Rollup merge of #135696 - joboet:move_pal_io, r=Noratrieb

std: move `io` module out of `pal`, get rid of `sys_common::io`

Part of #117276.

This does two related things:
1. It moves the platform-specific definitions for `IoSlice`, `IoSliceMut` and `is_terminal` out of `pal` and into `sys` and unifies some of them.
2. It gets rid of `sys_common::io`, moving the non-platform-specific test helpers into `std::test_helpers` and the buffer size definition to the new `sys::io` module.

1 files changed, 0 insertions, 87 deletions

diff --git a/library/std/src/sys/pal/unix/io.rs b/library/std/src/sys/pal/unix/io.rs
deleted file mode 100644
index 0d5a152dc0d..00000000000
--- a/library/std/src/sys/pal/unix/io.rs
+++ /dev/null
@@ -1,87 +0,0 @@
-use libc::{c_void, iovec};
-
-use crate::marker::PhantomData;
-use crate::os::fd::{AsFd, AsRawFd};
-use crate::slice;
-
-#[derive(Copy, Clone)]
-#[repr(transparent)]
-pub struct IoSlice<'a> {
-    vec: iovec,
-    _p: PhantomData<&'a [u8]>,
-}
-
-impl<'a> IoSlice<'a> {
-    #[inline]
-    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
-        IoSlice {
-            vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() },
-            _p: PhantomData,
-        }
-    }
-
-    #[inline]
-    pub fn advance(&mut self, n: usize) {
-        if self.vec.iov_len < n {
-            panic!("advancing IoSlice beyond its length");
-        }
-
-        unsafe {
-            self.vec.iov_len -= n;
-            self.vec.iov_base = self.vec.iov_base.add(n);
-        }
-    }
-
-    #[inline]
-    pub const fn as_slice(&self) -> &'a [u8] {
-        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
-    }
-}
-
-#[repr(transparent)]
-pub struct IoSliceMut<'a> {
-    vec: iovec,
-    _p: PhantomData<&'a mut [u8]>,
-}
-
-impl<'a> IoSliceMut<'a> {
-    #[inline]
-    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
-        IoSliceMut {
-            vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() },
-            _p: PhantomData,
-        }
-    }
-
-    #[inline]
-    pub fn advance(&mut self, n: usize) {
-        if self.vec.iov_len < n {
-            panic!("advancing IoSliceMut beyond its length");
-        }
-
-        unsafe {
-            self.vec.iov_len -= n;
-            self.vec.iov_base = self.vec.iov_base.add(n);
-        }
-    }
-
-    #[inline]
-    pub fn as_slice(&self) -> &[u8] {
-        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
-    }
-
-    #[inline]
-    pub const fn into_slice(self) -> &'a mut [u8] {
-        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
-    }
-
-    #[inline]
-    pub fn as_mut_slice(&mut self) -> &mut [u8] {
-        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
-    }
-}
-
-pub fn is_terminal(fd: &impl AsFd) -> bool {
-    let fd = fd.as_fd();
-    unsafe { libc::isatty(fd.as_raw_fd()) != 0 }
-}