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lib/emscripten/src/io/unix.rs

@@ -1,4 +1,7 @@
-use libc::{chroot as _chroot, printf as _printf};
+use std::mem;
+use libc::{chroot as _chroot, printf as _printf, getpwuid as _getpwuid};
+use super::super::utils::copy_cstr_into_wasm;
+use super::super::env::call_malloc;
 
 use wasmer_runtime_core::vm::Ctx;
 
@@ -24,7 +27,36 @@ pub fn chroot(ctx: &mut Ctx, name_ptr: i32) -> i32 {
 }
 
 /// getpwuid
-pub fn getpwuid(_ctx: &mut Ctx, _uid: i32) -> i32 {
+pub fn getpwuid(ctx: &mut Ctx, uid: i32) -> i32 {
-    debug!("emscripten::getpwuid");
+    debug!("emscripten::getpwuid {}", uid);
-    0
+
+    #[repr(C)]
+    struct GuestPasswd {
+        pw_name: u32,
+        pw_passwd: u32,
+        pw_uid: u32,
+        pw_gid: u32,
+        pw_gecos: u32,
+        pw_dir: u32,
+        pw_shell: u32,
+    }
+
+    unsafe {
+        let passwd = &*_getpwuid(uid as _);
+        let passwd_struct_offset = call_malloc(ctx, mem::size_of::<GuestPasswd>() as _);
+
+        let passwd_struct_ptr =
+            emscripten_memory_pointer!(ctx.memory(0), passwd_struct_offset) as *mut GuestPasswd;
+        (*passwd_struct_ptr).pw_name = copy_cstr_into_wasm(ctx, passwd.pw_name);
+        (*passwd_struct_ptr).pw_passwd = copy_cstr_into_wasm(ctx, passwd.pw_passwd);
+        (*passwd_struct_ptr).pw_gecos = copy_cstr_into_wasm(ctx, passwd.pw_gecos);
+        (*passwd_struct_ptr).pw_dir = copy_cstr_into_wasm(ctx, passwd.pw_dir);
+        (*passwd_struct_ptr).pw_shell = copy_cstr_into_wasm(ctx, passwd.pw_shell);
+        (*passwd_struct_ptr).pw_uid = passwd.pw_uid;
+        (*passwd_struct_ptr).pw_gid = passwd.pw_gid;
+
+        passwd_struct_offset as _
+    }
+    // unsafe { _getpwuid(uid as _) as _}
+    // 0
 }

lib/emscripten/src/syscalls/mod.rs

@@ -39,6 +39,7 @@ use libc::{
     // writev,
     stat,
     write,
+    getuid,
     // readlink,
 };
 use wasmer_runtime_core::{
@@ -611,9 +612,12 @@ pub fn ___syscall197(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_in
     0
 }
 
+// getuid
 pub fn ___syscall199(_ctx: &mut Ctx, _one: i32, _two: i32) -> i32 {
-    debug!("emscripten::___syscall199 - stub");
+    debug!("emscripten::___syscall199 (getuid)");
-    -1
+    let uid = unsafe { getuid() as _ };
+    debug!("  => {}", uid);
+    uid
 }
 
 pub fn ___syscall209(_ctx: &mut Ctx, _one: i32, _two: i32) -> i32 {