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common: Add an info callback to dotlock.

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* common/dotlock.h (enum dotlock_reasons): New.
(DOTLOCK_PREPARE_CREATE): New flag.
* common/dotlock.c (struct dotlock_handle): Add info_cb and
info_cb_value.
(dotlock_create): Support the new flag.
(dotlock_finish_create): New.
(read_lockfile): Silence in case of ENOENT.
(dotlock_set_info_cb): New.  Use callback after all error and info
messages.
(dotlock_take_unix, dotlock_take_w32): Allow termination by callback.
This commit is contained in:
Werner Koch 2023-12-13 10:08:12 +01:00
parent f57717bf23
commit 937aeb1904
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GPG key ID: E3FDFF218E45B72B
3 changed files with 203 additions and 11 deletions
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20
common/dotlock.h
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@ -97,12 +97,32 @@ extern "C"
struct dotlock_handle;
typedef struct dotlock_handle *dotlock_t;
enum dotlock_reasons
{
DOTLOCK_CONFIG_TEST, /* Can't check system - function terminates. */
DOTLOCK_FILE_ERROR, /* General file error - function terminates. */
DOTLOCK_INV_FILE, /* Invalid file - function terminates. */
DOTLOCK_CONFLICT, /* Something is wrong - function terminates. */
DOTLOCK_NOT_LOCKED, /* Not locked - No action required. */
DOTLOCK_STALE_REMOVED, /* Stale lock file was removed - retrying. */
DOTLOCK_WAITING /* Waiting for the lock - may be terminated. */
};
#define DOTLOCK_PREPARE_CREATE (1<<5) /* Require dotlock_finish_create. */
void dotlock_disable (void);
dotlock_t dotlock_create (const char *file_to_lock, unsigned int flags);
dotlock_t dotlock_finish_create (dotlock_t h, const char *file_to_lock);
void dotlock_set_fd (dotlock_t h, int fd);
int dotlock_get_fd (dotlock_t h);
void dotlock_set_info_cb (dotlock_t h,
int (*cb)(dotlock_t, void *,
enum dotlock_reasons reason,
const char *,...),
void *opaque);
void dotlock_destroy (dotlock_t h);
int dotlock_take (dotlock_t h, long timeout);
int dotlock_is_locked (dotlock_t h);
int dotlock_release (dotlock_t h);
void dotlock_remove_lockfiles (void);