source: tools/FAD/simple_daq/simple_daq.cpp@ 261

/********************************************************************\

  Read SOCKETS_PER_FAD Channels from FAD-Board
  Write Commands to Socket 0, Commands must be (n * 16) Bit long
  
  Usage: SocketClient [IP-Address]
  
  kw, 05.10
  
  based on:
  Generic example for remote control via a socket interface

  Oliver Grimm, March 2009

\********************************************************************/
#ifndef PATH_MAX
#define PATH_MAX 1000
#endif
#include "simple_daq.h"
#include "../SocketFunctions/SocketFunctions.h"


int *SocketDescriptor;

int main(int argc, char *argv[])
{
        // what kind of buffer is this?
        char Buffer[MAX_COM_SIZE];
        
        int read_return;

        fd_set ReadFileDescriptor;
        int max_fd = 0;
        
        FILE* outfile[SOCKETS_PER_FAD];
        char outfilename[PATH_MAX];

        
                SimpleDaqConfiguration *conf;
        // Get configuration file path from command line
        // Get configurarion from configurationfile.
        // such as FAD IP Adress
        if (argc > 1)
        {
                conf = getConfig(argv[1]);
        } else {
                conf = getConfig(CONFIG_FILE_PATH);
        }
        
        // Open sockets
        SocketDescriptor = OpenSockets(SOCKETS_PER_FAD);
        if (SocketDescriptor == NULL) {
                exit_program (EXIT_FAILURE);
        }
        max_fd = GetMaxFileDescriptor(SOCKETS_PER_FAD, SocketDescriptor);
        
        // Connect to server
        if( Connect2Server(     SocketDescriptor, SOCKETS_PER_FAD, FIRST_DAQPORT, conf->FADIPAddress, 1) != SOCKETS_PER_FAD) {
                        // Connect2Server prints some error messages in case of exceptions...
                        printf ("Error in Connect2Server()\n");
                        exit_program (EXIT_FAILURE);
        }

        // Open files for output
        for (int i = 0; i < SOCKETS_PER_FAD; i++)
        {
                sprintf (outfilename, "%s/%s-%d.%s", conf->outfilepath, conf->outfilename, i, conf->outfileext);
                if ((outfile[i] = fopen (outfilename, "w")) == NULL)
                {
                        printf ("Error: Could not open file %s\n", outfilename);
                        exit_program (EXIT_FAILURE);
                }
        }


        signal (SIGPIPE, SIG_IGN); // Do not kill process if writing to closed socket
        signal (SIGINT, int_handler); // Cleanup after SIGINT (CTRL-C)

        // Main loop
        while (true)
        {
                fflush (stdout);

                FD_ZERO (&ReadFileDescriptor);          
                FD_SET(STDIN_FILENO, &ReadFileDescriptor);
                for (int i = 0; i < SOCKETS_PER_FAD; i++)
                {
                        FD_SET (SocketDescriptor[i], &ReadFileDescriptor);
                }

                // Wait for data from sockets
                if (select (((int) max_fd) + 1, &ReadFileDescriptor, NULL, NULL, NULL) == -1)
                {
                        perror ("Error with select()\n");
                        break;
                }
                
                memset (Buffer, 0, sizeof (Buffer));

                // Data from STDIN
                if (FD_ISSET (STDIN_FILENO, &ReadFileDescriptor))
                {
                        fgets (Buffer, MAX_COM_SIZE, stdin);
                        // Send command to socket 0
                        cmd_send (Buffer, SocketDescriptor[0]);                 
                }
                // Data from sockets
                else
                {
                        // Check all sockets
                        for (int i = 0; i < SOCKETS_PER_FAD; i++)
                        {
                                if (FD_ISSET (SocketDescriptor[i], &ReadFileDescriptor))
                                { 
                                        // Only for testing
                                        memset (Buffer, 0xAA, sizeof (Buffer));
                                        if ((read_return = read (SocketDescriptor[i], Buffer, MAX_COM_SIZE)) == 0)
                                        {
                                                printf ("Error: Server not existing anymore, exiting...\n");
                                                exit_program (EXIT_FAILURE);
                                        }
        
                                        if (read_return > 0)
                                        {
                                                printf ("Socket [%d]: Read %d Bytes\n", i, read_return);
                                        
                                                fwrite (Buffer, 1, (size_t) read_return, outfile[i]);
                                                // Important!!!
                                                fflush (outfile[i]);
                                        }
                                }
                        }
                }
        } // while (TRUE)

        exit (EXIT_SUCCESS);
}

// close sockets and exit
void exit_program (int exit_status)
{       
        printf ("\nClosing Sockets...");
        for (int i = 0; i < SOCKETS_PER_FAD; i++)
        {
                close (SocketDescriptor[i]);
        }
        printf (" done\n");
        
        exit (exit_status);
}

// SIGINT
void int_handler (int sig)
{
        exit_program (EXIT_SUCCESS);
}


// note: verbose is not used, but anyway defined.
SimpleDaqConfiguration *getConfig (const char *path, int verbose) {
FILE* ConfigFile;
// try to open config file
// if not exists return NULL
ConfigFile = fopen (path, "r");
if (ConfigFile == NULL) {
        return NULL;
}

//create SimpleDaqConfiguration
SimpleDaqConfiguration *conf = new SimpleDaqConfiguration();

// read config data from file and fill in SimpleDaqConfiguration
fscanf( ConfigFile , "%s" , conf->FADIPAddress );
fscanf( ConfigFile , "%s" , conf->outfilepath );
fscanf( ConfigFile , "%s" , conf->outfilename );
fscanf( ConfigFile , "%s" , conf->outfileext );

return conf;
}