Adding upstream version 1.7.2.upstream/1.7.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 1608 insertions, 0 deletions

diff --git a/dso/aix/dso.c b/dso/aix/dso.c
new file mode 100644
index 0000000..25f6262
--- /dev/null
+++ b/dso/aix/dso.c
@@ -0,0 +1,714 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ *  dso.c -- DSO system function emulation for AIX
+ *
+ *  This is *only* intended for AIX < 4.3.
+ */
+
+/*
+ *  Based on libdl (dlfcn.c/dlfcn.h) which is
+ *  Copyright (c) 1992,1993,1995,1996,1997,1988
+ *  Jens-Uwe Mager, Helios Software GmbH, Hannover, Germany.
+ *
+ *  Not derived from licensed software.
+ *
+ *  Permission is granted to freely use, copy, modify, and redistribute
+ *  this software, provided that the author is not construed to be liable
+ *  for any results of using the software, alterations are clearly marked
+ *  as such, and this notice is not modified.
+ *
+ *  Changes marked with `--jwe' were made on April 7 1996 by
+ *  John W. Eaton <jwe@bevo.che.wisc.edu> to support g++ 
+ *
+ *  Bundled, stripped and adjusted on April 1998 as one single source file 
+ *  for inclusion into the Apache HTTP server by 
+ *  Ralf S. Engelschall <rse@apache.org>
+ *
+ *  Added to APR by David Reid April 2000
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/ldr.h>
+#include <a.out.h>
+#include "apr_arch_dso.h"
+#include "apr_portable.h"
+
+#if APR_HAS_DSO
+
+#undef FREAD
+#undef FWRITE
+#include <ldfcn.h>
+
+/*
+ * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
+ * these here to compensate for that lossage.
+ */
+#ifndef BEGINNING
+#define BEGINNING SEEK_SET
+#endif
+#ifndef FSEEK
+#define FSEEK(ldptr,o,p)   fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
+#endif
+#ifndef FREAD
+#define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
+#endif
+
+/*
+ * Mode flags for the dlopen routine.
+ */
+#undef  RTLD_LAZY
+#define RTLD_LAZY	1	/* lazy function call binding */
+#undef  RTLD_NOW
+#define RTLD_NOW	2	/* immediate function call binding */
+#undef  RTLD_GLOBAL
+#define RTLD_GLOBAL	0x100	/* allow symbols to be global */
+
+/*
+ * To be able to initialize, a library may provide a dl_info structure
+ * that contains functions to be called to initialize and terminate.
+ */
+struct dl_info {
+    void (*init) (void);
+    void (*fini) (void);
+};
+
+/* APR functions...
+ *
+ * As the AIX functions have been declared in the header file we just
+ * add the basic "wrappers" here.
+ */
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->pool = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+
+    if (dso->handle != NULL && dlclose(dso->handle) != 0)
+        return APR_EINIT;
+    dso->handle = NULL;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *ctx)
+{
+    void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);
+
+    *res_handle = apr_pcalloc(ctx, sizeof(*res_handle));
+
+    if(os_handle == NULL) {
+        (*res_handle)->errormsg = dlerror();       
+        return APR_EDSOOPEN;
+    }
+
+    (*res_handle)->handle = (void*)os_handle;
+    (*res_handle)->pool = ctx;
+    (*res_handle)->errormsg = NULL;
+
+    apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                                      apr_dso_handle_t *handle, 
+                                      const char *symname)
+{
+    void *retval = dlsym(handle->handle, symname);
+
+    if (retval == NULL) {
+        handle->errormsg = dlerror();
+        return APR_ESYMNOTFOUND;
+    }
+
+    *ressym = retval;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
+{
+    if (dso->errormsg) {
+        apr_cpystrn(buffer, dso->errormsg, buflen);
+        return dso->errormsg;
+    }
+    return "No Error";
+}
+
+
+
+/*
+ * We simulate dlopen() et al. through a call to load. Because AIX has
+ * no call to find an exported symbol we read the loader section of the
+ * loaded module and build a list of exported symbols and their virtual
+ * address.
+ */
+
+typedef struct {
+    char *name;			/* the symbols's name */
+    void *addr;			/* its relocated virtual address */
+} Export, *ExportPtr;
+
+/*
+ * xlC uses the following structure to list its constructors and
+ * destructors. This is gleaned from the output of munch.
+ */
+typedef struct {
+    void (*init) (void);	/* call static constructors */
+    void (*term) (void);	/* call static destructors */
+} Cdtor, *CdtorPtr;
+
+typedef void (*GccCDtorPtr) (void);
+
+/*
+ * The void * handle returned from dlopen is actually a ModulePtr.
+ */
+typedef struct Module {
+    struct Module *next;
+    char *name;			/* module name for refcounting */
+    int refCnt;			/* the number of references */
+    void *entry;		/* entry point from load */
+    struct dl_info *info;	/* optional init/terminate functions */
+    CdtorPtr cdtors;		/* optional C++ constructors */
+    GccCDtorPtr gcc_ctor;	/* g++ constructors  --jwe */
+    GccCDtorPtr gcc_dtor;	/* g++ destructors  --jwe */
+    int nExports;		/* the number of exports found */
+    ExportPtr exports;		/* the array of exports */
+} Module, *ModulePtr;
+
+/*
+ * We keep a list of all loaded modules to be able to call the fini
+ * handlers and destructors at atexit() time.
