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* lsyncd.h Live (Mirror) Syncing Demon
* Interface between the core modules.
* License: GPLv2 (see COPYING) or any later version
* Authors: Axel Kittenberger <>
#ifndef LSYNCD_H
#define LSYNCD_H
// some older machines need this to see pselect
#define _BSD_SOURCE 1
#define _XOPEN_SOURCE 700
#define _DARWIN_C_SOURCE 1
// includes needed for headerfile
#include "config.h"
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <lua.h>
#define LSYNCD_LIBNAME "lsyncd"
* Lsyncd runtime configuration
extern struct settings {
char * log_file; // If not NULL Lsyncd logs into this file.
bool log_syslog; // If true Lsyncd sends log messages to syslog
char * log_ident; // If not NULL the syslog identity (otherwise "Lsyncd")
int log_facility; // The syslog facility
int log_level; // -1 logs everything, 0 normal mode, LOG_ERROR errors only.
bool nodaemon; // True if Lsyncd shall not daemonize.
char * pidfile; // If not NULL Lsyncd writes its pid into this file.
} settings;
* time comparisons - wrap around safe
#define time_after(a,b) ((long)(b) - (long)(a) < 0)
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)
// returns (on Lua stack) the current kernels * clock state (jiffies)
extern int l_now(lua_State *L);
// pushes a runner function and the runner error handler onto Lua stack
extern void load_runner_func(lua_State *L, const char *name);
// set to 1 on hup signal or term signal
extern volatile sig_atomic_t hup;
extern volatile sig_atomic_t term;
* wrappers for heap management, they exit if out-of-memory.
extern void * s_calloc(size_t nmemb, size_t size);
extern void * s_malloc(size_t size);
extern void * s_realloc(void *ptr, size_t size);
extern char * s_strdup(const char *src);
* Logging
// Returns the positive priority if name is configured to be logged, or -1
extern int check_logcat(const char *name);
// logs a string
#define logstring(cat, message) \
{int p; if ((p = check_logcat(cat)) <= settings.log_level) \
{logstring0(p, cat, message);}}
extern void logstring0(int priority, const char *cat, const char *message);
// logs a formated string
#define printlogf(L, cat, ...) \
{int p; if ((p = check_logcat(cat)) <= settings.log_level) \
{printlogf0(L, p, cat, __VA_ARGS__);}}
extern void
printlogf0(lua_State *L,
int priority,
const char *cat,
const char *fmt,
__attribute__((format(printf, 4, 5)));
* File-descriptor helpers
// Sets the non-blocking flag for a file descriptor.
extern void non_block_fd(int fd);
// Sets the close-on-exit flag for a file descriptor.
extern void close_exec_fd(int fd);
* An observance to be called when a file descritor becomes
* read-ready or write-ready.
struct observance {
// The file descriptor to observe.
int fd;
// Function to call when read becomes ready.
void (*ready)(lua_State *, struct observance *);
// Function to call when write becomes ready.
void (*writey)(lua_State *, struct observance *);
// Function to call to clean up
void (*tidy)(struct observance *);
// Extra tokens to pass to the functions.
void *extra;
// makes the core observe a file descriptor
extern void observe_fd(
int fd,
void (*ready) (lua_State *, struct observance *),
void (*writey)(lua_State *, struct observance *),
void (*tidy) (struct observance *),
void *extra
// stops the core to observe a file descriptor
extern void nonobserve_fd(int fd);
* inotify
extern void register_inotify(lua_State *L);
extern void open_inotify(lua_State *L);
* fanotify
extern void register_fanotify(lua_State *L);
extern void open_fanotify(lua_State *L);
* /dev/fsevents
extern void open_fsevents(lua_State *L);
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