ENOANO
Linux / POSIXERRORCriticalDeviceHIGH confidence
No Anode
Production Risk
Very rare; STREAMS-specific resource exhaustion.
What this means
ENOANO (errno 55) is a Linux/STREAMS-specific error returned when no anode is available for a STREAMS driver operation.
Why it happens
- 1STREAMS driver anode allocation failure
How to reproduce
STREAMS driver anode unavailable.
trigger — this will error
trigger — this will error
// errno = ENOANO from STREAMS driver
expected output
No anode (ENOANO)
Fix
Free STREAMS resources
WHEN After ENOANO
Free STREAMS resources
// Close unused STREAMS fds to release anodes close(unused_streams_fd);
Why this works
Anodes are limited kernel resources; releasing other STREAMS fds frees them.
Sources
Official documentation ↗
Linux Programmer Manual errno(3)
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