Remove signalfd feature in favor of conditional compilation

Note that this is now only available for Linux as support is missing in libc
for Android (see rust-lang/libc#671).

As part of this work the SIGUSR2 signal mutex was altered to be a general
signal mutex. This is because all signal handling is shared across all threads
in the Rust test harness, so if you alter one signal, depending on whether it's
additive or may overwrite the mask for other signals, it could break the other
ones. Instead of putting this on the user, just broaden the scope of the mutex
so that any altering of signal handling needs to use it.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/sys/test_aio.rs b/test/sys/test_aio.rs
index 7e2bef63..54ee5a96 100644
--- a/test/sys/test_aio.rs
+++ b/test/sys/test_aio.rs
@@ -244,7 +244,7 @@ extern fn sigfunc(_: c_int) {
 #[cfg_attr(any(all(target_env = "musl", target_arch = "x86_64"), target_arch = "mips"), ignore)]
 fn test_write_sigev_signal() {
     #[allow(unused_variables)]
-    let m = ::SIGUSR2_MTX.lock().expect("Mutex got poisoned by another test");
+    let m = ::SIGNAL_MTX.lock().expect("Mutex got poisoned by another test");
     let sa = SigAction::new(SigHandler::Handler(sigfunc),
                             SA_RESETHAND,
                             SigSet::empty());
@@ -375,7 +375,7 @@ fn test_lio_listio_nowait() {
 #[cfg_attr(any(target_arch = "mips", target_env = "musl"), ignore)]
 fn test_lio_listio_signal() {
     #[allow(unused_variables)]
-    let m = ::SIGUSR2_MTX.lock().expect("Mutex got poisoned by another test");
+    let m = ::SIGNAL_MTX.lock().expect("Mutex got poisoned by another test");
     const INITIAL: &'static [u8] = b"abcdef123456";
     const WBUF: &'static [u8] = b"CDEF";
     let rbuf = Rc::new(vec![0; 4].into_boxed_slice());