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lite-xl/lib/dmon/dmon.h

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#ifndef __DMON_H__
#define __DMON_H__
//
// Copyright 2021 Sepehr Taghdisian (septag@github). All rights reserved.
// License: https://github.com/septag/dmon#license-bsd-2-clause
//
// Portable directory monitoring library
// watches directories for file or directory changes.
//
// Usage:
// define DMON_IMPL and include this file to use it:
// #define DMON_IMPL
// #include "dmon.h"
//
// dmon_init():
// Call this once at the start of your program.
// This will start a low-priority monitoring thread
// dmon_deinit():
// Call this when your work with dmon is finished, usually on program terminate
// This will free resources and stop the monitoring thread
// dmon_watch:
// Watch for directories
// You can watch multiple directories by calling this function multiple times
// rootdir: root directory to monitor
// watch_cb: callback function to receive events.
// NOTE that this function is called from another thread, so you should
// beware of data races in your application when accessing data within this
// callback
// flags: watch flags, see dmon_watch_flags_t
// user_data: user pointer that is passed to callback function
// Returns the Id of the watched directory after successful call, or returns Id=0 if error
// dmon_unwatch:
// Remove the directory from watch list
//
// see test.c for the basic example
//
// Configuration:
// You can customize some low-level functionality like malloc and logging by overriding macros:
//
// DMON_MALLOC, DMON_FREE, DMON_REALLOC:
// define these macros to override memory allocations
// default is 'malloc', 'free' and 'realloc'
// DMON_ASSERT:
// define this to provide your own assert
// default is 'assert'
// DMON_LOG_DEBUG
// define this to provide your own extra debug logging mechanism
// default implementation logs to stdout in DEBUG and does nothing in other builds
// DMON_API_DECL, DMON_API_IMPL
// define these to provide your own API declerations. (for example: static)
// default is nothing (which is extern in C language )
// DMON_MAX_PATH
// Maximum size of path characters
// default is 260 characters
// DMON_MAX_WATCHES
// Maximum number of watch directories
// default is 64
//
// TODO:
// - DMON_WATCHFLAGS_FOLLOW_SYMLINKS does not resolve files
// - implement DMON_WATCHFLAGS_OUTOFSCOPE_LINKS
// - implement DMON_WATCHFLAGS_IGNORE_DIRECTORIES
//
// History:
// 1.0.0 First version. working Win32/Linux backends
// 1.1.0 MacOS backend
// 1.1.1 Minor fixes, eliminate gcc/clang warnings with -Wall
// 1.1.2 Eliminate some win32 dead code
// 1.1.3 Fixed select not resetting causing high cpu usage on linux
// 1.2.1 inotify (linux) fixes and improvements, added extra functionality header for linux
// to manually add/remove directories manually to the watch handle, in case of large file sets
//
#include <stdbool.h>
#include <stdint.h>
#ifndef DMON_API_DECL
# define DMON_API_DECL
#endif
#ifndef DMON_API_IMPL
# define DMON_API_IMPL
#endif
typedef struct { uint32_t id; } dmon_watch_id;
// Pass these flags to `dmon_watch`
typedef enum dmon_watch_flags_t {
DMON_WATCHFLAGS_RECURSIVE = 0x1, // monitor all child directories
DMON_WATCHFLAGS_FOLLOW_SYMLINKS = 0x2, // resolve symlinks (linux only)
DMON_WATCHFLAGS_OUTOFSCOPE_LINKS = 0x4, // TODO: not implemented yet
DMON_WATCHFLAGS_IGNORE_DIRECTORIES = 0x8 // TODO: not implemented yet
} dmon_watch_flags;
// Action is what operation performed on the file. this value is provided by watch callback
typedef enum dmon_action_t {
DMON_ACTION_CREATE = 1,
DMON_ACTION_DELETE,
DMON_ACTION_MODIFY,
DMON_ACTION_MOVE
} dmon_action;
typedef enum dmon_error_enum {
DMON_SUCCESS = 0,
DMON_ERROR_WATCH_DIR,
DMON_ERROR_OPEN_DIR,
DMON_ERROR_MONITOR_FAIL,
DMON_ERROR_UNSUPPORTED_SYMLINK,
DMON_ERROR_SUBDIR_LOCATION,
DMON_ERROR_END
} dmon_error;
#ifdef __cplusplus
extern "C" {
#endif
DMON_API_DECL const char *dmon_error_str(dmon_error err);
DMON_API_DECL void dmon_init(void);
DMON_API_DECL void dmon_deinit(void);
DMON_API_DECL dmon_watch_id dmon_watch(const char* rootdir,
void (*watch_cb)(dmon_watch_id watch_id, dmon_action action,
const char* rootdir, const char* filepath,
const char* oldfilepath, void* user),
uint32_t flags, void* user_data, dmon_error *error_code);
DMON_API_DECL void dmon_unwatch(dmon_watch_id id);
#ifdef __cplusplus
}
#endif
#ifdef DMON_IMPL
#define DMON_OS_WINDOWS 0
#define DMON_OS_MACOS 0
#define DMON_OS_LINUX 0
#if defined(_WIN32) || defined(_WIN64)
# undef DMON_OS_WINDOWS
# define DMON_OS_WINDOWS 1
#elif defined(__linux__)
# undef DMON_OS_LINUX
# define DMON_OS_LINUX 1
#elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
# undef DMON_OS_MACOS
# define DMON_OS_MACOS __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
#else
# define DMON_OS 0
# error "unsupported platform"
#endif
#if DMON_OS_WINDOWS
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# ifndef NOMINMAX
# define NOMINMAX
# endif
# include <windows.h>
#elif DMON_OS_LINUX
# ifndef __USE_MISC
# define __USE_MISC
# endif
# include <dirent.h>
# include <errno.h>
# include <fcntl.h>
# include <linux/limits.h>
# include <pthread.h>
# include <sys/inotify.h>
# include <sys/stat.h>
# include <sys/time.h>
# include <time.h>
# include <unistd.h>
# include <stdlib.h>
/* Recursive removed for Lite XL when using inotify. */
# define LITE_XL_DISABLE_INOTIFY_RECURSIVE
# define DMON_LOG_DEBUG(s)
#elif DMON_OS_MACOS
# include <pthread.h>
# include <CoreServices/CoreServices.h>
# include <sys/time.h>
# include <sys/stat.h>
# include <dispatch/dispatch.h>
#endif
#ifndef DMON_MALLOC
# include <stdlib.h>
# define DMON_MALLOC(size) malloc(size)
# define DMON_FREE(ptr) free(ptr)
# define DMON_REALLOC(ptr, size) realloc(ptr, size)
#endif
#ifndef DMON_ASSERT
# include <assert.h>
# define DMON_ASSERT(e) assert(e)
#endif
