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

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explicit_bzero.c
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1/*-------------------------------------------------------------------------
2 *
3 * explicit_bzero.c
4 *
5 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
6 * Portions Copyright (c) 1994, Regents of the University of California
7 *
8 *
9 * IDENTIFICATION
10 * src/port/explicit_bzero.c
11 *
12 *-------------------------------------------------------------------------
13 */
14
15 #define __STDC_WANT_LIB_EXT1__ 1 /* needed to access memset_s() */
16
17#include "c.h"
18
19#if HAVE_DECL_MEMSET_S
20
21void
22explicit_bzero(void *buf, size_t len)
23{
24 (void) memset_s(buf, len, 0, len);
25}
26
27#elif defined(WIN32)
28
29void
30explicit_bzero(void *buf, size_t len)
31{
32 (void) SecureZeroMemory(buf, len);
33}
34
35#else
36
37/*
38 * Indirect call through a volatile pointer to hopefully avoid dead-store
39 * optimisation eliminating the call. (Idea taken from OpenSSH.) We can't
40 * assume bzero() is present either, so for simplicity we define our own.
41 */
42
43static void
44 bzero2(void *buf, size_t len)
45{
46 memset(buf, 0, len);
47}
48
49 static void (*volatile bzero_p) (void *, size_t) = bzero2;
50
51void
52 explicit_bzero(void *buf, size_t len)
53{
54 bzero_p(buf, len);
55}
56
57#endif
static void(*volatile bzero_p)(void *, size_t)
Definition: explicit_bzero.c:49
void explicit_bzero(void *buf, size_t len)
Definition: explicit_bzero.c:52
static void bzero2(void *buf, size_t len)
Definition: explicit_bzero.c:44
const void size_t len
static char * buf
Definition: pg_test_fsync.c:72

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