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ca1e85513e
dlopen() is in SUSv2 and all targeted Unix systems have it. We still need replacement functions for Windows, but we don't need a configure probe for that. Since it's no longer needed by other operating systems, rename dlopen.c to win32dlopen.c and move the declarations into win32_port.h. Likewise, the macros RTLD_NOW and RTLD_GLOBAL now only need to be defined on Windows, since all targeted Unix systems have 'em. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CA+hUKGJ3LHeP9w5Fgzdr4G8AnEtJ=z=p6hGDEm4qYGEUX5B6fQ@mail.gmail.com
94 lines
1.6 KiB
C
94 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* win32dlopen.c
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* dynamic loader for Windows
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/port/win32dlopen.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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static char last_dyn_error[512];
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static void
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set_dl_error(void)
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{
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DWORD err = GetLastError();
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if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
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FORMAT_MESSAGE_FROM_SYSTEM,
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NULL,
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err,
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MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
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last_dyn_error,
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sizeof(last_dyn_error) - 1,
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NULL) == 0)
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{
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snprintf(last_dyn_error, sizeof(last_dyn_error) - 1,
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"unknown error %lu", err);
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}
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}
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char *
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dlerror(void)
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{
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if (last_dyn_error[0])
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return last_dyn_error;
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else
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return NULL;
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}
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int
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dlclose(void *handle)
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{
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if (!FreeLibrary((HMODULE) handle))
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{
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set_dl_error();
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return 1;
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}
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last_dyn_error[0] = 0;
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return 0;
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}
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void *
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dlsym(void *handle, const char *symbol)
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{
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void *ptr;
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ptr = GetProcAddress((HMODULE) handle, symbol);
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if (!ptr)
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{
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set_dl_error();
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return NULL;
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}
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last_dyn_error[0] = 0;
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return ptr;
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}
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void *
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dlopen(const char *file, int mode)
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{
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HMODULE h;
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int prevmode;
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/* Disable popup error messages when loading DLLs */
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prevmode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
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h = LoadLibrary(file);
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SetErrorMode(prevmode);
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if (!h)
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{
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set_dl_error();
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return NULL;
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}
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last_dyn_error[0] = 0;
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return (void *) h;
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}
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