chore: bump version to 0.0.2

Fixes multiple issues causing segfaults when hot-reloading modules
on Linux, particularly when file changes are detected rapidly:

- Enable is_file_ready() check on Linux to prevent loading partially-written
  shared libraries (previously only used on Windows/BSD)
- Fix event deduplication on Linux to actually remove duplicate inotify events
  instead of just marking them, preventing double-free on same module
- Reorder reload operations to unload old module only after successfully
  copying new version, avoiding invalid state when copy fails

Changes:
- platform.c: Remove __linux__ guards around is_file_ready() function
- platform.c: Add compaction step after deduplication to remove -1 entries
- stk.c: Move module unload to after platform_copy_file() in reload loop

These changes make Linux hot-reload as robust as Windows/BSD implementations.

CHANGELOG.md

@@ -7,6 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.0.2] - 2026-02-09
+
+### Fixed
+- **Linux**: Fixed segfaults during rapid module reloads when file changes are detected in quick succession
+  - Enabled file readiness checks on Linux (previously only used on Windows/BSD) to prevent loading partially-written shared libraries
+  - Fixed inotify event deduplication to actually remove duplicate events instead of just marking them
+  - Reordered reload operations to only unload old module after successfully copying new version, preventing invalid state when copy fails
+- **All platforms**: Improved reload safety by deferring module unload until after successful file copy
+
+### Changed
+- Made `is_file_ready()` check available on all Unix platforms (was previously excluded on Linux)
+
 ## [0.0.1] - 2026-02-01
 
 ### Added
@@ -25,5 +37,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Dependency management and versioning not yet implemented
 - API is unstable and subject to change in future releases
 
-[Unreleased]: https://github.com/anth64/stk/compare/v0.0.1...HEAD
+[Unreleased]: https://github.com/anth64/stk/compare/v0.0.2...HEAD
+[0.0.2]: https://github.com/anth64/stk/releases/tag/v0.0.2
 [0.0.1]: https://github.com/anth64/stk/releases/tag/v0.0.1

README.md

@@ -173,14 +173,15 @@ stk_init();
 
 ## Project Status
 
-**Current Version:** 0.0.1 (Pre-release)
+**Current Version:** 0.0.2 (Pre-release)
 
-This is an early release proving the core hot-reload foundation. Phase 1 is still in progress.
+This is an early bugfix release improving hot-reload stability on Linux. Phase 1 is still in progress.
 
 ### What Works
 - Cross-platform module loading and hot-reloading
 - File watching (inotify/kqueue/FindFirstFile)
 - Basic error handling
+- Stable hot-reload even during rapid file changes (Linux fix in 0.0.2)
 
 ### In Progress (Phase 1)
 - Complete logging system (log levels, verbosity, output configuration)

include/stk_version.h

@@ -3,7 +3,7 @@
 
 #define STK_VERSION_MAJOR 0
 #define STK_VERSION_MINOR 0
-#define STK_VERSION_PATCH 1
+#define STK_VERSION_PATCH 2
 
 #define STK_STRINGIFY_HELPER(x) #x
 #define STK_STRINGIFY(x) STK_STRINGIFY_HELPER(x)

src/platform.c

@@ -32,7 +32,6 @@ int is_mod_loaded(const char *module_name);
 uint8_t is_valid_module_file(const char *filename);
 void extract_module_id(const char *path, char *out_id);
 
-#ifndef __linux__
 static uint8_t is_file_ready(const char *dir_path, const char *filename)
 {
 	char full_path[STK_PATH_MAX_OS];
@@ -80,6 +79,7 @@ static uint8_t is_file_ready(const char *dir_path, const char *filename)
 #endif
 }
 
+#ifndef __linux__
 typedef struct {
 	char filename[STK_PATH_MAX];
 #ifdef _WIN32
@@ -146,7 +146,6 @@ uint8_t platform_copy_file(const char *from, const char *to)
 	FILE *src = NULL, *dst = NULL;
 	char tmp_path[STK_PATH_MAX_OS];
 	size_t n;
-#ifndef __linux__
 	char dir_path[STK_PATH_MAX_OS];
 	const char *filename;
 
@@ -163,7 +162,6 @@ uint8_t platform_copy_file(const char *from, const char *to)
 
 	if (!is_file_ready(dir_path, filename))
 		goto done;
-#endif
 
 	sprintf(tmp_path, "%s.tmp", to);
 
@@ -286,128 +284,127 @@ void *platform_get_symbol(void *h, const char *s)
 #endif
 }
 