#ifndef DMON_LOG_DEBUG
# ifndef NDEBUG
# include <stdio.h>
# define DMON_LOG_DEBUG(s) do { puts(s); } while(0)
# else
# define DMON_LOG_DEBUG(s)
# endif
#endif
#ifndef DMON_MAX_WATCHES
# define DMON_MAX_WATCHES 64
#endif
#ifndef DMON_MAX_PATH
# define DMON_MAX_PATH 260
#endif
#define _DMON_UNUSED(x) (void)(x)
#ifndef _DMON_PRIVATE
# if defined(__GNUC__) || defined(__clang__)
# define _DMON_PRIVATE __attribute__((unused)) static
# else
# define _DMON_PRIVATE static
# endif
#endif
#include <string.h>
#ifndef _DMON_LOG_DEBUGF
# define _DMON_LOG_DEBUGF(str, ...) do { char msg[512]; snprintf(msg, sizeof(msg), str, __VA_ARGS__); DMON_LOG_DEBUG(msg); } while(0);
#endif
#ifndef dmon__min
# define dmon__min(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef dmon__max
# define dmon__max(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef dmon__swap
# define dmon__swap(a, b, _type) \
do { \
_type tmp = a; \
a = b; \
b = tmp; \
} while (0)
#endif
#ifndef dmon__make_id
# ifdef __cplusplus
# define dmon__make_id(id) {id}
# else
# define dmon__make_id(id) (dmon_watch_id) {id}
# endif
#endif // dmon__make_id
_DMON_PRIVATE bool dmon__isrange(char ch, char from, char to)
{
return (uint8_t)(ch - from) <= (uint8_t)(to - from);
}
_DMON_PRIVATE bool dmon__isupperchar(char ch)
{
return dmon__isrange(ch, 'A', 'Z');
}
_DMON_PRIVATE char dmon__tolowerchar(char ch)
{
return ch + (dmon__isupperchar(ch) ? 0x20 : 0);
}
_DMON_PRIVATE char* dmon__tolower(char* dst, int dst_sz, const char* str)
{
int offset = 0;
int dst_max = dst_sz - 1;
while (*str && offset < dst_max) {
dst[offset++] = dmon__tolowerchar(*str);
++str;
}
dst[offset] = '\0';
return dst;
}
_DMON_PRIVATE char* dmon__strcpy(char* dst, int dst_sz, const char* src)
{
DMON_ASSERT(dst);
DMON_ASSERT(src);
const int32_t len = (int32_t)strlen(src);
const int32_t _max = dst_sz - 1;
const int32_t num = (len < _max ? len : _max);
memcpy(dst, src, num);
dst[num] = '\0';
return dst;
}
_DMON_PRIVATE char* dmon__unixpath(char* dst, int size, const char* path)
{
size_t len = strlen(path);
len = dmon__min(len, (size_t)size - 1);
for (size_t i = 0; i < len; i++) {
if (path[i] != '\\')
dst[i] = path[i];
else
dst[i] = '/';
}
dst[len] = '\0';
return dst;
}
#if DMON_OS_LINUX || DMON_OS_MACOS
_DMON_PRIVATE char* dmon__strcat(char* dst, int dst_sz, const char* src)
{
int len = (int)strlen(dst);
return dmon__strcpy(dst + len, dst_sz - len, src);
}
#endif // DMON_OS_LINUX || DMON_OS_MACOS
// stretchy buffer: https://github.com/nothings/stb/blob/master/stretchy_buffer.h
#define stb_sb_free(a) ((a) ? DMON_FREE(stb__sbraw(a)),0 : 0)
#define stb_sb_push(a,v) (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
#define stb_sb_pop(a) (stb__sbn(a)--)
#define stb_sb_count(a) ((a) ? stb__sbn(a) : 0)
#define stb_sb_add(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
#define stb_sb_last(a) ((a)[stb__sbn(a)-1])
#define stb_sb_reset(a) ((a) ? (stb__sbn(a) = 0) : 0)
#define stb__sbraw(a) ((int *) (a) - 2)
#define stb__sbm(a) stb__sbraw(a)[0]
#define stb__sbn(a) stb__sbraw(a)[1]
#define stb__sbneedgrow(a,n) ((a)==0 || stb__sbn(a)+(n) >= stb__sbm(a))
#define stb__sbmaybegrow(a,n) (stb__sbneedgrow(a,(n)) ? stb__sbgrow(a,n) : 0)
#define stb__sbgrow(a,n) (*((void **)&(a)) = stb__sbgrowf((a), (n), sizeof(*(a))))
static void * stb__sbgrowf(void *arr, int increment, int itemsize)
{
int dbl_cur = arr ? 2*stb__sbm(arr) : 0;
int min_needed = stb_sb_count(arr) + increment;
int m = dbl_cur > min_needed ? dbl_cur : min_needed;
int *p = (int *) DMON_REALLOC(arr ? stb__sbraw(arr) : 0, itemsize * m + sizeof(int)*2);
if (p) {
if (!arr)
p[1] = 0;
p[0] = m;
return p+2;
} else {
return (void *) (2*sizeof(int)); // try to force a NULL pointer exception later
}
}
// watcher callback (same as dmon.h's decleration)
typedef void (dmon__watch_cb)(dmon_watch_id, dmon_action, const char*, const char*, const char*, void*);
static const char *dmon__errors[] = {
"Success",
"Error watching directory",
"Error opening directory",
"Error enabling monitoring",
"Error support for symlink disabled",
"Error not a subdirectory",
};
DMON_API_IMPL const char *dmon_error_str(dmon_error err) {
DMON_ASSERT(err >= 0 && err < DMON_ERROR_END);
return dmon__errors[(int) err];
}
#if DMON_OS_WINDOWS
// IOCP (windows)
#ifdef UNICODE
# define _DMON_WINAPI_STR(name, size) wchar_t _##name[size]; MultiByteToWideChar(CP_UTF8, 0, name, -1, _##name, size)
#else
# define _DMON_WINAPI_STR(name, size) const char* _##name = name
#endif
typedef struct dmon__win32_event {
char filepath[DMON_MAX_PATH];
DWORD action;
dmon_watch_id watch_id;
bool skip;
} dmon__win32_event;
typedef struct dmon__watch_state {
dmon_watch_id id;
OVERLAPPED overlapped;
HANDLE dir_handle;
uint8_t buffer[64512]; // http://msdn.microsoft.com/en-us/library/windows/desktop/aa365465(v=vs.85).aspx
DWORD notify_filter;
dmon__watch_cb* watch_cb;
uint32_t watch_flags;
void* user_data;
char rootdir[DMON_MAX_PATH];
char old_filepath[DMON_MAX_PATH];
} dmon__watch_state;
typedef struct dmon__state {
int num_watches;
dmon__watch_state watches[DMON_MAX_WATCHES];
HANDLE thread_handle;
CRITICAL_SECTION mutex;
volatile int modify_watches;
CRITICAL_SECTION modify_watches_mutex;
dmon__win32_event* events;
bool quit;
HANDLE wake_event;
} dmon__state;
static bool _dmon_init;
static dmon__state _dmon;
_DMON_PRIVATE bool dmon__refresh_watch(dmon__watch_state* watch)
{
return ReadDirectoryChangesW(watch->dir_handle, watch->buffer, sizeof(watch->buffer),
(watch->watch_flags & DMON_WATCHFLAGS_RECURSIVE) ? TRUE : FALSE,
watch->notify_filter, NULL, &watch->overlapped, NULL) != 0;
}
_DMON_PRIVATE void dmon__unwatch(dmon__watch_state* watch)
{
CancelIo(watch->dir_handle);
CloseHandle(watch->overlapped.hEvent);
CloseHandle(watch->dir_handle);
memset(watch, 0x0, sizeof(dmon__watch_state));
}
_DMON_PRIVATE void dmon__win32_process_events(void)
