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   ferror

   Usage
   #include <stdio.h>
   int ferror(FILE *fp);

   Description
   ferror checks the error flag on the stream fp. The error flag  remains
   set  until  a  clearerr, rewind or fseek is issued or  the  stream  is
   closed. No read or write operations can be carried out until this flag
   is cleared.

   Example
   #include <stdio.h>
   main()
   {
   int c;
        if( (c = fgetc(stdin)) == EOF)
        if(ferror(stdin))
        {
             fprintf(stderr,"Read error\n");
             clearerr(stdin);
        }
        printf("No error\n");
   }

   Return Value
   Returns  non-zero  if the error flag is set, otherwise  it  returns  a
   zero.