From 049025306aa9e04f82cbc5365c8c71cb72d284d3 Mon Sep 17 00:00:00 2001
From: Cris Sinnott <cris.sinnott@gmail.com>
Date: Wed, 11 Nov 2026 14:27:42 -0500
Subject: [PATCH] Add QNX (target_os = "qnx") support to use_file backend

QNX systems support a custom target triple `x86_64-pc-qnx` where
target_os is "qnx" (distinct from the existing "nto" used by the
standard `x86_64-pc-nto-qnx8.0.0` triple).

Both "nto" and "qnx" refer to QNX operating systems and use the same
APIs: /dev/urandom for randomness and libc::__get_errno_ptr for errno.

Changes:
- backends.rs: add target_os = "qnx" to the use_file backend cfg block
- utils/get_errno.rs: add target_os = "qnx" to the __get_errno_ptr branch
- Cargo.toml: add target_os = "qnx" to the use_file libc dependency cfg
---
 Cargo.toml             | 2 +-
 src/backends.rs        | 1 +
 src/utils/get_errno.rs | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index af064432..6f5e7302 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -73,7 +73,7 @@ libc = { version = "0.2.176", default-features = false }
 libc = { version = "0.2.190", default-features = false }
 
 # use_file
-[target.'cfg(any(target_os = "haiku", target_os = "nto", target_os = "aix"))'.dependencies]
+[target.'cfg(any(target_os = "haiku", target_os = "nto", target_os = "qnx", target_os = "aix"))'.dependencies]
 libc = { version = "0.2.176", default-features = false }
 
 # vxworks
diff --git a/src/backends.rs b/src/backends.rs
index d644ab62..d1a70bde 100644
--- a/src/backends.rs
+++ b/src/backends.rs
@@ -44,6 +44,7 @@ cfg_if! {
     } else if #[cfg(any(
         target_os = "haiku",
         target_os = "nto",
+        target_os = "qnx",
         target_os = "aix",
     ))] {
         mod use_file;
diff --git a/src/utils/get_errno.rs b/src/utils/get_errno.rs
index 2c68ef9e..5fbe185e 100644
--- a/src/utils/get_errno.rs
+++ b/src/utils/get_errno.rs
@@ -9,7 +9,7 @@ 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")] {
+    } else if #[cfg(any(target_os = "nto", target_os = "qnx"))] {
         use libc::__get_errno_ptr as errno_location;
     } else if #[cfg(any(all(target_os = "horizon", target_arch = "arm"), target_os = "vita"))] {
         unsafe extern "C" {