wasmer/src/apis/emscripten/env.rs

135 lines
4.6 KiB
Rust
Raw Normal View History

2018-11-22 04:59:23 +00:00
use super::super::host;
2018-11-21 23:10:03 +00:00
/// NOTE: These syscalls only support wasm_32 for now because they take u32 offset
2018-12-18 17:43:59 +00:00
use libc::{c_int, c_long, getenv, getgrnam as libc_getgrnam, getpwnam as libc_getpwnam, sysconf};
2018-11-21 23:10:03 +00:00
use std::ffi::CStr;
2018-11-27 04:28:13 +00:00
use std::mem;
2018-11-27 04:29:26 +00:00
use std::os::raw::c_char;
2018-11-21 23:10:03 +00:00
2018-12-12 06:10:35 +00:00
use super::utils::{copy_cstr_into_wasm, copy_terminated_array_of_cstrs, allocate_on_stack};
2018-11-27 04:29:26 +00:00
use crate::webassembly::Instance;
2018-11-21 23:10:03 +00:00
2018-12-18 12:44:15 +00:00
// #[no_mangle]
2018-12-13 23:09:07 +00:00
/// emscripten: _getenv // (name: *const char) -> *const c_char;
2018-12-17 08:15:08 +00:00
pub extern "C" fn _getenv(name: c_int, instance: &mut Instance) -> u32 {
2018-12-18 12:44:15 +00:00
debug!("emscripten::_getenv");
let name_addr = instance.memory_offset_addr(0, name as usize) as *const c_char;
debug!("=> name({:?})", unsafe { CStr::from_ptr(name_addr) });
let c_str = unsafe { getenv(name_addr) };
2018-12-18 17:43:59 +00:00
if c_str.is_null() {
return 0;
2018-11-21 23:10:03 +00:00
}
2018-12-18 12:44:15 +00:00
unsafe { copy_cstr_into_wasm(instance, c_str) }
2018-11-21 23:10:03 +00:00
}
2018-11-26 06:17:33 +00:00
pub extern "C" fn _getpwnam(name_ptr: c_int, instance: &mut Instance) -> c_int {
2018-11-26 22:30:28 +00:00
debug!("emscripten::_getpwnam {}", name_ptr);
2018-11-26 06:17:33 +00:00
#[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());
2018-11-28 21:25:56 +00:00
let passwd_struct_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(
mem::size_of::<GuestPasswd>() as _,
instance,
);
2018-11-26 06:17:33 +00:00
2018-11-27 04:29:26 +00:00
let passwd_struct_ptr =
instance.memory_offset_addr(0, passwd_struct_offset as _) as *mut GuestPasswd;
2018-11-26 06:17:33 +00:00
(*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 {
2018-11-26 22:30:28 +00:00
debug!("emscripten::_getgrnam {}", name_ptr);
2018-11-26 06:17:33 +00:00
#[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());
2018-11-28 21:25:56 +00:00
let group_struct_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(
mem::size_of::<GuestGroup>() as _,
instance,
);
2018-11-26 06:17:33 +00:00
2018-11-27 04:29:26 +00:00
let group_struct_ptr =
instance.memory_offset_addr(0, group_struct_offset as _) as *mut GuestGroup;
2018-11-26 06:17:33 +00:00
(*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
}
2018-11-26 21:01:15 +00:00
}
2018-11-26 20:42:47 +00:00
2018-11-27 04:29:26 +00:00
pub extern "C" fn _getpagesize() -> u32 {
2018-11-26 22:30:28 +00:00
debug!("emscripten::_getpagesize");
16384
2018-11-27 04:29:26 +00:00
}
2018-12-12 06:10:35 +00:00
pub extern "C" fn ___build_environment(environ: c_int, instance: &mut Instance) {
debug!("emscripten::___build_environment {}", environ);
2018-12-12 06:10:35 +00:00
const MAX_ENV_VALUES: u32 = 64;
const TOTAL_ENV_SIZE: u32 = 1024;
let mut environment =
instance.memory_offset_addr(0, environ as _) as *mut c_int;
unsafe {
let (pool_offset, pool_slice): (u32, &mut [u8]) = allocate_on_stack(TOTAL_ENV_SIZE as u32, instance);
let (env_offset, env_slice): (u32, &mut [u8]) = allocate_on_stack((MAX_ENV_VALUES*4) as u32, instance);
let mut env_ptr =
instance.memory_offset_addr(0, env_offset as _) as *mut c_int;
let mut pool_ptr =
instance.memory_offset_addr(0, pool_offset as _) as *mut c_int;
*env_ptr = pool_offset as i32;
*environment = env_offset as i32;
// *env_ptr = 0;
};
// unsafe {
// *env_ptr = 0;
// };
}
2018-12-05 23:14:58 +00:00
2018-12-08 06:31:49 +00:00
pub extern "C" fn _sysconf(name: c_int, _instance: &mut Instance) -> c_long {
2018-12-05 23:14:58 +00:00
debug!("emscripten::_sysconf {}", name);
// TODO: Implement like emscripten expects regarding memory/page size
2018-12-15 06:46:11 +00:00
unsafe { sysconf(name) }
2018-12-05 23:14:58 +00:00
}