EBADSLT
Linux / POSIXERRORNotableDeviceHIGH confidence
Invalid Slot
Production Risk
Linux device driver-specific programming error.
What this means
EBADSLT (errno 57) is a Linux-specific error returned when an invalid slot number is specified for a device or STREAMS operation.
Why it happens
- 1Specifying a slot number outside the valid range for the device
How to reproduce
Device ioctl with invalid slot number.
trigger — this will error
trigger — this will error
// errno = EBADSLT when slot number is out of range
expected output
Invalid slot (EBADSLT)
Fix
Query valid slot range before use
WHEN When specifying slot numbers for device ioctls
Query valid slot range before use
// Query device for number of valid slots ioctl(fd, DEVICE_GET_SLOT_COUNT, &count); // Use slot 0 to count-1 only
Why this works
Always query the device for its valid slot range before addressing a specific slot.
Sources
Official documentation ↗
Linux Programmer Manual errno(3)
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