What does errno 47 (ECANCELED) in Solaris mean?

ECANCELED

Canceled asynchronous operation

ECANCELED is Solaris errno 47 (Operation canceled). A Solaris asynchronous operation was canceled before completion.

Cancellation is a completion outcome, so trace the component that requested it and the point at which the operation became cancelable. A timeout, user cancellation, process shutdown, and dependency failure can all lead to different recovery behavior.

What to check

• Identify the async subsystem: POSIX AIO, timer, cancellation, or another queued operation.
• Distinguish explicit cancellation from timeout and transport failure.
• Do not reuse buffers or descriptors until the completion path is fully accounted for.

References

• Oracle Solaris intro(2): error numbers
• illumos errno.h definitions
• POSIX errno.h