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writev

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This commit is contained in:
Mackenzie Clark 2019-03-22 11:19:06 -07:00
parent 0c004c9290
commit eedb6b9d72
1 changed files with 39 additions and 45 deletions
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84
lib/emscripten/src/syscalls/unix/vfs.rs
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@ -9,6 +9,7 @@ use std::os::raw::c_int;
use std::slice;
use wasmer_runtime_core::vm::Ctx;
use bit_field::BitArray;
use crate::macros::emscripten_memory_ptr;
/// read
pub fn ___syscall3(ctx: &mut Ctx, _: i32, mut varargs: VarArgs) -> i32 {
@ -633,11 +634,10 @@ pub fn ___syscall102(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_in
/// writev
#[allow(clippy::cast_ptr_alignment)]
pub fn ___syscall146(ctx: &mut Ctx, _which: i32, mut varargs: VarArgs) -> i32 {
// unimplemented!();
// -> ssize_t
debug!("emscripten::___syscall146 (writev) {}", _which);
let fd: i32 = varargs.get(ctx);
let iov: i32 = varargs.get(ctx);
let iov_array_offset: i32 = varargs.get(ctx);
let iovcnt: i32 = varargs.get(ctx);
#[repr(C)]
@ -646,55 +646,49 @@ pub fn ___syscall146(ctx: &mut Ctx, _which: i32, mut varargs: VarArgs) -> i32 {
iov_len: i32,
}
debug!("=> fd: {}, iov: {}, iovcnt = {}", fd, iov, iovcnt);
let mut ret = 0;
unsafe {
for i in 0..iovcnt {
let guest_iov_addr =
emscripten_memory_pointer!(ctx.memory(0), (iov + i * 8)) as *mut GuestIovec;
let iov_base = emscripten_memory_pointer!(ctx.memory(0), (*guest_iov_addr).iov_base)
as *const c_void;
let iov_len = (*guest_iov_addr).iov_len as _;
// debug!("=> iov_addr: {:?}, {:?}", iov_base, iov_len);
// let curr = libc::write(fd, iov_base, iov_len);
let iov_array_offset = iov_array_offset as u32;
let count = (0..iovcnt as u32).fold(0,|acc, iov_array_index| {
unsafe {
let iov_offset = iov_array_offset + iov_array_index * 8; // get the offset to the iov
let curr = {
debug!("emscripten::___syscall4 (write - vfs) {}", _which);
let fd: i32 = fd; // varargs.get(ctx);
// let buf = iov_base; // varargs.get(ctx);
let count: i32 = iov_len; // varargs.get(ctx);
let buf_slice = unsafe { slice::from_raw_parts_mut(iov_base as *mut _, count as _) };
let vfd = VirtualFd(fd);
let vfs = crate::env::get_emscripten_data(ctx).vfs.as_mut().unwrap();
let count: usize = match vfs.fd_map.get(&vfd) {
Some(FileHandle::VirtualFile(handle)) => {
vfs.vfs
.write_file(*handle as _, buf_slice, count as _, 0)
.unwrap();
count as usize
}
Some(FileHandle::Socket(host_fd)) => unsafe {
libc::write(*host_fd, iov_base as _, count as _) as usize
},
None => panic!(),
};
// debug!("wrote: {}", read_string_from_wasm(ctx.memory(0), buf));
debug!(
"=> fd: {} (host {}), buf: {:?}, count: {}\n",
vfd.0, fd, iov_base, count
);
count as c_int
let (iov_buf_slice, iov_buf_ptr, count) = {
let emscripten_memory = ctx.memory(0);
let guest_iov_ptr = emscripten_memory_ptr(emscripten_memory, iov_offset) as *mut GuestIovec;
let iov_base_offset = (*guest_iov_ptr).iov_base as u32;
let iov_buf_ptr = emscripten_memory_ptr(emscripten_memory, iov_base_offset) as *const c_void;
let iov_len = (*guest_iov_ptr).iov_len as usize;
let iov_buf_slice = unsafe { slice::from_raw_parts(iov_buf_ptr as *const u8, iov_len) };
(iov_buf_slice, iov_buf_ptr, iov_len)
};
if curr < 0 {
return -1;
}
ret += curr;
let vfd = VirtualFd(fd);
let vfs = crate::env::get_emscripten_data(ctx).vfs.as_mut().unwrap();
let count: usize = match vfs.fd_map.get(&vfd) {
Some(FileHandle::VirtualFile(handle)) => {
vfs.vfs
.write_file(*handle as _, iov_buf_slice, count, 0)
.unwrap();
count as usize
}
Some(FileHandle::Socket(host_fd)) => unsafe {
let count = libc::write(*host_fd, iov_buf_ptr, count);
if count < 0 {
panic!()
}
count as usize
},
None => panic!(),
};
acc + count
}
ret as _
}
});
debug!("=> fd: {}, iov: {}, iovcnt = {}, returning {}", fd, iov_array_offset, iovcnt, count);
count as _
}
/// pread
pub fn ___syscall180(ctx: &mut Ctx, _which: c_int, mut varargs: VarArgs) -> c_int {
debug!("emscripten::___syscall180 (pread) {}", _which);