Reading from files in Nios II simulation

[Altera_Forum]

Hi, 

 I've created a simulation setup for a Nios II cpu design using SOPC Buillder and Nios II IDE to generate all of the required simulation files, converted everything to run using NCSim on a UNIX environment. I've had no trouble with the simulations or setup up to this point.  The trouble started when I wanted to write a simple test script to run on the Nios processor to read a input command file and act on the commands with that file, and then write out a log file. However, when it tries to access the file, it prints "Cannot open command input file" to the console window. Below is the C code I'm using to access the HAL file I/O:  # include <stdio.h> # include <stdlib.h> # include <string.h> # include <system.h>  int main () {  FILE *infile = NULL;  FILE *logfile = NULL;    /***************************************************/  /* Open files for access */  /***************************************************/  infile=fopen("Nios_II_cpu_model.in","r");  if (infile == NULL)  {  printf ("Cannot open input command file!\n");  exit(1);  }    logfile=fopen("Nios_II_cpu_model.log","w");  if (logfile == NULL)  {  printf ("Cannot open output log file!\n");  exit(1);  }    /***************************************************/  /* Close the files */  /***************************************************/  fclose(infile);  fclose(logfile);    return 0; }   Anyone have any ideas???  Thanks, Tony