Add getens and expose it to libredox

redox-rt/src/sys.rs

@@ -12,6 +12,7 @@ use syscall::{
 use crate::{
     arch::manually_enter_trampoline,
     protocol::{ProcCall, ProcKillTarget, RtSigInfo, ThreadCall, WaitFlags},
+    read_proc_meta,
     signal::tmp_disable_signals,
     DynamicProcInfo, RtTcb, Tcb, DYNAMIC_PROC_INFO,
 };
@@ -305,6 +306,9 @@ pub fn posix_getresugid() -> Resugid<u32> {
         sgid,
     }
 }
+pub fn getens() -> Result<usize> {
+    read_proc_meta(crate::current_proc_fd()).map(|meta| meta.ens as usize)
+}
 pub fn get_proc_credentials(cap_fd: usize, target_pid: usize, buf: &mut [u8]) -> Result<usize> {
     if buf.len() < size_of::<crate::protocol::ProcMeta>() {
         return Err(Error::new(EINVAL));

src/platform/redox/libredox.rs

@@ -243,6 +243,10 @@ pub unsafe extern "C" fn redox_get_rgid_v1() -> RawResult {
     redox_rt::sys::posix_getresugid().rgid as _
 }
 #[no_mangle]
+pub unsafe extern "C" fn redox_get_ens_v0() -> RawResult {
+    Error::mux(redox_rt::sys::getens())
+}
+#[no_mangle]
 pub unsafe extern "C" fn redox_get_proc_credentials_v1(
     cap_fd: usize,
     target_pid: usize,