gistfile1.txt

[wocky@XMPPwocky rustcrap]$ rustc -g -L . -o libplugin.so plugin.rs; rustc main.rs -L . -g -C prefer-dynamic
[wocky@XMPPwocky rustcrap]$ ./main 
Got: 1024
Segmentation fault (core dumped)

gistfile2.txt

Core was generated by `./main'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fee8943a140 in ?? ()
(gdb) bt
#0  0x00007fee8943a140 in ?? ()
#1  0x00007fee8a96f278 in task::spawn_opts::closure.7804 () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libnative-1fb5e2c0-0.11.0-pre.so
#2  0x00007fee8a437543 in rt::task::Task::run::closure.25317 () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-59beb4f7-0.11.0-pre.so
#3  0x00007fee8a49ca1c in rust_try () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-59beb4f7-0.11.0-pre.so
#4  0x00007fee8a4374af in rt::task::Task::run::hbc4d0611fe89bbd5rkw::v0.11.0.pre () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-59beb4f7-0.11.0-pre.so
#5  0x00007fee8a96f0e0 in task::spawn_opts::closure.7777 () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libnative-1fb5e2c0-0.11.0-pre.so
#6  0x00007fee8a43b574 in rt::thread::thread_start::h6df36152f3dd6decZ3w::v0.11.0.pre () from /home/wocky/rustcrap/../../../usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-59beb4f7-0.11.0-pre.so
#7  0x00007fee89968124 in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007fee89c684bd in clone () from /usr/lib/libc.so.6

(gdb)  info reg
rax            0x7fee8943a140   140662481854784
rbx            0x0      0
rcx            0x1      1
rdx            0x7fee88bfede8   140662473223656
rsi            0x7fee88bfede8   140662473223656
rdi            0x0      0
rbp            0x0      0x0
rsp            0x7fee88bfed38   0x7fee88bfed38
r8             0x7fee88bff700   140662473225984
r9             0x7fee88bff700   140662473225984
r10            0x7fee88bfecb0   140662473223344
r11            0x7fee89bb2bc0   140662489689024
r12            0x7fee88c1b040   140662473338944
r13            0x7fee88bff700   140662473225984
r14            0x7fffc7f050c0   140736547803328
r15            0x7fffc7f050c0   140736547803328
rip            0x7fee8943a140   0x7fee8943a140
eflags         0x10246  [ PF ZF IF RF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0

(gdb) frame 1
(gdb) disassemble

Dump of assembler code for function _ZN4task10spawn_opts12closure.7804E:
   0x00007fee8a96f230 <+0>:     cmp    %fs:0x70,%rsp
   0x00007fee8a96f239 <+9>:     ja     0x7fee8a96f255 <_ZN4task10spawn_opts12closure.7804E+37>
   0x00007fee8a96f23b <+11>:    movabs $0x68,%r10
   0x00007fee8a96f245 <+21>:    movabs $0x0,%r11
   0x00007fee8a96f24f <+31>:    callq  0x7fee8a96fac8 <__morestack>
   0x00007fee8a96f254 <+36>:    retq   
   0x00007fee8a96f255 <+37>:    push   %r14
   0x00007fee8a96f257 <+39>:    push   %rbx
   0x00007fee8a96f258 <+40>:    sub    $0x58,%rsp
   0x00007fee8a96f25c <+44>:    mov    0x20(%rdi),%rax
   0x00007fee8a96f260 <+48>:    mov    0x10(%rax),%rbx
   0x00007fee8a96f264 <+52>:    movzbl (%rax),%ecx
   0x00007fee8a96f267 <+55>:    movb   $0x0,(%rax)
   0x00007fee8a96f26a <+58>:    cmp    $0x1,%ecx
   0x00007fee8a96f26d <+61>:    jne    0x7fee8a96f2a0 <_ZN4task10spawn_opts12closure.7804E+112>
   0x00007fee8a96f26f <+63>:    mov    0x8(%rax),%rax
   0x00007fee8a96f273 <+67>:    mov    %rbx,%rdi
   0x00007fee8a96f276 <+70>:    callq  *%rax
=> 0x00007fee8a96f278 <+72>:    test   %rbx,%rbx
   0x00007fee8a96f27b <+75>:    je     0x7fee8a96f298 <_ZN4task10spawn_opts12closure.7804E+104>
   
[wocky@XMPPwocky rustcrap]$ rustc -v
rustc 0.11.0-pre-nightly (a183829 2014-05-28 01:06:45 -0700)
host: x86_64-unknown-linux-gnu

[wocky@XMPPwocky rustcrap]$ uname -a
Linux XMPPwocky 3.14.1-1-ARCH #1 SMP PREEMPT Mon Apr 14 20:40:47 CEST 2014 x86_64 GNU/Linux

[wocky@XMPPwocky rustcrap]$ # i don't even know

main.rs

use std::unstable::dynamic_lib::DynamicLibrary;

type RegistrarFn = fn() -> Receiver<int>;

fn main() {
    let plugin = DynamicLibrary::open(Some("/home/wocky/rustcrap/libplugin.so")).unwrap();
    let registrar: RegistrarFn = unsafe {
        plugin.symbol("register_plugin")
    }.unwrap();
    let chan = registrar();
    println!("Got: {}", chan.recv());
}

plugin.rs

![crate_type = "dylib"]

#[no_mangle]
pub fn register_plugin() -> Receiver<int> {
        spawn(proc() {
                println!("hi");
        });
        let (tx, rx) = channel();
                tx.send(1024);
                    rx
}