gdb/testsuite/gdb.base/coremaker.c

   1 /* Copyright 1992-2019 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Simple little program that just generates a core dump from inside some
  19    nested function calls. */
  20
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <fcntl.h>
  24 #include <sys/mman.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.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   /* Touch buf2 so kernel writes it out into 'core'. */
 100   buf2[0] = buf1[0];
 101 }
 102
 103 void
 104 func2 ()
 105 {
 106   int coremaker_local[5];
 107   int i;
 108
 109 #ifdef SA_FULLDUMP
 110   /* Force a corefile that includes the data section for AIX.  */
 111   {
 112     struct sigaction sa;
 113
 114     sigaction (SIGABRT, (struct sigaction *)0, &sa);
 115     sa.sa_flags |= SA_FULLDUMP;
 116     sigaction (SIGABRT, &sa, (struct sigaction *)0);
 117   }
 118 #endif
 119
 120   /* Make sure that coremaker_local doesn't get optimized away. */
 121   for (i = 0; i < 5; i++)
 122     coremaker_local[i] = i;
 123   coremaker_bss = 0;
 124   for (i = 0; i < 5; i++)
 125     coremaker_bss += coremaker_local[i];
 126   coremaker_data = coremaker_ro + 1;
 127   abort ();
 128 }
 129
 130 void
 131 func1 ()
 132 {
 133   func2 ();
 134 }
 135
 136 int
 137 main (int argc, char **argv)
 138 {
 139   if (argc == 2 && strcmp (argv[1], "sleep") == 0)
 140     {
 141       sleep (60);
 142       return 0;
 143     }
 144   mmapdata ();
 145   func1 ();
 146   return 0;
 147 }