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std.Io.Threaded: add procfs fallback for fileHardLink

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oof what a clunky set of functionality we have here
This commit is contained in:
Andrew Kelley 2026-01-06 23:08:59 -08:00
parent 7e8c7e5696
commit 1ddae8585a
2 changed files with 12 additions and 3 deletions
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2
lib/std/Io/File/Atomic.zig
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@ -37,7 +37,7 @@ pub fn deinit(af: *Atomic, io: Io) void {
af.* = undefined;
}
pub const LinkError = Dir.HardLinkError || Dir.RenamePreserveError;
pub const LinkError = File.HardLinkError || Dir.RenamePreserveError;
/// Atomically materializes the file into place, failing with
/// `error.PathAlreadyExists` if something already exists there.

13
lib/std/Io/Threaded.zig
View file

@ -3525,7 +3525,7 @@ fn dirCreateFileAtomic(
if (dest_dirname) |dirname| {
// This has a nice side effect of preemptively triggering EISDIR or
// ENOENT, avoiding the ambiguity below.
dir.createDirPath(t_io, dirname) catch |err| switch (err) {
if (options.make_path) dir.createDirPath(t_io, dirname) catch |err| switch (err) {
// None of these make sense in this context.
error.IsDir,
error.Streaming,
@ -5254,7 +5254,16 @@ fn fileHardLink(
else
posix.AT.EMPTY_PATH;
return linkat(file.handle, "", new_dir.handle, new_sub_path_posix, flags);
return linkat(file.handle, "", new_dir.handle, new_sub_path_posix, flags) catch |err| switch (err) {
error.FileNotFound => {
if (options.follow_symlinks) return error.FileNotFound;
var proc_buf: ["/proc/self/fd/-2147483648\x00".len]u8 = undefined;
const proc_path = std.fmt.bufPrintSentinel(&proc_buf, "/proc/self/fd/{d}", .{file.handle}, 0) catch
unreachable;
return linkat(posix.AT.FDCWD, proc_path, new_dir.handle, new_sub_path_posix, posix.AT.SYMLINK_FOLLOW);
},
else => |e| return e,
};
}
fn linkat(