+ */
+static ModulePtr modList;
+
+/*
+ * The last error from one of the dl* routines is kept in static
+ * variables here. Each error is returned only once to the caller.
+ */
+static char errbuf[BUFSIZ];
+static int errvalid;
+
+/*
+ * The `fixed' gcc header files on AIX 3.2.5 provide a prototype for
+ * strdup().  --jwe
+ */
+extern char *strdup(const char *);
+static void caterr(char *);
+static int readExports(ModulePtr);
+static void terminate(void);
+static void *findMain(void);
+
+void *dlopen(const char *path, int mode)
+{
+    register ModulePtr mp;
+    static void *mainModule;
+
+    /*
+     * Upon the first call register a terminate handler that will
+     * close all libraries. Also get a reference to the main module
+     * for use with loadbind.
+     */
+    if (!mainModule) {
+	if ((mainModule = findMain()) == NULL)
+	    return NULL;
+	atexit(terminate);
+    }
+    /*
+     * Scan the list of modules if we have the module already loaded.
+     */
+    for (mp = modList; mp; mp = mp->next)
+	if (strcmp(mp->name, path) == 0) {
+	    mp->refCnt++;
+	    return mp;
+	}
+    if ((mp = (ModulePtr) calloc(1, sizeof(*mp))) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "calloc: ");
+	strcat(errbuf, strerror(errno));
+	return NULL;
+    }
+    if ((mp->name = strdup(path)) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "strdup: ");
+	strcat(errbuf, strerror(errno));
+	free(mp);
+	return NULL;
+    }
+    /*
+     * load should be declared load(const char *...). Thus we
+     * cast the path to a normal char *. Ugly.
+     */
+    if ((mp->entry = (void *) loadAndInit((char *) path, L_NOAUTODEFER, NULL)) == NULL) {
+	free(mp->name);
+	free(mp);
+	errvalid++;
+	strcpy(errbuf, "dlopen: ");
+	strcat(errbuf, path);
+	strcat(errbuf, ": ");
+	/*
+	 * If AIX says the file is not executable, the error
+	 * can be further described by querying the loader about
+	 * the last error.
+	 */
+	if (errno == ENOEXEC) {
+	    char *tmp[BUFSIZ / sizeof(char *)];
+	    if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
+		strcpy(errbuf, strerror(errno));
+	    else {
+		char **p;
+		for (p = tmp; *p; p++)
+		    caterr(*p);
+	    }
+	}
+	else
+	    strcat(errbuf, strerror(errno));
+	return NULL;
+    }
+    mp->refCnt = 1;
+    mp->next = modList;
+    modList = mp;
+    if (loadbind(0, mainModule, mp->entry) == -1) {
+	dlclose(mp);
+	errvalid++;
+	strcpy(errbuf, "loadbind: ");
+	strcat(errbuf, strerror(errno));
+	return NULL;
+    }
+    /*
+     * If the user wants global binding, loadbind against all other
+     * loaded modules.
+     */
+    if (mode & RTLD_GLOBAL) {
+	register ModulePtr mp1;
+	for (mp1 = mp->next; mp1; mp1 = mp1->next)
+	    if (loadbind(0, mp1->entry, mp->entry) == -1) {
+		dlclose(mp);
+		errvalid++;
+		strcpy(errbuf, "loadbind: ");
+		strcat(errbuf, strerror(errno));
+		return NULL;
+	    }
+    }
+    if (readExports(mp) == -1) {
+	dlclose(mp);
+	return NULL;
+    }
+    /*
+     * If there is a dl_info structure, call the init function.
+     */
+    if (mp->info = (struct dl_info *) dlsym(mp, "dl_info")) {
+	if (mp->info->init)
+	    (*mp->info->init) ();
+    }
+    else
+	errvalid = 0;
+    /*
+     * If the shared object was compiled using xlC we will need
+     * to call static constructors (and later on dlclose destructors).
+     */
+    if (mp->cdtors = (CdtorPtr) dlsym(mp, "__cdtors")) {
+	CdtorPtr cp = mp->cdtors;
+	while (cp->init || cp->term) {
+	    if (cp->init && cp->init != (void (*)(void)) 0xffffffff)
+		(*cp->init) ();
+	    cp++;
+	}
+	/*
+	 * If the shared object was compiled using g++, we will need
+	 * to call global constructors using the _GLOBAL__DI function,
+	 * and later, global destructors using the _GLOBAL_DD
+	 * funciton.  --jwe
+	 */
+    }
+    else if (mp->gcc_ctor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DI")) {
+	(*mp->gcc_ctor) ();
+	mp->gcc_dtor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DD");
+    }
+    else
+	errvalid = 0;
+    return mp;
+}
+
+/*
+ * Attempt to decipher an AIX loader error message and append it
+ * to our static error message buffer.
