Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/dso/dso_dlfcn.c	Lines:	0	121	0.0 %
Date:	2017-11-07	Branches:	0	74	0.0 %


/* $OpenBSD: dso_dlfcn.c,v 1.29 2017/01/29 17:49:23 beck Exp $ */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <string.h>

#include <openssl/dso.h>
#include <openssl/err.h>

#ifndef DSO_DLFCN
DSO_METHOD *
DSO_METHOD_dlfcn(void)
{
	return NULL;
}
#else

#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
# define HAVE_DLINFO 1
#endif

/* Part of the hack in "dlfcn_load" ... */
#define DSO_MAX_TRANSLATED_SIZE 256

static int dlfcn_load(DSO *dso);
static int dlfcn_unload(DSO *dso);
static void *dlfcn_bind_var(DSO *dso, const char *symname);
static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
static char *dlfcn_name_converter(DSO *dso, const char *filename);
static char *dlfcn_merger(DSO *dso, const char *filespec1,
    const char *filespec2);
static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
static void *dlfcn_globallookup(const char *name);

static DSO_METHOD dso_meth_dlfcn = {
	.name = "OpenSSL 'dlfcn' shared library method",
	.dso_load = dlfcn_load,
	.dso_unload = dlfcn_unload,
	.dso_bind_var = dlfcn_bind_var,
	.dso_bind_func = dlfcn_bind_func,
	.dso_name_converter = dlfcn_name_converter,
	.dso_merger = dlfcn_merger,
	.pathbyaddr = dlfcn_pathbyaddr,
	.globallookup = dlfcn_globallookup
};

DSO_METHOD *
DSO_METHOD_dlfcn(void)
{
	return (&dso_meth_dlfcn);
}

/* For this DSO_METHOD, our meth_data STACK will contain;
 * (i) the handle (void*) returned from dlopen().
 */

static int
dlfcn_load(DSO *dso)
{
	void *ptr = NULL;
	/* See applicable comments in dso_dl.c */
	char *filename = DSO_convert_filename(dso, NULL);
	int flags = RTLD_LAZY;

	if (filename == NULL) {
		DSOerror(DSO_R_NO_FILENAME);
		goto err;
	}

	if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
		flags |= RTLD_GLOBAL;
	ptr = dlopen(filename, flags);
	if (ptr == NULL) {
		DSOerror(DSO_R_LOAD_FAILED);
		ERR_asprintf_error_data("filename(%s): %s", filename,
		    dlerror());
		goto err;
	}
	if (!sk_void_push(dso->meth_data, (char *)ptr)) {
		DSOerror(DSO_R_STACK_ERROR);
		goto err;
	}
	/* Success */
	dso->loaded_filename = filename;
	return (1);

err:
	/* Cleanup! */
	free(filename);
	if (ptr != NULL)
		dlclose(ptr);
	return (0);
}

static int
dlfcn_unload(DSO *dso)
{
	void *ptr;
	if (dso == NULL) {
		DSOerror(ERR_R_PASSED_NULL_PARAMETER);
		return (0);
	}
	if (sk_void_num(dso->meth_data) < 1)
		return (1);
	ptr = sk_void_pop(dso->meth_data);
	if (ptr == NULL) {
		DSOerror(DSO_R_NULL_HANDLE);
		/* Should push the value back onto the stack in
		 * case of a retry. */
		sk_void_push(dso->meth_data, ptr);
		return (0);
	}
	/* For now I'm not aware of any errors associated with dlclose() */
	dlclose(ptr);
	return (1);
}

static void *
dlfcn_bind_var(DSO *dso, const char *symname)
{
	void *ptr, *sym;

	if ((dso == NULL) || (symname == NULL)) {
		DSOerror(ERR_R_PASSED_NULL_PARAMETER);
		return (NULL);
	}
	if (sk_void_num(dso->meth_data) < 1) {
		DSOerror(DSO_R_STACK_ERROR);
		return (NULL);
	}
	ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
	if (ptr == NULL) {
		DSOerror(DSO_R_NULL_HANDLE);
		return (NULL);
	}
	sym = dlsym(ptr, symname);
	if (sym == NULL) {
		DSOerror(DSO_R_SYM_FAILURE);
		ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
		return (NULL);
	}
	return (sym);
}

static DSO_FUNC_TYPE
dlfcn_bind_func(DSO *dso, const char *symname)
{
	void *ptr;
	union {
		DSO_FUNC_TYPE sym;
		void *dlret;
	} u;

