cadpli/ivl_dlfcn.h

   1 #ifndef __ivl_dlfcn_H
   2 #define __ivl_dlfcn_H
   3 /*
   4  * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
   5  *
   6  *    This source code is free software; you can redistribute it
   7  *    and/or modify it in source code form under the terms of the GNU
   8  *    General Public License as published by the Free Software
   9  *    Foundation; either version 2 of the License, or (at your option)
  10  *    any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  20  */
  21 #ifdef HAVE_CVS_IDENT
  22 #ident "$Id: ivl_dlfcn.h,v 1.3 2004/10/04 01:10:56 steve Exp $"
  23 #endif
  24
  25 #if defined(__MINGW32__)
  26 # include <windows.h>
  27 # include <stdio.h>
  28 typedef void * ivl_dll_t;
  29 #elif defined(HAVE_DLFCN_H)
  30 # include  <dlfcn.h>
  31 typedef void* ivl_dll_t;
  32 #elif defined(HAVE_DL_H)
  33 # include  <dl.h>
  34 typedef shl_t ivl_dll_t;
  35 #endif
  36
  37 #if defined(__MINGW32__)
  38 static inline ivl_dll_t ivl_dlopen(const char *name)
  39 { return (void *)LoadLibrary(name); }
  40
  41 static inline void *ivl_dlsym(ivl_dll_t dll, const char *nm)
  42 { return (void *)GetProcAddress((HINSTANCE)dll,nm);}
  43
  44 static inline void ivl_dlclose(ivl_dll_t dll)
  45 { (void)FreeLibrary((HINSTANCE)dll);}
  46
  47 static inline const char *dlerror(void)
  48 {
  49   static char msg[256];
  50   unsigned long err = GetLastError();
  51   FormatMessage(
  52                 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
  53                 NULL,
  54                 err,
  55                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
  56                 (LPTSTR) &msg,
  57                 sizeof(msg) - 1,
  58                 NULL
  59                 );
  60   return msg;
  61 }
  62
  63 #elif defined(HAVE_DLFCN_H)
  64 static inline ivl_dll_t ivl_dlopen(const char*name)
  65 { return dlopen(name,RTLD_LAZY); }
  66
  67 static inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
  68 {
  69       void*sym = dlsym(dll, nm);
  70         /* Not found? try without the leading _ */
  71       if (sym == 0 && nm[0] == '_')
  72             sym = dlsym(dll, nm+1);
  73       return sym;
  74 }
  75
  76 static inline void ivl_dlclose(ivl_dll_t dll)
  77 { dlclose(dll); }
  78
  79 #elif defined(HAVE_DL_H)
  80 static inline ivl_dll_t ivl_dlopen(const char*name)
  81 { return shl_load(name, BIND_IMMEDIATE, 0); }
  82
  83 static inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
  84 {
  85       void*sym;
  86       int rc = shl_findsym(&dll, nm, TYPE_PROCEDURE, &sym);
  87       return (rc == 0) ? sym : 0;
  88 }
  89
  90 static inline void ivl_dlclose(ivl_dll_t dll)
  91 { shl_unload(dll); }
  92
  93 static inline const char*dlerror(void)
  94 { return strerror( errno ); }
  95 #endif
  96
  97 /*
  98  * $Log: ivl_dlfcn.h,v $
  99  * Revision 1.3  2004/10/04 01:10:56  steve
 100  *  Clean up spurious trailing white space.
 101  *
 102  * Revision 1.2  2003/12/12 05:43:08  steve
 103  *  Some systems dlsym requires leading _ or not on whim.
 104  *
 105  * Revision 1.1  2003/02/17 00:01:25  steve
 106  *  Use a variant of ivl_dlfcn to do dynamic loading
 107  *  from within the cadpli module.
 108  *
 109  *  Change the +cadpli flag to -cadpli, to keep the
 110  *  plusargs namespace clear.
 111  *
 112  */
 113 #endif