Re: ldattach: struct termios

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Hello Karel,

thanks for your feedback.

On Wed, 26 Mar 2008 15:17:47, Karel Zak wrote:
> 1/ I cannot compile ldattach on ppc64, kernel-headers-2.6.24 (asm-powerpc/):
> 
>     In file included from ldattach.c:24:
>     /usr/include/asm/termbits.h:22: error: redefinition of 'struct termios'

Oh dear. #include hell.

>   Why we cannot use standard /usr/include/termios.h?

It doesn't provide the definition for termios2 I need. On my development
machine (openSUSE 10.3, x86 32 bit userland),
24 #include <termios.h>
produces:

ldattach.c:90: warning: ‘struct termios2’ declared inside parameter list
ldattach.c:90: warning: its scope is only this definition or
declaration, which is probably not what you want
ldattach.c: In function ‘tcgetattr2’:
ldattach.c:92: error: invalid application of ‘sizeof’ to incomplete type
‘struct termios2’
ldattach.c:92: error: array type has incomplete element type
ldattach.c:92: error: invalid application of ‘sizeof’ to incomplete type
‘struct termios2’
ldattach.c:92: error: invalid application of ‘sizeof’ to incomplete type
‘struct termios2’
[etc.]

I tried
24 #include <asm/termios.h>
too, which ends up barfing thusly:

In file included from /usr/include/asm/termios.h:7,
                 from ldattach.c:24:
/usr/include/asm-i386/termios.h:7: error: redefinition of ‘struct winsize’
/usr/include/asm-i386/termios.h:15: error: redefinition of ‘struct termio’

Directly #including <asm/termbits.h> was really the only way I found to
get the thing to compile here.

Looks like it's time for some heavy ifdeffery. Any quick ideas?

> 2/ I found that:
> 
>     asm-parisc/termbits.h  <-- has termios2
>     asm-parisc/ioctls.h    <-- doesn't have TCGETS2, TCSETS2, TCSETSW2, ...

Ugh.

>  it seems like a kernel bug. It also seems that we need to check for
>  termios2 independently on TCGETS2.

I don't think so. Without TCGETS2, I have no use for struct termios2
anyway, so I gain nothing by checking for its existence.

Thanks,
Tilman

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