{
for (int i = 0, c = stb_sb_count(_dmon.events); i < c; i++) {
dmon__win32_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
if (ev->action == FILE_ACTION_MODIFIED || ev->action == FILE_ACTION_ADDED) {
// remove duplicate modifies on a single file
for (int j = i + 1; j < c; j++) {
dmon__win32_event* check_ev = &_dmon.events[j];
if (check_ev->action == FILE_ACTION_MODIFIED &&
strcmp(ev->filepath, check_ev->filepath) == 0) {
check_ev->skip = true;
}
}
}
}
// trigger user callbacks
for (int i = 0, c = stb_sb_count(_dmon.events); i < c; i++) {
dmon__win32_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
dmon__watch_state* watch = &_dmon.watches[ev->watch_id.id - 1];
if(watch == NULL || watch->watch_cb == NULL) {
continue;
}
switch (ev->action) {
case FILE_ACTION_ADDED:
watch->watch_cb(ev->watch_id, DMON_ACTION_CREATE, watch->rootdir, ev->filepath, NULL,
watch->user_data);
break;
case FILE_ACTION_MODIFIED:
watch->watch_cb(ev->watch_id, DMON_ACTION_MODIFY, watch->rootdir, ev->filepath, NULL,
watch->user_data);
break;
case FILE_ACTION_RENAMED_OLD_NAME: {
// find the first occurance of the NEW_NAME
// this is somewhat API flaw that we have no reference for relating old and new files
for (int j = i + 1; j < c; j++) {
dmon__win32_event* check_ev = &_dmon.events[j];
if (check_ev->action == FILE_ACTION_RENAMED_NEW_NAME) {
watch->watch_cb(check_ev->watch_id, DMON_ACTION_MOVE, watch->rootdir,
check_ev->filepath, ev->filepath, watch->user_data);
break;
}
}
} break;
case FILE_ACTION_REMOVED:
watch->watch_cb(ev->watch_id, DMON_ACTION_DELETE, watch->rootdir, ev->filepath, NULL,
watch->user_data);
break;
}
}
stb_sb_reset(_dmon.events);
}
static int dmon__safe_get_modify_watches() {
EnterCriticalSection(&_dmon.modify_watches_mutex);
const int value = _dmon.modify_watches;
LeaveCriticalSection(&_dmon.modify_watches_mutex);
return value;
}
_DMON_PRIVATE DWORD WINAPI dmon__thread(LPVOID arg)
{
_DMON_UNUSED(arg);
HANDLE wait_handles[DMON_MAX_WATCHES + 1];
SYSTEMTIME starttm;
GetSystemTime(&starttm);
uint64_t msecs_elapsed = 0;
while (!_dmon.quit) {
if (dmon__safe_get_modify_watches() ||
!TryEnterCriticalSection(&_dmon.mutex)) {
Sleep(10);
continue;
}
if (_dmon.num_watches == 0) {
Sleep(10);
LeaveCriticalSection(&_dmon.mutex);
continue;
}
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__watch_state* watch = &_dmon.watches[i];
wait_handles[i] = watch->overlapped.hEvent;
}
const int n = _dmon.num_watches;
wait_handles[n] = _dmon.wake_event;
const int n_pending = stb_sb_count(_dmon.events);
DWORD wait_result = WaitForMultipleObjects(n + 1, wait_handles, FALSE, n_pending > 0 ? 10 : INFINITE);
// NOTE: maybe we should check for WAIT_ABANDONED_<n> values if that can happen.
if (wait_result >= WAIT_OBJECT_0 && wait_result < WAIT_OBJECT_0 + n) {
dmon__watch_state* watch = &_dmon.watches[wait_result - WAIT_OBJECT_0];
DWORD bytes;
if (HasOverlappedIoCompleted(&watch->overlapped) &&
GetOverlappedResult(watch->dir_handle, &watch->overlapped, &bytes, FALSE)) {
char filepath[DMON_MAX_PATH];
PFILE_NOTIFY_INFORMATION notify;
size_t offset = 0;
if (bytes == 0) {
dmon__refresh_watch(watch);
LeaveCriticalSection(&_dmon.mutex);
continue;
}
do {
notify = (PFILE_NOTIFY_INFORMATION)&watch->buffer[offset];
int count = WideCharToMultiByte(CP_UTF8, 0, notify->FileName,
notify->FileNameLength / sizeof(WCHAR),
filepath, DMON_MAX_PATH - 1, NULL, NULL);
filepath[count] = TEXT('\0');
dmon__unixpath(filepath, sizeof(filepath), filepath);
// TODO: ignore directories if flag is set
if (stb_sb_count(_dmon.events) == 0) {
msecs_elapsed = 0;
}
dmon__win32_event wev = { { 0 }, notify->Action, watch->id, false };
dmon__strcpy(wev.filepath, sizeof(wev.filepath), filepath);
stb_sb_push(_dmon.events, wev);
offset += notify->NextEntryOffset;
} while (notify->NextEntryOffset > 0);
if (!_dmon.quit) {
dmon__refresh_watch(watch);
}
}
} // if (WaitForMultipleObjects)
SYSTEMTIME tm;
GetSystemTime(&tm);
LONG dt =
(tm.wSecond - starttm.wSecond) * 1000 + (tm.wMilliseconds - starttm.wMilliseconds);
starttm = tm;
msecs_elapsed += dt;
if (msecs_elapsed > 100 && stb_sb_count(_dmon.events) > 0) {
dmon__win32_process_events();
msecs_elapsed = 0;
}
LeaveCriticalSection(&_dmon.mutex);
}
return 0;
}
DMON_API_IMPL void dmon_init(void)
{
DMON_ASSERT(!_dmon_init);
InitializeCriticalSection(&_dmon.mutex);
InitializeCriticalSection(&_dmon.modify_watches_mutex);
_dmon.thread_handle =
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)dmon__thread, NULL, 0, NULL);
_dmon.wake_event = CreateEvent(NULL, FALSE, FALSE, NULL);
DMON_ASSERT(_dmon.thread_handle);
_dmon_init = true;
}
static void dmon__enter_critical_wakeup(void) {
EnterCriticalSection(&_dmon.modify_watches_mutex);
_dmon.modify_watches = 1;
if (TryEnterCriticalSection(&_dmon.mutex) == 0) {
SetEvent(_dmon.wake_event);
EnterCriticalSection(&_dmon.mutex);
}
LeaveCriticalSection(&_dmon.modify_watches_mutex);
}
static void dmon__leave_critical_wakeup(void) {
EnterCriticalSection(&_dmon.modify_watches_mutex);
_dmon.modify_watches = 0;
LeaveCriticalSection(&_dmon.modify_watches_mutex);
LeaveCriticalSection(&_dmon.mutex);
}
DMON_API_IMPL void dmon_deinit(void)
{
DMON_ASSERT(_dmon_init);
_dmon.quit = true;
dmon__enter_critical_wakeup();
if (_dmon.thread_handle != INVALID_HANDLE_VALUE) {
WaitForSingleObject(_dmon.thread_handle, INFINITE);
CloseHandle(_dmon.thread_handle);
}
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__unwatch(&_dmon.watches[i]);
}
dmon__leave_critical_wakeup();
DeleteCriticalSection(&_dmon.mutex);
DeleteCriticalSection(&_dmon.modify_watches_mutex);
stb_sb_free(_dmon.events);
_dmon_init = false;
}
DMON_API_IMPL dmon_watch_id dmon_watch(const char* rootdir,
void (*watch_cb)(dmon_watch_id watch_id, dmon_action action,
const char* dirname, const char* filename,
const char* oldname, void* user),
