Fix EINTR handling in read() and readdir() loops#197
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gulrak merged 1 commit intogulrak:masterfrom Dec 28, 2025
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- read(): POSIX specifies that errno is undefined when read() return values are >= 0. The previous retry logic had bugs: When read() returns 0 (EOF), the loop condition checked errno before the return value. Since errno might be stale from a previous call, this could trigger a false retry on EOF. - readdir(): When readdir() reaches the end of directory, it returns NULL without modifying errno. Setting errno=0 before the loop caused an infinite loop.
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Good find! Thank you for the fix! |
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read(): POSIX specifies that errno is undefined when read() return values are >= 0. The previous retry logic had bugs: When read() returns 0 (EOF), the loop condition checked errno before the return value. Since errno might be stale from a previous call, this could trigger a false retry on EOF.
readdir(): When readdir() reaches the end of directory, it returns NULL without modifying errno. Setting errno=0 before the loop caused an infinite loop.
#146