Re: [ECOS] socket times out, but not with printf

["mailsagr at yahoo dot com" <mailsagr at yahoo dot com>]

thanks Andrew, for the mail.

i turned on Asserts now. and when i boot up this is
what it gives me:
[cyg_net_init] Init: mbinit(0x00000000)
[cyg_net_init] Init: cyg_net_init_devs(0x00000000)
Init device 'i82559_eth0'
ASSERT FAIL: <1>intr.cxx[619]static void
Cyg_Interrupt::mask_interrupt() Invalid vector
ASSERT FAIL: intr.cxx            [ 619] static void
Cyg_Interrupt::mask_interrupt()
                                 Invalid vector

Earlier, before turning on asserts, after the 230KB
limit this is what i have observed on ethereal. The
tcp client on eCos keeps sending tcp pkts with payload
= 0 bytes. it keeps on sending these pkts with the
same sequence no. hoping to get ACKs from the server.
The server sees these SEQ pkts and sends the
approprite ACK. However eCos client never seems to see
these ACKs so it continues to send the same SEQ nos
again and again for a long time. In the mean time the
select call on the client times out.

For some reason(probably due to the bogus intr vector)
the client tcp stack doesnt seems to be receiving data
from driver after this initial read of 230 KB. And the
printf seems to be doing something that makes it work.
The printf is actually printing to my telnet session.
And Redboot is taking care of that. 

Redboot has ip 192.168.0.10 and my eCos app has an ip
192.168.0.100 (both configured statically though
configtool). 

How do I resolve this now.

Appreciate your help. Thanks again
Sagar

--- Andrew Lunn <andrew@lunn.ch> wrote:
> You code looks OK. The extra printf is probably
> changing the timing
> somehow. Do you have assert's enabled? If not turn
> them on. 
> 
> Also, can you ping the device once its got into its
> blocked state
> after 230KB. 
> 
>       Andrew
> 
> 
> On Fri, Sep 05, 2003 at 05:14:53PM -0700,
> mailsagr@yahoo.com wrote:
> > hello,
> > 
> > i have been trying to get a simple tcp client to
> work
> > with a tcp server.
> > 
> > The server(sitting on my linux machine) just
> listens
> > on a port say 5000. All it does is wait for a
> > connection from a client. When it does receive
> one, it
> > just pumps in a large amount of data (around 7 to
> 8
> > MB).
> > 
> > The client is a straightforward tcp client that
> > connects to the tcp server and tries to read in 7
> to
> > 8MB of the data pumped in by server. Now this
> works
> > when both the client and server are running on a
> > desktop.
> > 
> > But when i run the client on eCos, it can only
> > download 230KB of data and then the select call
> times
> > out. 
> > 
> > This happens every time. The timeout value is
> large
> > like 30 secs. Even if there is no select statement
> and
> > i directly use a blocking read, to read in 7 MB of
> > data, it just stops working after 230KB. One the
> > server side, it is just waiting to send more data
> to
> > client and the byte count sent to client reads
> 230KB.
> > I have fiddled around with the thread priority,
> buffer
> > size, ...., but they dont work.
> > 
> > Surprisingly if i put a printf statment after the
> read
> > call, and print something to the screen, then it
> just
> > goes ahead and downloads the entire contents
> (7MB).
> > What does this printf statement do that makes the
> > client work. I tried replacing it with
> fflush(stdout)
> > but that doesnt work. Do i need to do anything
> > different with my eCos configuration. I have also
> > observed this when i try using a libxml parser on
> > eCos. when i have to parse a long doc (7MB) it
> just
> > bails out in between, after parsing some amount of
> > data. But if i print to stdout some info after it
> > encounters some tag (in a callback function), then
> it
> > works just fine.
> > 
> > The eCos config is a standard 'net' template on a
> i386
> > HAL. It has a RAM disk and i82559 driver with
> FreeBSD.
> > I dont think it has anyting to do with FreeBSD and
> > 82559 since it works with the printf statements.
> > 
> > Any help would be appreciated.
> > 
> > Thanks
> > Sagar
> > 
> > 
> > /* tcpclient.c
> > */
> > int
> > connect(char *addr, unsigned short port)
> > {
> > 	struct sockaddr_in sock_name;
> >   	int sock, save_errno;
> > 	int errcode=0;
> > 
> > 	memset(&sock_name, 0, sizeof(sock_name));
> > 	// Set port and protocol
> > 	sock_name.sin_family = AF_INET;
> > 	sock_name.sin_port = htons (port);
> > 	sock_name.sin_addr.s_addr = inet_addr(addr);  
> > 	#ifdef __ECOS
> > 	sock_name.sin_len = sizeof(sock_name);
> > 	#endif
> > 
> > 	// Make an internet socket, stream type.
> > 	sock = socket (AF_INET, SOCK_STREAM, 0);
> > 	if (sock < 0)
> > 		return -1;
> > 
> > 	// Connect the socket to the remote host.
> > 	if ((errcode=connect (sock, (struct sockaddr
> > *)&sock_name, sizeof (sock_name))) < 0)
> > 	{
> > 		close (sock);
> > 		return -1;
> > 	}
> > 
> >  	return sock; 
> > }
> > 
> > int client_start(char *ip, unsigned short port,
> int
> > bytes_to_read)
> > {
> > 	int nbytes=0, ret=0;
> > 	double timeout = 15;
> > 	char buff[1024];
> > 	int fd = connect_to_one(ip, port);
> > 	
> > 	while(nbytes<bytes_to_read) {
> > 		ret = read(fd, buff, sizeof(buff));
> > 		if(ret<0) {
> > 			return -1;
> > 		}
> > 		nbytes += ret;
> > 		/*
> > 		This is the read call that I was referring to
> which
> > removes the 230 KB
> > 		read limit on the client side.
> > 		*/
> > 		printf("read=%d bytes\n");
> > 	}
> > 	printf("tot bytes read=%d bytes\n", nbytes);
> > 	return nbytes;
> > }
> > 	
> > 
> > /* File framework.c
> > */
> > 
> > 
> > #include <stdio.h>
> > #include <cyg/fileio/fileio.h>
> > #include <network.h>
> > 
> > #define MAIN_THREAD_PRIORITY
> > CYGPKG_NET_THREAD_PRIORITY-4
> > #define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL
> +
> > 0x20000)
> > 
> > static char stack[STACK_SIZE];
> > static cyg_thread thread_data;
> > static cyg_handle_t thread_handle;
> > 
> > #define ROOTFS "/"
> > 
> > int init_network(void)
> > {
> > 	init_all_network_interfaces();
> > 	
> > 	if(eth0_up) {
> > 		printf("eth0 is up and running ....\n");
> > 	} else {
> > 		printf("eth0 is not up yet.\n");
> > 		return -1;
> > 	}
> > 	printf("Network initialization done.\n");
> > 
> > 	return 0;
> > }
> > 
> > int cleanup_ecos()
> > {
> > 	umount(ROOTFS);
> > 	return 0;
> > }
> > 
> > int start_tests();
> > 
> > void init_ecos(cyg_addrword_t param)
> > {
> > 	init_network();
> > 	
> > 	if(mount("", ROOTFS, "ramfs")<0) {
> > 		printf("Error: Unable to create a Ramdisk\n");
> > 		return;
> 
=== message truncated ===


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