linkat

fn linkat(
    old_dir: posix.fd_t,
    old_path: [*:0]const u8,
    new_dir: posix.fd_t,
    new_path: [*:0]const u8,
    flags: u32,
) File.HardLinkError!void {
    const syscall: Syscall = try .start();
    while (true) {
        switch (posix.errno(posix.system.linkat(old_dir, old_path, new_dir, new_path, flags))) {
            .SUCCESS => return syscall.finish(),
            .INTR => {
                try syscall.checkCancel();
                continue;
            },
            .ACCES => return syscall.fail(error.AccessDenied),
            .DQUOT => return syscall.fail(error.DiskQuota),
            .EXIST => return syscall.fail(error.PathAlreadyExists),
            .IO => return syscall.fail(error.HardwareFailure),
            .LOOP => return syscall.fail(error.SymLinkLoop),
            .MLINK => return syscall.fail(error.LinkQuotaExceeded),
            .NAMETOOLONG => return syscall.fail(error.NameTooLong),
            .NOENT => return syscall.fail(error.FileNotFound),
            .NOMEM => return syscall.fail(error.SystemResources),
            .NOSPC => return syscall.fail(error.NoSpaceLeft),
            .NOTDIR => return syscall.fail(error.NotDir),
            .PERM => return syscall.fail(error.PermissionDenied),
            .ROFS => return syscall.fail(error.ReadOnlyFileSystem),
            .XDEV => return syscall.fail(error.CrossDevice),
            .ILSEQ => return syscall.fail(error.BadPathName),
            .FAULT => |err| return syscall.errnoBug(err),
            .INVAL => |err| return syscall.errnoBug(err),
            else => |err| return syscall.unexpectedErrno(err),
        }
    }
}