RE: TCP/IP Sockets

Buck:

I played around with this briefly also... and I found that, when I set
non-blocking IO, and did a read... the read would not wait for data to be
received.  With blocking IO, read waits until it gets some data.

david

> -----Original Message-----
> From: Buck Calabro [mailto:mcalabro@commsoft.net]
> Sent: Friday, June 04, 1999 8:26 AM
> To: 'RPG400-L@midrange.com'
> Subject: RE: TCP/IP Sockets
> 
> 
> >First I want to thank everyone for their support.  I have my 
> socket client
> >working, with one minor glitch.  It will wait forever for a 
> response from
> >the socket server.  I want to timeout after xx seconds.  the send and
> >receiver timer options are not supported.  Once I have 
> connected to the
> >server, how does one timeout if the server does not respond 
> to a request.
> >My program just sits at TIMW.  I am using an "AF_INET / SOCK_STREAM"
> >connection.  I am the client.  If the server is hung, I want 
> to close the
> >connection and establish a new connection then resend the 
> transaction.  I
> do
> >not now how to control this timeout value.  Any suggestions will be
> >appreciated.
> 
> Chris,
> While not an expert, I think you need to set the non-blocking 
> flag.  There's
> a section in the OS/400 Sockets Programming manual about 
> Non-blocking I/O
> that talks about this.  Here's some code that I've been tinkering.  I
> haven't been able to verify if it's correct yet though... The 
> "hot" project
> I was working on got cold!
> 
>                                                       
>  * Set the I/O Blocking                               
>  *                                                    
> D IOCtl           PR            10I 0 EXTPROC('ioctl')
> D                               10I 0 VALUE           
> D                               10U 0 VALUE           
> D                                 *   VALUE           
>                                                              
>  *                                                           
>  * Fields for the IO Blocking Options process                
>  *                                                           
> D FIONBIO         S             10U 0 INZ(131074)            
> D SockIO_Off      S             10I 0 INZ(1)                 
> D Sock_IOPOf      S               *   INZ(%ADDR(SockIO_Off)) 
>                                                      
>  * Set the non block attribute                       
> C                   Eval      rc = IOCtl(sd: FIONBIO:
> C                                        Sock_IOPOf) 
> C                   If        rc < 0                 
> C                   CallP     close(sd)              
> C                   Dump                             
> C                   Eval      *InLR=*On              
> C                   Return                           
> C                   EndIf                            
> 
> do the read() or write()
> 
> Buck Calabro
> Billing Concepts Albany, NY
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