1 files changed, 45 insertions, 0 deletions
diff --git a/src/basic/lock-util.h b/src/basic/lock-util.h
new file mode 100644
index 0000000..91b332f
--- /dev/null
+++ b/src/basic/lock-util.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <fcntl.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 { .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);