usertrace/lttng_usertrace.c

   1
   2 /* LTTng user-space tracing code
   3  *
   4  * Copyright 2006 Mathieu Desnoyers
   5  *
   6  */
   7
   8
   9 #include <sys/types.h>
  10 #include <sys/wait.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <signal.h>
  14 #include <syscall.h>
  15
  16 #include "lttng_usertrace.h"
  17
  18 /* signal handler */
  19 void __lttng_sig_trace_handler(int signo)
  20 {
  21   printf("LTTng Sig handler : pid : %lu\n", getpid());
  22 }
  23
  24
  25
  26 void __attribute__((constructor)) __lttng_user_init(void)
  27 {
  28         static struct sigaction act;
  29         int err;
  30
  31   printf("LTTng user init\n");
  32
  33         /* Activate the signal */
  34         act.sa_handler = __lttng_sig_trace_handler;
  35         err = sigemptyset(&(act.sa_mask));
  36         if(err) perror("Error with sigemptyset");
  37         err = sigaddset(&(act.sa_mask), SIGRTMIN+3);
  38         if(err) perror("Error with sigaddset");
  39         err = sigaction(SIGRTMIN+3, &act, NULL);
  40         if(err) perror("Error with sigaction");
  41
  42         /* Make the first ltt_update system call */
  43         err = ltt_update(1, NULL, NULL);
  44         if(err) {
  45                 printf("Error in ltt_update system call\n");
  46                 exit(1);
  47         }
  48 }