segfault fault filestream:close()

[bokunodev]

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• [ ] I tested it on latest Nelua version from master branch.
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• [ ] My code has no errors or misuse of Nelua.

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Bug description

i made a program to download something from internet example.com and write it to a file. but its always Segmentation fault (core dumped) when i call filestream:close()

Code example

Provide minimal reproduction code to test the bug. Please, format the code properly and try to keep it as simple as possible, just focusing on the experienced bug.

require "modules/curl/curl"
require "io"

print("open a file")
local s:string, i:integer
local file:filestream
file,s,i = io.open("example", "w+")
print(file,s,i)

local function write_func(ptr:cstring, size:csize, nmemb:csize, userdata:pointer):csize
    local b:boolean, s:string, i:integer
    b, s, i = file:write(ptr)
    print("write callback", b, s, i)
    return size*nmemb
end

local client:pointer = curl_easy_init()
curl_easy_setopt(client, CURLOPT_URL, "https://example.com")
curl_easy_setopt(client, CURLOPT_WRITEFUNCTION, write_func)
local response:CURLcode = curl_easy_perform(client)
print(file:flush())
print("closing tmpfile", file:close()) -- always segfault after printing text.
print("curl cleanup")
curl_easy_cleanup(client)

Expected behavior

no error

Environment

Provide relevant information about your environment:

• Nelua version (you can check with nelua -v).

  ~ $ nelua --version
  Nelua 0.2.0-dev
  Build number: 1020
  Git date: 2021-05-12 17:25:40 -0300
  Git hash: e9de5bbeabd77e1c1b8099c3ab53eaabec1a1774

• Platform (e.g. Windows/MSYS2, Ubuntu Linux, MacOS) Arch linux

• C compiler if your bug has C compiler errors. (e.g. GCC 10.2, Clang 11)

  ~ $ gcc --version
  gcc (GCC) 10.2.0

[bokunodev]

its weird, i cant replicate it anymore.

[edubart]

Actually it's an error over a mistake. You made a mistake by trying to close the same file twice, but I tested the code here, and it crashed with the wrong error, I will fix soon, so when this is mistake happens the user can recover from it.