[thirdparty/systemd.git] / src / basic / umask-util.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

#include <stdbool.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "macro.h"

static inline void umaskp(mode_t *u) {
        umask(*u & 0777);
}

#define _cleanup_umask_ _cleanup_(umaskp)

/* We make use of the fact here that the umask() concept is using 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 RUN_WITH_UMASK() loop, so that we can run the first
 * one, and exit on the second. */

assert_cc((S_IFMT & 0777) == 0);

#define RUN_WITH_UMASK(mask)                                            \
        for (_cleanup_umask_ mode_t _saved_umask_ = umask(mask) | S_IFMT; \
             FLAGS_SET(_saved_umask_, S_IFMT);                          \
             _saved_umask_ &= 0777)
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
affb60b1 LP	2	#pragma once
affb60b1 LP	3
affb60b1 LP	4	#include <stdbool.h>
	5	#include <sys/stat.h>
	6	#include <sys/types.h>
	7
	8	#include "macro.h"
	9
	10	static inline void umaskp(mode_t *u) {
650c7a2e	11	umask(*u & 0777);
affb60b1 LP	12	}
	13
	14	#define _cleanup_umask_ _cleanup_(umaskp)
	15
650c7a2e LP	16	/* We make use of the fact here that the umask() concept is using only the lower 9 bits of mode_t, although
	17	* mode_t has space for the file type in the bits further up. We simply OR in the file type mask S_IFMT to
	18	* distinguish the first and the second iteration of the RUN_WITH_UMASK() loop, so that we can run the first
	19	* one, and exit on the second. */
affb60b1	20
650c7a2e	21	assert_cc((S_IFMT & 0777) == 0);
affb60b1 LP	22
affb60b1 LP	23	#define RUN_WITH_UMASK(mask) \
650c7a2e LP	24	for (_cleanup_umask_ mode_t _saved_umask_ = umask(mask) \| S_IFMT; \
	25	FLAGS_SET(_saved_umask_, S_IFMT); \
	26	_saved_umask_ &= 0777)