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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 dif-
       fer (consult 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  indica-
       tor 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 indi-
       cate 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions Issue 6, Copyright (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 Stan-
       dard, the original IEEE and The Open Group Standard is the referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                            FTELL(3P)