+ */
+static void caterr(char *s)
+{
+    register char *p = s;
+
+    while (*p >= '0' && *p <= '9')
+	p++;
+    switch (atoi(s)) {
+    case L_ERROR_TOOMANY:
+	strcat(errbuf, "to many errors");
+	break;
+    case L_ERROR_NOLIB:
+	strcat(errbuf, "can't load library");
+	strcat(errbuf, p);
+	break;
+    case L_ERROR_UNDEF:
+	strcat(errbuf, "can't find symbol");
+	strcat(errbuf, p);
+	break;
+    case L_ERROR_RLDBAD:
+	strcat(errbuf, "bad RLD");
+	strcat(errbuf, p);
+	break;
+    case L_ERROR_FORMAT:
+	strcat(errbuf, "bad exec format in");
+	strcat(errbuf, p);
+	break;
+    case L_ERROR_ERRNO:
+	strcat(errbuf, strerror(atoi(++p)));
+	break;
+    default:
+	strcat(errbuf, s);
+	break;
+    }
+}
+
+void *dlsym(void *handle, const char *symbol)
+{
+    register ModulePtr mp = (ModulePtr) handle;
+    register ExportPtr ep;
+    register int i;
+
+    /*
+     * Could speed up the search, but I assume that one assigns
+     * the result to function pointers anyways.
+     */
+    for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
+	if (strcmp(ep->name, symbol) == 0)
+	    return ep->addr;
+    errvalid++;
+    strcpy(errbuf, "dlsym: undefined symbol ");
+    strcat(errbuf, symbol);
+    return NULL;
+}
+
+const char *dlerror(void)
+{
+    if (errvalid) {
+	errvalid = 0;
+	return errbuf;
+    }
+    return NULL;
+}
+
+int dlclose(void *handle)
+{
+    register ModulePtr mp = (ModulePtr) handle;
+    int result;
+    register ModulePtr mp1;
+
+    if (--mp->refCnt > 0)
+	return 0;
+    if (mp->info && mp->info->fini)
+	(*mp->info->fini) ();
+    if (mp->cdtors) {
+	CdtorPtr cp = mp->cdtors;
+	while (cp->init || cp->term) {
+	    if (cp->term && cp->init != (void (*)(void)) 0xffffffff)
+		(*cp->term) ();
+	    cp++;
+	}
+	/*
+	 * If the function to handle global destructors for g++
+	 * exists, call it.  --jwe
+	 */
+    }
+    else if (mp->gcc_dtor) {
+	(*mp->gcc_dtor) ();
+    }
+    result = unload(mp->entry);
+    if (result == -1) {
+	errvalid++;
+	strcpy(errbuf, strerror(errno));
+    }
+    if (mp->exports) {
+	register ExportPtr ep;
+	register int i;
+	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
+	    if (ep->name)
+		free(ep->name);
+	free(mp->exports);
+    }
+    if (mp == modList)
+	modList = mp->next;
+    else {
+	for (mp1 = modList; mp1; mp1 = mp1->next)
+	    if (mp1->next == mp) {
+		mp1->next = mp->next;
+		break;
+	    }
+    }
+    free(mp->name);
+    free(mp);
+    return result;
+}
+
+static void terminate(void)
+{
+    while (modList)
+	dlclose(modList);
+}
+
+/*
+ * Build the export table from the XCOFF .loader section.
+ */
+static int readExports(ModulePtr mp)
+{
+    LDFILE *ldp = NULL;
+    SCNHDR sh, shdata;
+    LDHDR *lhp;
+    char *ldbuf;
+    LDSYM *ls;
+    int i;
+    ExportPtr ep;
+    struct ld_info *lp;
+    char *buf;
+    int size = 4 * 1024;
+    void *dataorg;
+
+    /*
+     * The module might be loaded due to the LIBPATH
+     * environment variable. Search for the loaded
+     * module using L_GETINFO.
+     */
+    if ((buf = malloc(size)) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "readExports: ");
+	strcat(errbuf, strerror(errno));
+	return -1;
+    }
+    while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
+	free(buf);
+	size += 4 * 1024;
+	if ((buf = malloc(size)) == NULL) {
+	    errvalid++;
+	    strcpy(errbuf, "readExports: ");
+	    strcat(errbuf, strerror(errno));
+	    return -1;
+	}
+    }
+    if (i == -1) {
+	errvalid++;
+	strcpy(errbuf, "readExports: ");
+	strcat(errbuf, strerror(errno));
+	free(buf);
+	return -1;
+    }
+    /*
+     * Traverse the list of loaded modules. The entry point
+     * returned by load() does actually point to the TOC
+     * entry contained in the data segment.
