+ CHROOT_IN;
+ fd = open (path, O_RDONLY);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return NULL;
+ }
+
+ buf = malloc (count);
+ if (buf == NULL) {
+ reply_with_perror ("malloc");
+ close (fd);
+ return NULL;
+ }
+
+ r = pread (fd, buf, count, offset);
+ if (r == -1) {
+ reply_with_perror ("pread: %s", path);
+ close (fd);
+ free (buf);
+ return NULL;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ close (fd);
+ free (buf);
+ return NULL;
+ }
+
+ /* Mustn't touch *size_r until we are sure that we won't return any
+ * error (RHBZ#589039).
+ */
+ *size_r = r;
+ return buf;
+}
+
+int
+do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
+{
+ int fd;
+ ssize_t r;
+
+ CHROOT_IN;
+ fd = open (path, O_WRONLY);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return -1;
+ }
+
+ r = pwrite (fd, content, size, offset);
+ if (r == -1) {
+ reply_with_perror ("pwrite: %s", path);
+ close (fd);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ close (fd);
+ return -1;
+ }
+
+ return r;
+}
+
+/* This runs the 'file' command. */
+char *
+do_file (const char *path)
+{
+ char *buf = NULL;
+ const char *display_path = path;
+
+ int is_dev = STRPREFIX (path, "/dev/");
+
+ if (!is_dev) {