Re: Sockets programming in RPG-ILE

[Buck Calabro/commsoft<mcalabro@xxxxxxxxxxxx>]

On 02/10/99 02:24:37 AM Jocke Berggren  wrote:

>I'we seen some prototype definitions around but no one have
>the select() function, I want to use select() instead of recv() in a
>socket server, cause I dont know how to handle timeout on a revc().

I haven't converted the server example fromC to RPG IV, but I have used 
recv() in RPG IV.  fcntl() allows you to change the socket to non-blocking 
mode, which means that it won't wait for input, but immediately return from 
a read() and other I/O operations.  The Unix-Type API book has some good 
references to copy from, which is where I found fcntl().  After the open(), 
I used fcntl to set the socket to non-blocking, which works in C but not in 
RPG IV.  The C code is:
#include <fcntl.h>
#define  F_SETFL_i = 7
#define O_NONBLOCK_i = 220
rc = fcntl(sd, F_SETFL, O_NONBLOCK);

The RPG IV code is:
D  rc             S             10I 0 Inz
D  F_SETFL        S             10I 0 Inz(7)
D  O_NONBLOCK     S             10I 0 Inz(00200)
D fcntl_NB        PR                  Extproc('fcntl') Like(rc)
D                               10I 0 Value 
D                               10I 0 Value 
D                               10I 0 Const 
C                   Eval      rc=fcntl_NB(sd: F_SETFL: O_NONBLOCK)

When I run the RPG code, I get an "invalid argument" error.  I'm going to 
tinker a bit with select() in a few days.  I need to get the client side 
going first!

Buck Calabro
CommSoft, Albany, NY
mailto:mcalabro@commsoft.net
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