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EBADSLT
EBADSLT: Linux legacy errno
EBADSLT (errno 3) reports that a slot ordinal is outside the active table used by a legacy compatibility interface. These names come from historical System V/XENIX compatibility interfaces; on modern Linux they usually point to a driver, STREAMS-compatibility layer, or legacy IPC contract rather than a general filesystem error.
Evidence to capture
Record slot number, table size/generation, device or IPC object, and lookup operation. Save errno immediately after the failing call, together with its return value, because later library or logging calls can overwrite thread-local error state.
Focused test
test the highest known-valid slot and the failing slot without rebuilding the table. Keep the process, device/endpoint and deployed driver version fixed so the comparison changes only the suspected boundary.
Correction
correct the slot index or refresh the table generation that produced it. If the interface is provided by a compatibility driver, verify its documented ABI and object lifetime instead of assuming that a numerically similar errno from another UNIX has the same contract.
Verification
Repeat the original system call and confirm it passes the former EBADSLT boundary with the same object identity. If another errno appears, preserve it as a separate result from the next failing operation.
Technical references
- Linux man-pages: errno(3)
- Linux kernel: asm-generic errno definitions
- GNU C Library: error codes
- illumos: STREAMS programming documentation
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