add __syscall42 (pipe)

lib/emscripten/emtests/test_pipe.c

@@ -0,0 +1,13 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    int mypipe[2];
+    printf("pipe\n");
+    if (pipe(mypipe)) {
+        printf("error\n");
+    }
+    return 0;
+}

lib/emscripten/emtests/test_pipe.out

@@ -0,0 +1 @@
+pipe

lib/emscripten/src/lib.rs

@@ -481,6 +481,7 @@ pub fn generate_emscripten_env(globals: &mut EmscriptenGlobals) -> ImportObject
             "___syscall39" => func!(crate::syscalls::___syscall39),
             "___syscall38" => func!(crate::syscalls::___syscall38),
             "___syscall40" => func!(crate::syscalls::___syscall40),
+            "___syscall42" => func!(crate::syscalls::___syscall42),
             "___syscall54" => func!(crate::syscalls::___syscall54),
             "___syscall57" => func!(crate::syscalls::___syscall57),
             "___syscall60" => func!(crate::syscalls::___syscall60),

lib/emscripten/src/syscalls/mod.rs

@@ -40,6 +40,7 @@ use libc::{
 use wasmer_runtime_core::vm::Ctx;
 
 use super::env;
+use std::cell::Cell;
 use std::slice;
 // use std::sys::fd::FileDesc;
 
@@ -140,6 +141,33 @@ pub fn ___syscall40(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_int
     unsafe { rmdir(pathname_addr) }
 }
 
+// pipe
+pub fn ___syscall42(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_int {
+    debug!("emscripten::___syscall42 (pipe)");
+    // offset to a file descriptor, which contains a read end and write end, 2 integers
+    let fd_offset: u32 = varargs.get(ctx);
+
+    use std::cell::Cell;
+    let emscripten_memory = ctx.memory(0);
+
+    // convert the file descriptor into a vec with two slots
+    let mut fd_vec: Vec<c_int> = emscripten_memory.view()[((fd_offset / 4) as usize)..]
+        .iter()
+        .map(|pipe_end: &Cell<c_int>| pipe_end.get())
+        .take(2)
+        .collect();
+
+    // get it as a mutable pointer
+    let fd_ptr = fd_vec.as_mut_ptr();
+
+    // call pipe and store the pointers in this array
+    #[cfg(target_os = "windows")]
+    let result: c_int = unsafe { libc::pipe(fd_ptr, 2048, 0) };
+    #[cfg(not(target_os = "windows"))]
+    let result: c_int = unsafe { libc::pipe(fd_ptr) };
+    result
+}
+
 pub fn ___syscall60(_ctx: &mut Ctx, _one: i32, _two: i32) -> i32 {
     debug!("emscripten::___syscall60");
     -1

lib/emscripten/tests/emtests/mod.rs

@@ -118,6 +118,7 @@ mod test_nested_struct_varargs;
 mod test_nl_types;
 mod test_perrar;
 mod test_phiundef;
+mod test_pipe;
 mod test_poll;
 mod test_posixtime;
 mod test_printf_2;

lib/emscripten/tests/emtests/test_pipe.rs

@@ -0,0 +1,8 @@
+use crate::emtests::_common::assert_emscripten_output;
+
+#[test]
+fn test_pipe() {
+    let wasm_bytes = include_bytes!("../../emtests/test_pipe.wasm");
+    let expected_str = include_str!("../../emtests/test_pipe.out");
+    assert_emscripten_output(wasm_bytes, expected_str);
+}