unix, windows: nanosecond resolution for uv_fs_[fl]stat

Closes #739.

include/uv-private/uv-unix.h

@@ -121,7 +121,6 @@ typedef struct {
 
 typedef int uv_file;
 typedef int uv_os_sock_t;
-typedef struct stat uv_statbuf_t;
 
 #define UV_ONCE_INIT PTHREAD_ONCE_INIT
 

include/uv-private/uv-win.h

@@ -207,8 +207,6 @@ typedef struct uv_buf_t {
 
 typedef int uv_file;
 
-typedef struct _stati64 uv_statbuf_t;
-
 typedef SOCKET uv_os_sock_t;
 
 typedef HANDLE uv_thread_t;

include/uv.h

@@ -350,6 +350,29 @@ typedef void (*uv_getaddrinfo_cb)(uv_getaddrinfo_t* req,
                                   int status,
                                   struct addrinfo* res);
 
+typedef struct {
+  long tv_sec;
+  long tv_nsec;
+} uv_timespec_t;
+
+
+typedef struct {
+  uint64_t st_dev;
+  uint64_t st_mode;
+  uint64_t st_nlink;
+  uint64_t st_uid;
+  uint64_t st_gid;
+  uint64_t st_rdev;
+  uint64_t st_ino;
+  uint64_t st_size;
+  uint64_t st_blksize;
+  uint64_t st_blocks;
+  uv_timespec_t st_atim;
+  uv_timespec_t st_mtim;
+  uv_timespec_t st_ctim;
+} uv_stat_t;
+
+
 /*
 * This will be called repeatedly after the uv_fs_event_t is initialized.
 * If uv_fs_event_t was initialized with a directory the filename parameter
@@ -361,8 +384,8 @@ typedef void (*uv_fs_event_cb)(uv_fs_event_t* handle, const char* filename,
 
 typedef void (*uv_fs_poll_cb)(uv_fs_poll_t* handle,
                               int status,
-                              const uv_statbuf_t* prev,
-                              const uv_statbuf_t* curr);
+                              const uv_stat_t* prev,
+                              const uv_stat_t* curr);
 
 typedef void (*uv_signal_cb)(uv_signal_t* handle, int signum);
 
@@ -1519,7 +1542,7 @@ struct uv_fs_s {
   void* ptr;
   const char* path;
   uv_err_code errorno;
-  uv_statbuf_t statbuf;  /* Stores the result of uv_fs_stat and uv_fs_fstat. */
+  uv_stat_t statbuf;  /* Stores the result of uv_fs_stat and uv_fs_fstat. */
   UV_FS_PRIVATE_FIELDS
 };
 
@@ -1646,7 +1669,7 @@ UV_EXTERN int uv_fs_poll_init(uv_loop_t* loop, uv_fs_poll_t* handle);
  * or the error reason changes).
  *
  * When `status == 0`, your callback receives pointers to the old and new
- * `uv_statbuf_t` structs. They are valid for the duration of the callback
+ * `uv_stat_t` structs. They are valid for the duration of the callback
  * only!
  *
  * For maximum portability, use multi-second intervals. Sub-second intervals

src/fs-poll.c

@@ -35,16 +35,16 @@ struct poll_ctx {
   uv_fs_poll_cb poll_cb;
   uv_timer_t timer_handle;
   uv_fs_t fs_req; /* TODO(bnoordhuis) mark fs_req internal */
-  uv_statbuf_t statbuf;
+  uv_stat_t statbuf;
   char path[1]; /* variable length */
 };
 
-static int statbuf_eq(const uv_statbuf_t* a, const uv_statbuf_t* b);
+static int statbuf_eq(const uv_stat_t* a, const uv_stat_t* b);
 static void poll_cb(uv_fs_t* req);
 static void timer_cb(uv_timer_t* timer, int status);
 static void timer_close_cb(uv_handle_t* handle);
 