-char (*platform_directory_init_scan(const char *dir_path,
-				    size_t *out_count))[STK_PATH_MAX]
-{
-	size_t count = 0, i = 0, name_len;
-	char(*list)[STK_PATH_MAX] = NULL;
+char (*platform_directory_init_scan(const char *dir_path, size_t *out_count))
+    [STK_PATH_MAX] {
+	    size_t count = 0, i = 0, name_len;
+	    char (*list)[STK_PATH_MAX] = NULL;
 #ifdef _WIN32
-	WIN32_FIND_DATAA fd;
-	HANDLE h;
-	char s[STK_PATH_MAX_OS];
+	    WIN32_FIND_DATAA fd;
+	    HANDLE h;
+	    char s[STK_PATH_MAX_OS];
 
-	sprintf(s, "%s\\*", dir_path);
-	h = FindFirstFileA(s, &fd);
-	if (h == INVALID_HANDLE_VALUE)
-		goto create_and_exit;
+	    sprintf(s, "%s\\*", dir_path);
+	    h = FindFirstFileA(s, &fd);
+	    if (h == INVALID_HANDLE_VALUE)
+		    goto create_and_exit;
 
-	do {
-		if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
-			continue;
-		if (is_valid_module_file(fd.cFileName))
-			count++;
-	} while (FindNextFileA(h, &fd));
+	    do {
+		    if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
+			    continue;
+		    if (is_valid_module_file(fd.cFileName))
+			    count++;
+	    } while (FindNextFileA(h, &fd));
 
-	FindClose(h);
+	    FindClose(h);
 
-	if (count == 0)
-		goto exit;
+	    if (count == 0)
+		    goto exit;
 
-	list = malloc(count * sizeof(*list));
-	if (!list)
-		goto exit;
+	    list = malloc(count * sizeof(*list));
+	    if (!list)
+		    goto exit;
 
-	h = FindFirstFileA(s, &fd);
-	if (h == INVALID_HANDLE_VALUE)
-		goto exit;
+	    h = FindFirstFileA(s, &fd);
+	    if (h == INVALID_HANDLE_VALUE)
+		    goto exit;
 
-	do {
-		if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
-			continue;
-		if (is_valid_module_file(fd.cFileName) && i < count) {
-			name_len = strlen(fd.cFileName);
-			if (name_len >= STK_PATH_MAX)
-				name_len = STK_PATH_MAX - 1;
+	    do {
+		    if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
+			    continue;
+		    if (is_valid_module_file(fd.cFileName) && i < count) {
+			    name_len = strlen(fd.cFileName);
+			    if (name_len >= STK_PATH_MAX)
+				    name_len = STK_PATH_MAX - 1;
 
-			memcpy(list[i], fd.cFileName, name_len);
-			list[i][name_len] = '\0';
-			i++;
-		}
-	} while (FindNextFileA(h, &fd));
+			    memcpy(list[i], fd.cFileName, name_len);
+			    list[i][name_len] = '\0';
+			    i++;
+		    }
+	    } while (FindNextFileA(h, &fd));
 
-	FindClose(h);
-	goto exit;
+	    FindClose(h);
+	    goto exit;
 
-create_and_exit:
-	platform_mkdir(dir_path);
-exit:
-	*out_count = i;
-	return list;
+    create_and_exit:
+	    platform_mkdir(dir_path);
+    exit:
+	    *out_count = i;
+	    return list;
 #else
-	DIR *d;
-	struct dirent *e;
-	struct stat st;
-	char f[STK_PATH_MAX_OS];
+	    DIR *d;
+	    struct dirent *e;
+	    struct stat st;
+	    char f[STK_PATH_MAX_OS];
 
-	d = opendir(dir_path);
-	if (!d)
-		goto create_and_exit;
+	    d = opendir(dir_path);
+	    if (!d)
+		    goto create_and_exit;
 
-count_loop:
-	e = readdir(d);
-	if (!e)
-		goto count_done;
+    count_loop:
+	    e = readdir(d);
+	    if (!e)
+		    goto count_done;
 
-	sprintf(f, "%s/%s", dir_path, e->d_name);
-	if (!is_valid_module_file(e->d_name))
-		goto count_loop;
+	    sprintf(f, "%s/%s", dir_path, e->d_name);
+	    if (!is_valid_module_file(e->d_name))
+		    goto count_loop;
 