	if ((dso == NULL) || (symname == NULL)) {
		DSOerror(ERR_R_PASSED_NULL_PARAMETER);
		return (NULL);
	}
	if (sk_void_num(dso->meth_data) < 1) {
		DSOerror(DSO_R_STACK_ERROR);
		return (NULL);
	}
	ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
	if (ptr == NULL) {
		DSOerror(DSO_R_NULL_HANDLE);
		return (NULL);
	}
	u.dlret = dlsym(ptr, symname);
	if (u.dlret == NULL) {
		DSOerror(DSO_R_SYM_FAILURE);
		ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
		return (NULL);
	}
	return u.sym;
}

static char *
dlfcn_merger(DSO *dso, const char *filespec1, const char *filespec2)
{
	char *merged;

	if (!filespec1 && !filespec2) {
		DSOerror(ERR_R_PASSED_NULL_PARAMETER);
		return (NULL);
	}
	/* If the first file specification is a rooted path, it rules.
	   same goes if the second file specification is missing. */
	if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
		merged = strdup(filespec1);
		if (!merged) {
			DSOerror(ERR_R_MALLOC_FAILURE);
			return (NULL);
		}
	}
	/* If the first file specification is missing, the second one rules. */
	else if (!filespec1) {
		merged = strdup(filespec2);
		if (!merged) {
			DSOerror(ERR_R_MALLOC_FAILURE);
			return (NULL);
		}
	} else
		/* This part isn't as trivial as it looks.  It assumes that
		   the second file specification really is a directory, and
		   makes no checks whatsoever.  Therefore, the result becomes
		   the concatenation of filespec2 followed by a slash followed
		   by filespec1. */
	{
		size_t spec2len, len;

		spec2len = strlen(filespec2);
		len = spec2len + (filespec1 ? strlen(filespec1) : 0);

		if (filespec2 && filespec2[spec2len - 1] == '/') {
			spec2len--;
			len--;
		}
		merged = malloc(len + 2);
		if (!merged) {
			DSOerror(ERR_R_MALLOC_FAILURE);
			return (NULL);
		}
		strlcpy(merged, filespec2, len + 2);
		merged[spec2len] = '/';
		strlcpy(&merged[spec2len + 1], filespec1, len + 1 - spec2len);
	}
	return (merged);
}

#define DSO_ext	".so"
#define DSO_extlen 3

static char *
dlfcn_name_converter(DSO *dso, const char *filename)
{
	char *translated;
	int ret;

	if (strchr(filename, '/') == NULL) {
		/* Bare name, so convert to "%s.so" or "lib%s.so" */
		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
			ret = asprintf(&translated, "lib%s" DSO_ext, filename);
		else
			ret = asprintf(&translated, "%s" DSO_ext, filename);
		if (ret == -1)
			translated = NULL;
	} else {
		/* Full path, so just duplicate it */
		translated = strdup(filename);
	}

	if (translated == NULL)
		DSOerror(DSO_R_NAME_TRANSLATION_FAILED);
	return (translated);
}

static int
dlfcn_pathbyaddr(void *addr, char *path, int sz)
{
	Dl_info dli;
	int len;

	if (addr == NULL) {
		union{
			int(*f)(void*, char*, int);
			void *p;
		} t = { dlfcn_pathbyaddr };
		addr = t.p;
	}

	if (dladdr(addr, &dli)) {
		len = (int)strlen(dli.dli_fname);
		if (sz <= 0)
			return len + 1;
		if (len >= sz)
			len = sz - 1;
		memcpy(path, dli.dli_fname, len);
		path[len++] = 0;
		return len;
	}

	ERR_asprintf_error_data("dlfcn_pathbyaddr(): %s", dlerror());
	return -1;
}

static void *
dlfcn_globallookup(const char *name)
{
	void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);