uint32_t flags, void* user_data, dmon_error *error_code)
{
DMON_ASSERT(watch_cb);
DMON_ASSERT(rootdir && rootdir[0]);
dmon__enter_critical_wakeup();
DMON_ASSERT(_dmon.num_watches < DMON_MAX_WATCHES);
uint32_t id = ++_dmon.num_watches;
dmon__watch_state* watch = &_dmon.watches[id - 1];
watch->id = dmon__make_id(id);
watch->watch_flags = flags;
watch->watch_cb = watch_cb;
watch->user_data = user_data;
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, rootdir);
dmon__unixpath(watch->rootdir, sizeof(watch->rootdir), rootdir);
size_t rootdir_len = strlen(watch->rootdir);
if (watch->rootdir[rootdir_len - 1] != '/') {
watch->rootdir[rootdir_len] = '/';
watch->rootdir[rootdir_len + 1] = '\0';
}
_DMON_WINAPI_STR(rootdir, DMON_MAX_PATH);
watch->dir_handle =
CreateFile(_rootdir, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
if (watch->dir_handle != INVALID_HANDLE_VALUE) {
watch->notify_filter = FILE_NOTIFY_CHANGE_CREATION | FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_SIZE;
watch->overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (watch->overlapped.hEvent == INVALID_HANDLE_VALUE ||
!dmon__refresh_watch(watch)) {
dmon__unwatch(watch);
*error_code = DMON_ERROR_WATCH_DIR;
dmon__leave_critical_wakeup();
return dmon__make_id(0);
}
} else {
*error_code = DMON_ERROR_OPEN_DIR;
dmon__leave_critical_wakeup();
return dmon__make_id(0);
}
dmon__leave_critical_wakeup();
return dmon__make_id(id);
}
DMON_API_IMPL void dmon_unwatch(dmon_watch_id id)
{
DMON_ASSERT(id.id > 0);
dmon__enter_critical_wakeup();
int index = id.id - 1;
DMON_ASSERT(index < _dmon.num_watches);
dmon__unwatch(&_dmon.watches[index]);
if (index != _dmon.num_watches - 1) {
dmon__swap(_dmon.watches[index], _dmon.watches[_dmon.num_watches - 1], dmon__watch_state);
}
--_dmon.num_watches;
dmon__leave_critical_wakeup();
}
#elif DMON_OS_LINUX
// inotify linux backend
#define _DMON_TEMP_BUFFSIZE ((sizeof(struct inotify_event) + PATH_MAX) * 1024)
typedef struct dmon__watch_subdir {
char rootdir[DMON_MAX_PATH];
} dmon__watch_subdir;
typedef struct dmon__inotify_event {
char filepath[DMON_MAX_PATH];
uint32_t mask;
uint32_t cookie;
dmon_watch_id watch_id;
bool skip;
} dmon__inotify_event;
typedef struct dmon__watch_state {
dmon_watch_id id;
int fd;
uint32_t watch_flags;
dmon__watch_cb* watch_cb;
void* user_data;
char rootdir[DMON_MAX_PATH];
dmon__watch_subdir* subdirs;
int* wds;
} dmon__watch_state;
typedef struct dmon__state {
dmon__watch_state watches[DMON_MAX_WATCHES];
dmon__inotify_event* events;
int num_watches;
pthread_t thread_handle;
pthread_mutex_t mutex;
volatile int wait_flag;
pthread_mutex_t wait_flag_mutex;
int wake_event_pipe[2];
bool quit;
} dmon__state;
static bool _dmon_init;
static dmon__state _dmon;
/* Implementation of recursive monitoring was removed on Linux for the Lite XL
* application. It is never used with recent version of Lite XL starting from 2.0.5
* and recursive monitoring with inotify was always problematic and half-broken.
* Do not cover the new calling signature with error_code because not used by
* Lite XL. */
#ifndef LITE_XL_DISABLE_INOTIFY_RECURSIVE
_DMON_PRIVATE void dmon__watch_recursive(const char* dirname, int fd, uint32_t mask,
bool followlinks, dmon__watch_state* watch)
{
struct dirent* entry;
DIR* dir = opendir(dirname);
DMON_ASSERT(dir);
char watchdir[DMON_MAX_PATH];
while ((entry = readdir(dir)) != NULL) {
bool entry_valid = false;
if (entry->d_type == DT_DIR) {
if (strcmp(entry->d_name, "..") != 0 && strcmp(entry->d_name, ".") != 0) {
dmon__strcpy(watchdir, sizeof(watchdir), dirname);
dmon__strcat(watchdir, sizeof(watchdir), entry->d_name);
entry_valid = true;
}
} else if (followlinks && entry->d_type == DT_LNK) {
char linkpath[PATH_MAX];
dmon__strcpy(watchdir, sizeof(watchdir), dirname);
dmon__strcat(watchdir, sizeof(watchdir), entry->d_name);
char* r = realpath(watchdir, linkpath);
_DMON_UNUSED(r);
DMON_ASSERT(r);
dmon__strcpy(watchdir, sizeof(watchdir), linkpath);
entry_valid = true;
}
// add sub-directory to watch dirs
if (entry_valid) {
int watchdir_len = (int)strlen(watchdir);
if (watchdir[watchdir_len - 1] != '/') {
watchdir[watchdir_len] = '/';
watchdir[watchdir_len + 1] = '\0';
}
int wd = inotify_add_watch(fd, watchdir, mask);
_DMON_UNUSED(wd);
DMON_ASSERT(wd != -1);
dmon__watch_subdir subdir;
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), watchdir);
if (strstr(subdir.rootdir, watch->rootdir) == subdir.rootdir) {
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), watchdir + strlen(watch->rootdir));
}
stb_sb_push(watch->subdirs, subdir);
stb_sb_push(watch->wds, wd);
// recurse
dmon__watch_recursive(watchdir, fd, mask, followlinks, watch);
}
}
closedir(dir);
}
#endif
_DMON_PRIVATE const char* dmon__find_subdir(const dmon__watch_state* watch, int wd)
{
const int* wds = watch->wds;
for (int i = 0, c = stb_sb_count(wds); i < c; i++) {
if (wd == wds[i]) {
return watch->subdirs[i].rootdir;
}
}
return NULL;
}
#ifndef LITE_XL_DISABLE_INOTIFY_RECURSIVE
_DMON_PRIVATE void dmon__gather_recursive(dmon__watch_state* watch, const char* dirname)
{
struct dirent* entry;
DIR* dir = opendir(dirname);
DMON_ASSERT(dir);
char newdir[DMON_MAX_PATH];
while ((entry = readdir(dir)) != NULL) {
bool entry_valid = false;
bool is_dir = false;
if (strcmp(entry->d_name, "..") != 0 && strcmp(entry->d_name, ".") != 0) {
dmon__strcpy(newdir, sizeof(newdir), dirname);
dmon__strcat(newdir, sizeof(newdir), entry->d_name);
is_dir = (entry->d_type == DT_DIR);
entry_valid = true;
}
// add sub-directory to watch dirs
if (entry_valid) {
dmon__watch_subdir subdir;
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), newdir);
if (strstr(subdir.rootdir, watch->rootdir) == subdir.rootdir) {
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), newdir + strlen(watch->rootdir));
}
dmon__inotify_event dev = { { 0 }, IN_CREATE|(is_dir ? IN_ISDIR : 0), 0, watch->id, false };
