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impl fd_seek

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This commit is contained in:
Mark McCaskey 2019-04-02 16:16:06 -07:00
parent 37371eba6e
commit 7d07b6f0b4
1 changed files with 23 additions and 9 deletions
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32
lib/wasi/src/syscalls/mod.rs
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@ -210,8 +210,11 @@ pub fn fd_advise(
len: __wasi_filesize_t,
advice: __wasi_advice_t,
) -> __wasi_errno_t {
debug!("wasi::fd_advise");
unimplemented!()
debug!("wasi::fd_advise: fd={}", fd);
// this is used for our own benefit, so just returning success is a valid
// implementation for now
__WASI_ESUCCESS
}
/// ### `fd_allocate`
@ -677,15 +680,26 @@ pub fn fd_seek(
whence: __wasi_whence_t,
newoffset: WasmPtr<__wasi_filesize_t>,
) -> __wasi_errno_t {
debug!("wasi::fd_seek");
debug!("wasi::fd_seek: fd={}", fd);
let memory = ctx.memory(0);
// TODO: check __WASI_RIGHT_FD_SEEK
// TODO: handle directory input
if let Ok(new_offset_cell) = newoffset.deref(memory) {
unimplemented!()
} else {
__WASI_EFAULT
let state = get_wasi_state(ctx);
let new_offset_cell = wasi_try!(newoffset.deref(memory));
let fd_entry = wasi_try!(state.fs.fd_map.get_mut(&fd).ok_or(__WASI_EBADF));
if !has_rights(fd_entry.rights, __WASI_RIGHT_FD_SEEK) {
return __WASI_EACCES;
}
// TODO: handle case if fd is a dir?
match whence {
__WASI_WHENCE_CUR => fd_entry.offset = (fd_entry.offset as i64 + offset) as u64,
__WASI_WHENCE_END => unimplemented!(),
__WASI_WHENCE_SET => fd_entry.offset = offset as u64,
_ => return __WASI_EINVAL,
}
__WASI_ESUCCESS
}
/// ### `fd_sync()`