EL2HLT
Linux / POSIXERRORCriticalDeviceHIGH confidence
Level 2 Halted
Production Risk
Rare; STREAMS-specific.
What this means
EL2HLT (errno 51) is a Linux/STREAMS-specific error indicating that level 2 of a layered protocol has halted.
Why it happens
- 1STREAMS device driver level 2 has stopped operation
How to reproduce
STREAMS protocol level 2 halt.
trigger — this will error
trigger — this will error
// errno = EL2HLT when STREAMS level 2 halts
expected output
Level 2 halted (EL2HLT)
Fix
Reinitialize the STREAMS device
WHEN After EL2HLT
Reinitialize the STREAMS device
close(fd);
fd = open("/dev/streams_device", O_RDWR);Why this works
Level 2 halt requires device reinitialization.
Sources
Official documentation ↗
Linux Programmer Manual errno(3)
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