ltt-sessiond/trace.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 <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <urcu/list.h>
  26
  27 #include "lttngerr.h"
  28 #include "trace.h"
  29 #include "session.h"
  30
  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 struct ltt_ust_trace *find_session_ust_trace_by_pid(struct ltt_session *session, pid_t pid)
  38 {
  39         struct ltt_ust_trace *iter;
  40
  41         cds_list_for_each_entry(iter, &session->ust_traces, list) {
  42                 if (iter->pid == pid) {
  43                         /* Found */
  44                         return iter;
  45                 }
  46         }
  47
  48         return NULL;
  49 }
  50
  51 /*
  52  *  get_trace_count_per_session
  53  *
  54  *  Return the total count of traces (ust and kernel)
  55  *  for the specified session.
  56  */
  57 int get_trace_count_per_session(struct ltt_session *session)
  58 {
  59         return session->ust_trace_count + session->kern_trace_count;
  60 }
  61
  62 /*
  63  *  get_traces_per_session
  64  *
  65  *  Fill the lttng_trace array of all the
  66  *  available trace of the session.
  67  */
  68 void get_traces_per_session(struct ltt_session *session, struct lttng_trace *traces)
  69 {
  70         int i = 0;
  71         struct ltt_ust_trace *ust_iter;
  72         struct ltt_kernel_trace *kern_iter;
  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 */
  91         cds_list_for_each_entry(kern_iter, &session->kernel_traces, list) {
  92                 trace.type = KERNEL;
  93                 strncpy(trace.name, kern_iter->name, sizeof(trace.name));
  94                 trace.name[sizeof(trace.name) - 1] = '\0';
  95                 memcpy(&traces[i], &trace, sizeof(trace));
  96                 memset(&trace, 0, sizeof(trace));
  97                 i++;
  98         }
  99 }