src/backend/port/dynloader/linux.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * linux.h
   4  *              Port-specific prototypes for Linux
   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 "utils/dynamic_loader.h"
  18 #ifdef HAVE_DLOPEN
  19 #include <dlfcn.h>
  20 #endif
  21
  22
  23 #ifdef HAVE_DLOPEN
  24
  25 /*
  26  * In some older systems, the RTLD_NOW flag isn't defined and the mode
  27  * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
  28  * if available, but it doesn't exist everywhere.
  29  * If it doesn't exist, set it to 0 so it has no effect.
  30  */
  31 #ifndef RTLD_NOW
  32 #define RTLD_NOW 1
  33 #endif
  34 #ifndef RTLD_GLOBAL
  35 #define RTLD_GLOBAL 0
  36 #endif
  37
  38 #define pg_dlopen(f)    dlopen((f), RTLD_NOW | RTLD_GLOBAL)
  39 #define pg_dlsym                dlsym
  40 #define pg_dlclose              dlclose
  41 #define pg_dlerror              dlerror
  42 #endif   /* HAVE_DLOPEN */
  43
  44 #endif   /* PORT_PROTOS_H */