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8980a53f24
umask(2) says that the kernel does this exact operation on its own, so we can drop if from our call.
30 lines
999 B
C
30 lines
999 B
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdbool.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "macro.h"
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static inline void umaskp(mode_t *u) {
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umask(*u);
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}
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#define _cleanup_umask_ _cleanup_(umaskp)
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/* We make use of the fact here that the umask() syscall uses only the lower 9 bits of mode_t, although
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* mode_t has space for the file type in the bits further up. We simply OR in the file type mask S_IFMT to
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* distinguish the first and the second iteration of the WITH_UMASK() loop, so that we can run the first one,
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* and exit on the second. */
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assert_cc((S_IFMT & 0777) == 0);
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#define WITH_UMASK(mask) \
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for (_cleanup_umask_ mode_t _saved_umask_ = umask(mask) | S_IFMT; \
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FLAGS_SET(_saved_umask_, S_IFMT); \
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_saved_umask_ &= 0777)
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#define BLOCK_WITH_UMASK(mask) \
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_unused_ _cleanup_umask_ mode_t _saved_umask_ = umask(mask);
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