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common: Enhance dotlock, so that we can have a CLI util.

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* common/dotlock.h (DOTLOCK_LOCK_BY_PARENT, DOTLOCK_LOCKED): New.
* common/dotlock.c [HAVE_POSIX_SYSTEM]: Include <dirent.h>.
(dotlock_get_process_id, dotlock_detect_tname): New.
(dotlock_create_unix): Handle the case when no_write option is
specified.  Not creating the lock file, but detect the the file of
tname.
(dotlock_create) [HAVE_POSIX_SYSTEM]: Add support of
DOTLOCK_LOCK_BY_PARENT and DOTLOCK_LOCKED for dotlock CLI util.
(dotlock_take_unix): Support the case of DOTLOCK_LOCK_BY_PARENT.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2023-12-19 15:59:41 +09:00
parent 1c5584c395
commit 6b4fd3a5da
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GPG key ID: 640114AF89DE6054
2 changed files with 138 additions and 11 deletions
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common/dotlock.h
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@ -108,7 +108,10 @@ enum dotlock_reasons
DOTLOCK_WAITING /* Waiting for the lock - may be terminated. */
};
#define DOTLOCK_PREPARE_CREATE (1<<5) /* Require dotlock_finish_create. */
/* Flags for dotlock_create. */
#define DOTLOCK_PREPARE_CREATE (1U << 5) /* Require dotlock_finish_create. */
#define DOTLOCK_LOCK_BY_PARENT (1U << 6) /* Used by dotlock util. */
#define DOTLOCK_LOCKED (1U << 7) /* Used by dotlock util. */
void dotlock_disable (void);
dotlock_t dotlock_create (const char *file_to_lock, unsigned int flags);