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  FERROR

  .  Summary

  ferror(int <fh>);

  .  Description

  The ferror function checks the error flag for a file represented by
  the file handle <fh>. The error flag stays set until it is cleared
  with fclearerr or the file is closed.

  .  Return Value

  A non-zero (TRUE) value is returned if the file's error flag is set.

  .  Example

  int f;
  f = fopen("test.dat", "r");       // open file only for reading
  fputs("This should set the error flag!", f);
  if (ferror(f))
   prints("Error writing to file!");