Add GNU/Hurd support

Author: sthibaul

.github/workflows/main.yml

@@ -71,7 +71,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        target: ["armv7-sony-vita-newlibeabihf"]
+        target: ["armv7-sony-vita-newlibeabihf", "i386-unknown-hurd-gnu"]
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@nightly
@@ -108,7 +108,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        target: ["armv7-sony-vita-newlibeabihf"]
+        target: ["armv7-sony-vita-newlibeabihf", "i386-unknown-hurd-gnu"]
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@nightly # NOTE: need nightly for `doc_cfg` feature.

src/socket.rs

@@ -1307,6 +1307,7 @@ impl Socket {
     #[cfg(not(any(
         target_os = "dragonfly",
         target_os = "haiku",
+        target_os = "hurd",
         target_os = "netbsd",
         target_os = "openbsd",
         target_os = "redox",
@@ -1344,6 +1345,7 @@ impl Socket {
     #[cfg(not(any(
         target_os = "dragonfly",
         target_os = "haiku",
+        target_os = "hurd",
         target_os = "netbsd",
         target_os = "openbsd",
         target_os = "redox",
@@ -1521,6 +1523,7 @@ impl Socket {
         target_os = "aix",
         target_os = "dragonfly",
         target_os = "fuchsia",
+        target_os = "hurd",
         target_os = "illumos",
         target_os = "netbsd",
         target_os = "openbsd",
@@ -1551,6 +1554,7 @@ impl Socket {
         target_os = "aix",
         target_os = "dragonfly",
         target_os = "fuchsia",
+        target_os = "hurd",
         target_os = "illumos",
         target_os = "netbsd",
         target_os = "openbsd",

src/sys/unix.rs

@@ -121,6 +121,7 @@ pub(crate) use libc::ipv6_mreq as Ipv6Mreq;
 #[cfg(not(any(
     target_os = "dragonfly",
     target_os = "fuchsia",
+    target_os = "hurd",
     target_os = "illumos",
     target_os = "netbsd",
     target_os = "openbsd",
@@ -179,6 +180,7 @@ pub(crate) use libc::{
 #[cfg(not(any(
     target_os = "dragonfly",
     target_os = "haiku",
+    target_os = "hurd",
     target_os = "netbsd",
     target_os = "openbsd",
     target_os = "redox",
@@ -329,6 +331,7 @@ type IovLen = usize;
     target_os = "freebsd",
     target_os = "fuchsia",
     target_os = "haiku",
+    target_os = "hurd",
     target_os = "illumos",
     target_os = "ios",
     target_os = "macos",