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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <fcntl.h>
/* Include here so consumers have LOCK_{EX,SH,NB} available. */
#include <sys/file.h>
typedef struct LockFile {
int dir_fd;
char *path;
int fd;
int operation;
} LockFile;
int make_lock_file_at(int dir_fd, const char *p, int operation, LockFile *ret);
static inline int make_lock_file(const char *p, int operation, LockFile *ret) {
return make_lock_file_at(AT_FDCWD, p, operation, ret);
}
int make_lock_file_for(const char *p, int operation, LockFile *ret);
void release_lock_file(LockFile *f);
#define LOCK_FILE_INIT (LockFile) { .dir_fd = -EBADF, .fd = -EBADF }
/* POSIX locks with the same interface as flock(). */
int posix_lock(int fd, int operation);
void posix_unlockpp(int **fd);
#define CLEANUP_POSIX_UNLOCK(fd) \
_cleanup_(posix_unlockpp) _unused_ int *CONCATENATE(_cleanup_posix_unlock_, UNIQ) = &(fd)
/* Open File Description locks with the same interface as flock(). */
int unposix_lock(int fd, int operation);
void unposix_unlockpp(int **fd);
#define CLEANUP_UNPOSIX_UNLOCK(fd) \
_cleanup_(unposix_unlockpp) _unused_ int *CONCATENATE(_cleanup_unposix_unlock_, UNIQ) = &(fd)
typedef enum LockType {
LOCK_NONE, /* Don't lock the file descriptor. Useful if you need to conditionally lock a file. */
LOCK_BSD,
LOCK_POSIX,
LOCK_UNPOSIX,
} LockType;
int lock_generic(int fd, LockType type, int operation);
int lock_generic_with_timeout(int fd, LockType type, int operation, usec_t timeout);
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