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di_source.c File Reference

A source of data that sends same out over TCP. More...

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <stdint.h>
#include "di194.h"

Go to the source code of this file.

Functions
int	socket_make (void)
	Create server socket, ready for accept().
void	sighandler (int signal)
	Control-break handler. Sets global flag to indicate exit request.
int	daq_loop (const int CLIENT_SOCKET, const int USEC_DELAY)
	Read data, convert to ASCII, send out over port.
void	main_loop (const int usec_delay)
	Setup a socket, wait for a connection, start streaming.
int	main (int argc, char *argv[])
	Driver / test routine to exercise the DI code.
Variables
const int	SRV_PORT = 31337
	TCP server port.
const int	QUEUE_LENGTH = 64
	TCP connection queue length.
bool	do_exit
	Global boolean set by signal handler to force exit.

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Detailed Description

A source of data that sends same out over TCP.

This file implements a simple daemon process for sourcing data from the DI-194. It waits for a TCP connection to its port, at which point it starts reading data (currently a fixed rate) which it converts to ASCII and sends it out over the port.

Intended use is for testing SOAP, meaning that ASCII will need to become XML/XSIL.

To test this, start di_source and then telnet to localhost, port 31337 - you should see streaming data!

Author:

Paul Hubbard

Date:

5/19/02

Definition in file di_source.c.

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Function Documentation

int daq_loop (  const int  CLIENT_SOCKET, const int  USEC_DELAY )

Read data, convert to ASCII, send out over port. Note: Runs until control-c detected or error occurrs Tries environment var DI194_PORT USEC_DELAY ignored for now; sends full rate Parameters: CLIENT_SOCKET  File descriptor of clients' TCP socket USEC_DELAY  Is ignored for now; crude rate setting Definition at line 159 of file di_source.c. References daq_reading_t::analog, di_close(), di_daq_sync(), di_open(), di_read(), di_start(), daq_reading_t::digital, and do_exit.

int main (  int  argc, char *  argv[] )

Driver / test routine to exercise the DI code. Note: Uses contents of "DI194_PORT" if set Main. Open the port, init the card, do some daq. Too: -p port parsing, will need for USB serial. getopt! Parameters: argc  Argc as passed by shell argv  Argv as passed by shell Returns: 0 All is good Non-zero All is not good Definition at line 318 of file di_source.c. References do_exit, main_loop(), and sighandler().

void main_loop (  const int  usec_delay  )

Setup a socket, wait for a connection, start streaming. Date: 5/20/02 Parameters: usec_delay  Delay, in microseconds, between samples Definition at line 240 of file di_source.c. References daq_loop(), do_exit, and socket_make().

void sighandler (  int  signal  )

Control-break handler. Sets global flag to indicate exit request. Assumes Installed in interrupt chain by someone else Parameters: signal  Signal number Date: 3/25/02 Definition at line 139 of file di_source.c. References do_exit.

int socket_make (  void   )

Create server socket, ready for accept(). Note: Uses compiled vars SRV_PORT and QUEUE_LENGTH Borrowed from FNAL server code Date: 5/19/02 Return values: >  0 (Socket, OK) <=0  (Error) Definition at line 50 of file di_source.c. References QUEUE_LENGTH, and SRV_PORT. Referenced by main_loop().

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Variable Documentation

bool do_exit

Global boolean set by signal handler to force exit. Definition at line 40 of file di_source.c.

const int QUEUE_LENGTH = 64

TCP connection queue length. Definition at line 38 of file di_source.c. Referenced by socket_make().

const int SRV_PORT = 31337

TCP server port. Definition at line 36 of file di_source.c. Referenced by socket_make().

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