<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/122387>122387</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [lldb] python API SBDebugger.GetOutputFileHandle() returns a file handle with the wrong mode for stdout/stderr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ashgti
      </td>
    </tr>
</table>

<pre>
    It looks like when lldb initializes the default OutputFileHandle and ErrorFileHandle on a new debugger instance it is not setting the handles as writable (mode='w').

Here is a simple python script using the lldb module to illustrate this:

```python
import lldb

dbg = lldb.SBDebugger.Create()

print("output", dbg.GetOutputFileHandle()) #> output <_io.TextIOWrapper name=1 mode='r' encoding='UTF-8'>
print("error", dbg.GetErrorFileHandle()) #> error <_io.TextIOWrapper name=2 mode='r' encoding='UTF-8'>
```

I think this is happening because:

- Debugger initializes with a `FILE*` https://github.com/llvm/llvm-project/blob/ba704d59569151f1b8b6552ed22a7b840f5e6256/lldb/source/Core/Debugger.cpp#L878
- Calling into this `StreamFile` constructor https://github.com/llvm/llvm-project/blob/ba704d59569151f1b8b6552ed22a7b840f5e6256/lldb/include/lldb/Host/StreamFile.h#L31C3-L31C13
- That calls into `NativeFile` https://github.com/llvm/llvm-project/blob/ba704d59569151f1b8b6552ed22a7b840f5e6256/lldb/source/Host/common/StreamFile.cpp#L30
- That sets the options to `options()` https://github.com/llvm/llvm-project/blob/ba704d59569151f1b8b6552ed22a7b840f5e6256/lldb/include/lldb/Host/File.h#L384
- That is initialized to `'r'` mode by default https://github.com/llvm/llvm-project/blob/ba704d59569151f1b8b6552ed22a7b840f5e6256/lldb/include/lldb/Host/File.h#L51

However, stdout and stderr should be set to `mode='w'` by default.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzMVc1u4zYQfhr6MohAUZYsHXTI2nE3wKJbYLfosSDFscSGJgVyFDd9-oKSEicptsBetgUME6Y1o-9nfmSMpneILSs_sPKwkRMNPrQyDj2ZjfL6qb0nsN4_RLDmAeEyoANrtQLjDBlpzV8YgQYEjSc5WYLPE40THY3Fj9JpiyCdhrsQfHh15x1IcHgBjWrqewxgXCTpOgRDYCI4TxCRyLh-zj7McRFkhEswJJVFYKI-e42sODCxuzCxY6LJGL9l_PYjBkxpJERzHi3C-ESDdxC7YEaCKT7nnamcvZ4sAnkw1k6RgiQEGkxkxe2Sj1V8-Sx5GL8159EHmuOXR7TqgRWH-Sb78uGwEsv2ASUhEzUTzfLkGIyj-UL4WSwmBBN70KrPfkJ6L-AaKhpgomDFHSxBwIr978ZnX_FPuv_8W5DjiAGcPCdBcrgqE5jYAbrOa-P65erXr8ebOglW3L3Fg8mnt3DeWfcPNHPIv4IR3wPmRelFq_vkg3uY3UiGDimzS-4p7OQU8cWiGzhca-lamhdDA0hgFT_ef7pjIr0ABqJxNlccmTj2hoZJZZ0_M3G09vH5uBmD_wM7YuKorFfpkDu-1WVTVk1e5qdc1aoqS4FaCLlT9ZafSqxEWc0JdIqIfgodMnHc-5COl7LoxpGJ4lO9q2fse2ltYmUc-YUsq_gXCijPSfsEuvMuUpg68uEHEjCus5PG68VHH1PCK7ZsSESKfF_cpO-8mAl9HSRBJ62NCydW8Z8lmUd8pvMfeLBC7_z57N1bDqsdBb-Cj0jLZPMjGe8iLCzWX2sf_FAi3_LilQv19kogdcxLJ-gV_tqDCXjqSlBPL5P7_0SkzNdB7i_4iCHNo0jaTzSvk0gaQ4A4-MlqUJi8Wvm92wgVf8Uw2-i20E3RyA22-a6ottW2bvhmaCvV1FxhpZWuu65Wojw1J14J5Lw71bncmFZwUfKcN6IQecGzuikbXRW4xS02WlVsy_Esjc2SRpkP_cbEOGGbC1HUu42VCm2c16wQafHN_6ZJWx42oZ2FVVMf2ZZbEyle05AhO-_nWary8LzKbn-5h1dr5puLAwLSFFzahSdjnzfpMhdTdV-Cd_1SCycfVpVT18wab6Zg2-8ujJlcZOK4sn9sxd8BAAD__xruqFA">