dmon__strcpy(dev.filepath, sizeof(dev.filepath), subdir.rootdir);
stb_sb_push(_dmon.events, dev);
}
}
closedir(dir);
}
#endif
_DMON_PRIVATE void dmon__inotify_process_events(void)
{
for (int i = 0, c = stb_sb_count(_dmon.events); i < c; i++) {
dmon__inotify_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
// remove redundant modify events on a single file
if (ev->mask & IN_MODIFY) {
for (int j = i + 1; j < c; j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
if ((check_ev->mask & IN_MODIFY) && strcmp(ev->filepath, check_ev->filepath) == 0) {
ev->skip = true;
break;
} else if ((ev->mask & IN_ISDIR) && (check_ev->mask & (IN_ISDIR|IN_MODIFY))) {
// in some cases, particularly when created files under sub directories
// there can be two modify events for a single subdir one with trailing slash and one without
// remove traling slash from both cases and test
int l1 = (int)strlen(ev->filepath);
int l2 = (int)strlen(check_ev->filepath);
if (ev->filepath[l1-1] == '/') ev->filepath[l1-1] = '\0';
if (check_ev->filepath[l2-1] == '/') check_ev->filepath[l2-1] = '\0';
if (strcmp(ev->filepath, check_ev->filepath) == 0) {
ev->skip = true;
break;
}
}
}
} else if (ev->mask & IN_CREATE) {
bool loop_break = false;
for (int j = i + 1; j < c && !loop_break; j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
if ((check_ev->mask & IN_MOVED_FROM) && strcmp(ev->filepath, check_ev->filepath) == 0) {
// there is a case where some programs (like gedit):
// when we save, it creates a temp file, and moves it to the file being modified
// search for these cases and remove all of them
for (int k = j + 1; k < c; k++) {
dmon__inotify_event* third_ev = &_dmon.events[k];
if (third_ev->mask & IN_MOVED_TO && check_ev->cookie == third_ev->cookie) {
third_ev->mask = IN_MODIFY; // change to modified
ev->skip = check_ev->skip = true;
loop_break = true;
break;
}
}
} else if ((check_ev->mask & IN_MODIFY) && strcmp(ev->filepath, check_ev->filepath) == 0) {
// Another case is that file is copied. CREATE and MODIFY happens sequentially
// so we ignore MODIFY event
check_ev->skip = true;
}
}
} else if (ev->mask & IN_MOVED_FROM) {
bool move_valid = false;
for (int j = i + 1; j < c; j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
if (check_ev->mask & IN_MOVED_TO && ev->cookie == check_ev->cookie) {
move_valid = true;
break;
}
}
// in some environments like nautilus file explorer:
// when a file is deleted, it is moved to recycle bin
// so if the destination of the move is not valid, it's probably DELETE
if (!move_valid) {
ev->mask = IN_DELETE;
}
} else if (ev->mask & IN_MOVED_TO) {
bool move_valid = false;
for (int j = 0; j < i; j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
if (check_ev->mask & IN_MOVED_FROM && ev->cookie == check_ev->cookie) {
move_valid = true;
break;
}
}
// in some environments like nautilus file explorer:
// when a file is deleted, it is moved to recycle bin, on undo it is moved back it
// so if the destination of the move is not valid, it's probably CREATE
if (!move_valid) {
ev->mask = IN_CREATE;
}
} else if (ev->mask & IN_DELETE) {
for (int j = i + 1; j < c; j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
// if the file is DELETED and then MODIFIED after, just ignore the modify event
if ((check_ev->mask & IN_MODIFY) && strcmp(ev->filepath, check_ev->filepath) == 0) {
check_ev->skip = true;
break;
}
}
}
}
// trigger user callbacks
for (int i = 0; i < stb_sb_count(_dmon.events); i++) {
dmon__inotify_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
dmon__watch_state* watch = &_dmon.watches[ev->watch_id.id - 1];
if(watch == NULL || watch->watch_cb == NULL) {
continue;
}
if (ev->mask & IN_CREATE) {
# ifndef LITE_XL_DISABLE_INOTIFY_RECURSIVE
if (ev->mask & IN_ISDIR) {
if (watch->watch_flags & DMON_WATCHFLAGS_RECURSIVE) {
char watchdir[DMON_MAX_PATH];
dmon__strcpy(watchdir, sizeof(watchdir), watch->rootdir);
dmon__strcat(watchdir, sizeof(watchdir), ev->filepath);
dmon__strcat(watchdir, sizeof(watchdir), "/");
uint32_t mask = IN_MOVED_TO | IN_CREATE | IN_MOVED_FROM | IN_DELETE | IN_MODIFY;
int wd = inotify_add_watch(watch->fd, watchdir, mask);
// Removing the assertion below because it was giving errors for some reason
// when building a new package.
// _DMON_UNUSED(wd);
// DMON_ASSERT(wd != -1);
if (wd == -1) continue;
dmon__watch_subdir subdir;
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), watchdir);
if (strstr(subdir.rootdir, watch->rootdir) == subdir.rootdir) {
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), watchdir + strlen(watch->rootdir));
}
stb_sb_push(watch->subdirs, subdir);
stb_sb_push(watch->wds, wd);
// some directories may be already created, for instance, with the command: mkdir -p
// so we will enumerate them manually and add them to the events
dmon__gather_recursive(watch, watchdir);
ev = &_dmon.events[i]; // gotta refresh the pointer because it may be relocated
}
}
# endif
watch->watch_cb(ev->watch_id, DMON_ACTION_CREATE, watch->rootdir, ev->filepath, NULL, watch->user_data);
}
else if (ev->mask & IN_MODIFY) {
watch->watch_cb(ev->watch_id, DMON_ACTION_MODIFY, watch->rootdir, ev->filepath, NULL, watch->user_data);
}
else if (ev->mask & IN_MOVED_FROM) {
for (int j = i + 1; j < stb_sb_count(_dmon.events); j++) {
dmon__inotify_event* check_ev = &_dmon.events[j];
if (check_ev->mask & IN_MOVED_TO && ev->cookie == check_ev->cookie) {
watch->watch_cb(check_ev->watch_id, DMON_ACTION_MOVE, watch->rootdir,
check_ev->filepath, ev->filepath, watch->user_data);
break;
}
}
}
else if (ev->mask & IN_DELETE) {
watch->watch_cb(ev->watch_id, DMON_ACTION_DELETE, watch->rootdir, ev->filepath, NULL, watch->user_data);
}
}
stb_sb_reset(_dmon.events);
}
_DMON_PRIVATE int dmon__safe_get_wait_flag() {
pthread_mutex_lock(&_dmon.wait_flag_mutex);
const int value = _dmon.wait_flag;
pthread_mutex_unlock(&_dmon.wait_flag_mutex);
