Add arc4random and arc4random_buf to NuttX #4464
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* Declare `arc4random` and `arc4random_buf` as extern "C" functions in the NuttX module * Enable access to system-provided random number generation for NuttX targets * Aligns NuttX FFI with other Unix platforms that expose these functions This change allows Rust code targeting NuttX to use `arc4random` and `arc4random_buf` for secure random number generation, improving compatibility and feature parity with other targets.
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* Declare `arc4random` and `arc4random_buf` as extern "C" functions in the NuttX module * Enable access to system-provided random number generation for NuttX targets * Aligns NuttX FFI with other Unix platforms that expose these functions This change allows Rust code targeting NuttX to use `arc4random` and `arc4random_buf` for secure random number generation, improving compatibility and feature parity with other targets. (backport <rust-lang#4464>) (cherry picked from commit f8e4746)
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* Declare `arc4random` and `arc4random_buf` as extern "C" functions in the NuttX module * Enable access to system-provided random number generation for NuttX targets * Aligns NuttX FFI with other Unix platforms that expose these functions This change allows Rust code targeting NuttX to use `arc4random` and `arc4random_buf` for secure random number generation, improving compatibility and feature parity with other targets. (backport <rust-lang#4464>) (cherry picked from commit f8e4746)
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* Declare `arc4random` and `arc4random_buf` as extern "C" functions in the NuttX module * Enable access to system-provided random number generation for NuttX targets * Aligns NuttX FFI with other Unix platforms that expose these functions This change allows Rust code targeting NuttX to use `arc4random` and `arc4random_buf` for secure random number generation, improving compatibility and feature parity with other targets. (backport <rust-lang#4464>) (cherry picked from commit f8e4746)
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std: move NuttX to use arc4random for random number generation arc4random support in libc merged in rust-lang/libc#4464, so: * Move `target_os = "nuttx"` from unix_legacy to arc4random section * This aligns NuttX with other POSIX-compliant systems that support arc4random * Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.
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std: move NuttX to use arc4random for random number generation arc4random support in libc merged in rust-lang/libc#4464, so: * Move `target_os = "nuttx"` from unix_legacy to arc4random section * This aligns NuttX with other POSIX-compliant systems that support arc4random * Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.
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Rollup merge of #143776 - no1wudi:fix, r=tgross35 std: move NuttX to use arc4random for random number generation arc4random support in libc merged in rust-lang/libc#4464, so: * Move `target_os = "nuttx"` from unix_legacy to arc4random section * This aligns NuttX with other POSIX-compliant systems that support arc4random * Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.
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Jul 14, 2025
std: move NuttX to use arc4random for random number generation arc4random support in libc merged in rust-lang/libc#4464, so: * Move `target_os = "nuttx"` from unix_legacy to arc4random section * This aligns NuttX with other POSIX-compliant systems that support arc4random * Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.
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Description
arc4randomandarc4random_bufas extern "C" functions in the NuttX moduleThis change allows Rust code targeting NuttX to use
arc4randomandarc4random_buffor secure random number generation, improving compatibility and feature parity with other targets.Sources
https://github.com/apache/nuttx/blob/302ceb701b2d28ab16aa421e2dc5c70ec0dd594e/include/stdlib.h#L155-L156
@rustbot label +stable-nominated
Checklist
libc-test/semverhave been updated*LASTor*MAXareincluded (see #3131)
cd libc-test && cargo test --target mytarget);especially relevant for platforms that may not be checked in CI