Declare utmpx on musl

libc-test/build.rs

@@ -2551,6 +2551,11 @@ fn test_linux(target: &str) {
             "statx" => true,
             "statx_timestamp" => true,
 
+            // On Linux, the type of `ut_exit` field of struct `utmpx`
+            // can be an anonymous struct, so an extra struct,
+            // which is absent in musl, has to be defined.
+            "__exit_status" if musl => true,
+
             _ => false,
         }
     });
@@ -2672,7 +2677,9 @@ fn test_linux(target: &str) {
         // sigval is actually a union, but we pretend it's a struct
         (struct_ == "sigevent" && field == "sigev_value") ||
         // this one is an anonymous union
-        (struct_ == "ff_effect" && field == "u")
+        (struct_ == "ff_effect" && field == "u") ||
+        // `__exit_status` type is a patch which is absent in musl
+        (struct_ == "utmpx" && field == "ut_exit" && musl)
     });
 
     cfg.volatile_item(|i| {

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -92,7 +92,7 @@ s! {
         pub st_spare: [u32; 2],
     }
 
-     pub struct addrinfo {
+    pub struct addrinfo {
         pub ai_flags: ::c_int,
         pub ai_family: ::c_int,
         pub ai_socktype: ::c_int,
@@ -286,7 +286,7 @@ s! {
     pub struct __exit_status {
         pub e_termination: u16,
         pub e_exit: u16,
-   }
+    }
 
     pub struct shmid_ds {
         pub shm_perm: ::ipc_perm,

src/unix/linux_like/linux/musl/mod.rs

@@ -144,6 +144,11 @@ s! {
         pub imr_address: ::in_addr,
         pub imr_ifindex: ::c_int,
     }
+
+    pub struct __exit_status {
+        pub e_termination: ::c_short,
+        pub e_exit: ::c_short,
+    }
 }
 
 s_no_extra_traits! {
@@ -163,6 +168,36 @@ s_no_extra_traits! {
         pub mem_unit: ::c_uint,
         pub __reserved: [::c_char; 256],
     }
+
+    // FIXME: musl added paddings and adjusted
+    // layout in 1.2.0 but our CI is still 1.1.24.
+    // So, I'm leaving some fields as comments for now.
+    // ref. https://github.com/bminor/musl/commit/
+    // 1e7f0fcd7ff2096904fd93a2ee6d12a2392be392
+    pub struct utmpx {
+        pub ut_type: ::c_short,
+        //__ut_pad1: ::c_short,
+        pub ut_pid: ::pid_t,
+        pub ut_line: [::c_char; 32],
+        pub ut_id: [::c_char; 4],
+        pub ut_user: [::c_char; 32],
+        pub ut_host: [::c_char; 256],
+        pub ut_exit: __exit_status,
+
+        //#[cfg(target_endian = "little")]
+        pub ut_session: ::c_long,
+        //#[cfg(target_endian = "little")]
+        //__ut_pad2: ::c_long,
+
+        //#[cfg(not(target_endian = "little"))]
+        //__ut_pad2: ::c_int,
+        //#[cfg(not(target_endian = "little"))]
+        //pub ut_session: ::c_int,
+
+        pub ut_tv: ::timeval,
+        pub ut_addr_v6: [::c_uint; 4],
+        __unused: [::c_char; 20],
+    }
 }
 
 cfg_if! {
@@ -231,6 +266,68 @@ cfg_if! {
                 self.__reserved.hash(state);
             }
         }
+
+        impl PartialEq for utmpx {
+            fn eq(&self, other: &utmpx) -> bool {
+                self.ut_type == other.ut_type
+                    //&& self.__ut_pad1 == other.__ut_pad1
+                    && self.ut_pid == other.ut_pid
+                    && self.ut_line == other.ut_line
+                    && self.ut_id == other.ut_id
+                    && self.ut_user == other.ut_user
+                    && self
+                        .ut_host
+                        .iter()
+                        .zip(other.ut_host.iter())
+                        .all(|(a,b)| a == b)
+                    && self.ut_exit == other.ut_exit
+                    && self.ut_session == other.ut_session
+                    //&& self.__ut_pad2 == other.__ut_pad2
+                    && self.ut_tv == other.ut_tv
+                    && self.ut_addr_v6 == other.ut_addr_v6
+                    && self.__unused == other.__unused
+            }
+        }
+
+        impl Eq for utmpx {}
+
+        impl ::fmt::Debug for utmpx {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("utmpx")
+                    .field("ut_type", &self.ut_type)
+                    //.field("__ut_pad1", &self.__ut_pad1)
+                    .field("ut_pid", &self.ut_pid)
+                    .field("ut_line", &self.ut_line)
+                    .field("ut_id", &self.ut_id)
+                    .field("ut_user", &self.ut_user)
+                    //FIXME: .field("ut_host", &self.ut_host)
+                    .field("ut_exit", &self.ut_exit)
+                    .field("ut_session", &self.ut_session)
+                    //.field("__ut_pad2", &self.__ut_pad2)
+                    .field("ut_tv", &self.ut_tv)
+                    .field("ut_addr_v6", &self.ut_addr_v6)
+                    .field("__unused", &self.__unused)
+                    .finish()
+            }
+        }
+
+        impl ::hash::Hash for utmpx {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.ut_type.hash(state);
+                //self.__ut_pad1.hash(state);
+                self.ut_pid.hash(state);
+                self.ut_line.hash(state);
+                self.ut_id.hash(state);
+                self.ut_user.hash(state);
+                self.ut_host.hash(state);
+                self.ut_exit.hash(state);
+                self.ut_session.hash(state);
+                //self.__ut_pad2.hash(state);
+                self.ut_tv.hash(state);
+                self.ut_addr_v6.hash(state);
+                self.__unused.hash(state);
+            }
+        }
     }
 }