+     */
+    lp = (struct ld_info *) buf;
+    while (lp) {
+	if ((unsigned long) mp->entry >= (unsigned long) lp->ldinfo_dataorg &&
+	    (unsigned long) mp->entry < (unsigned long) lp->ldinfo_dataorg +
+	    lp->ldinfo_datasize) {
+	    dataorg = lp->ldinfo_dataorg;
+	    ldp = ldopen(lp->ldinfo_filename, ldp);
+	    break;
+	}
+	if (lp->ldinfo_next == 0)
+	    lp = NULL;
+	else
+	    lp = (struct ld_info *) ((char *) lp + lp->ldinfo_next);
+    }
+    free(buf);
+    if (!ldp) {
+	errvalid++;
+	strcpy(errbuf, "readExports: ");
+	strcat(errbuf, strerror(errno));
+	return -1;
+    }
+    if (TYPE(ldp) != U802TOCMAGIC) {
+	errvalid++;
+	strcpy(errbuf, "readExports: bad magic");
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    /*
+     * Get the padding for the data section. This is needed for
+     * AIX 4.1 compilers. This is used when building the final
+     * function pointer to the exported symbol.
+     */
+    if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
+	errvalid++;
+	strcpy(errbuf, "readExports: cannot read data section header");
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
+	errvalid++;
+	strcpy(errbuf, "readExports: cannot read loader section header");
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    /*
+     * We read the complete loader section in one chunk, this makes
+     * finding long symbol names residing in the string table easier.
+     */
+    if ((ldbuf = (char *) malloc(sh.s_size)) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "readExports: ");
+	strcat(errbuf, strerror(errno));
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
+	errvalid++;
+	strcpy(errbuf, "readExports: cannot seek to loader section");
+	free(ldbuf);
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
+	errvalid++;
+	strcpy(errbuf, "readExports: cannot read loader section");
+	free(ldbuf);
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    lhp = (LDHDR *) ldbuf;
+    ls = (LDSYM *) (ldbuf + LDHDRSZ);
+    /*
+     * Count the number of exports to include in our export table.
+     */
+    for (i = lhp->l_nsyms; i; i--, ls++) {
+	if (!LDR_EXPORT(*ls))
+	    continue;
+	mp->nExports++;
+    }
+    if ((mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "readExports: ");
+	strcat(errbuf, strerror(errno));
+	free(ldbuf);
+	while (ldclose(ldp) == FAILURE);
+	return -1;
+    }
+    /*
+     * Fill in the export table. All entries are relative to
+     * the beginning of the data origin.
+     */
+    ep = mp->exports;
+    ls = (LDSYM *) (ldbuf + LDHDRSZ);
+    for (i = lhp->l_nsyms; i; i--, ls++) {
+	char *symname;
+	char tmpsym[SYMNMLEN + 1];
+	if (!LDR_EXPORT(*ls))
+	    continue;
+	if (ls->l_zeroes == 0)
+	    symname = ls->l_offset + lhp->l_stoff + ldbuf;
+	else {
+	    /*
+	     * The l_name member is not zero terminated, we
+	     * must copy the first SYMNMLEN chars and make
+	     * sure we have a zero byte at the end.
+	     */
+	    strncpy(tmpsym, ls->l_name, SYMNMLEN);
+	    tmpsym[SYMNMLEN] = '\0';
+	    symname = tmpsym;
+	}
+	ep->name = strdup(symname);
+	ep->addr = (void *) ((unsigned long) dataorg +
+			     ls->l_value - shdata.s_vaddr);
+	ep++;
+    }
+    free(ldbuf);
+    while (ldclose(ldp) == FAILURE);
+    return 0;
+}
+
+/*
+ * Find the main modules data origin. This is used as export pointer
+ * for loadbind() to be able to resolve references to the main part.
+ */
+static void *findMain(void)
+{
+    struct ld_info *lp;
+    char *buf;
+    int size = 4 * 1024;
+    int i;
+    void *ret;
+
+    if ((buf = malloc(size)) == NULL) {
+	errvalid++;
+	strcpy(errbuf, "findMain: ");
+	strcat(errbuf, strerror(errno));
+	return NULL;
+    }
+    while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
+	free(buf);
+	size += 4 * 1024;
+	if ((buf = malloc(size)) == NULL) {
+	    errvalid++;
+	    strcpy(errbuf, "findMain: ");
+	    strcat(errbuf, strerror(errno));
+	    return NULL;
+	}
+    }
+    if (i == -1) {
+	errvalid++;
+	strcpy(errbuf, "findMain: ");
+	strcat(errbuf, strerror(errno));
+	free(buf);
+	return NULL;
+    }
+    /*
+     * The first entry is the main module. The data segment
+     * starts with the TOC entries for all exports, so the
+     * data segment origin works as argument for loadbind.
