Whenever the ini file instrument encounters an error that reports through
errno (error in an ANSI C function), it calls a function to translate that error into a CVI specific error code. The following function (from inifile.c) does this job:
static int Ini_GetErrCodeFromWriteErrno(int errnoVal, int forceError)
{
switch (errnoVal)
{
case 0:
return forceError ? UIEIOError : UIENoError;
case EPERM:
case EACCES:
return UIEAccessDenied;
case ENOMEM:
return UIEOutOfMemory;
case ENOSPC:
return UIEDiskFull;
case EBUSY:
case EIO:
case ENXIO:
return UIEIOError;
default:
return UIEIOError;
}
}
If you need more granularity in detecting this error, you have a few options.
1. You could attach the .ini instrument for debugging, and simply place a breakpoint in this function and examine the value of errno encountered. This would also allow you to look up the stack for the exact location of the problem and possibly gain some insight from that.
2. You could modify this function (for example, to log the exact value of errno, or print it to stderr) and recompile the instrument object and your project.
Something like this:
static int Ini_GetErrCodeFromWriteErrno(int errnoVal, int forceError)
{
switch (errnoVal)
{
case 0:
if (forceError)
{
fprintf(stderr, "Unknown error occured; not reported through errno.\n");
return UIEIOError;
}
return UIENoError;
case EPERM:
case EACCES:
return UIEAccessDenied;
case ENOMEM:
return UIEOutOfMemory;
case ENOSPC:
return UIEDiskFull;
case EBUSY:
fprintf(stderr, "Device or resource busy");
return UIEIOError;
case EIO:
fprintf(stderr, "I/O Error");
return UIEIOError;
case ENXIO:
fprintf(stderr, "No such device or address");
return UIEIOError;
default:
fprintf(stderr, "Unspecified error occured; errno = %d. Lookup this error code in errno.h.", errnoVal);
return UIEIOError;
}
}
Hope this helps,
-alex