-	if (stat(f, &st) != 0 || !S_ISREG(st.st_mode))
-		goto count_loop;
+	    if (stat(f, &st) != 0 || !S_ISREG(st.st_mode))
+		    goto count_loop;
 
-	count++;
-	goto count_loop;
+	    count++;
+	    goto count_loop;
 
-count_done:
-	if (count == 0)
-		goto close_and_exit;
+    count_done:
+	    if (count == 0)
+		    goto close_and_exit;
 
-	rewinddir(d);
-	list = malloc(count * sizeof(*list));
-	if (!list)
-		goto close_and_exit;
+	    rewinddir(d);
+	    list = malloc(count * sizeof(*list));
+	    if (!list)
+		    goto close_and_exit;
 
-fill_loop:
-	e = readdir(d);
-	if (!e || i >= count)
-		goto close_and_exit;
+    fill_loop:
+	    e = readdir(d);
+	    if (!e || i >= count)
+		    goto close_and_exit;
 
-	sprintf(f, "%s/%s", dir_path, e->d_name);
-	if (!is_valid_module_file(e->d_name))
-		goto fill_loop;
+	    sprintf(f, "%s/%s", dir_path, e->d_name);
+	    if (!is_valid_module_file(e->d_name))
+		    goto fill_loop;
 
-	if (stat(f, &st) != 0 || !S_ISREG(st.st_mode))
-		goto fill_loop;
+	    if (stat(f, &st) != 0 || !S_ISREG(st.st_mode))
+		    goto fill_loop;
 
-	name_len = strlen(e->d_name);
-	if (name_len >= STK_PATH_MAX) {
-		name_len = STK_PATH_MAX - 1;
-	}
-	memcpy(list[i++], e->d_name, name_len);
-	list[i - 1][name_len] = '\0';
-	goto fill_loop;
+	    name_len = strlen(e->d_name);
+	    if (name_len >= STK_PATH_MAX) {
+		    name_len = STK_PATH_MAX - 1;
+	    }
+	    memcpy(list[i++], e->d_name, name_len);
+	    list[i - 1][name_len] = '\0';
+	    goto fill_loop;
 
-create_and_exit:
-	platform_mkdir(dir_path);
-	*out_count = 0;
-	return NULL;
+    create_and_exit:
+	    platform_mkdir(dir_path);
+	    *out_count = 0;
+	    return NULL;
 
-close_and_exit:
-	closedir(d);
-	*out_count = i;
-	return list;
+    close_and_exit:
+	    closedir(d);
+	    *out_count = i;
+	    return list;
 #endif
-}
+    }
 
 #if !defined(__linux__) && !defined(_WIN32)
 static void update_watches(platform_watch_context_t *ctx)
@@ -665,7 +662,7 @@ stk_module_event_t *platform_directory_watch_check(
 	int fd = (int)(long)handle;
 	char buf[STK_EVENT_BUFFER];
 	ssize_t len;
-	size_t index = 0, count = 0, i;
+	size_t index = 0, count = 0, i, write_idx;
 	stk_module_event_t *evs;
 	char *ptr, *end;
 	struct inotify_event *e;
@@ -763,6 +760,21 @@ stk_module_event_t *platform_directory_watch_check(
 		}
 	}
 
+	write_idx = 0;
+	for (i = 0; i < index; ++i) {
+		if (evs[i] != -1) {
+			if (write_idx != i) {
+				evs[write_idx] = evs[i];
+				strncpy((*file_list)[write_idx],
+					(*file_list)[i], STK_PATH_MAX - 1);
+				(*file_list)[write_idx][STK_PATH_MAX - 1] =
+				    '\0';
+			}
+			write_idx++;
+		}
+	}
+	index = write_idx;
+
 	*out_count = index;
 	return evs;
 

src/stk.c

@@ -242,9 +242,6 @@ begin_operations:
 	for (i = 0; i < unload_count; ++i)
 		stk_module_unload(unloaded_mod_indices[i]);
 
-	for (i = 0; i < reload_count; ++i)
-		stk_module_unload(reloaded_mod_indices[i]);
-
 	for (i = 0; i < reload_count; ++i) {
 		int file_index = reloaded_mod_file_indices[i];
 		int mod_index = reloaded_mod_indices[i];
@@ -261,6 +258,8 @@ begin_operations:
 			continue;
 		}
 
+		stk_module_unload(mod_index);
+
 		load_result = stk_module_load(tmp_path, mod_index);
 		if (load_result != STK_MOD_INIT_SUCCESS) {
 			stk_log(stderr, "Failed to reload module %s: %s",