Added epoll and eventfd for Android

ci/ci.sh

@@ -154,7 +154,7 @@ case $HOST_TARGET in
     TEST_TARGET=i686-unknown-freebsd   run_tests_minimal $BASIC $UNIX time hashmap random threadname pthread fs libc-pipe
     TEST_TARGET=x86_64-unknown-illumos run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe
     TEST_TARGET=x86_64-pc-solaris      run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe
-    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap random sync threadname pthread
+    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap random sync threadname pthread epoll eventfd
     TEST_TARGET=wasm32-wasip2          run_tests_minimal $BASIC wasm
     TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std empty_main wasm # this target doesn't really have std
     TEST_TARGET=thumbv7em-none-eabihf  run_tests_minimal no_std

src/shims/unix/android/foreign_items.rs

@@ -2,7 +2,9 @@ use rustc_abi::ExternAbi;
 use rustc_span::Symbol;
 
 use crate::shims::unix::android::thread::prctl;
-use crate::shims::unix::linux::syscall::syscall;
+use crate::shims::unix::linux_like::epoll::EvalContextExt as _;
+use crate::shims::unix::linux_like::eventfd::EvalContextExt as _;
+use crate::shims::unix::linux_like::syscall::syscall;
 use crate::*;
 
 pub fn is_dyn_sym(_name: &str) -> bool {
@@ -20,6 +22,31 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     ) -> InterpResult<'tcx, EmulateItemResult> {
         let this = self.eval_context_mut();
         match link_name.as_str() {
+            // epoll, eventfd
+            "epoll_create1" => {
+                let [flag] =
+                    this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
+                let result = this.epoll_create1(flag)?;
+                this.write_scalar(result, dest)?;
+            }
+            "epoll_ctl" => {
+                let [epfd, op, fd, event] =
+                    this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
+                let result = this.epoll_ctl(epfd, op, fd, event)?;
+                this.write_scalar(result, dest)?;
+            }
+            "epoll_wait" => {
+                let [epfd, events, maxevents, timeout] =
+                    this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
+                this.epoll_wait(epfd, events, maxevents, timeout, dest)?;
+            }
+            "eventfd" => {
+                let [val, flag] =
+                    this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
+                let result = this.eventfd(val, flag)?;
+                this.write_scalar(result, dest)?;
+            }
+
             // Miscellaneous
             "__errno" => {
                 let [] = this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;

src/shims/unix/fd.rs

@@ -10,7 +10,7 @@ use std::rc::{Rc, Weak};
 use rustc_abi::Size;
 
 use crate::helpers::check_min_arg_count;
-use crate::shims::unix::linux::epoll::EpollReadyEvents;
+use crate::shims::unix::linux_like::epoll::EpollReadyEvents;
 use crate::shims::unix::*;
 use crate::*;
 

src/shims/unix/linux/foreign_items.rs

@@ -1,10 +1,10 @@
 use rustc_abi::ExternAbi;
 use rustc_span::Symbol;
 
-use self::shims::unix::linux::epoll::EvalContextExt as _;
-use self::shims::unix::linux::eventfd::EvalContextExt as _;
 use self::shims::unix::linux::mem::EvalContextExt as _;
-use self::shims::unix::linux::syscall::syscall;
+use self::shims::unix::linux_like::epoll::EvalContextExt as _;
+use self::shims::unix::linux_like::eventfd::EvalContextExt as _;
+use self::shims::unix::linux_like::syscall::syscall;
 use crate::machine::{SIGRTMAX, SIGRTMIN};
 use crate::shims::unix::*;
 use crate::*;

src/shims/unix/linux/mod.rs

@@ -1,6 +1,2 @@
-pub mod epoll;
-pub mod eventfd;
 pub mod foreign_items;
 pub mod mem;
-pub mod sync;
-pub mod syscall;

src/shims/unix/linux/eventfd.rs → src/shims/unix/linux_like/eventfd.rs

@@ -5,7 +5,7 @@ use std::io::ErrorKind;
 
 use crate::concurrency::VClock;
 use crate::shims::unix::fd::{FileDescriptionRef, WeakFileDescriptionRef};
-use crate::shims::unix::linux::epoll::{EpollReadyEvents, EvalContextExt as _};
+use crate::shims::unix::linux_like::epoll::{EpollReadyEvents, EvalContextExt as _};
 use crate::shims::unix::*;
 use crate::*;
 
