gdb/testsuite/gdb.base/coremaker.c

   1 /* Copyright 1992, 1993, 1994, 1995, 1996, 1999, 2007
   2    Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* Simple little program that just generates a core dump from inside some
  20    nested function calls. */
  21
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24 #include <fcntl.h>
  25 #include <sys/mman.h>
  26 #include <signal.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29
  30 #ifndef __STDC__
  31 #define const   /**/
  32 #endif
  33
  34 #define MAPSIZE (8 * 1024)
  35
  36 /* Don't make these automatic vars or we will have to walk back up the
  37    stack to access them. */
  38
  39 char *buf1;
  40 char *buf2;
  41
  42 int coremaker_data = 1; /* In Data section */
  43 int coremaker_bss;      /* In BSS section */
  44
  45 const int coremaker_ro = 201;   /* In Read-Only Data section */
  46
  47 /* Note that if the mapping fails for any reason, we set buf2
  48    to -1 and the testsuite notices this and reports it as
  49    a failure due to a mapping error.  This way we don't have
  50    to test for specific errors when running the core maker. */
  51
  52 void
  53 mmapdata ()
  54 {
  55   int j, fd;
  56
  57   /* Allocate and initialize a buffer that will be used to write
  58      the file that is later mapped in. */
  59
  60   buf1 = (char *) malloc (MAPSIZE);
  61   for (j = 0; j < MAPSIZE; ++j)
  62     {
  63       buf1[j] = j;
  64     }
  65
  66   /* Write the file to map in */
  67
  68   fd = open ("coremmap.data", O_CREAT | O_RDWR, 0666);
  69   if (fd == -1)
  70     {
  71       perror ("coremmap.data open failed");
  72       buf2 = (char *) -1;
  73       return;
  74     }
  75   write (fd, buf1, MAPSIZE);
  76
  77   /* Now map the file into our address space as buf2 */
  78
  79   buf2 = (char *) mmap (0, MAPSIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
  80   if (buf2 == (char *) -1)
  81     {
  82       perror ("mmap failed");
  83       return;
  84     }
  85
  86   /* Verify that the original data and the mapped data are identical.
  87      If not, we'd rather fail now than when trying to access the mapped
  88      data from the core file. */
  89
  90   for (j = 0; j < MAPSIZE; ++j)
  91     {
  92       if (buf1[j] != buf2[j])
  93         {
  94           fprintf (stderr, "mapped data is incorrect");
  95           buf2 = (char *) -1;
  96           return;
  97         }
  98     }
  99 }
 100
 101 void
 102 func2 ()
 103 {
 104   int coremaker_local[5];
 105   int i;
 106
 107 #ifdef SA_FULLDUMP
 108   /* Force a corefile that includes the data section for AIX.  */
 109   {
 110     struct sigaction sa;
 111
 112     sigaction (SIGABRT, (struct sigaction *)0, &sa);
 113     sa.sa_flags |= SA_FULLDUMP;
 114     sigaction (SIGABRT, &sa, (struct sigaction *)0);
 115   }
 116 #endif
 117
 118   /* Make sure that coremaker_local doesn't get optimized away. */
 119   for (i = 0; i < 5; i++)
 120     coremaker_local[i] = i;
 121   coremaker_bss = 0;
 122   for (i = 0; i < 5; i++)
 123     coremaker_bss += coremaker_local[i];
 124   coremaker_data = coremaker_ro + 1;
 125   abort ();
 126 }
 127
 128 void
 129 func1 ()
 130 {
 131   func2 ();
 132 }
 133
 134 int main ()
 135 {
 136   mmapdata ();
 137   func1 ();
 138   return 0;
 139 }
 140