Add sendmsg stub

build.rs

@@ -16,9 +16,7 @@ fn main() {
 
     let mut cc_builder = &mut cc::Build::new();
 
-    cc_builder = cc_builder
-        .flag("-nostdinc")
-        .flag("-nostdlib");
+    cc_builder = cc_builder.flag("-nostdinc").flag("-nostdlib");
 
     if target.starts_with("aarch64") {
         cc_builder = cc_builder.flag("-mno-outline-atomics")

src/header/sys_socket/cbindgen.toml

@@ -1,4 +1,4 @@
-sys_includes = ["stddef.h", "stdint.h", "sys/types.h"]
+sys_includes = ["stddef.h", "stdint.h", "sys/types.h", "sys/uio.h"]
 include_guard = "_SYS_SOCKET_H"
 trailer = "#include <bits/sys/socket.h>"
 language = "C"

src/header/sys_socket/mod.rs

@@ -2,13 +2,27 @@
 
 use core::ptr;
 
-use crate::platform::{types::*, PalSocket, Sys};
+use crate::{
+    header::sys_uio::iovec,
+    platform::{types::*, PalSocket, Sys},
+};
 
 pub mod constants;
 
 pub type sa_family_t = u16;
 pub type socklen_t = u32;
 
+#[repr(C)]
+pub struct msghdr {
+    pub msg_name: *mut c_void,
+    pub msg_namelen: socklen_t,
+    pub msg_iov: *mut iovec,
+    pub msg_iovlen: size_t,
+    pub msg_control: *mut c_void,
+    pub msg_controllen: size_t,
+    pub msg_flags: c_int,
+}
+
 #[repr(C)]
 #[derive(Default)]
 pub struct sockaddr {
@@ -163,6 +177,11 @@ pub unsafe extern "C" fn send(
     sendto(socket, message, length, flags, ptr::null(), 0)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t {
+    Sys::sendmsg(socket, msg, flags)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn sendto(
     socket: c_int,

src/platform/linux/socket.rs

@@ -2,7 +2,7 @@ use super::{
     super::{types::*, PalSocket},
     e, Sys,
 };
-use crate::header::sys_socket::{sockaddr, socklen_t};
+use crate::header::sys_socket::{msghdr, sockaddr, socklen_t};
 
 impl PalSocket for Sys {
     unsafe fn accept(socket: c_int, address: *mut sockaddr, address_len: *mut socklen_t) -> c_int {
@@ -75,6 +75,10 @@ impl PalSocket for Sys {
         )) as ssize_t
     }
 
+    unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t {
+        e(syscall!(SENDMSG, socket, msg, flags)) as ssize_t
+    }
+
     unsafe fn sendto(
         socket: c_int,
         buf: *const c_void,

src/platform/pal/socket.rs

@@ -1,5 +1,5 @@
 use super::super::{types::*, Pal};
-use crate::header::sys_socket::{sockaddr, socklen_t};
+use crate::header::sys_socket::{msghdr, sockaddr, socklen_t};
 
 pub trait PalSocket: Pal {
     unsafe fn accept(socket: c_int, address: *mut sockaddr, address_len: *mut socklen_t) -> c_int;
@@ -39,6 +39,8 @@ pub trait PalSocket: Pal {
         address_len: *mut socklen_t,
     ) -> ssize_t;
 
+    unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t;
+
     unsafe fn sendto(
         socket: c_int,
         buf: *const c_void,

src/platform/redox/socket.rs

@@ -10,7 +10,7 @@ use crate::header::{
     arpa_inet::inet_aton,
     netinet_in::{in_addr, in_port_t, sockaddr_in},
     string::strnlen,
-    sys_socket::{constants::*, sa_family_t, sockaddr, socklen_t},
+    sys_socket::{constants::*, msghdr, sa_family_t, sockaddr, socklen_t},
     sys_time::timeval,
     sys_un::sockaddr_un,
 };
@@ -316,6 +316,12 @@ impl PalSocket for Sys {
         }
     }
 
+    unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t {
+        eprintln!("sendmsg not implemented on redox");
+        errno = syscall::ENOSYS;
+        return -1;
+    }
+
     unsafe fn sendto(
         socket: c_int,
         buf: *const c_void,