pSOSystem System Calls - Read

select pNA+ System Calls
Return Value
Error Codes
See Also
}
}
if (FD_ISSET(s1, &read_mask))
{
/* socket 1 has data available */
}
if (FD_ISSET(s2, &read_mask))
{
/* socket 2 has data available */
}
If two tasks attempt to use select() on the same socket for the same conditions,
an error occurs.
A -1 is returned if an error occurs and the socket descriptor masks remain
unchanged; a 0 is returned if a timeout occurs. On success a nonzero value is
returned that indicates the number of descriptors on which events have occurred.
Hex Mnemonic Description
0x5009 EBADS The socket descriptor is invalid.
0x504A ECOLL Collision in select(); these conditions
have already been selected by
another task.
accept, connect, recv, send
4-56 pSOSystem System Calls