glibc/sysdeps/unix/sysv/linux/m68k
H. Peter Anvin (Intel) 5f138519eb termios: add new baud_t interface, defined to be explicitly numeric
Add an explicitly numeric interface for baudrate setting. For glibc,
this only announces what is a fair accompli, but this is a plausible
way forward for standardization, and may be possible to infill on
non-compliant systems. The POSIX committee has stated:

[https://www.austingroupbugs.net/view.php?id=1916#c7135]

	A future version of this standard is expected to add at least
	the following symbolic constants for use as values of objects
	of type speed_t: B57600, B115200, B230400, B460800, and
	B921600.

	Implementations are encouraged to propose additional
	interfaces which will make it possible to set and query a
	wider range of speeds than just those enumerated by the
	constants beginning with B. If a set of common interfaces
	emerges between several implementations, a future version of
	this standard will likely add those interfaces.

This is exactly that interface.

The use of the term "baud" is due to the need to have a term
contrasting "speed", and it is already well established as a legacy
term -- including in the names of the legacy Bxxx
constants. Futhermore, it *is* valid from the point of view that the
termios interface fundamentally emulates an RS-232 serial port as far
as the application software is concerned.

The documentation states that for the current version of glibc,
speed_t == baud_t, but explicitly declares that this may not be the
case in the future.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2025-06-17 09:11:38 -03:00
..
bits Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
coldfire termios: add new baud_t interface, defined to be explicitly numeric 2025-06-17 09:11:38 -03:00
m680x0 termios: add new baud_t interface, defined to be explicitly numeric 2025-06-17 09:11:38 -03:00
sys Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
Implies
Makefile Remove ldd libc4 support 2022-08-04 10:03:45 -03:00
Versions Linux: Move wordsize-32 Version to default 2023-02-20 10:19:25 -03:00
____longjmp_chk.c Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
arch-syscall.h Update syscall lists for Linux 6.15 2025-05-29 19:21:46 +00:00
c++-types.data
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kernel_sigaction.h
kernel_stat.h
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time64-compat.h
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xstatver.h