RTEMS | termios: Handle B0 baud rate in tcsetattr (!1564)

[Joel Sherrill (@joel)]

Merge request https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564 was reviewed by Joel Sherrill

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Joel Sherrill started a new discussion on cpukit/libcsupport/src/termios.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564#note_162097

 >      case TIOCSETAW:
 >      case TIOCSETAF:
 > +      if ( cfgetospeed( (struct termios *) args->buffer ) == B0 ) {

A comment above this about why B0 isn't supported would be nice.

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Joel Sherrill started a new discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564#note_162098


The methods impacted by this need a note added in the POSIX Users Guide. This is the [URL](https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html) for one method's documentation.

You can resolve this by creating an issue to update those and follow up from here to fix that.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564
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