<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/123492>123492</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-tidy android-cloexec-fopen docs should say if `e` is safe across platforms
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang-tidy
      </td>
    </tr>

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

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

<pre>
    The docs for `android-cloexec-fopen` here:

https://clang.llvm.org/extra/clang-tidy/checks/android/cloexec-fopen.html

say only "fopen() should include `e` in their mode string; so `re` would be valid. This is equivalent to having set FD_CLOEXEC on that descriptor."

By having "android" in the check's name, one assumes this works on Android.

The macOS 10.13 through 15.3 man pages say `e` is supported.

Not sure about Windows, linux, the BSDs, or others.

But most important of all: is it known that adding `e` would be harmless/ignored on all OSes?  If it's not knowm, it's risky to just add an `e` in cross-platform code, because maybe the `e` would break some implementations of fopen.
</pre>
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