-static uv_statbuf_t zero_statbuf;
+static uv_stat_t zero_statbuf;
 
 
 int uv_fs_poll_init(uv_loop_t* loop, uv_fs_poll_t* handle) {
@@ -137,7 +137,7 @@ static void timer_cb(uv_timer_t* timer, int status) {
 
 
 static void poll_cb(uv_fs_t* req) {
-  uv_statbuf_t* statbuf;
+  uv_stat_t* statbuf;
   struct poll_ctx* ctx;
   uint64_t interval;
 
@@ -189,48 +189,17 @@ static void timer_close_cb(uv_handle_t* handle) {
 }
 
 
-static int statbuf_eq(const uv_statbuf_t* a, const uv_statbuf_t* b) {
-#if defined(_WIN32)
-  return a->st_mtime == b->st_mtime
-      && a->st_size == b->st_size
-      && a->st_mode == b->st_mode;
-#else
-
-  /* Jump through a few hoops to get sub-second granularity on Linux. */
-# if defined(__linux__)
-#  if defined(__USE_MISC) /* _BSD_SOURCE || _SVID_SOURCE */
-  if (a->st_ctim.tv_nsec != b->st_ctim.tv_nsec) return 0;
-  if (a->st_mtim.tv_nsec != b->st_mtim.tv_nsec) return 0;
-#  else
-  if (a->st_ctimensec != b->st_ctimensec) return 0;
-  if (a->st_mtimensec != b->st_mtimensec) return 0;
-#  endif
-# endif
-
-  /* Jump through different hoops on OS X. */
-# if defined(__APPLE__)
-#  if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
-  if (a->st_ctimespec.tv_nsec != b->st_ctimespec.tv_nsec) return 0;
-  if (a->st_mtimespec.tv_nsec != b->st_mtimespec.tv_nsec) return 0;
-#  else
-  if (a->st_ctimensec != b->st_ctimensec) return 0;
-  if (a->st_mtimensec != b->st_mtimensec) return 0;
-#  endif
-# endif
-
-  /* TODO(bnoordhuis) Other Unices have st_ctim and friends too, provided
-   * the stars and compiler flags are right...
-   */
-
-  return a->st_ctime == b->st_ctime
-      && a->st_mtime == b->st_mtime
+static int statbuf_eq(const uv_stat_t* a, const uv_stat_t* b) {
+  return a->st_ctim.tv_nsec == b->st_ctim.tv_nsec
+      && a->st_mtim.tv_nsec == b->st_mtim.tv_nsec
+      && a->st_ctim.tv_sec == b->st_ctim.tv_sec
+      && a->st_mtim.tv_sec == b->st_mtim.tv_sec
       && a->st_size == b->st_size
       && a->st_mode == b->st_mode
       && a->st_uid == b->st_uid
       && a->st_gid == b->st_gid
       && a->st_ino == b->st_ino
       && a->st_dev == b->st_dev;
-#endif
 }
 
 

