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Ran 20 Nov 2025 02:44AM UTC

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Committed 19 Nov 2025 11:19PM UTC coverage: 72.548% (+0.1%) from 72.449%

Job # 19520565317.1

Build Type

push

github

Committed by

web-flow

Commit Message

core: Verify inherited FDs are writable for stdout/stderr (#39674)

When inheriting file descriptors for stdout/stderr (either from stdin or
when making stderr inherit from stdout), we previously just assumed they
would be writable and dup'd them. This could lead to broken setups if
the inherited FD was actually opened read-only.

Before dup'ing any inherited FDs to stdout/stderr, verify they are
actually writable using the new fd_is_writable() helper. If not, fall
back to /dev/null (or reopen the terminal in the TTY case) with a
warning, rather than silently creating a broken setup where output
operations would fail.

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