wasmer/src/apis/emscripten/env.rs

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use super::super::host;
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/// NOTE: These syscalls only support wasm_32 for now because they take u32 offset
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use libc::{c_int, getgrnam as libc_getgrnam, getpwnam as libc_getpwnam};
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use std::ffi::CStr;
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use std::mem;
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use std::os::raw::c_char;
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use super::utils::{copy_cstr_into_wasm, copy_terminated_array_of_cstrs};
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use crate::webassembly::Instance;
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/// emscripten: _getenv
pub extern "C" fn _getenv(name_ptr: c_int, instance: &mut Instance) -> c_int {
debug!("emscripten::_getenv {}", name_ptr);
let name = unsafe {
let memory_name_ptr = instance.memory_offset_addr(0, name_ptr as usize) as *const c_char;
CStr::from_ptr(memory_name_ptr).to_str().unwrap()
};
match host::get_env(name, instance) {
Ok(_) => {
unimplemented!();
}
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Err(_) => 0,
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}
}
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pub extern "C" fn _getpwnam(name_ptr: c_int, instance: &mut Instance) -> c_int {
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debug!("emscripten::_getpwnam {}", name_ptr);
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#[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,
}
let name = unsafe {
let memory_name_ptr = instance.memory_offset_addr(0, name_ptr as usize) as *const c_char;
CStr::from_ptr(memory_name_ptr)
};
unsafe {
let passwd = &*libc_getpwnam(name.as_ptr());
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let passwd_struct_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(
mem::size_of::<GuestPasswd>() as _,
instance,
);
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let passwd_struct_ptr =
instance.memory_offset_addr(0, passwd_struct_offset as _) as *mut GuestPasswd;
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(*passwd_struct_ptr).pw_name = copy_cstr_into_wasm(instance, passwd.pw_name);
(*passwd_struct_ptr).pw_passwd = copy_cstr_into_wasm(instance, passwd.pw_passwd);
(*passwd_struct_ptr).pw_gecos = copy_cstr_into_wasm(instance, passwd.pw_gecos);
(*passwd_struct_ptr).pw_dir = copy_cstr_into_wasm(instance, passwd.pw_dir);
(*passwd_struct_ptr).pw_shell = copy_cstr_into_wasm(instance, passwd.pw_shell);
(*passwd_struct_ptr).pw_uid = passwd.pw_uid;
(*passwd_struct_ptr).pw_gid = passwd.pw_gid;
passwd_struct_offset as c_int
}
}
pub extern "C" fn _getgrnam(name_ptr: c_int, instance: &mut Instance) -> c_int {
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debug!("emscripten::_getgrnam {}", name_ptr);
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#[repr(C)]
struct GuestGroup {
gr_name: u32,
gr_passwd: u32,
gr_gid: u32,
gr_mem: u32,
}
let name = unsafe {
let memory_name_ptr = instance.memory_offset_addr(0, name_ptr as usize) as *const c_char;
CStr::from_ptr(memory_name_ptr)
};
unsafe {
let group = &*libc_getgrnam(name.as_ptr());
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let group_struct_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(
mem::size_of::<GuestGroup>() as _,
instance,
);
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let group_struct_ptr =
instance.memory_offset_addr(0, group_struct_offset as _) as *mut GuestGroup;
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(*group_struct_ptr).gr_name = copy_cstr_into_wasm(instance, group.gr_name);
(*group_struct_ptr).gr_passwd = copy_cstr_into_wasm(instance, group.gr_passwd);
(*group_struct_ptr).gr_gid = group.gr_gid;
(*group_struct_ptr).gr_mem = copy_terminated_array_of_cstrs(instance, group.gr_mem);
group_struct_offset as c_int
}
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}
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pub extern "C" fn _localtime_r() -> u32 {
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debug!("emscripten::_localtime_r");
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0
}
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pub extern "C" fn _getpagesize() -> u32 {
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debug!("emscripten::_getpagesize");
16384
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}
pub extern "C" fn ___build_environment(environ: c_int) {
debug!("emscripten::___build_environment {}", environ);
}