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/*-------------------------------------------------------------------------
*
* dlopen.c
* dynamic loader for platforms without dlopen()
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/dlopen.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#if defined(__hpux)
/* System includes */
#include <a.out.h>
#include <dl.h>
void *
dlopen(const char *file, int mode)
{
int flags = 0;
if (mode & RTLD_NOW)
flags |= BIND_IMMEDIATE;
#ifdef NOT_USED
if (mode & RTLD_LAZY)
flags |= BIND_DEFERRED;
#endif
return shl_load(file, flags | BIND_VERBOSE, 0L);
}
void *
dlsym(void *handle, const char *symbol)
{
void *value;
if (shl_findsym((shl_t *) & handle, symbol, TYPE_PROCEDURE, &value) == -1)
return NULL;
return value;
}
int
dlclose(void *handle)
{
return shl_unload((shl_t) handle);
}
char *
dlerror(void)
{
static char errmsg[] = "shl_load failed";
if (errno)
return strerror(errno);
return errmsg;
}
#elif defined(WIN32)
static char last_dyn_error[512];
static void
set_dl_error(void)
{
DWORD err = GetLastError();
if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
err,
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
last_dyn_error,
sizeof(last_dyn_error) - 1,
NULL) == 0)
{
snprintf(last_dyn_error, sizeof(last_dyn_error) - 1,
"unknown error %lu", err);
}
}
char *
dlerror(void)
{
if (last_dyn_error[0])
return last_dyn_error;
else
return NULL;
}
int
dlclose(void *handle)
{
if (!FreeLibrary((HMODULE) handle))
{
set_dl_error();
return 1;
}
last_dyn_error[0] = 0;
return 0;
}
void *
dlsym(void *handle, const char *symbol)
{
void *ptr;
ptr = GetProcAddress((HMODULE) handle, symbol);
if (!ptr)
{
set_dl_error();
return NULL;
}
last_dyn_error[0] = 0;
return ptr;
}
void *
dlopen(const char *file, int mode)
{
HMODULE h;
int prevmode;
/* Disable popup error messages when loading DLLs */
prevmode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
h = LoadLibrary(file);
SetErrorMode(prevmode);
if (!h)
{
set_dl_error();
return NULL;
}
last_dyn_error[0] = 0;
return (void *) h;
}
#endif
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