| 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; only version 2 |
| 7 | * of the License. |
| 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 <lttng-sessiond-comm.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", sizeof(trace.name)); |
| 93 | trace.name[sizeof(trace.name) - 1] = '\0'; |
| 94 | memcpy(&traces[i], &trace, sizeof(trace)); |
| 95 | } |
| 96 | } |
| 97 | */ |
| 98 | |
| 99 | /* |
| 100 | * ust_create_trace |
| 101 | * |
| 102 | * Create an userspace trace using pid. |
| 103 | * This trace is then appended to the current session |
| 104 | * ust trace list. |
| 105 | */ |
| 106 | int ust_create_trace(struct command_ctx *cmd_ctx) |
| 107 | { |
| 108 | int ret; |
| 109 | struct ltt_ust_trace *trace; |
| 110 | |
| 111 | DBG("Creating trace for pid %d", cmd_ctx->lsm->pid); |
| 112 | |
| 113 | trace = malloc(sizeof(struct ltt_ust_trace)); |
| 114 | if (trace == NULL) { |
| 115 | perror("malloc"); |
| 116 | ret = -1; |
| 117 | goto error; |
| 118 | } |
| 119 | |
| 120 | /* Init */ |
| 121 | trace->pid = cmd_ctx->lsm->pid; |
| 122 | trace->shmid = 0; |
| 123 | /* NOTE: to be removed. Trace name will no longer be |
| 124 | * required for LTTng userspace tracer. For now, we set it |
| 125 | * to 'auto' for API compliance. |
| 126 | */ |
| 127 | snprintf(trace->name, 5, "auto"); |
| 128 | |
| 129 | ret = ustctl_create_trace(cmd_ctx->ust_sock, trace->name); |
| 130 | if (ret < 0) { |
| 131 | ret = LTTCOMM_CREATE_FAIL; |
| 132 | goto error_create; |
| 133 | } |
| 134 | |
| 135 | /* Check if current session is valid */ |
| 136 | if (cmd_ctx->session) { |
| 137 | cds_list_add(&trace->list, &cmd_ctx->session->ust_traces); |
| 138 | cmd_ctx->session->ust_trace_count++; |
| 139 | } |
| 140 | |
| 141 | return LTTCOMM_OK; |
| 142 | |
| 143 | error_create: |
| 144 | free(trace); |
| 145 | error: |
| 146 | return ret; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * ust_start_trace |
| 151 | * |
| 152 | * Start a trace. This trace, identified by the pid, must be |
| 153 | * in the current session ust_traces list. |
| 154 | */ |
| 155 | int ust_start_trace(struct command_ctx *cmd_ctx) |
| 156 | { |
| 157 | int ret; |
| 158 | struct ltt_ust_trace *trace; |
| 159 | |
| 160 | DBG("Starting trace for pid %d", cmd_ctx->lsm->pid); |
| 161 | |
| 162 | trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid); |
| 163 | if (trace == NULL) { |
| 164 | ret = LTTCOMM_NO_TRACE; |
| 165 | goto error; |
| 166 | } |
| 167 | |
| 168 | ret = ustctl_start_trace(cmd_ctx->ust_sock, "auto"); |
| 169 | if (ret < 0) { |
| 170 | ret = LTTCOMM_START_FAIL; |
| 171 | goto error; |
| 172 | } |
| 173 | |
| 174 | ret = LTTCOMM_OK; |
| 175 | |
| 176 | error: |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * ust_stop_trace |
| 182 | * |
| 183 | * Stop a trace. This trace, identified by the pid, must be |
| 184 | * in the current session ust_traces list. |
| 185 | */ |
| 186 | int ust_stop_trace(struct command_ctx *cmd_ctx) |
| 187 | { |
| 188 | int ret; |
| 189 | struct ltt_ust_trace *trace; |
| 190 | |
| 191 | DBG("Stopping trace for pid %d", cmd_ctx->lsm->pid); |
| 192 | |
| 193 | trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid); |
| 194 | if (trace == NULL) { |
| 195 | ret = LTTCOMM_NO_TRACE; |
| 196 | goto error; |
| 197 | } |
| 198 | |
| 199 | ret = ustctl_stop_trace(cmd_ctx->ust_sock, trace->name); |
| 200 | if (ret < 0) { |
| 201 | ret = LTTCOMM_STOP_FAIL; |
| 202 | goto error; |
| 203 | } |
| 204 | |
| 205 | ret = LTTCOMM_OK; |
| 206 | |
| 207 | error: |
| 208 | return ret; |
| 209 | } |
| 210 | #endif |
| 211 | |