select() - EINVAL

[greju]

Hi,
I was going through the documentation of the select() subroutine for UNIX and one of the conditions for select() to return EINVAL was

"One of the specified file descriptors refers to a STREAM or
multiplexer that is linked (directly or indirectly) downstream
from a multiplexer"

Could someone tell me what does this mean ?

Thanks,
Reju

 

[Tony48]

Here is the definition of what EINVAL means on a
failed select() call from the AIX 4.3.3
man page:
EINVAL One of the parameters to the select subroutine
contained a value that is not valid.