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Restore the startup O_NONBLOCK state of standard descriptors before execve(), preserving other file status flags and terminal settings. Save all flags before changing them so failed calls also restore shared stdout and stderr correctly. Assisted-by: Codex Signed-off-by: MK <fengmk2@gmail.com>
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Save errno and restore the descriptor and status flags before creating an error, whose inherited property setters can execute JavaScript. Check the flags from an inherited setter while the child remains alive. Keep the test cases and assertions in JavaScript and use Python for the POSIX descriptor setup and observations. Assisted-by: Codex Signed-off-by: MK <fengmk2@gmail.com>
Restore stdio explicitly at both failure exits after saving errno and before constructing the JavaScript error. Remove the cleanup scope and error-routing variables while preserving the blocking-mode policy. Clarify that the startup-mode check compares the underlying file. Assisted-by: Codex Signed-off-by: MK <fengmk2@gmail.com>
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Opening a standard stream can set
O_NONBLOCKon its file descriptor.process.execve()passes this state to the replacement program, where I/O can fail withEAGAIN.Restore the startup blocking mode for standard descriptors that still refer to their original files or streams. Preserve other status flags and terminal settings. Save all standard stream flags before changes, and restore them if execution fails. This also handles shared
stdoutandstderrdescriptors, such as2>&1.Fixes: #66824
Codex (GPT-6) helped investigate and fix this issue.