Add support for alternative QNX Neutrino network stack io-sock

Signed-off-by: Florian Bartels <Florian.Bartels@elektrobit.com>

(backport <#4169>)
(cherry picked from commit f5bfa9f)

Author: flba-eb

libc-test/build.rs

@@ -3307,6 +3307,20 @@ fn test_neutrino(target: &str) {
     assert!(target.contains("nto-qnx"));
 
     let mut cfg = ctest_cfg();
+    if target.ends_with("_iosock") {
+        let qnx_target_val = std::env::var("QNX_TARGET")
+            .unwrap_or_else(|_| "QNX_TARGET_not_set_please_source_qnxsdp".into());
+
+        cfg.include(qnx_target_val + "/usr/include/io-sock");
+        headers! { cfg:
+            "io-sock.h",
+            "sys/types.h",
+            "sys/socket.h",
+            "sys/sysctl.h",
+            "net/if.h",
+            "net/if_arp.h"
+        }
+    }
 
     headers! { cfg:
         "ctype.h",
@@ -3464,6 +3478,9 @@ fn test_neutrino(target: &str) {
             // Does not exist in Neutrino
             "locale_t" => true,
 
+            // FIXME: "'__uint128' undeclared" in C
+            "__uint128" => true,
+
             _ => false,
         }
     });
@@ -3527,6 +3544,9 @@ fn test_neutrino(target: &str) {
             // stack unwinding bug.
             "__my_thread_exit" => true,
 
+            // Wrong const-ness
+            "dl_iterate_phdr" => true,
+
             _ => false,
         }
     });

src/unix/mod.rs

@@ -334,7 +334,13 @@ pub const ATF_PERM: c_int = 0x04;
 pub const ATF_PUBL: c_int = 0x08;
 pub const ATF_USETRAILERS: c_int = 0x10;
 
-pub const FNM_PERIOD: c_int = 1 << 2;
+cfg_if! {
+    if #[cfg(target_os = "nto")] {
+        pub const FNM_PERIOD: c_int = 1 << 1;
+    } else {
+        pub const FNM_PERIOD: c_int = 1 << 2;
+    }
+}
 pub const FNM_NOMATCH: c_int = 1;
 
 cfg_if! {
@@ -354,9 +360,22 @@ cfg_if! {
         target_os = "cygwin",
     ))] {
         pub const FNM_PATHNAME: c_int = 1 << 1;
-        pub const FNM_NOESCAPE: c_int = 1 << 0;
     } else {
         pub const FNM_PATHNAME: c_int = 1 << 0;
+    }
+}
+
+cfg_if! {
+    if #[cfg(any(
+        target_os = "macos",
+        target_os = "freebsd",
+        target_os = "android",
+        target_os = "openbsd",
+    ))] {
+        pub const FNM_NOESCAPE: c_int = 1 << 0;
+    } else if #[cfg(target_os = "nto")] {
+        pub const FNM_NOESCAPE: c_int = 1 << 2;
+    } else {
         pub const FNM_NOESCAPE: c_int = 1 << 1;
     }
 }