	if (handle) {
		ret = dlsym(handle, name);
		dlclose(handle);
	}

	return ret;
}
#endif /* DSO_DLFCN */


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dso_dlfcn.c,v 1.29 2017/01/29 17:49:23 beck Exp $ */
2			/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3			* project 2000.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
57			*/
58
59			#include <stdio.h>
60			#include <string.h>
61
62			#include <openssl/dso.h>
63			#include <openssl/err.h>
64
65			#ifndef DSO_DLFCN
66			DSO_METHOD *
67			DSO_METHOD_dlfcn(void)
68			{
69			return NULL;
70			}
71			#else
72
73			#ifdef HAVE_DLFCN_H
74			# include <dlfcn.h>
75			# define HAVE_DLINFO 1
76			#endif
77
78			/* Part of the hack in "dlfcn_load" ... */
79			#define DSO_MAX_TRANSLATED_SIZE 256
80
81			static int dlfcn_load(DSO *dso);
82			static int dlfcn_unload(DSO *dso);
83			static void dlfcn_bind_var(DSO dso, const char *symname);
84			static DSO_FUNC_TYPE dlfcn_bind_func(DSO dso, const char symname);
85			static char dlfcn_name_converter(DSO dso, const char *filename);
86			static char dlfcn_merger(DSO dso, const char *filespec1,
87			const char *filespec2);
88			static int dlfcn_pathbyaddr(void addr, char path, int sz);
89			static void dlfcn_globallookup(const char name);
90
91			static DSO_METHOD dso_meth_dlfcn = {
92			.name = "OpenSSL 'dlfcn' shared library method",
93			.dso_load = dlfcn_load,
94			.dso_unload = dlfcn_unload,
95			.dso_bind_var = dlfcn_bind_var,
96			.dso_bind_func = dlfcn_bind_func,
97			.dso_name_converter = dlfcn_name_converter,
98			.dso_merger = dlfcn_merger,
99			.pathbyaddr = dlfcn_pathbyaddr,
100			.globallookup = dlfcn_globallookup
101			};
102
103			DSO_METHOD *
104			DSO_METHOD_dlfcn(void)
105			{
106			return (&dso_meth_dlfcn);
107			}
108
109			/* For this DSO_METHOD, our meth_data STACK will contain;
110			* (i) the handle (void*) returned from dlopen().
111			*/
112
113			static int
114			dlfcn_load(DSO *dso)
115			{
116			void *ptr = NULL;
117			/* See applicable comments in dso_dl.c */
118			char *filename = DSO_convert_filename(dso, NULL);
119			int flags = RTLD_LAZY;
120
121			if (filename == NULL) {
122			DSOerror(DSO_R_NO_FILENAME);
123			goto err;
124			}
125
126			if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
127			flags \|= RTLD_GLOBAL;
128			ptr = dlopen(filename, flags);
129			if (ptr == NULL) {
130			DSOerror(DSO_R_LOAD_FAILED);
131			ERR_asprintf_error_data("filename(%s): %s", filename,
132			dlerror());
133			goto err;
134			}
135			if (!sk_void_push(dso->meth_data, (char *)ptr)) {
136			DSOerror(DSO_R_STACK_ERROR);
137			goto err;
138			}
139			/* Success */
140			dso->loaded_filename = filename;
141			return (1);
142
143			err:
144			/* Cleanup! */
145			free(filename);
146			if (ptr != NULL)
147			dlclose(ptr);
148			return (0);
149			}
150
151			static int
152			dlfcn_unload(DSO *dso)
153			{
154			void *ptr;
155			if (dso == NULL) {
156			DSOerror(ERR_R_PASSED_NULL_PARAMETER);
157			return (0);
158			}
159			if (sk_void_num(dso->meth_data) < 1)
160			return (1);
161			ptr = sk_void_pop(dso->meth_data);
162			if (ptr == NULL) {
163			DSOerror(DSO_R_NULL_HANDLE);
164			/* Should push the value back onto the stack in
165			* case of a retry. */
166			sk_void_push(dso->meth_data, ptr);
167			return (0);
168			}
169			/* For now I'm not aware of any errors associated with dlclose() */
170			dlclose(ptr);
171			return (1);
172			}
173
174			static void *
175			dlfcn_bind_var(DSO dso, const char symname)
176			{
177			void ptr, sym;
178
179			if ((dso == NULL) \|\| (symname == NULL)) {
180			DSOerror(ERR_R_PASSED_NULL_PARAMETER);
181			return (NULL);
182			}
183			if (sk_void_num(dso->meth_data) < 1) {
184			DSOerror(DSO_R_STACK_ERROR);
185			return (NULL);
186			}
187			ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
188			if (ptr == NULL) {
189			DSOerror(DSO_R_NULL_HANDLE);
190			return (NULL);
191			}
192			sym = dlsym(ptr, symname);
193			if (sym == NULL) {
194			DSOerror(DSO_R_SYM_FAILURE);
195			ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
196			return (NULL);
197			}
