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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 differ (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-posi-
       tion 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  cor-
              rectly in an object of type long.
       EOVERFLOW
              For ftello(), the current file offset cannot be represented cor-
              rectly 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, 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 Standard, 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)