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#ifndef FSMONITOR_DAEMON_H
#define FSMONITOR_DAEMON_H

#ifdef HAVE_FSMONITOR_DAEMON_BACKEND

#include "cache.h"
#include "dir.h"
#include "run-command.h"
#include "simple-ipc.h"
#include "thread-utils.h"

struct fsmonitor_batch;
struct fsmonitor_token_data;

struct fsmonitor_daemon_backend_data; /* opaque platform-specific data */

struct fsmonitor_daemon_state {
	pthread_t listener_thread;
	pthread_mutex_t main_lock;

	struct strbuf path_worktree_watch;
	struct strbuf path_gitdir_watch;
	int nr_paths_watching;

	struct fsmonitor_token_data *current_token_data;

	int error_code;
	struct fsmonitor_daemon_backend_data *backend_data;

	struct ipc_server_data *ipc_server_data;
};

/*
 * Pathname classifications.
 *
 * The daemon classifies the pathnames that it receives from file
 * system notification events into the following categories and uses
 * that to decide whether clients are told about them.  (And to watch
 * for file system synchronization events.)
 *
 * The client should only care about paths within the working
 * directory proper (inside the working directory and not ".git" nor
 * inside of ".git/").  That is, the client has read the index and is
 * asking for a list of any paths in the working directory that have
 * been modified since the last token.  The client does not care about
 * file system changes within the .git directory (such as new loose
 * objects or packfiles).  So the client will only receive paths that
 * are classified as IS_WORKDIR_PATH.
 *
 * The daemon uses the IS_DOT_GIT and IS_GITDIR internally to mean the
 * exact ".git" directory or GITDIR.  If the daemon receives a delete
 * event for either of these directories, it will automatically
 * shutdown, for example.
 *
 * Note that the daemon DOES NOT explicitly watch nor special case the
 * ".git/index" file.  The daemon does not read the index and does not
 * have any internal index-relative state.  The daemon only collects
 * the set of modified paths within the working directory.
 */
enum fsmonitor_path_type {
	IS_WORKDIR_PATH = 0,

	IS_DOT_GIT,
	IS_INSIDE_DOT_GIT,
	IS_INSIDE_DOT_GIT_WITH_COOKIE_PREFIX,

	IS_GITDIR,
	IS_INSIDE_GITDIR,
	IS_INSIDE_GITDIR_WITH_COOKIE_PREFIX,

	IS_OUTSIDE_CONE,
};

/*
 * Classify a pathname relative to the root of the working directory.
 */
enum fsmonitor_path_type fsmonitor_classify_path_workdir_relative(
	const char *relative_path);

/*
 * Classify a pathname relative to a <gitdir> that is external to the
 * worktree directory.
 */
enum fsmonitor_path_type fsmonitor_classify_path_gitdir_relative(
	const char *relative_path);

/*
 * Classify an absolute pathname received from a filesystem event.
 */
enum fsmonitor_path_type fsmonitor_classify_path_absolute(
	struct fsmonitor_daemon_state *state,
	const char *path);

#endif /* HAVE_FSMONITOR_DAEMON_BACKEND */
#endif /* FSMONITOR_DAEMON_H */
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