termios::Termios::OutputModes does not expost some const for apple & musl

Just an example rustix's CR1 is missing from apple: https://docs.rs/rustix/latest/src/rustix/termios/types.rs.html#321 .
But nix does: https://github.com/nix-rust/nix/blob/3eae6d68ec6382fef7b38cd58f97458e59a71af9/src/sys/termios.rs#L502 .
misl: https://docs.rs/rustix/latest/src/rustix/termios/types.rs.html#371 . But nix has it: https://github.com/nix-rust/nix/blob/3eae6d68ec6382fef7b38cd58f97458e59a71af9/src/sys/termios.rs#L540 .

It should be exist because Linux kernel itself has support of it.

It seems OLCUC does not exist in the libc crate for Apple targets, we should check whether it exists in the Apple headers.

While some investigation for macOS is needed, this issue is still open for musl.

https://github.com/search?q=org%3Aapple-oss-distributions+OLCUC&type=code

It doesn't exist in termios.h:

cat $(xcrun --show-sdk-path)/usr/include/sys/termios.h | grep OLCUC

@oech3

@oech3 This issue does not apply to Apple targets, as OLCUC is not defined in Apple's headers. Please update the issue title and description.

I'd like to wait maintainer's response. Kernel itself still might have something (or just an spare of NCCS).

We shouldn't claim that a constant is missing without evidence that the platform is expected to define it. Please ensure the title and description accurately reflect the platforms affected by this issue.

We can say inverse things. Missing from header does not mean kernel does not support theorically.

OLCUC is not defined in XNU, Apple's open-source kernel:

https://github.com/apple-oss-distributions/xnu/blob/main/bsd/sys/termios.h

To make this more practical, OLCUC is not defined in the libc crate for Apple targets, so it cannot currently be implemented in rustix. If you believe this constant should be available, please consider opening an issue upstream with supporting evidence.

I updated this issue.

OLCUC is not defined in the libc

Well... but it actually compiles...

error[E0425]: cannot find value `OLCUC` in module `c`
   --> src/termios/types.rs:331:26
    |
331 |         const OLCUC = c::OLCUC;
    |                          ^^^^^ not found in `c`

But CI complied it.

OLCUC is not defined in the libc crate for Apple targets, so it cannot be implemented in rustix without an upstream definition. You can verify this by removing the apple exclusion from the conditional compilation attributes and running cargo check for an Apple target:

--- a/src/termios/types.rs
+++ b/src/termios/types.rs
@@ -320,7 +320,6 @@ bitflags! {
 
         /// `OLCUC`
         #[cfg(not(any(
-            apple,
             freebsdlike,
             target_os = "aix",
             target_os = "netbsd",

$ cargo check --features=all-apis --target aarch64-apple-darwin
error[E0425]: cannot find value `OLCUC` in module `c`

If you believe OLCUC is supported on Apple targets, please consider opening an issue upstream with supporting evidence.

I understood that source code is properly gated ,but CI compiled it.

https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/bsd/sys/termios.h#L149 says
Begin unimplemented features. But const seems given. Though they might be compiled out at most cases...

programs will currently result in unexpected behaviour.

Considering uutils/coreutils#15417 (comment) , we can request to support them.
However, they are probably useful only for uutils and it might no worth to add to rustix which should be "safe".

Regarding POSIX, OLCUC was removed in Issue 6 (2004):

https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html#:~:text=The%20LEGACY%20symbols%20IUCLC%2C%20OLCUC%2C%20and%20XCASE%20are%20removed

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termios::Termios::OutputModes does not expost some const for apple & musl #1706

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termios::Termios::OutputModes does not expost some const for apple & musl #1706

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xtqqczze commented on Oct 15, 2026

oech3 commented on Oct 15, 2026

oech3 commented on Oct 15, 2026

xtqqczze commented on Oct 15, 2026

xtqqczze commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

oech3 commented on Oct 16, 2026

xtqqczze commented on Oct 16, 2026

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