FTELL(3P)                                           POSIX Programmer's Manual                                          FTELL(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       ftell, ftello - return a file offset in a stream

SYNOPSIS
       #include <stdio.h>

       long ftell(FILE *stream);


       off_t ftello(FILE *stream);


DESCRIPTION
       The ftell() function shall obtain the current value of the file-position indicator for the stream pointed to by stream.

       The ftello() function shall be equivalent to ftell(), except that the return value is of type off_t.

RETURN VALUE
       Upon  successful completion, ftell()  and ftello()  shall return the current value of the file-position indicator for the
       stream measured in bytes from the beginning of the file.

       Otherwise, ftell()  and ftello()  shall return -1, cast to long and off_t respectively, and set  errno  to  indicate  the
       error.

ERRORS
       The ftell()  and ftello()  functions shall fail if:

       EBADF  The file descriptor underlying stream is not an open file descriptor.

       EOVERFLOW
              For ftell(), the current file offset cannot be represented correctly in an object of type long.

       EOVERFLOW
              For ftello(), the current file offset cannot be represented correctly in an object of type off_t.

       ESPIPE The file descriptor underlying stream is associated with a pipe or FIFO.


       The ftell() function may fail if:

       ESPIPE The file descriptor underlying stream is associated with a socket.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fgetpos(), fopen(), fseek(), lseek(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open  Group
       Standard   is   the   referee   document.   The   original   Standard   can   be   obtained  online  at  http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                     FTELL(3P)