src/backend/port/dynloader/freebsd.h

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