[v3] ioctl_tty.2: Fix information about header include file

  Header file termios.h contains incompatible definitions for linux ioctl
calls. Correct definitions are exported by header file linux/termios.h but
this file conflicts with sys/ioctl.h header file (required for ioctl()
call). Therefore include direct asm header file asm/termbits.h which
contains compatible definitions and structures for ioctl calls.

Signed-off-by: Pali Rohár <pali@kernel.org>

---
Changes in v3:
* Use .I <file> instead of .B #include <file>
* Use Bnnn instead of Bnn

Changes in v2:
* Reformat SYNOPSIS for 80 chars per line
---
 man2/ioctl_tty.2 | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)
  

On Tuesday 31 August 2021 22:28:09 Pali Rohár wrote:
> Header file termios.h contains incompatible definitions for linux ioctl
> calls. Correct definitions are exported by header file linux/termios.h but
> this file conflicts with sys/ioctl.h header file (required for ioctl()
> call). Therefore include direct asm header file asm/termbits.h which
> contains compatible definitions and structures for ioctl calls.
> 
> Signed-off-by: Pali Rohár <pali@kernel.org>

Hello Alejandro! Could you check also this patch?

> ---
> Changes in v3:
> * Use .I <file> instead of .B #include <file>
> * Use Bnnn instead of Bnn
> 
> Changes in v2:
> * Reformat SYNOPSIS for 80 chars per line
> ---
>  man2/ioctl_tty.2 | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
> index 186011ee7c33..7d866867c6bd 100644
> --- a/man2/ioctl_tty.2
> +++ b/man2/ioctl_tty.2
> @@ -11,8 +11,10 @@ ioctl_tty \- ioctls for terminals and serial lines
>  .SH SYNOPSIS
>  .nf
>  .B #include <sys/ioctl.h>
> -.BR "#include <termios.h>" "      /* Definition of " CLOCAL ", and"
> -.BR    "                             TC*" { FLUSH , ON , OFF "} constants */"
> +.BR "#include <asm/termbits.h>" "   /* Definition of " "struct termios" ,
> +.BR    "                               struct termios2" ", and"
> +.BR    "                               Bnnn" ", " BOTHER ", " CBAUD ", " CLOCAL ,
> +.BR    "                               TC*" { FLUSH , ON , OFF "} and other constants */"
>  .PP
>  .BI "int ioctl(int " fd ", int " cmd ", ...);"
>  .fi
> @@ -31,6 +33,19 @@ makes for nonportable programs.
>  Use the POSIX interface described in
>  .BR termios (3)
>  whenever possible.
> +.PP
> +Please note that
> +.B struct termios
> +from
> +.I <asm/termbits.h>
> +is different and incompatible with
> +.B struct termios
> +from
> +.IR <termios.h> .
> +These ioctl calls require
> +.B struct termios
> +from
> +.IR <asm/termbits.h> .
>  .SS Get and set terminal attributes
>  .TP
>  .B TCGETS
> -- 
> 2.20.1
>
  

Hi Pali,

On 9/10/21 7:39 PM, Pali Rohár wrote:
> On Tuesday 31 August 2021 22:28:09 Pali Rohár wrote:
>> Header file termios.h contains incompatible definitions for linux ioctl
>> calls. Correct definitions are exported by header file linux/termios.h but
>> this file conflicts with sys/ioctl.h header file (required for ioctl()
>> call). Therefore include direct asm header file asm/termbits.h which
>> contains compatible definitions and structures for ioctl calls.
>>
>> Signed-off-by: Pali Rohár <pali@kernel.org>
> 
> Hello Alejandro! Could you check also this patch?

Sure, patch applied!
BTW, if at some point you feel like adding entries for termios and 
termios2 into system_data_types(7), I'll be happy to merge those!!

Thank you!

Alex

> 
>> ---
>> Changes in v3:
>> * Use .I <file> instead of .B #include <file>
>> * Use Bnnn instead of Bnn
>>
>> Changes in v2:
>> * Reformat SYNOPSIS for 80 chars per line
>> ---
>>   man2/ioctl_tty.2 | 19 +++++++++++++++++--
>>   1 file changed, 17 insertions(+), 2 deletions(-)
>>
>> diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
>> index 186011ee7c33..7d866867c6bd 100644
>> --- a/man2/ioctl_tty.2
>> +++ b/man2/ioctl_tty.2
>> @@ -11,8 +11,10 @@ ioctl_tty \- ioctls for terminals and serial lines
>>   .SH SYNOPSIS
>>   .nf
>>   .B #include <sys/ioctl.h>
>> -.BR "#include <termios.h>" "      /* Definition of " CLOCAL ", and"
>> -.BR    "                             TC*" { FLUSH , ON , OFF "} constants */"
>> +.BR "#include <asm/termbits.h>" "   /* Definition of " "struct termios" ,
>> +.BR    "                               struct termios2" ", and"
>> +.BR    "                               Bnnn" ", " BOTHER ", " CBAUD ", " CLOCAL ,
>> +.BR    "                               TC*" { FLUSH , ON , OFF "} and other constants */"
>>   .PP
>>   .BI "int ioctl(int " fd ", int " cmd ", ...);"
>>   .fi
>> @@ -31,6 +33,19 @@ makes for nonportable programs.
>>   Use the POSIX interface described in
>>   .BR termios (3)
>>   whenever possible.
>> +.PP
>> +Please note that
>> +.B struct termios
>> +from
>> +.I <asm/termbits.h>
>> +is different and incompatible with
>> +.B struct termios
>> +from
>> +.IR <termios.h> .
>> +These ioctl calls require
>> +.B struct termios
>> +from
>> +.IR <asm/termbits.h> .
>>   .SS Get and set terminal attributes
>>   .TP
>>   .B TCGETS
>> -- 
>> 2.20.1
>>