Add QNX/nto support

Author: flba-eb

src/lib.rs

@@ -33,6 +33,7 @@
 //! | Web Browser and Node.js | `wasm*‑*‑unknown` | [`Crypto.getRandomValues`] if available, then [`crypto.randomFillSync`] if on Node.js, see [WebAssembly support]
 //! | SOLID             | `*-kmc-solid_*`    | `SOLID_RNG_SampleRandomBytes`
 //! | Nintendo 3DS      | `armv6k-nintendo-3ds` | [`getrandom`][1]
+//! | QNX Neutrino      | `*‑nto-qnx*`          | `/dev/urandom` [Random on QNX][14]
 //!
 //! There is no blanket implementation on `unix` targets that reads from
 //! `/dev/urandom`. This ensures all supported targets are using the recommended
@@ -160,6 +161,7 @@
 //! [11]: https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html
 //! [12]: https://docs.oracle.com/cd/E86824_01/html/E54777/random-7d.html
 //! [13]: https://github.com/emscripten-core/emscripten/pull/12240
+//! [14]: https://www.qnx.com/developers/docs/7.1/index.html#com.qnx.doc.neutrino.utilities/topic/r/random.html
 //!
 //! [`BCryptGenRandom`]: https://docs.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptgenrandom
 //! [`Crypto.getRandomValues`]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
@@ -209,7 +211,7 @@ pub use crate::error::Error;
 // The function MUST NOT ever write uninitialized bytes into `dest`,
 // regardless of what value it returns.
 cfg_if! {
-    if #[cfg(any(target_os = "haiku", target_os = "redox"))] {
+    if #[cfg(any(target_os = "haiku", target_os = "redox", target_os = "nto"))] {
         mod util_libc;
         #[path = "use_file.rs"] mod imp;
     } else if #[cfg(any(target_os = "android", target_os = "linux"))] {

src/use_file.rs

@@ -30,7 +30,8 @@ const FILE_PATH: &str = "/dev/random\0";
     target_os = "redox",
     target_os = "dragonfly",
     target_os = "haiku",
-    target_os = "macos"
+    target_os = "macos",
+    target_os = "nto",
 ))]
 const FILE_PATH: &str = "/dev/urandom\0";
 

src/util_libc.rs

@@ -26,6 +26,8 @@ cfg_if! {
         use libc::__error as errno_location;
     } else if #[cfg(target_os = "haiku")] {
         use libc::_errnop as errno_location;
+    } else if #[cfg(target_os = "nto")] {
+        use libc::__get_errno_ptr as errno_location;
     } else if #[cfg(all(target_os = "horizon", target_arch = "arm"))] {
         extern "C" {
             // Not provided by libc: https://github.com/rust-lang/libc/issues/1995