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/*
* $Id: dlfcn.c 1135 2008-09-06 21:55:51Z rathann $
* $Name$
*
* Adopted from Apache DSO code.
* Portions copyright Apache Software Foundation
*
* Structures and types used to implement dlopen, dlsym, etc.
* on Windows 95/NT.
*/
#include <windows.h>
#include <string.h>
#include <stdio.h>
#include "dlfcn.h"
#include "os_types.h"
void *dlopen(const char *module_name, int mode)
{
UINT em;
HINSTANCE dsoh;
char path[MAX_PATH], *p;
/* Load the module...
* per PR2555, the LoadLibraryEx function is very picky about slashes.
* Debugging on NT 4 SP 6a reveals First Chance Exception within NTDLL.
* LoadLibrary in the MS PSDK also reveals that it -explicitly- states
* that backslashes must be used.
*
* Transpose '\' for '/' in the filename.
*/
(void)strncpy(path, module_name, MAX_PATH);
p = path;
while (p = strchr(p, '/'))
*p = '\\';
/* First assume the dso/dll's required by -this- dso are sitting in the
* same path or can be found in the usual places. Failing that, let's
* let that dso look in the apache root.
*/
em = SetErrorMode(SEM_FAILCRITICALERRORS);
dsoh = LoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
if (!dsoh)
{
SetLastError(0); // clear the last error
dsoh = LoadLibraryEx(path, NULL, 0);
}
SetErrorMode(em);
SetLastError(0); // clear the last error
return (void *)dsoh;
}
char *dlerror(void)
{
int len, nErrorCode;
static char errstr[120];
/* This is -not- threadsafe code, but it's about the best we can do.
* mostly a potential problem for isapi modules, since LoadModule
* errors are handled within a single config thread.
*/
if((nErrorCode = GetLastError()) == 0)
return((char *)0);
SetLastError(0); // clear the last error
len = snprintf(errstr, sizeof(errstr), "(%d) ", nErrorCode);
len += FormatMessage(
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
nErrorCode,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */
(LPTSTR) errstr + len,
sizeof(errstr) - len,
NULL
);
/* FormatMessage may have appended a newline (\r\n). So remove it
* and use ": " instead like the Unix errors. The error may also
* end with a . before the return - if so, trash it.
*/
if (len > 1 && errstr[len-2] == '\r' && errstr[len-1] == '\n') {
if (len > 2 && errstr[len-3] == '.')
len--;
errstr[len-2] = ':';
errstr[len-1] = ' ';
}
return errstr;
}
int dlclose(void *handle)
{
return FreeLibrary(handle);
}
void *dlsym(void *handle, const char *name)
{
return GetProcAddress(handle, name);
}
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