解决多线程dmabuffer竞态问题

src/hook/zvfs_hook_fd.c

@@ -110,6 +110,9 @@ zvfs_debug_has_fd_mapping(int fd)
     return found;
 }
 
+/* close 路径辅助：在文件后半段实现。 */
+static int zvfs_detach_fd_mapping(int fd, int do_sync_md);
+
 /* ------------------------------------------------------------------ */
 /* 内部：路径判定辅助                                                   */
 /* ------------------------------------------------------------------ */
@@ -779,6 +782,74 @@ fopen64(const char *path, const char *mode)
     return fp;
 }
 
+int
+fclose(FILE *stream)
+{
+    ZVFS_HOOK_ENTER();
+
+    int ret;
+    int ret_errno = 0;
+    int bk_rc = 0;
+    int bk_errno = 0;
+    int fd = -1;
+    int need_bookkeeping = 0;
+
+    if (!stream) {
+        errno = EINVAL;
+        ZVFS_HOOK_LEAVE();
+        return -1;
+    }
+
+    if (!ZVFS_IN_HOOK()) {
+        fd = fileno(stream);
+        if (fd >= 0 && zvfs_is_zvfs_fd(fd)) {
+            need_bookkeeping = 1;
+        }
+    }
+
+    if (!real_fclose) {
+        errno = ENOSYS;
+        ZVFS_HOOK_LEAVE();
+        return -1;
+    }
+
+    if (ZVFS_IN_HOOK() || !need_bookkeeping) {
+        ret = real_fclose(stream);
+        ZVFS_HOOK_LEAVE();
+        return ret;
+    }
+
+    zvfs_ensure_init();
+
+    ret = real_fclose(stream);
+    if (ret < 0) {
+        ret_errno = errno;
+    }
+
+    /*
+     * 无论 real_fclose 是否报错，都尝试回收 zvfs bookkeeping。
+     * 某些 libc 实现即使返回 EOF，也可能已经关闭了底层 fd。
+     */
+    if (zvfs_detach_fd_mapping(fd, 1) < 0) {
+        bk_rc = -1;
+        bk_errno = errno;
+    }
+
+    if (ret < 0) {
+        errno = ret_errno;
+        ZVFS_HOOK_LEAVE();
+        return -1;
+    }
+    if (bk_rc < 0) {
+        errno = bk_errno;
+        ZVFS_HOOK_LEAVE();
+        return -1;
+    }
+
+    ZVFS_HOOK_LEAVE();
+    return 0;
+}
+
 /* ------------------------------------------------------------------ */
 /* creat                                                                */
 /* ------------------------------------------------------------------ */
@@ -1109,6 +1180,7 @@ close(int fd)
 
 int __close(int fd)      { return close(fd); }
 int __libc_close(int fd) { return close(fd); }
+int __close_nocancel(int fd) { return close(fd); }
 
 /* ------------------------------------------------------------------ */
 /* dup helper                                                           */