1 /*
2 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
3 * Portions Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * src/backend/port/dynloader/openbsd.c
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 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)dl.c 5.4 (Berkeley) 2/23/91";
35 #endif /* LIBC_SCCS and not lint */
36
37 #include "postgres.h"
38
39 #include <nlist.h>
40 #include <link.h>
41 #include <dlfcn.h>
42
43 #include "dynloader.h"
44
45 static char error_message[BUFSIZ];
46
47 char *
BSD44_derived_dlerror(void)48 BSD44_derived_dlerror(void)
49 {
50 static char ret[BUFSIZ];
51
52 strcpy(ret, error_message);
53 error_message[0] = 0;
54 return (ret[0] == 0) ? NULL : ret;
55 }
56
57 void *
BSD44_derived_dlopen(const char * file,int num)58 BSD44_derived_dlopen(const char *file, int num)
59 {
60 #if !defined(HAVE_DLOPEN)
61 snprintf(error_message, sizeof(error_message),
62 "dlopen (%s) not supported", file);
63 return NULL;
64 #else
65 void *vp;
66
67 if ((vp = dlopen((char *) file, num)) == NULL)
68 snprintf(error_message, sizeof(error_message),
69 "dlopen (%s) failed: %s", file, dlerror());
70 return vp;
71 #endif
72 }
73
74 void *
BSD44_derived_dlsym(void * handle,const char * name)75 BSD44_derived_dlsym(void *handle, const char *name)
76 {
77 #if !defined(HAVE_DLOPEN)
78 snprintf(error_message, sizeof(error_message),
79 "dlsym (%s) failed", name);
80 return NULL;
81 #else
82 void *vp;
83
84 #ifndef __ELF__
85 char buf[BUFSIZ];
86
87 if (*name != '_')
88 {
89 snprintf(buf, sizeof(buf), "_%s", name);
90 name = buf;
91 }
92 #endif /* !__ELF__ */
93 if ((vp = dlsym(handle, (char *) name)) == NULL)
94 snprintf(error_message, sizeof(error_message),
95 "dlsym (%s) failed", name);
96 return vp;
97 #endif
98 }
99
100 void
BSD44_derived_dlclose(void * handle)101 BSD44_derived_dlclose(void *handle)
102 {
103 #if defined(HAVE_DLOPEN)
104 dlclose(handle);
105 #endif
106 }
107