testglue.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #ifndef NO_UNISTD_H
   4 #include <sys/unistd.h>
   5 #endif
   6
   7 /* A simple glue file for embedded targets so we can get the real exit
   8    status from the program. This assumes we're using GNU ld and can use
   9    the -wrap option, and that write(1, ...) does something useful. */
  10
  11 /* There is a bunch of weird cruft with #ifdef UNDERSCORES. This is needed
  12    because currently GNU ld doesn't deal well with a.out targets and
  13    the -wrap option. When GNU ld is fixed, this should definitely be
  14    removed. Note that we actually wrap __exit, not _exit on a target
  15    that has UNDERSCORES defined.  On non-UNDERSCORE targets, we
  16    wrap _exit separately; it's actually a different function.  */
  17
  18 #ifdef WRAP_M68K_AOUT
  19 #define REAL_EXIT(code) asm ( "trap %0" : : "i" (0) );
  20 #define REAL_ABORT() REAL_EXIT(6)
  21 #define ORIG_EXIT _exit
  22 #define ORIG_ABORT abort
  23 #else
  24 #ifdef UNDERSCORES
  25 #define REAL_EXIT _real___exit
  26 #define REAL_MAIN _real__main
  27 #define REAL_ABORT _real__abort
  28 #define ORIG_EXIT _wrap___exit
  29 #define ORIG_ABORT _wrap__abort
  30 #define ORIG_MAIN _wrap__main
  31 #else
  32 #define REAL_EXIT __real_exit
  33 #ifndef VXWORKS
  34 #define REAL__EXIT __real__exit
  35 #endif
  36 #define REAL_MAIN __real_main
  37 #define REAL_ABORT __real_abort
  38 #define ORIG_EXIT __wrap_exit
  39 #define ORIG__EXIT __wrap__exit
  40 #define ORIG_ABORT __wrap_abort
  41 #define ORIG_MAIN __wrap_main
  42
  43 #endif
  44
  45 extern void abort (void);
  46 extern void exit (int);
  47
  48 #endif
  49
  50 #ifdef REAL_MAIN
  51 extern void REAL_EXIT ();
  52 extern void REAL_ABORT ();
  53 extern int REAL_MAIN (int argc, char **argv, char **envp);
  54 #endif
  55 #ifdef REAL__EXIT
  56 extern void REAL__EXIT ();
  57 #endif
  58
  59 static int done_exit_message = 0;
  60 int ___constval = 1;
  61
  62 #ifdef VXWORKS
  63 static void __runexit();
  64 #endif
  65
  66 static char *
  67 write_int(val, ptr)
  68      int val;
  69      char *ptr;
  70 {
  71   char c;
  72   if (val<0) {
  73     *(ptr++) = '-';
  74     val = -val;
  75   }
  76   if (val>9) {
  77     ptr = write_int (val/10, ptr);
  78   }
  79   c = (val%10)+'0';
  80   *(ptr++) = c;
  81   return ptr;
  82 }
  83
  84 void
  85 ORIG_EXIT (code)
  86      int code;
  87 {
  88   char buf[30];
  89   char *ptr;
  90
  91 #ifdef VXWORKS
  92   __runexit ();
  93 #endif
  94   strcpy (buf, "\n*** EXIT code ");
  95   ptr = write_int (code, buf + strlen(buf));
  96   *(ptr++) = '\n';
  97   write (1, buf, ptr-buf);
  98   done_exit_message = 1;
  99   REAL_EXIT (code);
 100   while (___constval);
 101 }
 102
 103 #ifdef ORIG__EXIT
 104 void
 105 ORIG__EXIT (code)
 106      int code;
 107 {
 108   char buf[30];
 109   char *ptr;
 110
 111   /* Since exit may call _exit, we need to avoid a second message.  */
 112   if (! done_exit_message)
 113     {
 114       strcpy (buf, "\n*** EXIT code ");
 115       ptr = write_int (code, buf + strlen(buf));
 116       *(ptr++) = '\n';
 117       write (1, buf, ptr-buf);
 118     }
 119
 120   REAL__EXIT (code);
 121   while (___constval);
 122 }
 123 #endif
 124
 125 void
 126 ORIG_ABORT ()
 127 {
 128   write (1, "\n*** EXIT code 4242\n", 20);
 129   REAL_ABORT ();
 130   while (___constval);
 131   abort ();
 132 }
 133
 134 #ifdef REAL_MAIN
 135 int
 136 ORIG_MAIN (argc, argv, envp)
 137      int argc;
 138      char **argv;
 139      char **envp;
 140 {
 141 #ifdef WRAP_FILE_ARGS
 142   extern int __argc;
 143   extern char *__args[];
 144
 145   exit (REAL_MAIN (__argc,__args,envp));
 146 #else
 147   exit (REAL_MAIN (argc, argv, envp));
 148 #endif
 149   while (___constval);
 150 }
 151 #endif
 152
 153 #ifdef VXWORKS
 154 void
 155 _exit (status)
 156      int status;
 157 {
 158   REAL_EXIT (status);
 159 }
 160
 161 typedef (*PFV)(void);
 162
 163 static PFV __list[32];
 164 static int __listcnt = 0;
 165 static int __running = 0;
 166
 167 int
 168 atexit (PFV func)
 169 {
 170   __list[__listcnt++] = func;
 171 }
 172
 173 static void
 174 __runexit ()
 175 {
 176   int i;
 177   if (__running++)
 178     return;
 179
 180   for (i = 0; i < __listcnt; i++)
 181     __list[i]();
 182   __running = 0;
 183 }
 184 #endif