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netbsd.c
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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/netbsd.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 *
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 *
58 BSD44_derived_dlopen(const char *file, int num)
59 {
60 #if !defined(HAVE_DLOPEN)
62  "dlopen (%s) not supported", file);
63  return NULL;
64 #else
65  void *vp;
66 
67  if ((vp = dlopen((char *) file, num)) == NULL)
69  "dlopen (%s) failed: %s", file, dlerror());
70  return vp;
71 #endif
72 }
73 
74 void *
75 BSD44_derived_dlsym(void *handle, const char *name)
76 {
77 #if !defined(HAVE_DLOPEN)
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)
95  "dlsym (%s) failed", name);
96  return vp;
97 #endif
98 }
99 
100 void
102 {
103 #if defined(HAVE_DLOPEN)
104  dlclose(handle);
105 #endif
106 }
char * dlerror(void)
Definition: win32.c:32
void * BSD44_derived_dlopen(const char *file, int num)
Definition: netbsd.c:58
static char error_message[BUFSIZ]
Definition: netbsd.c:45
char * BSD44_derived_dlerror(void)
Definition: netbsd.c:48
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
void BSD44_derived_dlclose(void *handle)
Definition: netbsd.c:101
int dlclose(void *handle)
Definition: win32.c:41
void * BSD44_derived_dlsym(void *handle, const char *name)
Definition: netbsd.c:75
void * dlsym(void *handle, const char *symbol)
Definition: win32.c:53
static char * buf
Definition: pg_test_fsync.c:65
#define NULL
Definition: c.h:226
const char * name
Definition: encode.c:521
void * dlopen(const char *path, int mode)
Definition: win32.c:68