ECHRNG
Linux / POSIXERRORCriticalDeviceHIGH confidence
Channel Number Out of Range
Production Risk
Linux/STREAMS specific; rarely encountered in modern systems.
What this means
ECHRNG (errno 44) is a Linux-specific error returned by STREAMS drivers when the specified channel number is outside the valid range for the device.
Why it happens
- 1Specifying an invalid channel number in a STREAMS ioctl call
How to reproduce
STREAMS driver ioctl with out-of-range channel.
trigger — this will error
trigger — this will error
// ioctl on STREAMS device with bad channel ioctl(fd, STREAMS_SETCHAN, 9999); // Returns -1, errno = ECHRNG
expected output
ioctl: Channel number out of range (ECHRNG)
Fix
Query valid channel range before use
WHEN When configuring STREAMS channels
Query valid channel range before use
// Query device capabilities first ioctl(fd, STREAMS_GETCHANRANGE, &range); // Use range.min to range.max only
Why this works
Use device-specific ioctls to determine valid channel numbers.
Sources
Official documentation ↗
Linux Programmer Manual errno(3)
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