+     */
+    lp = (struct ld_info *) buf;
+    ret = lp->ldinfo_dataorg;
+    free(buf);
+    return ret;
+}
+
+#endif
diff --git a/dso/beos/dso.c b/dso/beos/dso.c
new file mode 100644
index 0000000..91dd1b4
--- /dev/null
+++ b/dso/beos/dso.c
@@ -0,0 +1,98 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_dso.h"
+#include "apr_portable.h"
+
+#if APR_HAS_DSO
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+
+    if (dso->handle > 0 && unload_add_on(dso->handle) < B_NO_ERROR)
+        return APR_EINIT;
+    dso->handle = -1;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *pool)
+{
+    image_id newid = -1;
+
+    *res_handle = apr_pcalloc(pool, sizeof(*res_handle));
+
+    if((newid = load_add_on(path)) < B_NO_ERROR) {
+        (*res_handle)->errormsg = strerror(newid);
+        return APR_EDSOOPEN;
+	}
+	
+    (*res_handle)->pool = pool;
+    (*res_handle)->handle = newid;
+
+    apr_pool_cleanup_register(pool, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, apr_dso_handle_t *handle,
+               const char *symname)
+{
+    int err;
+
+    if (symname == NULL)
+        return APR_ESYMNOTFOUND;
+
+    err = get_image_symbol(handle->handle, symname, B_SYMBOL_TYPE_ANY, 
+			 ressym);
+
+    if(err != B_OK)
+        return APR_ESYMNOTFOUND;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
+{
+    strncpy(buffer, strerror(errno), buflen);
+    return buffer;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->pool = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+#endif
diff --git a/dso/netware/dso.c b/dso/netware/dso.c
new file mode 100644
index 0000000..4cd2ad6
--- /dev/null
+++ b/dso/netware/dso.c
@@ -0,0 +1,137 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_dso.h"
+#include "apr_strings.h"
+#include "apr_portable.h"
+
+#include <library.h>
+#include <unistd.h>
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->pool = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+    sym_list *symbol = NULL;
+    void *NLMHandle = getnlmhandle();
+
+    if (dso->handle == NULL)
+        return APR_SUCCESS;
+
+    if (dso->symbols != NULL) {
+        symbol = dso->symbols;
+        while (symbol) {
+            UnImportPublicObject(NLMHandle, symbol->symbol);
+            symbol = symbol->next;
+        }
+    }
+
+    if (dlclose(dso->handle) != 0)
+        return APR_EINIT;
+
+    dso->handle = NULL;
+    dso->symbols = NULL;
+    dso->path = NULL;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *pool)
+{
+
+    void *os_handle = NULL;
+    char *fullpath = NULL;
+    apr_status_t rv;
+
+    if ((rv = apr_filepath_merge(&fullpath, NULL, path, 
+                                 APR_FILEPATH_NATIVE, pool)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    os_handle = dlopen(fullpath, RTLD_NOW | RTLD_LOCAL);
+
+    *res_handle = apr_pcalloc(pool, sizeof(**res_handle));
+
+    if(os_handle == NULL) {
+        (*res_handle)->errormsg = dlerror();
+        return APR_EDSOOPEN;
+    }
+
+    (*res_handle)->handle = (void*)os_handle;
+    (*res_handle)->pool = pool;
+    (*res_handle)->errormsg = NULL;
+    (*res_handle)->symbols = NULL;
+    (*res_handle)->path = apr_pstrdup(pool, fullpath);
+
+    apr_pool_cleanup_register(pool, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+    return APR_SUCCESS;
+}
+    
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                                      apr_dso_handle_t *handle, 
+                                      const char *symname)
+{
+    sym_list *symbol = NULL;
+    void *retval = dlsym(handle->handle, symname);
+
+    if (retval == NULL) {
+        handle->errormsg = dlerror();
+        return APR_ESYMNOTFOUND;
+    }
+
+    symbol = apr_pcalloc(handle->pool, sizeof(sym_list));
+    symbol->next = handle->symbols;
+    handle->symbols = symbol;
+    symbol->symbol = apr_pstrdup(handle->pool, symname);
+
+    *ressym = retval;
+    
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, 
+                                        apr_size_t buflen)
+{
+    if (dso->errormsg) {
+        apr_cpystrn(buffer, dso->errormsg, buflen);
+        return dso->errormsg;
+    }
+    return "No Error";
+}
+
diff --git a/dso/os2/dso.c b/dso/os2/dso.c
new file mode 100644
index 0000000..1a7f7de
--- /dev/null
+++ b/dso/os2/dso.c
@@ -0,0 +1,132 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_dso.h"
+#include "apr_strings.h"
+#include "apr_portable.h"
+#include <stdio.h>
+#include <string.h>
+
+#if APR_HAS_DSO
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+    int rc;
+
+    if (dso->handle == 0)
+        return APR_SUCCESS;
+       
+    rc = DosFreeModule(dso->handle);
+
+    if (rc == 0)
+        dso->handle = 0;
+
+    return APR_FROM_OS_ERROR(rc);
+}
+
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, const char *path, apr_pool_t *ctx)
+{
+    char failed_module[200];
