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fix(android/aarch64): use libc::ucontext_t from Android NDK #5189

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fix(android/aarch64): use libc::ucontext_t from Android NDK #5189

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2 changes: 1 addition & 1 deletion src/unix/linux_like/android/b32/arm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ s! {

pub struct __c_anonymous_uc_sigmask_with_padding {
pub uc_sigmask: crate::sigset_t,
/* Android has a wrong (smaller) sigset_t on x86. */
/* Android has a wrong (smaller) sigset_t on ARM. */
__padding_rt_sigset: Padding<u32>,
}

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3 changes: 3 additions & 0 deletions src/unix/linux_like/android/b64/aarch64/mod.rs
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Expand Up @@ -62,6 +62,9 @@ s! {
pub uc_link: *mut ucontext_t,
pub uc_stack: crate::stack_t,
pub uc_sigmask: crate::sigset_t,
/* The kernel adds extra padding after uc_sigmask to match
* glibc sigset_t on ARM64. */
__padding: Padding<[c_char; 128 - size_of::<crate::sigset_t>()]>,

@teor2345 teor2345 Jun 25, 2026 •
edited by rustbot
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Why is this subtracting sigset_t (32 bit?), but the comment refers to ARM64?

This calculation seems weird for either 32-bit or 64-bit, and might need further comments:

  • the union is the size of sigset64_t (assuming it's bigger) but we subtract sigset_t (the 32-bit size) from the padding

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@StackOverflowExcept1on StackOverflowExcept1on Jun 25, 2026

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https://android.googlesource.com/platform/bionic/+/refs/tags/ndk-r29/libc/include/sys/ucontext.h#102
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pub uc_mcontext: mcontext_t,
}

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