return value;
}
static void* dmon__thread(void* arg)
{
_DMON_UNUSED(arg);
static uint8_t buff[_DMON_TEMP_BUFFSIZE];
struct timespec req = { (time_t)10 / 1000, (long)(10 * 1000000) };
struct timespec rem = { 0, 0 };
struct timeval timeout;
uint64_t usecs_elapsed = 0;
struct timeval starttm;
gettimeofday(&starttm, 0);
while (!_dmon.quit) {
nanosleep(&req, &rem);
if (_dmon.num_watches == 0 ||
dmon__safe_get_wait_flag() ||
pthread_mutex_trylock(&_dmon.mutex) != 0) {
continue;
}
// Create read FD set
fd_set rfds;
FD_ZERO(&rfds);
const int n = _dmon.num_watches;
int nfds = 0;
for (int i = 0; i < n; i++) {
dmon__watch_state* watch = &_dmon.watches[i];
FD_SET(watch->fd, &rfds);
if (watch->fd > nfds)
nfds = watch->fd;
}
int wake_fd = _dmon.wake_event_pipe[0];
FD_SET(wake_fd, &rfds);
if (wake_fd > nfds)
nfds = wake_fd;
timeout.tv_sec = 0;
timeout.tv_usec = 100000;
const int n_pending = stb_sb_count(_dmon.events);
if (select(nfds + 1, &rfds, NULL, NULL, n_pending > 0 ? &timeout : NULL)) {
if (FD_ISSET(wake_fd, &rfds)) {
char read_char;
read(wake_fd, &read_char, 1);
}
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__watch_state* watch = &_dmon.watches[i];
if (FD_ISSET(watch->fd, &rfds)) {
ssize_t offset = 0;
ssize_t len = read(watch->fd, buff, _DMON_TEMP_BUFFSIZE);
if (len <= 0) {
continue;
}
while (offset < len) {
struct inotify_event* iev = (struct inotify_event*)&buff[offset];
const char *subdir = dmon__find_subdir(watch, iev->wd);
if (subdir) {
char filepath[DMON_MAX_PATH];
dmon__strcpy(filepath, sizeof(filepath), subdir);
dmon__strcat(filepath, sizeof(filepath), iev->name);
// TODO: ignore directories if flag is set
if (stb_sb_count(_dmon.events) == 0) {
usecs_elapsed = 0;
}
dmon__inotify_event dev = { { 0 }, iev->mask, iev->cookie, watch->id, false };
dmon__strcpy(dev.filepath, sizeof(dev.filepath), filepath);
stb_sb_push(_dmon.events, dev);
}
offset += sizeof(struct inotify_event) + iev->len;
}
}
}
}
struct timeval tm;
gettimeofday(&tm, 0);
long dt = (tm.tv_sec - starttm.tv_sec) * 1000000 + tm.tv_usec - starttm.tv_usec;
starttm = tm;
usecs_elapsed += dt;
if (usecs_elapsed > 100000 && stb_sb_count(_dmon.events) > 0) {
dmon__inotify_process_events();
usecs_elapsed = 0;
}
pthread_mutex_unlock(&_dmon.mutex);
}
return 0x0;
}
_DMON_PRIVATE void dmon__mutex_wakeup_lock(void) {
pthread_mutex_lock(&_dmon.wait_flag_mutex);
_dmon.wait_flag = 1;
if (pthread_mutex_trylock(&_dmon.mutex) != 0) {
char send_char = 1;
write(_dmon.wake_event_pipe[1], &send_char, 1);
pthread_mutex_lock(&_dmon.mutex);
}
_dmon.wait_flag = 0;
pthread_mutex_unlock(&_dmon.wait_flag_mutex);
}
_DMON_PRIVATE void dmon__unwatch(dmon__watch_state* watch)
{
close(watch->fd);
stb_sb_free(watch->subdirs);
stb_sb_free(watch->wds);
memset(watch, 0x0, sizeof(dmon__watch_state));
}
DMON_API_IMPL void dmon_init(void)
{
DMON_ASSERT(!_dmon_init);
pthread_mutex_init(&_dmon.mutex, NULL);
_dmon.wait_flag = 0;
int ret_pipe = pipe(_dmon.wake_event_pipe);
DMON_ASSERT(ret_pipe == 0);
int r = pthread_create(&_dmon.thread_handle, NULL, dmon__thread, NULL);
_DMON_UNUSED(r);
DMON_ASSERT(r == 0 && "pthread_create failed");
_dmon_init = true;
}
DMON_API_IMPL void dmon_deinit(void)
{
DMON_ASSERT(_dmon_init);
_dmon.quit = true;
dmon__mutex_wakeup_lock();
pthread_join(_dmon.thread_handle, NULL);
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__unwatch(&_dmon.watches[i]);
}
pthread_mutex_unlock(&_dmon.mutex);
pthread_mutex_destroy(&_dmon.mutex);
stb_sb_free(_dmon.events);
_dmon_init = false;
}
DMON_API_IMPL dmon_watch_id dmon_watch(const char* rootdir,
void (*watch_cb)(dmon_watch_id watch_id, dmon_action action,
const char* dirname, const char* filename,
const char* oldname, void* user),
uint32_t flags, void* user_data, dmon_error *error_code)
{
DMON_ASSERT(watch_cb);
DMON_ASSERT(rootdir && rootdir[0]);
dmon__mutex_wakeup_lock();
DMON_ASSERT(_dmon.num_watches < DMON_MAX_WATCHES);
uint32_t id = ++_dmon.num_watches;
dmon__watch_state* watch = &_dmon.watches[id - 1];
watch->id = dmon__make_id(id);
watch->watch_flags = flags;
watch->watch_cb = watch_cb;
watch->user_data = user_data;
struct stat root_st;
if (stat(rootdir, &root_st) != 0 || !S_ISDIR(root_st.st_mode) ||
(root_st.st_mode & S_IRUSR) != S_IRUSR) {
*error_code = DMON_ERROR_OPEN_DIR;
pthread_mutex_unlock(&_dmon.mutex);
return dmon__make_id(0);
}
if (S_ISLNK(root_st.st_mode)) {
if (flags & DMON_WATCHFLAGS_FOLLOW_SYMLINKS) {
char linkpath[PATH_MAX];
char* r = realpath(rootdir, linkpath);
_DMON_UNUSED(r);
DMON_ASSERT(r);
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, linkpath);
} else {
*error_code = DMON_ERROR_UNSUPPORTED_SYMLINK;
pthread_mutex_unlock(&_dmon.mutex);
return dmon__make_id(0);
}
} else {
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, rootdir);
}
// add trailing slash
int rootdir_len = (int)strlen(watch->rootdir);
if (watch->rootdir[rootdir_len - 1] != '/') {
watch->rootdir[rootdir_len] = '/';
watch->rootdir[rootdir_len + 1] = '\0';
}
watch->fd = inotify_init();
if (watch->fd < -1) {
*error_code = DMON_ERROR_MONITOR_FAIL;
pthread_mutex_unlock(&_dmon.mutex);
return dmon__make_id(0);
}
uint32_t inotify_mask = IN_MOVED_TO | IN_CREATE | IN_MOVED_FROM | IN_DELETE | IN_MODIFY;
int wd = inotify_add_watch(watch->fd, watch->rootdir, inotify_mask);
if (wd < 0) {
*error_code = DMON_ERROR_WATCH_DIR;
pthread_mutex_unlock(&_dmon.mutex);
return dmon__make_id(0);
}
dmon__watch_subdir subdir;
dmon__strcpy(subdir.rootdir, sizeof(subdir.rootdir), ""); // root dir is just a dummy entry
stb_sb_push(watch->subdirs, subdir);
stb_sb_push(watch->wds, wd);
// recursive mode: enumarate all child directories and add them to watch
#ifndef LITE_XL_DISABLE_INOTIFY_RECURSIVE
if (flags & DMON_WATCHFLAGS_RECURSIVE) {
dmon__watch_recursive(watch->rootdir, watch->fd, inotify_mask,
(flags & DMON_WATCHFLAGS_FOLLOW_SYMLINKS) ? true : false, watch);
