mirror of
https://github.com/morgan9e/systemd
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cb1b813f0d
When adding unprivileged nspawn support we don't really want a global lock file, since we cannot even access the dir they are stored in, hence make the concept optional. Some minor other modernizations.
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <fcntl.h>
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typedef struct LockFile {
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int dir_fd;
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char *path;
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int fd;
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int operation;
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} LockFile;
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int make_lock_file_at(int dir_fd, const char *p, int operation, LockFile *ret);
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static inline int make_lock_file(const char *p, int operation, LockFile *ret) {
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return make_lock_file_at(AT_FDCWD, p, operation, ret);
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}
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int make_lock_file_for(const char *p, int operation, LockFile *ret);
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void release_lock_file(LockFile *f);
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#define LOCK_FILE_INIT (LockFile) { .dir_fd = -EBADF, .fd = -EBADF }
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/* POSIX locks with the same interface as flock(). */
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int posix_lock(int fd, int operation);
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void posix_unlockpp(int **fd);
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#define CLEANUP_POSIX_UNLOCK(fd) \
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_cleanup_(posix_unlockpp) _unused_ int *CONCATENATE(_cleanup_posix_unlock_, UNIQ) = &(fd)
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/* Open File Description locks with the same interface as flock(). */
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int unposix_lock(int fd, int operation);
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void unposix_unlockpp(int **fd);
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#define CLEANUP_UNPOSIX_UNLOCK(fd) \
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_cleanup_(unposix_unlockpp) _unused_ int *CONCATENATE(_cleanup_unposix_unlock_, UNIQ) = &(fd)
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typedef enum LockType {
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LOCK_NONE, /* Don't lock the file descriptor. Useful if you need to conditionally lock a file. */
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LOCK_BSD,
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LOCK_POSIX,
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LOCK_UNPOSIX,
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} LockType;
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int lock_generic(int fd, LockType type, int operation);
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int lock_generic_with_timeout(int fd, LockType type, int operation, usec_t timeout);
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