usr/src/lib/libdll/common/dllplug.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1997-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                                                                      *
  19 ***********************************************************************/
  20 #pragma prototyped
  21 /*
  22  * Glenn Fowler
  23  * AT&T Research
  24  */
  25
  26 #include <ast.h>
  27 #include <dlldefs.h>
  28 #include <error.h>
  29
  30 /*
  31  * find and load lib plugin/module library name with optional version ver and dlopen() flags
  32  * at least one dlopen() is called to initialize dlerror()
  33  * if path!=0 then library path up to size chars copied to path with trailing 0
  34  * if name contains a directory prefix then library search is limited to the dir and siblings
  35  */
  36
  37 extern void*
  38 dllplug(const char* lib, const char* name, const char* ver, int flags, char* path, size_t size)
  39 {
  40         void*           dll;
  41         int             hit;
  42         Dllscan_t*      dls;
  43         Dllent_t*       dle;
  44
  45         hit = 0;
  46         for (;;)
  47         {
  48                 if (dls = dllsopen(lib, name, ver))
  49                 {
  50                         while (dle = dllsread(dls))
  51                         {
  52                                 hit = 1;
  53                                 if (dll = dllopen(dle->path, flags|RTLD_GLOBAL|RTLD_PARENT))
  54                                 {
  55                                         if (path && size)
  56                                                 strncopy(path, dle->path, size);
  57                                         break;
  58                                 }
  59                                 else
  60                                         errorf("dll", NiL, 1, "%s: dlopen failed: %s", dle->path, dlerror());
  61                         }
  62                         dllsclose(dls);
  63                 }
  64                 if (hit)
  65                         return dll;
  66                 if (!lib)
  67                         break;
  68                 lib = 0;
  69         }
  70         if ((dll = dllopen(name, flags)) && dll && path && size)
  71                 strncopy(path, name, size);
  72         return dll;
  73 }