debug/tst-backtrace4.c

   1 /* Test backtrace and backtrace_symbols for signal frames.
   2    Copyright (C) 2011-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <execinfo.h>
  20 #include <search.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <signal.h>
  26 #include <unistd.h>
  27
  28 #include "tst-backtrace.h"
  29
  30 static int do_test (void);
  31 #define TEST_FUNCTION do_test ()
  32 #include "../test-skeleton.c"
  33
  34 /* The backtrace should include at least handle_signal, a signal
  35    trampoline, 3 * fn, and do_test.  */
  36 #define NUM_FUNCTIONS 6
  37
  38 volatile int sig_handled = 0;
  39
  40 void
  41 handle_signal (int signum)
  42 {
  43   void *addresses[NUM_FUNCTIONS];
  44   char **symbols;
  45   int n;
  46   int i;
  47
  48   sig_handled = 1;
  49
  50   /* Get the backtrace addresses.  */
  51   n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
  52   printf ("Obtained backtrace with %d functions\n", n);
  53   /*  Check that there are at least six functions.  */
  54   if (n < NUM_FUNCTIONS)
  55     {
  56       FAIL ();
  57       return;
  58     }
  59   /* Convert them to symbols.  */
  60   symbols = backtrace_symbols (addresses, n);
  61   /* Check that symbols were obtained.  */
  62   if (symbols == NULL)
  63     {
  64       FAIL ();
  65       return;
  66     }
  67   for (i = 0; i < n; ++i)
  68     printf ("Function %d: %s\n", i, symbols[i]);
  69   /* Check that the function names obtained are accurate.  */
  70   if (!match (symbols[0], "handle_signal"))
  71     {
  72       FAIL ();
  73       return;
  74     }
  75   /* Do not check name for signal trampoline.  */
  76   for (i = 2; i < n - 1; i++)
  77     if (!match (symbols[i], "fn"))
  78       {
  79         FAIL ();
  80         return;
  81       }
  82   /* Symbol names are not available for static functions, so we do not
  83      check do_test.  */
  84 }
  85
  86 NO_INLINE int
  87 fn (int c)
  88 {
  89   pid_t parent_pid, child_pid;
  90
  91   if (c > 0)
  92     {
  93       fn (c - 1);
  94       return x;
  95     }
  96
  97   signal (SIGUSR1, handle_signal);
  98   parent_pid = getpid ();
  99
 100   child_pid = fork ();
 101   if (child_pid == (pid_t) -1)
 102     abort ();
 103   else if (child_pid == 0)
 104     {
 105       sleep (1);
 106       kill (parent_pid, SIGUSR1);
 107       _exit (0);
 108     }
 109
 110   /* In the parent.  */
 111   while (sig_handled == 0)
 112     ;
 113
 114   return 0;
 115 }
 116
 117 NO_INLINE static int
 118 do_test (void)
 119 {
 120   fn (2);
 121   return ret;
 122 }