1 /* $NetBSD: openpam_dlfunc.h,v 1.4 2023/06/30 21:46:20 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2013 Dag-Erling Smørgrav
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 * products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef OPENPAM_DLFCN_H_INCLUDED
33 #define OPENPAM_DLFCN_H_INCLUDED
34
35 #ifndef HAVE_DLFUNC
36 /*-
37 * The actual type declared by this typedef is immaterial, provided that
38 * it is a function pointer. Its purpose is to provide a return type for
39 * dlfunc() which can be cast to a function pointer type without depending
40 * on behavior undefined by the C standard, which might trigger a compiler
41 * diagnostic. We intentionally declare a unique type signature to force
42 * a diagnostic should the application not cast the return value of dlfunc()
43 * appropriately.
44 */
45 struct __dlfunc_arg {
46 int __dlfunc_dummy;
47 };
48
49 typedef void (*dlfunc_t)(struct __dlfunc_arg);
50
51 static inline dlfunc_t
dlfunc(void * handle,const char * symbol)52 dlfunc(void *handle, const char *symbol)
53 {
54
55 return ((dlfunc_t)dlsym(handle, symbol));
56 }
57 #endif
58
59 #endif
60