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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
commit | 5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch) | |
tree | 739caf8c461053357daa9f162bef34516c7bf452 /src/port/explicit_bzero.c | |
parent | Initial commit. (diff) | |
download | postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip |
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/port/explicit_bzero.c')
-rw-r--r-- | src/port/explicit_bzero.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/port/explicit_bzero.c b/src/port/explicit_bzero.c new file mode 100644 index 0000000..0d504eb --- /dev/null +++ b/src/port/explicit_bzero.c @@ -0,0 +1,55 @@ +/*------------------------------------------------------------------------- + * + * explicit_bzero.c + * + * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/port/explicit_bzero.c + * + *------------------------------------------------------------------------- + */ + +#include "c.h" + +#if defined(HAVE_MEMSET_S) + +void +explicit_bzero(void *buf, size_t len) +{ + (void) memset_s(buf, len, 0, len); +} + +#elif defined(WIN32) + +void +explicit_bzero(void *buf, size_t len) +{ + (void) SecureZeroMemory(buf, len); +} + +#else + +/* + * Indirect call through a volatile pointer to hopefully avoid dead-store + * optimisation eliminating the call. (Idea taken from OpenSSH.) We can't + * assume bzero() is present either, so for simplicity we define our own. + */ + +static void +bzero2(void *buf, size_t len) +{ + memset(buf, 0, len); +} + +static void (*volatile bzero_p) (void *, size_t) = bzero2; + +void +explicit_bzero(void *buf, size_t len) +{ + bzero_p(buf, len); +} + +#endif |