dlsym.rs.html -- source

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cookie

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crc32fast

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sync

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crossbeam_utils

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sync

mod.rs parker.rs sharded_lock.rs wait_group.rs

backoff.rs cache_padded.rs lib.rs thread.rs

curl

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error_chain

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failure

backtrace

internal.rs mod.rs

error

error_impl.rs mod.rs

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failure_derive

flate2

deflate

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ffi

gz

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zlib

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fnv

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stream

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mod.rs queue.rs

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h2

http

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client

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proto

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server

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hyper_tls

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idna

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iovec

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libc

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align.rs mod.rs

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libz_sys

lock_api

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log

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matches

maybe_uninit

memoffset

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mime

lib.rs parse.rs

mime_guess

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miniz_oxide

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parking_lot_core

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percent_encoding

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protobuf

protobuf_json

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quote

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rand

rand_chacha

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rand_os

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rand_xorshift

regex

literal

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regex_syntax

ast

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hir

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unicode_tables

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reqwest

rustc_demangle

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rustc_serialize

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ryu

buffer

pretty

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common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs lib.rs

scopeguard

serde

de

from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

private

de.rs macros.rs mod.rs ser.rs

ser

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export.rs integer128.rs lib.rs macros.rs

serde_codegen_internals

ast.rs attr.rs case.rs ctxt.rs lib.rs

serde_derive

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

serde_json

value

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de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_urlencoded

ser

key.rs mod.rs pair.rs part.rs value.rs

slab

smallvec

smpl_jwt

error.rs lib.rs

socket2

sys

lib.rs sockaddr.rs socket.rs utils.rs

string

syn

synom

helper.rs lib.rs space.rs

synstructure

lib.rs macros.rs

time

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tokio

executor

current_thread

reactor

mod.rs poll_evented.rs

runtime

current_thread

builder.rs mod.rs runtime.rs

threadpool

builder.rs mod.rs shutdown.rs task_executor.rs

util

enumerate.rs future.rs mod.rs stream.rs

clock.rs io.rs lib.rs net.rs prelude.rs timer.rs

tokio_buf

util

chain.rs collect.rs from.rs iter.rs limit.rs mod.rs stream.rs

lib.rs never.rs size_hint.rs str.rs u8.rs

tokio_current_thread

lib.rs scheduler.rs

tokio_executor

enter.rs error.rs executor.rs global.rs lib.rs park.rs typed.rs

tokio_io

tokio_reactor

background.rs lib.rs poll_evented.rs registration.rs sharded_rwlock.rs

tokio_sync

mpsc

block.rs bounded.rs chan.rs list.rs mod.rs unbounded.rs

task

atomic_task.rs mod.rs

lib.rs lock.rs loom.rs oneshot.rs semaphore.rs watch.rs

tokio_tcp

incoming.rs lib.rs listener.rs stream.rs

tokio_threadpool

tokio_timer

try_from

char.rs int.rs lib.rs

try_lock

unicase

unicode

ascii.rs lib.rs

unicode_bidi

char_data

mod.rs tables.rs

deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

form_urlencoded.rs host.rs lib.rs origin.rs parser.rs path_segments.rs query_encoding.rs quirks.rs slicing.rs

uuid

adapter

core_support

parser

core_support.rs mod.rs std_support.rs

builder.rs core_support.rs lib.rs prelude.rs std_support.rs v4.rs

want

use std::marker;
use std::mem;
use std::sync::atomic::{AtomicUsize, Ordering};

use libc;

macro_rules! dlsym {
    (fn $name:ident($($t:ty),*) -> $ret:ty) => (
        #[allow(bad_style)]
        static $name: ::sys::unix::dlsym::DlSym<unsafe extern fn($($t),*) -> $ret> =
            ::sys::unix::dlsym::DlSym {
                name: concat!(stringify!($name), "\0"),
                addr: ::std::sync::atomic::ATOMIC_USIZE_INIT,
                _marker: ::std::marker::PhantomData,
            };
    )
}

pub struct DlSym<F> {
    pub name: &'static str,
    pub addr: AtomicUsize,
    pub _marker: marker::PhantomData<F>,
}

impl<F> DlSym<F> {
    pub fn get(&self) -> Option<&F> {
        assert_eq!(mem::size_of::<F>(), mem::size_of::<usize>());
        unsafe {
            if self.addr.load(Ordering::SeqCst) == 0 {
                self.addr.store(fetch(self.name), Ordering::SeqCst);
            }
            if self.addr.load(Ordering::SeqCst) == 1 {
                None
            } else {
                mem::transmute::<&AtomicUsize, Option<&F>>(&self.addr)
            }
        }
    }
}

unsafe fn fetch(name: &str) -> usize {
    assert_eq!(name.as_bytes()[name.len() - 1], 0);
    match libc::dlsym(libc::RTLD_DEFAULT, name.as_ptr() as *const _) as usize {
        0 => 1,
        n => n,
    }
}