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std.Io.Threaded: dirRealPathFilePosix use libc realpath sometimes

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When linking libc, and the directory is the cwd.

This avoids bugs on FreeBSD.
This commit is contained in:
Andrew Kelley 2025-12-24 12:57:18 -08:00
parent 02e560d9ef
commit 315bc10a0c
1 changed files with 31 additions and 0 deletions
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31
lib/std/Io/Threaded.zig
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@ -4085,6 +4085,37 @@ fn dirRealPathFilePosix(userdata: ?*anyopaque, dir: Dir, sub_path: []const u8, o
var path_buffer: [posix.PATH_MAX]u8 = undefined;
const sub_path_posix = try pathToPosix(sub_path, &path_buffer);
if (builtin.link_libc and dir.handle == posix.AT.FDCWD) {
if (out_buffer.len < posix.PATH_MAX) return error.NameTooLong;
try current_thread.beginSyscall();
while (true) {
if (std.c.realpath(sub_path_posix, out_buffer.ptr)) |redundant_pointer| {
current_thread.endSyscall();
assert(redundant_pointer == out_buffer.ptr);
return std.mem.indexOfScalar(u8, out_buffer, 0) orelse out_buffer.len;
}
const err: posix.E = @enumFromInt(std.c._errno().*);
if (err == .INTR) {
try current_thread.checkCancel();
continue;
}
current_thread.endSyscall();
switch (err) {
.INVAL => return errnoBug(err),
.BADF => return errnoBug(err),
.FAULT => return errnoBug(err),
.ACCES => return error.AccessDenied,
.NOENT => return error.FileNotFound,
.OPNOTSUPP => return error.OperationUnsupported,
.NOTDIR => return error.NotDir,
.NAMETOOLONG => return error.NameTooLong,
.LOOP => return error.SymLinkLoop,
.IO => return error.InputOutput,
else => return posix.unexpectedErrno(err),
}
}
}
var flags: posix.O = .{};
if (@hasField(posix.O, "NONBLOCK")) flags.NONBLOCK = true;
if (@hasField(posix.O, "CLOEXEC")) flags.CLOEXEC = true;