diff --git a/libc-test/semver/linux.txt b/libc-test/semver/linux.txt
index 3d1c73dca9ef0..385d1143774c9 100644
--- a/libc-test/semver/linux.txt
+++ b/libc-test/semver/linux.txt
@@ -4410,6 +4410,11 @@ regmatch_t
 regoff_t
 remap_file_pages
 removexattr
+res_mkquery
+res_query
+res_querydomain
+res_search
+res_send
 rlim64_t
 rlimit64
 rtentry
diff --git a/src/unix/linux_like/mod.rs b/src/unix/linux_like/mod.rs
index 172e44111e455..97c817dcc154f 100644
--- a/src/unix/linux_like/mod.rs
+++ b/src/unix/linux_like/mod.rs
@@ -1262,6 +1262,11 @@ pub const PIPE_BUF: usize = 4096;
 
 pub const SI_LOAD_SHIFT: c_uint = 16;
 
+// arpa/nameser.h
+pub const T_A: c_int = 1;
+pub const T_CNAME: c_int = 5;
+pub const C_IN: c_int = 1;
+
 // si_code values
 pub const SI_USER: c_int = 0;
 pub const SI_KERNEL: c_int = 0x80;
@@ -2101,6 +2106,47 @@ extern "C" {
         buflen: size_t,
         result: *mut *mut passwd,
     ) -> c_int;
+
+    // <resolv.h>
+    pub fn res_query(
+        dname: *const c_char,
+        class: c_int,
+        kind: c_int,
+        answer: *mut c_uchar,
+        anslen: c_int,
+    ) -> c_int;
+    pub fn res_search(
+        dname: *const c_char,
+        class: c_int,
+        kind: c_int,
+        answer: *mut c_uchar,
+        anslen: c_int,
+    ) -> c_int;
+    pub fn res_querydomain(
+        name: *const c_char,
+        domain: *const c_char,
+        class: c_int,
+        kind: c_int,
+        answer: *mut c_uchar,
+        anslen: c_int,
+    ) -> c_int;
+    pub fn res_mkquery(
+        op: c_int,
+        dname: *const c_char,
+        class: c_int,
+        kind: c_int,
+        data: *const c_uchar,
+        datalen: c_int,
+        newrr: *const c_uchar,
+        buf: *mut c_uchar,
+        buflen: c_int,
+    ) -> c_int;
+    pub fn res_send(
+        msg: *const c_uchar,
+        msglen: c_int,
+        answer: *mut c_uchar,
+        anslen: c_int,
+    ) -> c_int;
 }
 
 // LFS64 extensions