filesystem: integrate inotify for file changes

filesystem/filesystem.c

@@ -29,6 +29,9 @@ GNU General Public License for more details.
 #endif
 #include <stdio.h>
 #include <stdarg.h>
+#if XASH_LINUX
+#include <sys/inotify.h>
+#endif
 #include "port.h"
 #include "const.h"
 #include "crtlib.h"

filesystem/filesystem.h

@@ -120,6 +120,9 @@ typedef struct fs_globals_t
 	int		numgames;
 } fs_globals_t;
 
+typedef void (*fs_event_callback_t)( const char *path );
+
+
 typedef struct fs_api_t
 {
 	qboolean (*InitStdio)( qboolean caseinsensitive, const char *rootdir, const char *basedir, const char *gamedir, const char *rodir );
@@ -174,6 +177,10 @@ typedef struct fs_api_t
 	qboolean (*Delete)( const char *path );
 	qboolean (*SysFileExists)( const char *path, qboolean casesensitive );
 	const char *(*GetDiskPath)( const char *name, qboolean gamedironly );
+
+	// file watcher
+	void (*WatchFrame)( void ); // engine will read all events and call appropriate callbacks
+	qboolean (*AddWatch)( const char *path, fs_event_callback_t callback );
 } fs_api_t;
 
 typedef struct fs_interface_t

filesystem/filesystem_internal.h

@@ -189,6 +189,13 @@ void     FS_SearchWAD( stringlist_t *list, wfile_t *wad, const char *pattern );
 byte    *FS_LoadWADFile( const char *path, fs_offset_t *sizeptr, qboolean gamedironly );
 qboolean FS_AddWad_Fullpath( const char *wadfile, qboolean *already_loaded, int flags );
 
+//
+// watch.c
+//
+qboolean FS_WatchInitialize( void );
+int FS_AddWatch( const char *path, fs_event_callback_t callback );
+void FS_WatchFrame( void );
+
 //
 // zip.c
 //

filesystem/watch.c

@@ -0,0 +1,117 @@
+#if 0
+#include "build.h"
+#if XASH_LINUX
+#include <sys/inotify.h>
+#include <errno.h>
+#include <string.h>
+#endif
+#include "filesystem_internal.h"
+#include "common/com_strings.h"
+
+#define MAX_FS_WATCHES 256
+
+struct
+{
+#if XASH_LINUX
+	int fd;
+	int count;
+	struct
+	{
+		fs_event_callback_t callback;
+		int fd;
+	} watch[MAX_FS_WATCHES];
+#endif // XASH_LINUX
+} fsnotify;
+
+#if XASH_LINUX
+static qboolean FS_InotifyInit( void )
+{
+	int fd;
+
+	if(( fd = inotify_init1( IN_NONBLOCK )) < 0 )
+	{
+		Con_Printf( S_ERROR "inotify_init1 failed: %s", strerror( errno ));
+		return false;
+	}
+
+	fsnotify.fd = fd;
+	return true;
+}
+
+static qboolean FS_InotifyWasInit( void )
+{
+	return fsnotify.fd >= 0;
+}
+#endif
+
+/*
+===============
+FS_AddWatch
+
+Adds on-disk path to filesystem watcher list
+Every file modification will call back
+===============
+*/
+int FS_AddWatch( const char *path, fs_event_callback_t callback )
+{
+#if XASH_LINUX
+	int fd;
+	const uint mask = IN_CREATE | IN_DELETE | IN_MODIFY;
+
+	if( !FS_InotifyWasInit() && !FS_InotifyInit())
+			return false;
+
+	if(( fd = inotify_add_watch( fsnotify.fd, path, mask )) < 0 )
+	{
+		Con_Printf( S_ERROR "inotify_add_watch failed: %s", strerror( errno ));
+		return false;
+	}
+
+	fsnotify.watch[fsnotify.count].fd = fd;
+	fsnotify.watch[fsnotify.count].callback = callback;
+
+	return true;
+#else
+	return false;
+#endif
+}
+
+/*
+===============
+FS_WatchFrame
+
+Polls any changes and runs call backs
+===============
+*/
+void FS_WatchFrame( void )
+{
+#if XASH_LINUX
+	int i;
+
+	for( i = 0; i < fsnotify.count; i++ )
+	{
+		struct inotify_event events;
+	}
+
+#endif
+}
+
+/*
+===============
+FS_WatchInitialize
+
+initializes filesystem watcher subsystem
+===============
+*/
+qboolean FS_WatchInitialize( void )
+{
+#if XASH_LINUX
+	fsnotify.fd = -1; // only call inotify init when requested
+	fsnotify.count = 0;
+
+	return true;
+#else
+	return false;
+#endif
+}
+#endif // 0