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   filelength

   Usage
   #include <io.h>
   long filelength(int fd);

   Description
   fileno  returns  the length in bytes of the file associated  with  the
   file  descriptor  fd. The fd argument must point to a  file  which  is
   already open.

   The  filelength function differs from filesize in that it can be  used
   on a file which is already open.

   Example
   #include <stdio.h>
   #include <io.h>
   #include <fcntl.h>

   main(argc,argv)
   int argc;
   char *argv[];
   {
   int fd;
   long l;

        if(argc < 2)
        {
             printf("Usage: fl 'filename'\n");
             exit(1);
        }

        fd = open(argv[1],O_RDONLY,0);
        if(fd == -1)
        {
             perror("Error opening file");
             exit(1);
        }
        l = filelength(fd);

        printf("File %s is %ld bytes long\n",argv[1],l);

        if(close(fd) == -1);
             perror("Error closing file");

        return 0;
   }

   Return Value
   filelength returns the length of the file in bytes as a long  integer.
   The current read/write position within the file is unaltered.