}
#endif
pthread_mutex_unlock(&_dmon.mutex);
return dmon__make_id(id);
}
DMON_API_IMPL void dmon_unwatch(dmon_watch_id id)
{
DMON_ASSERT(id.id > 0);
dmon__mutex_wakeup_lock();
int index = id.id - 1;
DMON_ASSERT(index < _dmon.num_watches);
dmon__unwatch(&_dmon.watches[index]);
if (index != _dmon.num_watches - 1) {
dmon__swap(_dmon.watches[index], _dmon.watches[_dmon.num_watches - 1], dmon__watch_state);
}
--_dmon.num_watches;
pthread_mutex_unlock(&_dmon.mutex);
}
#elif DMON_OS_MACOS
// FSEvents MacOS backend
typedef struct dmon__fsevent_event {
char filepath[DMON_MAX_PATH];
uint64_t event_id;
long event_flags;
dmon_watch_id watch_id;
bool skip;
bool move_valid;
} dmon__fsevent_event;
typedef struct dmon__watch_state {
dmon_watch_id id;
uint32_t watch_flags;
FSEventStreamRef fsev_stream_ref;
dmon__watch_cb* watch_cb;
void* user_data;
char rootdir[DMON_MAX_PATH];
char rootdir_unmod[DMON_MAX_PATH];
bool init;
} dmon__watch_state;
typedef struct dmon__state {
dmon__watch_state watches[DMON_MAX_WATCHES];
dmon__fsevent_event* events;
int num_watches;
volatile int modify_watches;
pthread_t thread_handle;
dispatch_semaphore_t thread_sem;
pthread_mutex_t mutex;
CFRunLoopRef cf_loop_ref;
CFAllocatorRef cf_alloc_ref;
bool quit;
} dmon__state;
union dmon__cast_userdata {
void* ptr;
uint32_t id;
};
static bool _dmon_init;
static dmon__state _dmon;
_DMON_PRIVATE void* dmon__cf_malloc(CFIndex size, CFOptionFlags hints, void* info)
{
_DMON_UNUSED(hints);
_DMON_UNUSED(info);
return DMON_MALLOC(size);
}
_DMON_PRIVATE void dmon__cf_free(void* ptr, void* info)
{
_DMON_UNUSED(info);
DMON_FREE(ptr);
}
_DMON_PRIVATE void* dmon__cf_realloc(void* ptr, CFIndex newsize, CFOptionFlags hints, void* info)
{
_DMON_UNUSED(hints);
_DMON_UNUSED(info);
return DMON_REALLOC(ptr, (size_t)newsize);
}
_DMON_PRIVATE void dmon__fsevent_process_events(void)
{
for (int i = 0, c = stb_sb_count(_dmon.events); i < c; i++) {
dmon__fsevent_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
// remove redundant modify events on a single file
if (ev->event_flags & kFSEventStreamEventFlagItemModified) {
for (int j = i + 1; j < c; j++) {
dmon__fsevent_event* check_ev = &_dmon.events[j];
if ((check_ev->event_flags & kFSEventStreamEventFlagItemModified) &&
strcmp(ev->filepath, check_ev->filepath) == 0) {
ev->skip = true;
break;
}
}
} else if ((ev->event_flags & kFSEventStreamEventFlagItemRenamed) && !ev->move_valid) {
for (int j = i + 1; j < c; j++) {
dmon__fsevent_event* check_ev = &_dmon.events[j];
if ((check_ev->event_flags & kFSEventStreamEventFlagItemRenamed) &&
check_ev->event_id == (ev->event_id + 1)) {
ev->move_valid = check_ev->move_valid = true;
break;
}
}
// in some environments like finder file explorer:
// when a file is deleted, it is moved to recycle bin
// so if the destination of the move is not valid, it's probably DELETE or CREATE
// decide CREATE if file exists
if (!ev->move_valid) {
ev->event_flags &= ~kFSEventStreamEventFlagItemRenamed;
char abs_filepath[DMON_MAX_PATH];
dmon__watch_state* watch = &_dmon.watches[ev->watch_id.id-1];
dmon__strcpy(abs_filepath, sizeof(abs_filepath), watch->rootdir);
dmon__strcat(abs_filepath, sizeof(abs_filepath), ev->filepath);
struct stat root_st;
if (stat(abs_filepath, &root_st) != 0) {
ev->event_flags |= kFSEventStreamEventFlagItemRemoved;
} else {
ev->event_flags |= kFSEventStreamEventFlagItemCreated;
}
}
}
}
// trigger user callbacks
for (int i = 0, c = stb_sb_count(_dmon.events); i < c; i++) {
dmon__fsevent_event* ev = &_dmon.events[i];
if (ev->skip) {
continue;
}
dmon__watch_state* watch = &_dmon.watches[ev->watch_id.id - 1];
if(watch == NULL || watch->watch_cb == NULL) {
continue;
}
if (ev->event_flags & kFSEventStreamEventFlagItemCreated) {
watch->watch_cb(ev->watch_id, DMON_ACTION_CREATE, watch->rootdir_unmod, ev->filepath, NULL,
watch->user_data);
} else if (ev->event_flags & kFSEventStreamEventFlagItemModified) {
watch->watch_cb(ev->watch_id, DMON_ACTION_MODIFY, watch->rootdir_unmod, ev->filepath, NULL,
watch->user_data);
} else if (ev->event_flags & kFSEventStreamEventFlagItemRenamed) {
for (int j = i + 1; j < c; j++) {
dmon__fsevent_event* check_ev = &_dmon.events[j];
if (check_ev->event_flags & kFSEventStreamEventFlagItemRenamed) {
watch->watch_cb(check_ev->watch_id, DMON_ACTION_MOVE, watch->rootdir_unmod,
check_ev->filepath, ev->filepath, watch->user_data);
break;
}
}
} else if (ev->event_flags & kFSEventStreamEventFlagItemRemoved) {
watch->watch_cb(ev->watch_id, DMON_ACTION_DELETE, watch->rootdir_unmod, ev->filepath, NULL,
watch->user_data);
}
}
stb_sb_reset(_dmon.events);
}
static void* dmon__thread(void* arg)
{
_DMON_UNUSED(arg);
struct timespec req = { (time_t)10 / 1000, (long)(10 * 1000000) };
struct timespec rem = { 0, 0 };
_dmon.cf_loop_ref = CFRunLoopGetCurrent();
dispatch_semaphore_signal(_dmon.thread_sem);
while (!_dmon.quit) {
if (_dmon.modify_watches || pthread_mutex_trylock(&_dmon.mutex) != 0) {
nanosleep(&req, &rem);
continue;
}
if (_dmon.num_watches == 0) {
nanosleep(&req, &rem);
pthread_mutex_unlock(&_dmon.mutex);
continue;
}
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__watch_state* watch = &_dmon.watches[i];
if (!watch->init) {
DMON_ASSERT(watch->fsev_stream_ref);
FSEventStreamScheduleWithRunLoop(watch->fsev_stream_ref, _dmon.cf_loop_ref,
kCFRunLoopDefaultMode);
FSEventStreamStart(watch->fsev_stream_ref);
watch->init = true;
}
}
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.5, kCFRunLoopRunTimedOut);
dmon__fsevent_process_events();
pthread_mutex_unlock(&_dmon.mutex);
}
CFRunLoopStop(_dmon.cf_loop_ref);
_dmon.cf_loop_ref = NULL;
return 0x0;
}
_DMON_PRIVATE void dmon__unwatch(dmon__watch_state* watch)
{
if (watch->fsev_stream_ref) {
FSEventStreamStop(watch->fsev_stream_ref);
FSEventStreamInvalidate(watch->fsev_stream_ref);
FSEventStreamRelease(watch->fsev_stream_ref);