src/unix/fs.c

@@ -497,6 +497,69 @@ static ssize_t uv__fs_write(uv_fs_t* req) {
   return r;
 }
 
+static inline void uv__to_stat(struct stat* src, uv_stat_t* dst) {
+  dst->st_dev = src->st_dev;
+  dst->st_mode = src->st_mode;
+  dst->st_nlink = src->st_nlink;
+  dst->st_uid = src->st_uid;
+  dst->st_gid = src->st_gid;
+  dst->st_rdev = src->st_rdev;
+  dst->st_ino = src->st_ino;
+  dst->st_size = src->st_size;
+  dst->st_blksize = src->st_blksize;
+  dst->st_blocks = src->st_blocks;
+
+#if defined(__APPLE__)
+  dst->st_atim.tv_sec = src->st_atimespec.tv_sec;
+  dst->st_atim.tv_nsec = src->st_atimespec.tv_nsec;
+  dst->st_mtim.tv_sec = src->st_mtimespec.tv_sec;
+  dst->st_mtim.tv_nsec = src->st_mtimespec.tv_nsec;
+  dst->st_ctim.tv_sec = src->st_ctimespec.tv_sec;
+  dst->st_ctim.tv_nsec = src->st_ctimespec.tv_nsec;
+#elif defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(_XOPEN_SOURCE)
+  dst->st_atim.tv_sec = src->st_atim.tv_sec;
+  dst->st_atim.tv_nsec = src->st_atim.tv_nsec;
+  dst->st_mtim.tv_sec = src->st_mtim.tv_sec;
+  dst->st_mtim.tv_nsec = src->st_mtim.tv_nsec;
+  dst->st_ctim.tv_sec = src->st_ctim.tv_sec;
+  dst->st_ctim.tv_nsec = src->st_ctim.tv_nsec;
+#else
+  dst->st_atim.tv_sec = src->st_atime;
+  dst->st_atim.tv_nsec = 0;
+  dst->st_mtim.tv_sec = src->st_mtime;
+  dst->st_mtim.tv_nsec = 0;
+  dst->st_ctim.tv_sec = src->st_ctime;
+  dst->st_ctim.tv_nsec = 0;
+#endif
+}
+
+
+static int uv__fs_stat(const char *path, uv_stat_t *buf) {
+  struct stat pbuf;
+  int ret;
+  ret = stat(path, &pbuf);
+  uv__to_stat(&pbuf, buf);
+  return ret;
+}
+
+
+static int uv__fs_lstat(const char *path, uv_stat_t *buf) {
+  struct stat pbuf;
+  int ret;
+  ret = lstat(path, &pbuf);
+  uv__to_stat(&pbuf, buf);
+  return ret;
+}
+
+
+static int uv__fs_fstat(int fd, uv_stat_t *buf) {
+  struct stat pbuf;
+  int ret;
+  ret = fstat(fd, &pbuf);
+  uv__to_stat(&pbuf, buf);
+  return ret;
+}
+
 
 static void uv__fs_work(struct uv__work* w) {
   int retry_on_eintr;
@@ -521,11 +584,11 @@ static void uv__fs_work(struct uv__work* w) {
     X(FCHMOD, fchmod(req->file, req->mode));
     X(FCHOWN, fchown(req->file, req->uid, req->gid));
     X(FDATASYNC, uv__fs_fdatasync(req));
-    X(FSTAT, fstat(req->file, &req->statbuf));
+    X(FSTAT, uv__fs_fstat(req->file, &req->statbuf));
     X(FSYNC, fsync(req->file));
     X(FTRUNCATE, ftruncate(req->file, req->off));
     X(FUTIME, uv__fs_futime(req));
-    X(LSTAT, lstat(req->path, &req->statbuf));
+    X(LSTAT, uv__fs_lstat(req->path, &req->statbuf));
     X(LINK, link(req->path, req->new_path));
     X(MKDIR, mkdir(req->path, req->mode));
     X(OPEN, open(req->path, req->flags, req->mode));
@@ -535,7 +598,7 @@ static void uv__fs_work(struct uv__work* w) {
     X(RENAME, rename(req->path, req->new_path));
     X(RMDIR, rmdir(req->path));
     X(SENDFILE, uv__fs_sendfile(req));
-    X(STAT, stat(req->path, &req->statbuf));
+    X(STAT, uv__fs_stat(req->path, &req->statbuf));
     X(SYMLINK, symlink(req->path, req->new_path));
     X(UNLINK, unlink(req->path));
     X(UTIME, uv__fs_utime(req));

src/win/fs.c

@@ -77,16 +77,27 @@
     return;                                                                 \
   }
 
