select() - return error code 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

 

[PHV]

On my SCO boxes (5.0.[5-7]) the

man S select

output for [EINVAL] is:
The specified time limit is invalid. One of its components is negative or too large. Or, the device driver being polled has not implemented select support.

Hope This Help
PH.