Remove libustctl and libustcomm
[lttng-tools.git] / ltt-sessiond / ust-ctl.c
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 <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <unistd.h>
25
26 #include "liblttsessiondcomm.h"
27 #include "lttngerr.h"
28 #include "ust-ctl.h"
29
30 #ifdef DISABLED
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 */
37 static struct ltt_ust_trace *find_session_ust_trace_by_pid(
38 struct ltt_session *session, pid_t pid)
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
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 {
60 return session->ust_trace_count;
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 /*
70 void get_traces_per_session(struct ltt_session *session, struct lttng_trace *traces)
71 {
72 int i = 0;
73 struct ltt_ust_trace *ust_iter;
74 struct lttng_trace trace;
75
76 DBG("Getting userspace traces for session %s", session->name);
77
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 if (session->kern_session_count > 0) {
91 trace.type = KERNEL;
92 strncpy(trace.name, "kernel", 6);
93 memcpy(&traces[i], &trace, sizeof(trace));
94 }
95 }
96 */
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 */
105 int ust_create_trace(struct command_ctx *cmd_ctx)
106 {
107 int ret;
108 struct ltt_ust_trace *trace;
109
110 DBG("Creating trace for pid %d", cmd_ctx->lsm->pid);
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 */
120 trace->pid = cmd_ctx->lsm->pid;
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
128 ret = ustctl_create_trace(cmd_ctx->ust_sock, trace->name);
129 if (ret < 0) {
130 ret = LTTCOMM_CREATE_FAIL;
131 goto error_create;
132 }
133
134 /* Check if current session is valid */
135 if (cmd_ctx->session) {
136 cds_list_add(&trace->list, &cmd_ctx->session->ust_traces);
137 cmd_ctx->session->ust_trace_count++;
138 }
139
140 return LTTCOMM_OK;
141
142 error_create:
143 free(trace);
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 */
154 int ust_start_trace(struct command_ctx *cmd_ctx)
155 {
156 int ret;
157 struct ltt_ust_trace *trace;
158
159 DBG("Starting trace for pid %d", cmd_ctx->lsm->pid);
160
161 trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid);
162 if (trace == NULL) {
163 ret = LTTCOMM_NO_TRACE;
164 goto error;
165 }
166
167 ret = ustctl_start_trace(cmd_ctx->ust_sock, "auto");
168 if (ret < 0) {
169 ret = LTTCOMM_START_FAIL;
170 goto error;
171 }
172
173 ret = LTTCOMM_OK;
174
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 */
185 int ust_stop_trace(struct command_ctx *cmd_ctx)
186 {
187 int ret;
188 struct ltt_ust_trace *trace;
189
190 DBG("Stopping trace for pid %d", cmd_ctx->lsm->pid);
191
192 trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid);
193 if (trace == NULL) {
194 ret = LTTCOMM_NO_TRACE;
195 goto error;
196 }
197
198 ret = ustctl_stop_trace(cmd_ctx->ust_sock, trace->name);
199 if (ret < 0) {
200 ret = LTTCOMM_STOP_FAIL;
201 goto error;
202 }
203
204 ret = LTTCOMM_OK;
205
206 error:
207 return ret;
208 }
209 #endif
210
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