Re: [RFC PATCH hurd 6/12] hurd: Fix modes_t and speeds_t types on 64-bit

[Sergey Bugaev]

On Sun, Feb 12, 2023 at 6:00 PM Samuel Thibault <samuel.thibault@gnu.org> wrote:
> We don't need these to be 64bits, 32bit will be completely large enough.
>
> Which issue did you actually encounter?

Well, these MIG definitions need to match the ones in C/glibc. In
hurd/ioctl_types.h (in the Hurd tree) there is

typedef tcflag_t modes_t[4];
typedef speed_t speeds_t[2];

and then in bits/termios.h (in the glibc tree)

/* Type of terminal control flag masks.  */
typedef unsigned long int tcflag_t;

/* Type of control characters.  */
typedef unsigned char cc_t;

/* Type of baud rate specifiers.  */
typedef long int speed_t;

which is why I changed the MIG ones to long. We could do it the other
way around, make our own bits/termios.h and define them as fixed-size
32 bit ints.

Sergey