[uml-devel] Re: Bug#260111: user-mode-linux: upgrade hangs at "NET4: Linux TCP/IP 1.0 for NET4.0 "

[Matt Clay <mattclay@hevanet.com>]

Allen Chan wrote:
> After a little poking around, it appears that chan_kern.c and 
> chan_user.c have very different interpretations of what struct 
> termios should be . On my debian unstable system,

Now that you point it out, I see the same thing on my Slackware 10 system.

Here is the definition in my /usr/include/bits/termios.h

typedef unsigned char	cc_t;
typedef unsigned int	speed_t;
typedef unsigned int	tcflag_t;

#define NCCS 32
struct termios
   {
     tcflag_t c_iflag;		/* input mode flags */
     tcflag_t c_oflag;		/* output mode flags */
     tcflag_t c_cflag;		/* control mode flags */
     tcflag_t c_lflag;		/* local mode flags */
     cc_t c_line;			/* line discipline */
     cc_t c_cc[NCCS];		/* control characters */
     speed_t c_ispeed;		/* input speed */
     speed_t c_ospeed;		/* output speed */
   };

And the one from um/include/asm/arch/termbits.h

typedef unsigned char	cc_t;
typedef unsigned int	speed_t;
typedef unsigned int	tcflag_t;

#define NCCS 19
struct termios {
	tcflag_t c_iflag;		/* input mode flags */
	tcflag_t c_oflag;		/* output mode flags */
	tcflag_t c_cflag;		/* control mode flags */
	tcflag_t c_lflag;		/* local mode flags */
	cc_t c_line;			/* line discipline */
	cc_t c_cc[NCCS];		/* control characters */
};

This would certainly explain the random behavior I've been seeing with calls 
to tcsetattr failing sometimes.

  - Matt


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