ACE/apps/JAWS/clients/WebSTONE/src/nsapi-includes/base/dll.h

   1 /*
   2  * Copyright (c) 1994, 1995.  Netscape Communications Corporation.  All
   3  * rights reserved.
   4  *
   5  * Use of this software is governed by the terms of the license agreement for
   6  * the Netscape Communications or Netscape Comemrce Server between the
   7  * parties.
   8  */
   9
  10
  11 /* ------------------------------------------------------------------------ */
  12
  13
  14 /*
  15  * dll.h: Handle dynamically linked libraries
  16  *
  17  * Rob McCool
  18  */
  19
  20 #ifndef _DLL_H
  21 #define _DLL_H
  22
  23 #include "systems.h"
  24
  25 #if defined(DLL_CAPABLE)
  26
  27 /* --------------------------- Data structures ---------------------------- */
  28
  29
  30 #if defined(USE_NSPR)
  31 #include <nspr/prlink.h>
  32 typedef int DLHANDLE;
  33
  34 #elif defined(DLL_DLOPEN)
  35 #include <dlfcn.h>
  36 typedef void *DLHANDLE;  /* DLOPEN */
  37
  38 #elif defined(DLL_HPSHL)
  39 #include <dl.h>
  40 typedef shl_t DLHANDLE;  /* HP_SHL */
  41
  42 #elif defined(DLL_WIN32)
  43 typedef HINSTANCE DLHANDLE; /* WIN32 */
  44 #endif
  45
  46
  47 /* ------------------------------ Prototypes ------------------------------ */
  48
  49
  50 /*
  51  * dll_open loads the library at the given path into memory, and returns
  52  * a handle to be used in later calls to dll_findsym and dll_close.
  53  */
  54 #if defined(USE_NSPR)
  55 #define dll_open(libfn) PR_LoadLibrary(libfn)
  56
  57 #elif defined(DLL_DLOPEN)
  58 #define dll_open(libfn) dlopen(libfn, DLL_DLOPEN_FLAGS)
  59
  60 #elif defined(DLL_HPSHL)
  61 #define dll_open(libfn) shl_load((libfn), BIND_IMMEDIATE, 0)
  62
  63 #elif defined(DLL_WIN32)
  64 DLHANDLE dll_open(char *libfn);
  65 #endif
  66
  67
  68 /*
  69  * dll_findsym looks for a symbol with the given name in the library
  70  * pointed to by the given handle. Returns a pointer to the named function.
  71  */
  72
  73 #if defined(USE_NSPR)
  74 #define dll_findsym(dlp, name) PR_FindSymbol(name)
  75
  76 #elif defined(DLL_DLOPEN)
  77 #define dll_findsym(dlp, name) dlsym(dlp, name)
  78
  79 #elif defined(DLL_HPSHL)
  80 void *dll_findsym(DLHANDLE dlp, char *name);
  81
  82 #elif defined(DLL_WIN32)
  83 #define dll_findsym(dlp, name) GetProcAddress(dlp, name)
  84 #endif
  85
  86
  87 /*
  88  * dll_error returns a string describing the last error on the given handle
  89  */
  90 #if defined(USE_NSPR)
  91 #define dll_error(dlp) system_errmsg(0)
  92
  93 #elif defined(DLL_DLOPEN)
  94 #define dll_error(dlp) dlerror()
  95
  96 #elif defined(DLL_HPSHL)
  97 #define dll_error(dlp) system_errmsg(0)
  98
  99 #elif defined(DLL_WIN32)
 100 #define dll_error(dlp) system_errmsg(0)
 101 #endif
 102
 103
 104 /*
 105  * dll_close closes the previously opened library given by handle
 106  */
 107 #if defined(USE_NSPR)
 108 int dll_close(void *arg);
 109
 110 #elif defined(DLL_DLOPEN)
 111 #define dll_close dlclose
 112
 113 #elif defined (DLL_HPSHL)
 114 #define dll_close shl_unload
 115
 116 #elif defined(DLL_WIN32)
 117 #define dll_close FreeLibrary
 118 #endif
 119
 120
 121 #endif /* DLL_CAPABLE */
 122 #endif