Added emscripten _sysconf

src/apis/emscripten/env.rs

@@ -1,6 +1,6 @@
 use super::super::host;
 /// NOTE: These syscalls only support wasm_32 for now because they take u32 offset
-use libc::{c_int, getgrnam as libc_getgrnam, getpwnam as libc_getpwnam};
+use libc::{c_int, getgrnam as libc_getgrnam, getpwnam as libc_getpwnam, c_long, sysconf};
 use std::ffi::CStr;
 use std::mem;
 use std::os::raw::c_char;
@@ -110,3 +110,11 @@ pub extern "C" fn _getpagesize() -> u32 {
 pub extern "C" fn ___build_environment(environ: c_int) {
     debug!("emscripten::___build_environment {}", environ);
 }
+
+pub extern "C" fn _sysconf(name: c_int, instance: &mut Instance) -> c_long {
+    debug!("emscripten::_sysconf {}", name);
+    // TODO: Implement like emscripten expects regarding memory/page size
+    unsafe {
+        sysconf(name)
+    }
+}

src/apis/emscripten/mod.rs

@@ -409,12 +409,17 @@ pub fn generate_emscripten_env<'a, 'b>() -> ImportObject<&'a str, &'b str> {
         "_getpagesize",
         ImportValue::Func(env::_getpagesize as _),
     );
+    import_object.set(
+        "env",
+        "_sysconf",
+        ImportValue::Func(env::_sysconf as _),
+    );
 
     mock_external!(import_object, _waitpid);
     mock_external!(import_object, _utimes);
     mock_external!(import_object, _usleep);
     // mock_external!(import_object, _time);
-    mock_external!(import_object, _sysconf);
+    // mock_external!(import_object, _sysconf);
     // mock_external!(import_object, _strftime);
     mock_external!(import_object, _sigsuspend);
     // mock_external!(import_object, _sigprocmask);