From 7301eff5ba772deb13e60fe5ba7b5f640ea165a2 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Fri, 19 Dec 2025 12:18:21 -0700
Subject: [PATCH] Stub ifaddrs.h

---
 src/header/ifaddrs/cbindgen.toml | 12 ++++++++++
 src/header/ifaddrs/mod.rs        | 41 ++++++++++++++++++++++++++++++++
 src/header/mod.rs                |  1 +
 3 files changed, 54 insertions(+)
 create mode 100644 src/header/ifaddrs/cbindgen.toml
 create mode 100644 src/header/ifaddrs/mod.rs

diff --git a/src/header/ifaddrs/cbindgen.toml b/src/header/ifaddrs/cbindgen.toml
new file mode 100644
index 0000000000..1b9e3bfc65
--- /dev/null
+++ b/src/header/ifaddrs/cbindgen.toml
@@ -0,0 +1,12 @@
+sys_includes = ["features.h", "netinet/in.h", "sys/socket.h"]
+include_guard = "_RELIBC_IFADDRS_H"
+language = "C"
+style = "Tag"
+no_includes = true
+cpp_compat = true
+
+[export.rename]
+"sockaddr" = "struct sockaddr"
+
+[enum]
+prefix_with_name = true
diff --git a/src/header/ifaddrs/mod.rs b/src/header/ifaddrs/mod.rs
new file mode 100644
index 0000000000..3df9df0244
--- /dev/null
+++ b/src/header/ifaddrs/mod.rs
@@ -0,0 +1,41 @@
+//! `ifaddrs.h` implementation
+
+use core::ptr;
+
+use crate::{
+    header::{errno, stdlib, sys_socket::sockaddr},
+    platform::{self, types::*},
+};
+
+#[repr(C)]
+union ifaddrs_ifa_ifu {
+    ifu_broadaddr: *mut sockaddr,
+    ifu_dstaddr: *mut sockaddr,
+}
+
+#[repr(C)]
+pub struct ifaddrs {
+    ifa_next: *mut ifaddrs,
+    ifa_name: *mut c_char,
+    ifa_flags: c_uint,
+    ifa_addr: *mut sockaddr,
+    ifa_netmask: *mut sockaddr,
+    ifa_ifu: ifaddrs_ifa_ifu,
+    ifa_data: *mut c_void,
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn freeifaddrs(mut ifa: *mut ifaddrs) {
+    while !ifa.is_null() {
+        let next = (*ifa).ifa_next;
+        stdlib::free(ifa.cast());
+        ifa = next;
+    }
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn getifaddrs(ifap: *mut *mut ifaddrs) -> c_int {
+    //TODO: implement getifaddrs
+    platform::ERRNO.set(errno::ENOSYS);
+    -1
+}
diff --git a/src/header/mod.rs b/src/header/mod.rs
index fec4f937b9..c01b384ebc 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -29,6 +29,7 @@ pub mod getopt;
 pub mod glob;
 pub mod grp;
 // TODO: iconv.h
+pub mod ifaddrs;
 pub mod inttypes;
 // iso646.h implemented in C
 pub mod langinfo;