net/usrsock: Fix EPIPE loop by clearing POLLIN on remote close #17877
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Clear USRSOCK_EVENT_RECVFROM_AVAIL flag when remote closes connection during accept to prevent repeated POLLIN events and EPIPE loop. Signed-off-by: daichuan <daichuan@xiaomi.com>
In usrsock_pollsetup, only set POLLIN if USRSOCK_EVENT_RECVFROM_AVAIL is set when remote is closed, avoiding invalid POLLIN events. Signed-off-by: daichuan <daichuan@xiaomi.com>
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Area: Networking
xiaoxiang781216
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Jan 14, 2026
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This commit must be applied after apache/nuttx-apps#3340. |
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Summary
This PR addresses an issue where
usrsockrepeatedly setsPOLLINevents when the network interface is down and a client attempts to connect, leading to an infinite loop or abnormalEPIPEsetting.The changes involve:
USRSOCK_EVENT_RECVFROM_AVAILflag when a remote connection is closed duringaccept.USRSOCK_EVENT_RECVFROM_AVAILflag before settingPOLLINin bothpoll_eventandusrsock_pollsetup.By ensuring
POLLINis only set when data is actually available (indicated by the flag), we prevent the repetitivePOLLINtriggering that causes theEPIPEloop.Impact
usrsockwhen handling connection attempts on a down interface.Testing
POLLINis no longer repeatedly set when the remote closes the connection during an accept sequence on a down interface.tools/checkpatch.sh.