What does errno 37 (ECHRNG) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Channel number out of range

Could be also:
Constant	Type	OS
KERN_TERMINATED	Kern return	Mac
ippStsUnknownCacheSize	Intel Ipp Status	Any
ENOLCK	errno	Linux
EALREADY	errno	Mac
NPFS_FILE_SYSTEM	BugCheck Code	Windows

Previous	Next
EALREADY	ENOSYS

ECHRNG

The channel namespace is interface-specific

ECHRNG is errno 37 in Solaris and illumos and is labeled Channel number out of range. Oracle's current catalog does not attach it to a general modern syscall, and POSIX does not define the name. The valid range therefore comes from the legacy producer's channel model.

This is more specific than a generic EINVAL: a selected channel number failed a range constraint. It is also different from ELNRNG, which refers to a link number. Treating both pages as identical “old driver” errors hides the field that should be captured.

Capture the rejected channel value

Log the channel number, configured maximum, and interface version at the call site that returns errno 37.
Check integer truncation and stale constants when ported code passes channel identifiers across structures or ABIs.
If only a numeric errno is available from another platform, verify its source headers before assigning the Solaris ECHRNG name.

References

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