198			return (sym);
199			}
200
201			static DSO_FUNC_TYPE
202			dlfcn_bind_func(DSO dso, const char symname)
203			{
204			void *ptr;
205			union {
206			DSO_FUNC_TYPE sym;
207			void *dlret;
208			} u;
209
210			if ((dso == NULL) \|\| (symname == NULL)) {
211			DSOerror(ERR_R_PASSED_NULL_PARAMETER);
212			return (NULL);
213			}
214			if (sk_void_num(dso->meth_data) < 1) {
215			DSOerror(DSO_R_STACK_ERROR);
216			return (NULL);
217			}
218			ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
219			if (ptr == NULL) {
220			DSOerror(DSO_R_NULL_HANDLE);
221			return (NULL);
222			}
223			u.dlret = dlsym(ptr, symname);
224			if (u.dlret == NULL) {
225			DSOerror(DSO_R_SYM_FAILURE);
226			ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
227			return (NULL);
228			}
229			return u.sym;
230			}
231
232			static char *
233			dlfcn_merger(DSO dso, const char filespec1, const char *filespec2)
234			{
235			char *merged;
236
237			if (!filespec1 && !filespec2) {
238			DSOerror(ERR_R_PASSED_NULL_PARAMETER);
239			return (NULL);
240			}
241			/* If the first file specification is a rooted path, it rules.
242			same goes if the second file specification is missing. */
243			if (!filespec2 \|\| (filespec1 != NULL && filespec1[0] == '/')) {
244			merged = strdup(filespec1);
245			if (!merged) {
246			DSOerror(ERR_R_MALLOC_FAILURE);
247			return (NULL);
248			}
249			}
250			/* If the first file specification is missing, the second one rules. */
251			else if (!filespec1) {
252			merged = strdup(filespec2);
253			if (!merged) {
254			DSOerror(ERR_R_MALLOC_FAILURE);
255			return (NULL);
256			}
257			} else
258			/* This part isn't as trivial as it looks. It assumes that
259			the second file specification really is a directory, and
260			makes no checks whatsoever. Therefore, the result becomes
261			the concatenation of filespec2 followed by a slash followed
262			by filespec1. */
263			{
264			size_t spec2len, len;
265
266			spec2len = strlen(filespec2);
267			len = spec2len + (filespec1 ? strlen(filespec1) : 0);
268
269			if (filespec2 && filespec2[spec2len - 1] == '/') {
270			spec2len--;
271			len--;
272			}
273			merged = malloc(len + 2);
274			if (!merged) {
275			DSOerror(ERR_R_MALLOC_FAILURE);
276			return (NULL);
277			}
278			strlcpy(merged, filespec2, len + 2);
279			merged[spec2len] = '/';
280			strlcpy(&merged[spec2len + 1], filespec1, len + 1 - spec2len);
281			}
282			return (merged);
283			}
284
285			#define DSO_ext ".so"
286			#define DSO_extlen 3
287
288			static char *
289			dlfcn_name_converter(DSO dso, const char filename)
290			{
291			char *translated;
292			int ret;
293
294			if (strchr(filename, '/') == NULL) {
295			/* Bare name, so convert to "%s.so" or "lib%s.so" */
296			if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
297			ret = asprintf(&translated, "lib%s" DSO_ext, filename);
298			else
299			ret = asprintf(&translated, "%s" DSO_ext, filename);
300			if (ret == -1)
301			translated = NULL;
302			} else {
303			/* Full path, so just duplicate it */
304			translated = strdup(filename);
305			}
306
307			if (translated == NULL)
308			DSOerror(DSO_R_NAME_TRANSLATION_FAILED);
309			return (translated);
310			}
311
312			static int
313			dlfcn_pathbyaddr(void addr, char path, int sz)
314			{
315			Dl_info dli;
316			int len;
317
318			if (addr == NULL) {
319			union{
320			int(f)(void, char*, int);
321			void *p;
322			} t = { dlfcn_pathbyaddr };
323			addr = t.p;
324			}
325
326			if (dladdr(addr, &dli)) {
327			len = (int)strlen(dli.dli_fname);
328			if (sz <= 0)
329			return len + 1;
330			if (len >= sz)
331			len = sz - 1;
332			memcpy(path, dli.dli_fname, len);
333			path[len++] = 0;
334			return len;
335			}
336
337			ERR_asprintf_error_data("dlfcn_pathbyaddr(): %s", dlerror());
338			return -1;
339			}
340
341			static void *
342			dlfcn_globallookup(const char *name)
343			{
344			void ret = NULL, handle = dlopen(NULL, RTLD_LAZY);
345
346			if (handle) {
347			ret = dlsym(handle, name);
348			dlclose(handle);
349			}
350
351			return ret;
352			}
353			#endif /* DSO_DLFCN */