src/backend/port/dynloader/netbsd.c

   1 /*
   2  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   3  * Portions Copyright (c) 1990 The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * $PostgreSQL$
   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 *
  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 *
  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 *
  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 #elif defined(__ELF__)
  82         return dlsym(handle, name);
  83 #else
  84         void       *vp;
  85         char            buf[BUFSIZ];
  86
  87         if (*name != '_')
  88         {
  89                 snprintf(buf, sizeof(buf), "_%s", name);
  90                 name = buf;
  91         }
  92         if ((vp = dlsym(handle, (char *) name)) == NULL)
  93                 snprintf(error_message, sizeof(error_message),
  94                                  "dlsym (%s) failed", name);
  95         return vp;
  96 #endif
  97 }
  98
  99 void
 100 BSD44_derived_dlclose(void *handle)
 101 {
 102 #if !defined(HAVE_DLOPEN)
 103 #else
 104         dlclose(handle);
 105 #endif
 106 }