glibc/sysdeps/unix/sysv/linux/mips
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 linux: implement arbitrary and split speeds in termios 2025-06-17 09:11:38 -03:00
mips32 termios: add new baud_t interface, defined to be explicitly numeric 2025-06-17 09:11:38 -03:00
mips64 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 elf: Do not change stack permission on dlopen/dlmopen 2024-12-31 09:04:20 -03:00
Versions linux: implement arbitrary and split speeds in termios 2025-06-17 09:11:38 -03:00
____longjmp_chk.c Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
_test_and_set.c Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
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configure Convert to autoconf 2.72 (vanilla release, no distribution patches) 2024-06-17 21:15:28 +02:00
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kernel_rt_sigframe.h
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mmap_info.h
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struct_kernel_msqid64_ds.h
struct_kernel_semid64_ds.h
struct_kernel_shmid64_ds.h
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syscalls.list
sysdep.h Update copyright dates with scripts/update-copyrights 2025-01-01 11:22:09 -08:00
termios_arch.h linux: implement arbitrary and split speeds in termios 2025-06-17 09:11:38 -03:00
ucontext_i.sym
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xstatver.h