dllplug.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1997-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*/
#include <ast.h>
#include <dlldefs.h>
#include <error.h>
/*
* find and load lib plugin/module library name with optional version ver and dlopen() flags
* at least one dlopen() is called to initialize dlerror()
* if path!=0 then library path up to size chars copied to path with trailing 0
* if name contains a directory prefix then library search is limited to the dir and siblings
*/
extern void*
dllplug(const char* lib, const char* name, const char* ver, int flags, char* path, size_t size)
{
void* dll;
int hit;
Dllscan_t* dls;
Dllent_t* dle;
hit = 0;
for (;;)
{
if (dls = dllsopen(lib, name, ver))
{
while (dle = dllsread(dls))
{
hit = 1;
if (dll = dllopen(dle->path, flags|RTLD_GLOBAL|RTLD_PARENT))
{
if (path && size)
strncopy(path, dle->path, size);
break;
}
else
errorf("dll", NiL, 1, "%s: dlopen failed: %s", dle->path, dlerror());
}
dllsclose(dls);
}
if (hit)
return dll;
if (!lib)
break;
lib = 0;
}
if ((dll = dllopen(name, flags)) && dll && path && size)
strncopy(path, name, size);
return dll;
}