watch->fsev_stream_ref = NULL;
}
memset(watch, 0x0, sizeof(dmon__watch_state));
}
DMON_API_IMPL void dmon_init(void)
{
DMON_ASSERT(!_dmon_init);
pthread_mutex_init(&_dmon.mutex, NULL);
CFAllocatorContext cf_alloc_ctx = { 0 };
cf_alloc_ctx.allocate = dmon__cf_malloc;
cf_alloc_ctx.deallocate = dmon__cf_free;
cf_alloc_ctx.reallocate = dmon__cf_realloc;
_dmon.cf_alloc_ref = CFAllocatorCreate(NULL, &cf_alloc_ctx);
_dmon.thread_sem = dispatch_semaphore_create(0);
DMON_ASSERT(_dmon.thread_sem);
int r = pthread_create(&_dmon.thread_handle, NULL, dmon__thread, NULL);
_DMON_UNUSED(r);
DMON_ASSERT(r == 0 && "pthread_create failed");
// wait for thread to initialize loop object
dispatch_semaphore_wait(_dmon.thread_sem, DISPATCH_TIME_FOREVER);
_dmon_init = true;
}
DMON_API_IMPL void dmon_deinit(void)
{
DMON_ASSERT(_dmon_init);
_dmon.quit = true;
pthread_join(_dmon.thread_handle, NULL);
dispatch_release(_dmon.thread_sem);
for (int i = 0; i < _dmon.num_watches; i++) {
dmon__unwatch(&_dmon.watches[i]);
}
pthread_mutex_destroy(&_dmon.mutex);
stb_sb_free(_dmon.events);
if (_dmon.cf_alloc_ref) {
CFRelease(_dmon.cf_alloc_ref);
}
_dmon_init = false;
}
_DMON_PRIVATE void dmon__fsevent_callback(ConstFSEventStreamRef stream_ref, void* user_data,
size_t num_events, void* event_paths,
const FSEventStreamEventFlags event_flags[],
const FSEventStreamEventId event_ids[])
{
_DMON_UNUSED(stream_ref);
union dmon__cast_userdata _userdata;
_userdata.ptr = user_data;
dmon_watch_id watch_id = dmon__make_id(_userdata.id);
DMON_ASSERT(watch_id.id > 0);
dmon__watch_state* watch = &_dmon.watches[watch_id.id - 1];
char abs_filepath[DMON_MAX_PATH];
char abs_filepath_lower[DMON_MAX_PATH];
for (size_t i = 0; i < num_events; i++) {
const char* filepath = ((const char**)event_paths)[i];
long flags = (long)event_flags[i];
uint64_t event_id = (uint64_t)event_ids[i];
dmon__fsevent_event ev;
memset(&ev, 0x0, sizeof(ev));
dmon__strcpy(abs_filepath, sizeof(abs_filepath), filepath);
dmon__unixpath(abs_filepath, sizeof(abs_filepath), abs_filepath);
// normalize path, so it would be the same on both MacOS file-system types (case/nocase)
dmon__tolower(abs_filepath_lower, sizeof(abs_filepath), abs_filepath);
DMON_ASSERT(strstr(abs_filepath_lower, watch->rootdir) == abs_filepath_lower);
// strip the root dir from the begining
dmon__strcpy(ev.filepath, sizeof(ev.filepath), abs_filepath + strlen(watch->rootdir));
ev.event_flags = flags;
ev.event_id = event_id;
ev.watch_id = watch_id;
stb_sb_push(_dmon.events, ev);
}
}
DMON_API_IMPL dmon_watch_id dmon_watch(const char* rootdir,
void (*watch_cb)(dmon_watch_id watch_id, dmon_action action,
const char* dirname, const char* filename,
const char* oldname, void* user),
uint32_t flags, void* user_data, dmon_error *error_code)
{
DMON_ASSERT(watch_cb);
DMON_ASSERT(rootdir && rootdir[0]);
__sync_lock_test_and_set(&_dmon.modify_watches, 1);
pthread_mutex_lock(&_dmon.mutex);
DMON_ASSERT(_dmon.num_watches < DMON_MAX_WATCHES);
uint32_t id = ++_dmon.num_watches;
dmon__watch_state* watch = &_dmon.watches[id - 1];
watch->id = dmon__make_id(id);
watch->watch_flags = flags;
watch->watch_cb = watch_cb;
watch->user_data = user_data;
struct stat root_st;
if (stat(rootdir, &root_st) != 0 || !S_ISDIR(root_st.st_mode) ||
(root_st.st_mode & S_IRUSR) != S_IRUSR) {
*error_code = DMON_ERROR_OPEN_DIR;
pthread_mutex_unlock(&_dmon.mutex);
__sync_lock_test_and_set(&_dmon.modify_watches, 0);
return dmon__make_id(0);
}
if (S_ISLNK(root_st.st_mode)) {
if (flags & DMON_WATCHFLAGS_FOLLOW_SYMLINKS) {
char linkpath[PATH_MAX];
char* r = realpath(rootdir, linkpath);
_DMON_UNUSED(r);
DMON_ASSERT(r);
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, linkpath);
} else {
*error_code = DMON_ERROR_UNSUPPORTED_SYMLINK;
pthread_mutex_unlock(&_dmon.mutex);
__sync_lock_test_and_set(&_dmon.modify_watches, 0);
return dmon__make_id(0);
}
} else {
char rootdir_abspath[DMON_MAX_PATH];
if (realpath(rootdir, rootdir_abspath) != NULL) {
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, rootdir_abspath);
} else {
dmon__strcpy(watch->rootdir, sizeof(watch->rootdir) - 1, rootdir);
}
}
dmon__unixpath(watch->rootdir, sizeof(watch->rootdir), watch->rootdir);
// add trailing slash
int rootdir_len = (int)strlen(watch->rootdir);
if (watch->rootdir[rootdir_len - 1] != '/') {
watch->rootdir[rootdir_len] = '/';
watch->rootdir[rootdir_len + 1] = '\0';
}
dmon__strcpy(watch->rootdir_unmod, sizeof(watch->rootdir_unmod), watch->rootdir);
dmon__tolower(watch->rootdir, sizeof(watch->rootdir), watch->rootdir);
// create FS objects
CFStringRef cf_dir = CFStringCreateWithCString(NULL, watch->rootdir_unmod, kCFStringEncodingUTF8);
CFArrayRef cf_dirarr = CFArrayCreate(NULL, (const void**)&cf_dir, 1, NULL);
FSEventStreamContext ctx;
union dmon__cast_userdata userdata;
userdata.id = id;
ctx.version = 0;
ctx.info = userdata.ptr;
ctx.retain = NULL;
ctx.release = NULL;
ctx.copyDescription = NULL;
watch->fsev_stream_ref = FSEventStreamCreate(_dmon.cf_alloc_ref, dmon__fsevent_callback, &ctx,
cf_dirarr, kFSEventStreamEventIdSinceNow, 0.25,
kFSEventStreamCreateFlagFileEvents);
CFRelease(cf_dirarr);
CFRelease(cf_dir);
pthread_mutex_unlock(&_dmon.mutex);
__sync_lock_test_and_set(&_dmon.modify_watches, 0);
return dmon__make_id(id);
}
DMON_API_IMPL void dmon_unwatch(dmon_watch_id id)
{
DMON_ASSERT(id.id > 0);
__sync_lock_test_and_set(&_dmon.modify_watches, 1);
pthread_mutex_lock(&_dmon.mutex);
int index = id.id - 1;
DMON_ASSERT(index < _dmon.num_watches);
dmon__unwatch(&_dmon.watches[index]);
if (index != _dmon.num_watches - 1) {
dmon__swap(_dmon.watches[index], _dmon.watches[_dmon.num_watches - 1], dmon__watch_state);
}
--_dmon.num_watches;
pthread_mutex_unlock(&_dmon.mutex);
__sync_lock_test_and_set(&_dmon.modify_watches, 0);
}
#endif
#endif // DMON_IMPL
#endif // __DMON_H__
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