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*
dllplug(const char * lib,const char * name,const char * ver,int flags,char * path,size_t size)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 }
74