dlsym.rs.html -- source

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arrayvec

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symbolize

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getrandom

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open

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parking_lot_core

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ser

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slab

smallvec

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stream_cancel

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textwrap

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thread_local

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tokio

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executor

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runtime

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threadpool

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

tokio_codec

bytes_codec.rs lib.rs lines_codec.rs

tokio_core

tokio_current_thread

lib.rs scheduler.rs

tokio_executor

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

tokio_fs

tokio_io

tokio_reactor

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

tokio_rustls

common

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client.rs lib.rs server.rs

tokio_sync

mpsc

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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

tokio_udp

frame.rs lib.rs recv_dgram.rs send_dgram.rs socket.rs

tokio_uds

datagram.rs frame.rs incoming.rs lib.rs listener.rs recv_dgram.rs send_dgram.rs stream.rs ucred.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

untrusted

vec_map

void

webpki

calendar.rs cert.rs der.rs error.rs name.rs signed_data.rs time.rs trust_anchor_util.rs verify_cert.rs webpki.rs

windows_service

x11

dpms.rs glx.rs internal.rs keysym.rs lib.rs link.rs xcursor.rs xf86vmode.rs xfixes.rs xft.rs xinerama.rs xinput.rs xinput2.rs xlib.rs xlib_xcb.rs xmd.rs xmu.rs xrandr.rs xrecord.rs xrender.rs xss.rs xt.rs xtest.rs

xcb

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base.rs big_requests.rs xc_misc.rs xkb.rs xproto.rs

base.rs big_requests.rs lib.rs xc_misc.rs xkb.rs xproto.rs

xkbcommon

xkb

x11

compose.rs ffi.rs keysyms.rs mod.rs

yasna

deserializer

models

der.rs mod.rs oid.rs time.rs

reader

error.rs mod.rs

serializer

tags

writer

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,
    }
}