Fix EINTR handling in cat, od, and comm #8946
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Add proper retry loops for ErrorKind::Interrupted in I/O operations to handle signals like SIGUSR1 that can interrupt read/write calls. This pattern is proven in production - identical to PR uutils#6025 (merged March 2024) which fixed dd's EINTR handling for GNU test dd/stats.sh. The same pattern is already used in 9+ utilities (head, tail, tee, wc, sort, sum, tr, shuf, dd) without issues. Changes: - cat: Fix write_fast() and write_lines() to retry on EINTR - od: Fix PartialReader::read() in all three read paths - comm: Fix are_files_identical() for both file readers - tests: Add InterruptingReader/Writer test utilities Historical context: - Pattern validated by cre4ture's PR uutils#6025 (dd EINTR fix) - Matches existing implementations in dd/dd.rs:450,881 - POSIX best practice for signal-interrupted I/O Fixes uutils#1275
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sylvestre
reviewed
Oct 18, 2025
sylvestre
reviewed
Oct 18, 2025
Add proper retry loops for ErrorKind::Interrupted in I/O operations to handle signals like SIGUSR1 that can interrupt read/write calls. Pattern matches PR uutils#6025 (dd EINTR fix) and is already used in 9+ utilities. Changes: - cat: Fix write_fast() and write_lines() to retry on EINTR - od: Fix PartialReader::read() in all three read paths - comm: Fix are_files_identical() for both file readers - tests: Add visible EINTR integration tests for CI Addresses sylvestre's review feedback on code documentation and CI test visibility.
- Fix comm test: use stdout_contains instead of stdout_only for tabbed output - Fix od test: create new command instance to avoid 'already run this UCommand' error - Remove unused imports and dead code to eliminate compiler warnings - Both tests now pass without warnings or errors
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…onaries - Add EINTR, eintr, nextest to jargon.wordlist.txt (technical/systems programming terms) - Add SIGUSR, SIGINT, etc. to shell.wordlist.txt (POSIX signals) - Add uutils, coreutils, ucmd, etc. to workspace.wordlist.txt (project-specific terms) - Fixes CI cspell warnings for legitimate technical terminology - Proper categorization follows existing dictionary structure
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This adds proper signal interruption handling to cat, od, and comm. When read or write operations get interrupted by signals like SIGUSR1, these utilities now retry instead of failing.
The pattern used here is identical to #6025 from March 2024 that fixed dd's signal handling for the GNU test suite. That same retry-on-interrupted pattern is already working in 9 other utilities including head, tail, tee, wc, sort, sum, tr, and shuf.
Closes #1275