memleak/lttng-malloc-stats.c

   1 /*
   2  * lttng-malloc-stats.c
   3  *
   4  * LTTng malloc stats printer
   5  *
   6  * Copyright (c) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #define _GNU_SOURCE
  24 #include <malloc.h>
  25 #include <stdio.h>
  26 #include <assert.h>
  27 #include <signal.h>
  28
  29 #define STAT_SIGNAL     SIGUSR2
  30
  31 /* Signal handler */
  32 static void sighandler(int signo, siginfo_t *siginfo, void *context)
  33 {
  34         malloc_stats();
  35 }
  36
  37 static __attribute__((constructor))
  38 void print_stats_init(void)
  39 {
  40         /* Attach signal handler on STAT_SIGNAL */
  41         struct sigaction act;
  42         int ret;
  43
  44         act.sa_sigaction = sighandler;
  45         act.sa_flags = SA_SIGINFO | SA_RESTART;
  46         sigemptyset(&act.sa_mask);
  47         ret = sigaction(STAT_SIGNAL, &act, NULL);
  48         assert(!ret);
  49 }