src/backend/port/dynloader/netbsd.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * netbsd.h
   4  *        port-specific prototypes for NetBSD
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL$
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PORT_PROTOS_H
  15 #define PORT_PROTOS_H
  16
  17 #include <sys/types.h>
  18 #include <nlist.h>
  19 #include <link.h>
  20 #include <dlfcn.h>
  21
  22 #include "utils/dynamic_loader.h"
  23
  24 /*
  25  * Dynamic Loader on NetBSD 1.0.
  26  *
  27  * this dynamic loader uses the system dynamic loading interface for shared
  28  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  29  * library as the file to be dynamically loaded.
  30  *
  31  * agc - I know this is all a bit crufty, but it does work, is fairly
  32  * portable, and works (the stipulation that the d.l. function must
  33  * begin with an underscore is fairly tricky, and some versions of
  34  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
  35  */
  36
  37 /*
  38  * In some older systems, the RTLD_NOW flag isn't defined and the mode
  39  * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
  40  * if available, but it doesn't exist everywhere.
  41  * If it doesn't exist, set it to 0 so it has no effect.
  42  */
  43 #ifndef RTLD_NOW
  44 #define RTLD_NOW 1
  45 #endif
  46 #ifndef RTLD_GLOBAL
  47 #define RTLD_GLOBAL 0
  48 #endif
  49
  50 #define            pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
  51 #define            pg_dlsym                BSD44_derived_dlsym
  52 #define            pg_dlclose      BSD44_derived_dlclose
  53 #define            pg_dlerror      BSD44_derived_dlerror
  54
  55 char       *BSD44_derived_dlerror(void);
  56 void       *BSD44_derived_dlopen(const char *filename, int num);
  57 void       *BSD44_derived_dlsym(void *handle, const char *name);
  58 void            BSD44_derived_dlclose(void *handle);
  59
  60 #endif   /* PORT_PROTOS_H */