+#define FILETIME_TO_UINT(filetime)                                          \
+   (*((uint64_t*) &(filetime)) - 116444736000000000ULL)
+
 #define FILETIME_TO_TIME_T(filetime)                                        \
-   ((*((uint64_t*) &(filetime)) - 116444736000000000ULL) / 10000000ULL);
+   (FILETIME_TO_UINT(filetime) / 10000000ULL);
+
+#define FILETIME_TO_TIME_NS(filetime, secs)                                 \
+   ((FILETIME_TO_UINT(filetime) - (secs * 10000000ULL)) * 100);
+
+#define FILETIME_TO_TIMESPEC(ts, filetime)                                  \
+   do {                                                                     \
+     (ts).tv_sec = FILETIME_TO_TIME_T(filetime);                            \
+     (ts).tv_nsec = FILETIME_TO_TIME_NS(filetime, (ts).tv_sec);             \
+   } while(0)
 
 #define TIME_T_TO_FILETIME(time, filetime_ptr)                              \
   do {                                                                      \
     *(uint64_t*) (filetime_ptr) = ((int64_t) (time) * 10000000LL) +         \
                                   116444736000000000ULL;                    \
   } while(0)
 
-
 #define IS_SLASH(c) ((c) == L'\\' || (c) == L'/')
 #define IS_LETTER(c) (((c) >= L'a' && (c) <= L'z') || \
   ((c) >= L'A' && (c) <= L'Z'))
@@ -808,7 +819,7 @@ void fs__readdir(uv_fs_t* req) {
 }
 
 
-INLINE static int fs__stat_handle(HANDLE handle, uv_statbuf_t* statbuf) {
+INLINE static int fs__stat_handle(HANDLE handle, uv_stat_t* statbuf) {
   BY_HANDLE_FILE_INFORMATION info;
 
   if (!GetFileInformationByHandle(handle, &info)) {
@@ -825,6 +836,9 @@ INLINE static int fs__stat_handle(HANDLE handle, uv_statbuf_t* statbuf) {
 
   statbuf->st_mode = 0;
 
+  statbuf->st_blksize = 0;
+  statbuf->st_blocks = 0;
+
   if (info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
     if (fs__readlink_handle(handle, NULL, &statbuf->st_size) != 0) {
       return -1;
@@ -846,9 +860,9 @@ INLINE static int fs__stat_handle(HANDLE handle, uv_statbuf_t* statbuf) {
       ((_S_IREAD|_S_IWRITE) >> 6));
   }
 
-  statbuf->st_mtime = FILETIME_TO_TIME_T(info.ftLastWriteTime);
-  statbuf->st_atime = FILETIME_TO_TIME_T(info.ftLastAccessTime);
-  statbuf->st_ctime = FILETIME_TO_TIME_T(info.ftCreationTime);
+  FILETIME_TO_TIMESPEC(statbuf->st_mtim, info.ftLastWriteTime);
+  FILETIME_TO_TIMESPEC(statbuf->st_atim, info.ftLastAccessTime);
+  FILETIME_TO_TIMESPEC(statbuf->st_ctim, info.ftCreationTime);
 
   statbuf->st_nlink = (info.nNumberOfLinks <= SHRT_MAX) ?
                       (short) info.nNumberOfLinks : SHRT_MAX;

test/test-fs-poll.c

@@ -30,8 +30,8 @@ static void timer_cb(uv_timer_t* handle, int status);
 static void close_cb(uv_handle_t* handle);
 static void poll_cb(uv_fs_poll_t* handle,
                     int status,
-                    const uv_statbuf_t* prev,
-                    const uv_statbuf_t* curr);
+                    const uv_stat_t* prev,
+                    const uv_stat_t* curr);
 
 static uv_fs_poll_t poll_handle;
 static uv_timer_t timer_handle;
@@ -74,9 +74,9 @@ static void timer_cb(uv_timer_t* handle, int status) {
 
 static void poll_cb(uv_fs_poll_t* handle,
                     int status,
-                    const uv_statbuf_t* prev,
-                    const uv_statbuf_t* curr) {
-  uv_statbuf_t zero_statbuf;
+                    const uv_stat_t* prev,
+                    const uv_stat_t* curr) {
+  uv_stat_t zero_statbuf;
 
   memset(&zero_statbuf, 0, sizeof(zero_statbuf));