From 5f138519ebdf88e1fc5395d65df0b780dd07829a Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin (Intel)" Date: Wed, 11 Jun 2025 18:35:42 -0700 Subject: 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) Reviewed-by: Adhemerval Zanella --- sysdeps/unix/sysv/linux/alpha/libc.abilist | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'sysdeps/unix/sysv/linux/alpha') diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 1e3f278..4b5736a 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -3099,9 +3099,14 @@ GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.42 __inet_ntop_chk F GLIBC_2.42 __inet_pton_chk F +GLIBC_2.42 cfgetibaud F GLIBC_2.42 cfgetispeed F +GLIBC_2.42 cfgetobaud F GLIBC_2.42 cfgetospeed F +GLIBC_2.42 cfsetbaud F +GLIBC_2.42 cfsetibaud F GLIBC_2.42 cfsetispeed F +GLIBC_2.42 cfsetobaud F GLIBC_2.42 cfsetospeed F GLIBC_2.42 cfsetspeed F GLIBC_2.42 pthread_gettid_np F -- cgit v1.1