[PATCH v3 0/5] termios: improve manual, add SPEED|BAUD_MAX constants

[H. Peter Anvin]

Patches 1-3 are improvements to the termios documentation; no
functional change.

Patch 4 adds the constants SPEED_MAX and BAUD_MAX, containing the
maximum valid values for speed_t and baud_t, respectively.  The need
for these constants became clear when I worked on an infill library
for the baud_t interface for non-glibc and retro-glibc platforms.

The intent is for these constants to be included in the proposal to
the POSIX committee to standardize the baud_t interface.

On *some* platforms, including glibc/Linux, the former was defined as
__MAX_BAUD, which I carried over to other platforms in my termios
enabling patches.  However, it is rather confusing since it is called
"baud" while referring to speed_t.

Patch 5 documents these new constants and their semantics in the
manual.  No functional change.

Git tree:
	https://git.zytor.com/linux/glibc hpa/termios-manual

[ v2: remove a stray chunk in patch 3/5 left from editing ]

[ v3: dropped leading underscores, leave __MAX_BAUD outside
      #ifdef __USE_MISC since it is a legacy symbol, and
      namespace-protected with a double underscore.
      (Collin Funk, Adhermerval Zanella Netto) ]

--- 
 bits/termios-baud.h  |   5 +-
 manual/terminal.texi | 439 +++++++++++++++++++++++++++++++++++----------------
 termios/termios.h    |   1 +
 3 files changed, 305 insertions(+), 140 deletions(-)