From e395c24c6dc4b8ad7688c1ad7754697166551bcb Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Thu, 14 Aug 2025 12:33:59 -0700
Subject: [PATCH] std.fs.File.Reader: fix freestanding build failures

This should be enough to unblock people for now. We'll revisit the way
these things are organized with the upcoming std.Io interface.

fixes #24685
---
 lib/std/fs/File.zig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/std/fs/File.zig b/lib/std/fs/File.zig
index 08dc00de8f..d9879e1e74 100644
--- a/lib/std/fs/File.zig
+++ b/lib/std/fs/File.zig
@@ -1214,6 +1214,10 @@ pub const Reader = struct {
                     return err;
                 }
             }
+            if (posix.Stat == void) {
+                r.size_err = error.Streaming;
+                return error.Streaming;
+            }
             if (stat(r.file)) |st| {
                 if (st.kind == .file) {
                     r.size = st.size;
@@ -1236,6 +1240,10 @@ pub const Reader = struct {
                 setPosAdjustingBuffer(r, @intCast(@as(i64, @intCast(r.pos)) + offset));
             },
             .streaming, .streaming_reading => {
+                if (posix.SEEK == void) {
+                    r.seek_err = error.Unseekable;
+                    return error.Unseekable;
+                }
                 const seek_err = r.seek_err orelse e: {
                     if (posix.lseek_CUR(r.file.handle, offset)) |_| {
                         setPosAdjustingBuffer(r, @intCast(@as(i64, @intCast(r.pos)) + offset));