+    HMODULE handle;
+    int rc;
+
+    *res_handle = apr_pcalloc(ctx, sizeof(**res_handle));
+    (*res_handle)->cont = ctx;
+    (*res_handle)->load_error = APR_SUCCESS;
+    (*res_handle)->failed_module = NULL;
+
+    if ((rc = DosLoadModule(failed_module, sizeof(failed_module), path, &handle)) != 0) {
+        (*res_handle)->load_error = APR_FROM_OS_ERROR(rc);
+        (*res_handle)->failed_module = apr_pstrdup(ctx, failed_module);
+        return APR_FROM_OS_ERROR(rc);
+    }
+
+    (*res_handle)->handle  = handle;
+    apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+    return APR_SUCCESS;
+}
+
+
+
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->cont, handle, dso_cleanup);
+}
+
+
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                                      apr_dso_handle_t *handle, 
+                                      const char *symname)
+{
+    PFN func;
+    int rc;
+
+    if (symname == NULL || ressym == NULL)
+        return APR_ESYMNOTFOUND;
+
+    if ((rc = DosQueryProcAddr(handle->handle, 0, symname, &func)) != 0) {
+        handle->load_error = APR_FROM_OS_ERROR(rc);
+        return handle->load_error;
+    }
+
+    *ressym = func;
+    return APR_SUCCESS;
+}
+
+
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
+{
+    char message[200];
+    apr_strerror(dso->load_error, message, sizeof(message));
+
+    if (dso->failed_module != NULL) {
+        strcat(message, " (");
+        strcat(message, dso->failed_module);
+        strcat(message, ")");
+    }
+
+    apr_cpystrn(buffer, message, buflen);
+    return buffer;
+}
+
+
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->cont = pool;
+    (*aprdso)->load_error = APR_SUCCESS;
+    (*aprdso)->failed_module = NULL;
+    return APR_SUCCESS;
+}
+
+
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+#endif
diff --git a/dso/os390/dso.c b/dso/os390/dso.c
new file mode 100644
index 0000000..9344c71
--- /dev/null
+++ b/dso/os390/dso.c
@@ -0,0 +1,109 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_arch_dso.h"
+#include <errno.h>
+#include <string.h>
+
+#if APR_HAS_DSO
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{   
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->pool = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+    int rc;
+
+    if (dso->handle == 0)
+        return APR_SUCCESS;
+       
+    rc = dllfree(dso->handle);
+
+    if (rc == 0) {
+        dso->handle = 0;
+        return APR_SUCCESS;
+    }
+    dso->failing_errno = errno;
+    return errno;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *ctx)
+{
+    dllhandle *handle;
+    int rc;
+
+    *res_handle = apr_pcalloc(ctx, sizeof(**res_handle));
+    (*res_handle)->pool = ctx;
+    if ((handle = dllload(path)) != NULL) {
+        (*res_handle)->handle  = handle;
+        apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+        return APR_SUCCESS;
+    }
+
+    (*res_handle)->failing_errno = errno;
+    return APR_EDSOOPEN;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                                      apr_dso_handle_t *handle, 
+                                      const char *symname)
+{
+    void *func_ptr;
+    void *var_ptr; 
+
+    if ((var_ptr = dllqueryvar(handle->handle, symname)) != NULL) {
+        *ressym = var_ptr;
+        return APR_SUCCESS;
+    }
+    if ((func_ptr = (void *)dllqueryfn(handle->handle, symname)) != NULL) {
+        *ressym = func_ptr;
+        return APR_SUCCESS;
+    }
+    handle->failing_errno = errno;
+    return APR_ESYMNOTFOUND;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *handle, char *buffer, 
+                          apr_size_t buflen)
+{
+    apr_cpystrn(buffer, strerror(handle->failing_errno), buflen);
+    return buffer;
+}
+
+#endif
diff --git a/dso/unix/dso.c b/dso/unix/dso.c
new file mode 100644
index 0000000..fdd56f1
--- /dev/null
+++ b/dso/unix/dso.c
@@ -0,0 +1,251 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_dso.h"
+#include "apr_strings.h"
+#include "apr_portable.h"
+
+#if APR_HAS_DSO
+
+#if !defined(DSO_USE_DLFCN) && !defined(DSO_USE_SHL) && !defined(DSO_USE_DYLD)
+#error No DSO implementation specified.
+#endif
+
+#ifdef HAVE_STDDEF_H
+#include <stddef.h>
+#endif
+#if APR_HAVE_STDLIB_H
+#include <stdlib.h> /* malloc(), free() */
+#endif
+#if APR_HAVE_STRING_H
+#include <string.h> /* for strerror() on HP-UX */
+#endif
+
+#if defined(DSO_USE_DYLD)
+#define DYLD_LIBRARY_HANDLE (void *)-1
+#endif
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->pool = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+
+    if (dso->handle == NULL)
+        return APR_SUCCESS;
+
+#if defined(DSO_USE_SHL)
+    shl_unload((shl_t)dso->handle);
+#elif defined(DSO_USE_DYLD)
+    if (dso->handle != DYLD_LIBRARY_HANDLE) {
+        NSUnLinkModule(dso->handle, FALSE);
+    }
+#elif defined(DSO_USE_DLFCN)
