From 8c7ba8334132dda2c3e85cfe8fb7aae6f486dc3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antti=20Ker=C3=A4nen?= <detegr@gmail.com>
Date: Fri, 2 Mar 2018 20:09:37 +0200
Subject: [PATCH] Change SigAction::flags to use from_bits_truncated

On Linux, if the signal trampoline code is in the C library, sigaction
sets the SA_RESTORER flag (0x04000000) in the sa_flags field of old
sigaction (see sigreturn(2)).

This is not intended for application use and is missing from SaFlags,
therefore from_bits fails and unwrapping panics the user program.

This fix just drops the bits that are not defined in SaFlags.
---
 src/sys/signal.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sys/signal.rs b/src/sys/signal.rs
index 10798ba1c9..875f5de6e6 100644
--- a/src/sys/signal.rs
+++ b/src/sys/signal.rs
@@ -389,7 +389,7 @@ impl SigAction {
     }
 
     pub fn flags(&self) -> SaFlags {
-        SaFlags::from_bits(self.sigaction.sa_flags).unwrap()
+        SaFlags::from_bits_truncate(self.sigaction.sa_flags)
     }
 
     pub fn mask(&self) -> SigSet {