+ FREE(mailbox);
+ DEBUG("Exiting message loop");
+ return ret;
+}
+
+/* Execute `fusermount -u', which is installed setuid root, to unmount the WIM.
+ *
+ * FUSE does not yet implement synchronous unmounts. This means that fusermount
+ * -u will return before the filesystem daemon returns from wimfs_destroy().
+ * This is partly what we want, because we need to send a message from this
+ * process to the filesystem daemon telling whether --commit was specified or
+ * not. However, after that, the unmount process must wait for the filesystem
+ * daemon to finish writing the WIM file.
+ */
+static int
+execute_fusermount(const char *dir)
+{
+ pid_t pid;
+ int ret;
+ int status;
+
+ pid = fork();
+ if (pid == -1) {
+ ERROR_WITH_ERRNO("Failed to fork()");
+ return WIMLIB_ERR_FORK;
+ }
+ if (pid == 0) {
+ /* Child */
+ execlp("fusermount", "fusermount", "-u", dir, NULL);
+ ERROR_WITH_ERRNO("Failed to execute `fusermount'");
+ exit(WIMLIB_ERR_FUSERMOUNT);
+ }
+
+ /* Parent */
+ ret = waitpid(pid, &status, 0);
+ if (ret == -1) {
+ ERROR_WITH_ERRNO("Failed to wait for fusermount process to "
+ "terminate");
+ return WIMLIB_ERR_FUSERMOUNT;
+ }
+
+ if (!WIFEXITED(status)) {
+ ERROR("'fusermount' did not terminate normally!");
+ return WIMLIB_ERR_FUSERMOUNT;
+ }
+
+ status = WEXITSTATUS(status);
+
+ if (status == 0)
+ return 0;
+
+ if (status != WIMLIB_ERR_FUSERMOUNT)
+ return WIMLIB_ERR_FUSERMOUNT;
+
+ /* Try again, but with the `umount' program. This is required on other
+ * FUSE implementations such as FreeBSD's that do not have a
+ * `fusermount' program. */
+ ERROR("Falling back to 'umount'. Note: you may need to be "
+ "root for this to work");
+ pid = fork();
+ if (pid == -1) {
+ ERROR_WITH_ERRNO("Failed to fork()");
+ return WIMLIB_ERR_FORK;
+ }
+ if (pid == 0) {
+ /* Child */
+ execlp("umount", "umount", dir, NULL);
+ ERROR_WITH_ERRNO("Failed to execute `umount'");
+ exit(WIMLIB_ERR_FUSERMOUNT);
+ }
+
+ /* Parent */
+ ret = waitpid(pid, &status, 0);
+ if (ret == -1) {
+ ERROR_WITH_ERRNO("Failed to wait for `umount' process to "
+ "terminate");
+ return WIMLIB_ERR_FUSERMOUNT;
+ }
+ if (status != 0) {
+ ERROR("`umount' did not successfully complete");
+ return WIMLIB_ERR_FUSERMOUNT;
+ }
+ return 0;
+}
+
+#if 0
+static int wimfs_access(const char *path, int mask)
+{
+ return -ENOSYS;
+}
+#endif
+
+static int
+wimfs_chmod(const char *path, mode_t mask)
+{
+ struct wim_dentry *dentry;
+ struct wimfs_context *ctx = wimfs_get_context();
+ int ret;
+
+ if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
+ return -EPERM;
+
+ ret = lookup_resource(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK,
+ &dentry, NULL, NULL);
+ if (ret)
+ return ret;
+
+ ret = inode_set_unix_data(dentry->d_inode, ctx->default_uid,
+ ctx->default_gid, mask,
+ ctx->wim->lookup_table, UNIX_DATA_MODE);
+ return ret ? -ENOMEM : 0;
+}
+
+static int
+wimfs_chown(const char *path, uid_t uid, gid_t gid)
+{
+ struct wim_dentry *dentry;
+ struct wimfs_context *ctx = wimfs_get_context();
+ int ret;
+
+ if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
+ return -EPERM;
+
+ ret = lookup_resource(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK,
+ &dentry, NULL, NULL);
+ if (ret)
+ return ret;
+
+ ret = inode_set_unix_data(dentry->d_inode, uid, gid,
+ inode_default_unix_mode(dentry->d_inode),
+ ctx->wim->lookup_table,
+ UNIX_DATA_UID | UNIX_DATA_GID);
+ return ret ? -ENOMEM : 0;
+}
+
+/* Called when the filesystem is unmounted. */
+static void
+wimfs_destroy(void *p)
+{
+ struct wimfs_context *wimfs_ctx = wimfs_get_context();
+ if (open_message_queues(wimfs_ctx, true) == 0) {
+ struct daemon_msg_handler_context handler_ctx = {
+ .hdr = {
+ .timeout_seconds = 5,
+ },
+ .wimfs_ctx = wimfs_ctx,
+ };
+ message_loop(wimfs_ctx->unmount_to_daemon_mq,
+ &daemon_msg_handler_callbacks,
+ &handler_ctx.hdr);
+ }