+    if (dlclose(dso->handle) != 0)
+        return APR_EINIT;
+#endif
+    dso->handle = NULL;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *pool)
+{
+#if defined(DSO_USE_SHL)
+    shl_t os_handle = shl_load(path, BIND_IMMEDIATE, 0L);
+
+#elif defined(DSO_USE_DYLD)
+    NSObjectFileImage image;
+    NSModule os_handle = NULL;
+    NSObjectFileImageReturnCode dsoerr;
+    const char* err_msg = NULL;
+    dsoerr = NSCreateObjectFileImageFromFile(path, &image);
+
+    if (dsoerr == NSObjectFileImageSuccess) {
+#if defined(NSLINKMODULE_OPTION_RETURN_ON_ERROR) && defined(NSLINKMODULE_OPTION_NONE)
+        os_handle = NSLinkModule(image, path,
+                                 NSLINKMODULE_OPTION_RETURN_ON_ERROR |
+                                 NSLINKMODULE_OPTION_NONE);
+        /* If something went wrong, get the errors... */
+        if (!os_handle) {
+            NSLinkEditErrors errors;
+            int errorNumber;
+            const char *fileName;
+            NSLinkEditError(&errors, &errorNumber, &fileName, &err_msg);
+        }
+#else
+        os_handle = NSLinkModule(image, path, FALSE);
+#endif
+        NSDestroyObjectFileImage(image);
+    }
+    else if ((dsoerr == NSObjectFileImageFormat ||
+             dsoerr == NSObjectFileImageInappropriateFile) &&
+             NSAddLibrary(path) == TRUE) {
+        os_handle = (NSModule)DYLD_LIBRARY_HANDLE;
+    }
+    else {
+        err_msg = "cannot create object file image or add library";
+    }
+
+#elif defined(DSO_USE_DLFCN)
+#if defined(OSF1) || defined(SEQUENT) || defined(SNI) ||\
+    (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) ||\
+    defined(__DragonFly__)
+    void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);
+
+#else
+    int flags = RTLD_NOW | RTLD_GLOBAL;
+    void *os_handle;
+#ifdef _AIX
+    if (strchr(path + 1, '(') && path[strlen(path) - 1] == ')')
+    {
+        /* This special archive.a(dso.so) syntax is required for
+         * the way libtool likes to build shared libraries on AIX.
+         * dlopen() support for such a library requires that the
+         * RTLD_MEMBER flag be enabled.
+         */
+        flags |= RTLD_MEMBER;
+    }
+#endif
+    os_handle = dlopen(path, flags);
+#endif    
+#endif /* DSO_USE_x */
+
+    *res_handle = apr_pcalloc(pool, sizeof(**res_handle));
+
+    if(os_handle == NULL) {
+#if defined(DSO_USE_SHL)
+        (*res_handle)->errormsg = strerror(errno);
+        return APR_EDSOOPEN;
+#elif defined(DSO_USE_DYLD)
+        (*res_handle)->errormsg = (err_msg) ? err_msg : "link failed";
+        return APR_EDSOOPEN;
+#elif defined(DSO_USE_DLFCN)
+        (*res_handle)->errormsg = dlerror();
+        return APR_EDSOOPEN;
+#endif
+    }
+
+    (*res_handle)->handle = (void*)os_handle;
+    (*res_handle)->pool = pool;
+    (*res_handle)->errormsg = NULL;
+
+    apr_pool_cleanup_register(pool, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+    return APR_SUCCESS;
+}
+    
+APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                                      apr_dso_handle_t *handle, 
+                                      const char *symname)
+{
+#if defined(DSO_USE_SHL)
+    void *symaddr = NULL;
+    int status;
+
+    errno = 0;
+    status = shl_findsym((void *)&handle->handle, symname, TYPE_PROCEDURE, &symaddr);
+    if (status == -1 && errno == 0) /* try TYPE_DATA instead */
+        status = shl_findsym((void *)&handle->handle, symname, TYPE_DATA, &symaddr);
+    if (status == -1)
+        return APR_ESYMNOTFOUND;
+    *ressym = symaddr;
+    return APR_SUCCESS;
+
+#elif defined(DSO_USE_DYLD)
+    void *retval = NULL;
+    NSSymbol symbol;
+    char *symname2 = (char*)malloc(sizeof(char)*(strlen(symname)+2));
+    sprintf(symname2, "_%s", symname);
+#ifdef NSLINKMODULE_OPTION_PRIVATE
+    if (handle->handle == DYLD_LIBRARY_HANDLE) {
+        symbol = NSLookupAndBindSymbol(symname2);
+    }
+    else {
+        symbol = NSLookupSymbolInModule((NSModule)handle->handle, symname2);
+    }
+#else
+    symbol = NSLookupAndBindSymbol(symname2);
+#endif
+    free(symname2);
+    if (symbol == NULL) {
+        handle->errormsg = "undefined symbol";
+	return APR_ESYMNOTFOUND;
+    }
+    retval = NSAddressOfSymbol(symbol);
+    if (retval == NULL) {
+        handle->errormsg = "cannot resolve symbol";
+	return APR_ESYMNOTFOUND;
+    }
+    *ressym = retval;
+    return APR_SUCCESS;
+#elif defined(DSO_USE_DLFCN)
+
+#if defined(DLSYM_NEEDS_UNDERSCORE)
+    void *retval;
+    char *symbol = (char*)malloc(sizeof(char)*(strlen(symname)+2));
+    sprintf(symbol, "_%s", symname);
+    retval = dlsym(handle->handle, symbol);
+    free(symbol);
+#elif defined(SEQUENT) || defined(SNI)
+    void *retval = dlsym(handle->handle, (char *)symname);
+#else
+    void *retval = dlsym(handle->handle, symname);
+#endif /* DLSYM_NEEDS_UNDERSCORE */