@@ -144,9 +144,6 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     fn eventfd(&mut self, val: &OpTy<'tcx>, flags: &OpTy<'tcx>) -> InterpResult<'tcx, Scalar> {
         let this = self.eval_context_mut();
 
-        // eventfd is Linux specific.
-        this.assert_target_os("linux", "eventfd");
-
         let val = this.read_scalar(val)?.to_u32()?;
         let mut flags = this.read_scalar(flags)?.to_i32()?;
 

src/shims/unix/linux_like/mod.rs

@@ -0,0 +1,4 @@
+pub mod epoll;
+pub mod eventfd;
+pub mod sync;
+pub mod syscall;

src/shims/unix/linux/syscall.rs → src/shims/unix/linux_like/syscall.rs

@@ -1,9 +1,9 @@
 use rustc_abi::ExternAbi;
 use rustc_span::Symbol;
 
-use self::shims::unix::linux::eventfd::EvalContextExt as _;
 use crate::helpers::check_min_arg_count;
-use crate::shims::unix::linux::sync::futex;
+use crate::shims::unix::linux_like::eventfd::EvalContextExt as _;
+use crate::shims::unix::linux_like::sync::futex;
 use crate::*;
 
 pub fn syscall<'tcx>(

src/shims/unix/mod.rs

@@ -11,14 +11,15 @@ mod unnamed_socket;
 mod android;
 mod freebsd;
 mod linux;
+mod linux_like;
 mod macos;
 mod solarish;
 
 // All the Unix-specific extension traits
 pub use self::env::{EvalContextExt as _, UnixEnvVars};
 pub use self::fd::{EvalContextExt as _, FdTable, FileDescription};
 pub use self::fs::{DirTable, EvalContextExt as _};
-pub use self::linux::epoll::EpollInterestTable;
+pub use self::linux_like::epoll::EpollInterestTable;
 pub use self::mem::EvalContextExt as _;
 pub use self::sync::EvalContextExt as _;
 pub use self::thread::{EvalContextExt as _, ThreadNameResult};

src/shims/unix/unnamed_socket.rs

@@ -11,7 +11,7 @@ use rustc_abi::Size;
 
 use crate::concurrency::VClock;
 use crate::shims::unix::fd::{FileDescriptionRef, WeakFileDescriptionRef};
-use crate::shims::unix::linux::epoll::{EpollReadyEvents, EvalContextExt as _};
+use crate::shims::unix::linux_like::epoll::{EpollReadyEvents, EvalContextExt as _};
 use crate::shims::unix::*;
 use crate::*;
 

tests/fail-dep/libc/libc-epoll-data-race.rs

@@ -2,7 +2,7 @@
 //! and we only read one of them, we do not synchronize with the other events
 //! and therefore still report a data race for things that need to see the second event
 //! to be considered synchronized.
-//@only-target: linux
+//@only-target: linux android
 // ensure deterministic schedule
 //@compile-flags: -Zmiri-preemption-rate=0
 

tests/pass-dep/libc/libc-epoll-blocking.rs

@@ -1,4 +1,4 @@
-//@only-target: linux
+//@only-target: linux android
 // test_epoll_block_then_unblock and test_epoll_race depend on a deterministic schedule.
 //@compile-flags: -Zmiri-preemption-rate=0
 

tests/pass-dep/libc/libc-epoll-no-blocking.rs

@@ -1,4 +1,4 @@
-//@only-target: linux
+//@only-target: linux android
 
 use std::convert::TryInto;
 

tests/pass-dep/libc/libc-eventfd.rs

@@ -1,4 +1,4 @@
-//@only-target: linux
+//@only-target: linux android
 // test_race, test_blocking_read and test_blocking_write depend on a deterministic schedule.
 //@compile-flags: -Zmiri-preemption-rate=0