dist/nvi/common/dldb.c

   1 /*      $NetBSD$ */
   2
   3 #include "config.h"
   4
   5 #include <dlfcn.h>
   6
   7 #include "common.h"
   8 #include "pathnames.h"
   9
  10 static void relocate __P(());
  11
  12 #define RELOC(func,returntype,args,proto,types) \
  13     static returntype reloc_##func __P(proto); \
  14     returntype (*nvi_##func) __P(proto) = reloc_##func; \
  15     static returntype reloc_##func args \
  16             types \
  17     { \
  18             relocate(); \
  19             return nvi_##func args; \
  20     }
  21
  22 RELOC(db_create,int,(a,b,c),(DB **, DB_ENV *, u_int32_t),
  23     DB**a;DB_ENV*b;u_int32_t c;)
  24 RELOC(db_env_create,int,(a,b),(DB_ENV **, u_int32_t),DB_ENV ** a;u_int32_t b;);
  25 RELOC(db_strerror,char *,(a),(int),int a;)
  26
  27 #define LOADSYM(func) \
  28     if ((nvi_##func = dlsym(handle, #func)) == NULL) \
  29             goto error;
  30
  31 static void
  32 relocate()
  33 {
  34         void *handle = dlopen(_PATH_DB3, RTLD_LAZY);
  35
  36         if (!handle)
  37             goto error;
  38
  39         LOADSYM(db_create)
  40         LOADSYM(db_env_create)
  41         LOADSYM(db_strerror)
  42
  43         return;
  44 error:
  45         fprintf(stderr, "Relocation error: %s\n", dlerror());
  46         abort();
  47 }