+
+    if (retval == NULL) {
+        handle->errormsg = dlerror();
+        return APR_ESYMNOTFOUND;
+    }
+
+    *ressym = retval;
+    
+    return APR_SUCCESS;
+#endif /* DSO_USE_x */
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, 
+                                        apr_size_t buflen)
+{
+    if (dso->errormsg) {
+        apr_cpystrn(buffer, dso->errormsg, buflen);
+        return dso->errormsg;
+    }
+    return "No Error";
+}
+
+#endif
diff --git a/dso/win32/dso.c b/dso/win32/dso.c
new file mode 100644
index 0000000..d4a6893
--- /dev/null
+++ b/dso/win32/dso.c
@@ -0,0 +1,167 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_dso.h"
+#include "apr_strings.h"
+#include "apr_private.h"
+#include "apr_arch_file_io.h"
+#include "apr_arch_utf8.h"
+
+#if APR_HAS_DSO
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
+                                                apr_os_dso_handle_t osdso,
+                                                apr_pool_t *pool)
+{
+    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
+    (*aprdso)->handle = osdso;
+    (*aprdso)->cont = pool;
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
+                                                apr_dso_handle_t *aprdso)
+{
+    *osdso = aprdso->handle;
+    return APR_SUCCESS;
+}
+
+static apr_status_t dso_cleanup(void *thedso)
+{
+    apr_dso_handle_t *dso = thedso;
+
+    if (dso->handle != NULL && !FreeLibrary(dso->handle)) {
+        return apr_get_os_error();
+    }
+    dso->handle = NULL;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_dso_load(struct apr_dso_handle_t **res_handle, 
+                                       const char *path, apr_pool_t *ctx)
+{
+    HINSTANCE os_handle;
+    apr_status_t rv;
+#ifndef _WIN32_WCE
+    UINT em;
+#endif
+
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE 
+    {
+        apr_wchar_t wpath[APR_PATH_MAX];
+        if ((rv = utf8_to_unicode_path(wpath, sizeof(wpath) 
+                                            / sizeof(apr_wchar_t), path))
+                != APR_SUCCESS) {
+            *res_handle = apr_pcalloc(ctx, sizeof(**res_handle));
+            return ((*res_handle)->load_error = rv);
+        }
+        /* Prevent ugly popups from killing our app */
+#ifndef _WIN32_WCE
+        em = SetErrorMode(SEM_FAILCRITICALERRORS);
+#endif
+        os_handle = LoadLibraryExW(wpath, NULL, 0);
+        if (!os_handle)
+            os_handle = LoadLibraryExW(wpath, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+        if (!os_handle)
+            rv = apr_get_os_error();
+#ifndef _WIN32_WCE
+        SetErrorMode(em);
+#endif
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        char fspec[APR_PATH_MAX], *p = fspec;
+        /* Must convert path from / to \ notation.
+         * 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 for the LoadLibrary family of calls.
+         */
+        apr_cpystrn(fspec, path, sizeof(fspec));
+        while ((p = strchr(p, '/')) != NULL)
+            *p = '\\';
+        
+        /* Prevent ugly popups from killing our app */
+        em = SetErrorMode(SEM_FAILCRITICALERRORS);
+        os_handle = LoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+        if (!os_handle)
+            os_handle = LoadLibraryEx(path, NULL, 0);
+        if (!os_handle)
+            rv = apr_get_os_error();
+        else
+            rv = APR_SUCCESS;
+        SetErrorMode(em);
+    }
+#endif
+
+    *res_handle = apr_pcalloc(ctx, sizeof(**res_handle));
+    (*res_handle)->cont = ctx;
+
+    if (rv) {
+        return ((*res_handle)->load_error = rv);
+    }
+
+    (*res_handle)->handle = (void*)os_handle;
+    (*res_handle)->load_error = APR_SUCCESS;
+
+    apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
+
+    return APR_SUCCESS;
+}
+    
+APR_DECLARE(apr_status_t) apr_dso_unload(struct apr_dso_handle_t *handle)
+{
+    return apr_pool_cleanup_run(handle->cont, handle, dso_cleanup);
+}
+
+APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
+                         struct apr_dso_handle_t *handle, 
+                         const char *symname)
+{
+#ifdef _WIN32_WCE
+    apr_size_t symlen = strlen(symname) + 1;
+    apr_size_t wsymlen = 256;
+    apr_wchar_t wsymname[256];
+    apr_status_t rv;
+
+    rv = apr_conv_utf8_to_ucs2(wsymname, &wsymlen, symname, &symlen);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+    else if (symlen) {
+        return APR_ENAMETOOLONG;
+    }
+
+    *ressym = (apr_dso_handle_sym_t)GetProcAddressW(handle->handle, wsymname);
+#else
+    *ressym = (apr_dso_handle_sym_t)GetProcAddress(handle->handle, symname);
+#endif
+    if (!*ressym) {
+        return apr_get_os_error();
+    }
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buf, apr_size_t bufsize)
+{
+    return apr_strerror(dso->load_error, buf, bufsize);
+}
+
+#endif