); | |
146 | current_session->ust_trace_count++; | |
147 | } | |
a55dd136 | 148 | |
5e16da05 | 149 | return 0; |
471d1693 | 150 | |
5e16da05 MD |
151 | error_create: |
152 | free(trace); | |
471d1693 DG |
153 | error: |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
158 | * ust_start_trace | |
159 | * | |
160 | * Start a trace. This trace, identified by the pid, must be | |
161 | * in the current session ust_traces list. | |
162 | */ | |
163 | int ust_start_trace(int sock, pid_t pid) | |
164 | { | |
165 | int ret; | |
166 | struct ltt_ust_trace *trace; | |
167 | ||
168 | DBG("Starting trace for pid %d", pid); | |
169 | ||
170 | trace = find_session_ust_trace_by_pid(current_session, pid); | |
171 | if (trace == NULL) { | |
172 | ret = LTTCOMM_NO_TRACE; | |
173 | goto error; | |
174 | } | |
175 | ||
176 | ret = ustctl_start_trace(sock, "auto"); | |
177 | if (ret < 0) { | |
178 | ret = LTTCOMM_START_FAIL; | |
179 | goto error; | |
180 | } | |
181 | ||
182 | error: | |
183 | return ret; | |
184 | } | |
185 | ||
186 | /* | |
187 | * ust_stop_trace | |
188 | * | |
189 | * Stop a trace. This trace, identified by the pid, must be | |
190 | * in the current session ust_traces list. | |
191 | */ | |
192 | int ust_stop_trace(int sock, pid_t pid) | |
193 | { | |
194 | int ret; | |
195 | struct ltt_ust_trace *trace; | |
196 | ||
197 | DBG("Stopping trace for pid %d", pid); | |
198 | ||
199 | trace = find_session_ust_trace_by_pid(current_session, pid); | |
200 | if (trace == NULL) { | |
201 | ret = LTTCOMM_NO_TRACE; | |
202 | goto error; | |
203 | } | |
204 | ||
205 | ret = ustctl_stop_trace(sock, trace->name); | |
206 | if (ret < 0) { | |
207 | ret = LTTCOMM_STOP_FAIL; | |
208 | goto error; | |
209 | } | |
210 | ||
211 | error: | |
212 | return ret; | |
213 | } | |
214 |