PostgreSQL Source Code: src/port/win32ntdll.c Source File

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win32ntdll.c
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1/*-------------------------------------------------------------------------
2 *
3 * win32ntdll.c
4 * Dynamically loaded Windows NT functions.
5 *
6 * Portions Copyright (c) 2021-2025, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/port/win32ntdll.c
12 *
13 *-------------------------------------------------------------------------
14 */
15
16#include "c.h"
17
18#include "port/win32ntdll.h"
19
20 RtlGetLastNtStatus_t pg_RtlGetLastNtStatus;
21 RtlNtStatusToDosError_t pg_RtlNtStatusToDosError;
22 NtFlushBuffersFileEx_t pg_NtFlushBuffersFileEx;
23
24 typedef struct NtDllRoutine
25{
26 const char *name;
27 pg_funcptr_t *address;
28 } NtDllRoutine;
29
30 static const NtDllRoutine routines[] = {
31 {"RtlGetLastNtStatus", (pg_funcptr_t *) &pg_RtlGetLastNtStatus},
32 {"RtlNtStatusToDosError", (pg_funcptr_t *) &pg_RtlNtStatusToDosError},
33 {"NtFlushBuffersFileEx", (pg_funcptr_t *) &pg_NtFlushBuffersFileEx}
34};
35
36 static bool initialized;
37
38int
39 initialize_ntdll(void)
40{
41 HMODULE module;
42
43 if (initialized)
44 return 0;
45
46 if (!(module = LoadLibraryEx("ntdll.dll", NULL, 0)))
47 {
48 _dosmaperr(GetLastError());
49 return -1;
50 }
51
52 for (int i = 0; i < lengthof(routines); ++i)
53 {
54 pg_funcptr_t address;
55
56 address = (pg_funcptr_t) GetProcAddress(module, routines[i].name);
57 if (!address)
58 {
59 _dosmaperr(GetLastError());
60 FreeLibrary(module);
61
62 return -1;
63 }
64
65 *(pg_funcptr_t *) routines[i].address = address;
66 }
67
68 initialized = true;
69
70 return 0;
71}
#define lengthof(array)
Definition: c.h:787
void(* pg_funcptr_t)(void)
Definition: c.h:460
i
int i
Definition: isn.c:77
pg_funcptr_t * address
Definition: win32ntdll.c:27
const char * name
Definition: win32ntdll.c:26
const char * name
void _dosmaperr(unsigned long)
Definition: win32error.c:177
NtFlushBuffersFileEx_t pg_NtFlushBuffersFileEx
Definition: win32ntdll.c:22
struct NtDllRoutine NtDllRoutine
int initialize_ntdll(void)
Definition: win32ntdll.c:39
RtlGetLastNtStatus_t pg_RtlGetLastNtStatus
Definition: win32ntdll.c:20
static const NtDllRoutine routines[]
Definition: win32ntdll.c:30
RtlNtStatusToDosError_t pg_RtlNtStatusToDosError
Definition: win32ntdll.c:21
static bool initialized
Definition: win32ntdll.c:36
NTSTATUS(__stdcall * RtlGetLastNtStatus_t)(void)
Definition: win32ntdll.h:24
NTSTATUS(__stdcall * NtFlushBuffersFileEx_t)(HANDLE, ULONG, PVOID, ULONG, PIO_STATUS_BLOCK)
Definition: win32ntdll.h:26
ULONG(__stdcall * RtlNtStatusToDosError_t)(NTSTATUS)
Definition: win32ntdll.h:25

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