From 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:49:52 +0200 Subject: Adding upstream version 255.4. Signed-off-by: Daniel Baumann --- src/basic/umask-util.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 src/basic/umask-util.h (limited to 'src/basic/umask-util.h') diff --git a/src/basic/umask-util.h b/src/basic/umask-util.h new file mode 100644 index 0000000..00417fa --- /dev/null +++ b/src/basic/umask-util.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include +#include +#include + +#include "macro.h" + +static inline void umaskp(mode_t *u) { + umask(*u); +} + +#define _cleanup_umask_ _cleanup_(umaskp) + +/* We make use of the fact here that the umask() syscall uses only the lower 9 bits of mode_t, although + * mode_t has space for the file type in the bits further up. We simply OR in the file type mask S_IFMT to + * distinguish the first and the second iteration of the WITH_UMASK() loop, so that we can run the first one, + * and exit on the second. */ + +assert_cc((S_IFMT & 0777) == 0); + +#define WITH_UMASK(mask) \ + for (_cleanup_umask_ mode_t _saved_umask_ = umask(mask) | S_IFMT; \ + FLAGS_SET(_saved_umask_, S_IFMT); \ + _saved_umask_ &= 0777) + +#define BLOCK_WITH_UMASK(mask) \ + _unused_ _cleanup_umask_ mode_t _saved_umask_ = umask(mask); -- cgit v1.2.3