gdb/testsuite/gdb.base/coremaker.c

   1 /* Simple little program that just generates a core dump from inside some
   2    nested function calls. */
   3
   4 #include <stdio.h>
   5 #include <sys/types.h>
   6 #include <fcntl.h>
   7 #include <sys/mman.h>
   8 #include <signal.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11
  12 #ifndef __STDC__
  13 #define const   /**/
  14 #endif
  15
  16 #define MAPSIZE (8 * 1024)
  17
  18 /* Don't make these automatic vars or we will have to walk back up the
  19    stack to access them. */
  20
  21 char *buf1;
  22 char *buf2;
  23
  24 int coremaker_data = 1; /* In Data section */
  25 int coremaker_bss;      /* In BSS section */
  26
  27 const int coremaker_ro = 201;   /* In Read-Only Data section */
  28
  29 /* Note that if the mapping fails for any reason, we set buf2
  30    to -1 and the testsuite notices this and reports it as
  31    a failure due to a mapping error.  This way we don't have
  32    to test for specific errors when running the core maker. */
  33
  34 void
  35 mmapdata ()
  36 {
  37   int j, fd;
  38
  39   /* Allocate and initialize a buffer that will be used to write
  40      the file that is later mapped in. */
  41
  42   buf1 = (char *) malloc (MAPSIZE);
  43   for (j = 0; j < MAPSIZE; ++j)
  44     {
  45       buf1[j] = j;
  46     }
  47
  48   /* Write the file to map in */
  49
  50   fd = open ("coremmap.data", O_CREAT | O_RDWR, 0666);
  51   if (fd == -1)
  52     {
  53       perror ("coremmap.data open failed");
  54       buf2 = (char *) -1;
  55       return;
  56     }
  57   write (fd, buf1, MAPSIZE);
  58
  59   /* Now map the file into our address space as buf2 */
  60
  61   buf2 = (char *) mmap (0, MAPSIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
  62   if (buf2 == (char *) -1)
  63     {
  64       perror ("mmap failed");
  65       return;
  66     }
  67
  68   /* Verify that the original data and the mapped data are identical.
  69      If not, we'd rather fail now than when trying to access the mapped
  70      data from the core file. */
  71
  72   for (j = 0; j < MAPSIZE; ++j)
  73     {
  74       if (buf1[j] != buf2[j])
  75         {
  76           fprintf (stderr, "mapped data is incorrect");
  77           buf2 = (char *) -1;
  78           return;
  79         }
  80     }
  81 }
  82
  83 void
  84 func2 ()
  85 {
  86   int coremaker_local[5];
  87   int i;
  88
  89 #ifdef SA_FULLDUMP
  90   /* Force a corefile that includes the data section for AIX.  */
  91   {
  92     struct sigaction sa;
  93
  94     sigaction (SIGABRT, (struct sigaction *)0, &sa);
  95     sa.sa_flags |= SA_FULLDUMP;
  96     sigaction (SIGABRT, &sa, (struct sigaction *)0);
  97   }
  98 #endif
  99
 100   /* Make sure that coremaker_local doesn't get optimized away. */
 101   for (i = 0; i < 5; i++)
 102     coremaker_local[i] = i;
 103   coremaker_bss = 0;
 104   for (i = 0; i < 5; i++)
 105     coremaker_bss += coremaker_local[i];
 106   coremaker_data = coremaker_ro + 1;
 107   abort ();
 108 }
 109
 110 void
 111 func1 ()
 112 {
 113   func2 ();
 114 }
 115
 116 int main ()
 117 {
 118   mmapdata ();
 119   func1 ();
 120   return 0;
 121 }
 122