How much Linux software runs on eCos?

I read somewhere that eCos is API compatible with Linux so most Linux
software can be compiled and run on eCos. To what extent is this valid?

Thanks in advance.

> I read somewhere that eCos is API compatible with Linux so most Linux
> software can be compiled and run on eCos. To what extent is this valid?

I'd call this a dangerous statement. There are API similarities, but
the OSes are very different, and the target market is very different
too. Some Linux software may compile and link against the eCos library
without source patching - not terribly much of it, I think -  but this
is only part of the job of porting.