mv std libs to library/

1 files changed, 0 insertions, 101 deletions

diff --git a/src/libstd/sys/unix/weak.rs b/src/libstd/sys/unix/weak.rs
deleted file mode 100644
index f4b33a00f7c..00000000000
--- a/src/libstd/sys/unix/weak.rs
+++ /dev/null
@@ -1,101 +0,0 @@
-//! Support for "weak linkage" to symbols on Unix
-//!
-//! Some I/O operations we do in libstd require newer versions of OSes but we
-//! need to maintain binary compatibility with older releases for now. In order
-//! to use the new functionality when available we use this module for
-//! detection.
-//!
-//! One option to use here is weak linkage, but that is unfortunately only
-//! really workable on Linux. Hence, use dlsym to get the symbol value at
-//! runtime. This is also done for compatibility with older versions of glibc,
-//! and to avoid creating dependencies on GLIBC_PRIVATE symbols. It assumes that
-//! we've been dynamically linked to the library the symbol comes from, but that
-//! is currently always the case for things like libpthread/libc.
-//!
-//! A long time ago this used weak linkage for the __pthread_get_minstack
-//! symbol, but that caused Debian to detect an unnecessarily strict versioned
-//! dependency on libc6 (#23628).
-
-// There are a variety of `#[cfg]`s controlling which targets are involved in
-// each instance of `weak!` and `syscall!`. Rather than trying to unify all of
-// that, we'll just allow that some unix targets don't use this module at all.
-#![allow(dead_code, unused_macros)]
-
-use crate::ffi::CStr;
-use crate::marker;
-use crate::mem;
-use crate::sync::atomic::{AtomicUsize, Ordering};
-
-macro_rules! weak {
-    (fn $name:ident($($t:ty),*) -> $ret:ty) => (
-        static $name: crate::sys::weak::Weak<unsafe extern fn($($t),*) -> $ret> =
-            crate::sys::weak::Weak::new(concat!(stringify!($name), '\0'));
-    )
-}
-
-pub struct Weak<F> {
-    name: &'static str,
-    addr: AtomicUsize,
-    _marker: marker::PhantomData<F>,
-}
-
-impl<F> Weak<F> {
-    pub const fn new(name: &'static str) -> Weak<F> {
-        Weak { name, addr: AtomicUsize::new(1), _marker: marker::PhantomData }
-    }
-
-    pub fn get(&self) -> Option<F> {
-        assert_eq!(mem::size_of::<F>(), mem::size_of::<usize>());
-        unsafe {
-            if self.addr.load(Ordering::SeqCst) == 1 {
-                self.addr.store(fetch(self.name), Ordering::SeqCst);
-            }
-            match self.addr.load(Ordering::SeqCst) {
-                0 => None,
-                addr => Some(mem::transmute_copy::<usize, F>(&addr)),
-            }
-        }
-    }
-}
-
-unsafe fn fetch(name: &str) -> usize {
-    let name = match CStr::from_bytes_with_nul(name.as_bytes()) {
-        Ok(cstr) => cstr,
-        Err(..) => return 0,
-    };
-    libc::dlsym(libc::RTLD_DEFAULT, name.as_ptr()) as usize
-}
-
-#[cfg(not(target_os = "linux"))]
-macro_rules! syscall {
-    (fn $name:ident($($arg_name:ident: $t:ty),*) -> $ret:ty) => (
-        unsafe fn $name($($arg_name: $t),*) -> $ret {
-            use super::os;
-
-            weak! { fn $name($($t),*) -> $ret }
-
-            if let Some(fun) = $name.get() {
-                fun($($arg_name),*)
-            } else {
-                os::set_errno(libc::ENOSYS);
-                -1
-            }
-        }
-    )
-}
-
-#[cfg(target_os = "linux")]
-macro_rules! syscall {
-    (fn $name:ident($($arg_name:ident: $t:ty),*) -> $ret:ty) => (
-        unsafe fn $name($($arg_name:$t),*) -> $ret {
-            // This looks like a hack, but concat_idents only accepts idents
-            // (not paths).
-            use libc::*;
-
-            syscall(
-                concat_idents!(SYS_, $name),
-                $($arg_name as c_long),*
-            ) as $ret
-        }
-    )
-}