FSEEKO(3)                           Linux Programmer's Manual                           FSEEKO(3)



NAME
       fseeko, ftello - seek to or report file position

SYNOPSIS
       #include <stdio.h>

       int fseeko(FILE *stream, off_t offset, int whence);

       off_t ftello(FILE *stream);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fseeko(), ftello():
           _FILE_OFFSET_BITS == 64 || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
           (defining the obsolete _LARGEFILE_SOURCE macro also works)

DESCRIPTION
       The fseeko() and ftello() functions are identical to fseek(3) and ftell(3) (see fseek(3)),
       respectively, except that the offset argument of fseeko() and the return value of ftello()
       is of type off_t instead of long.

       On  some  architectures,  both  off_t  and  long are 32-bit types, but defining _FILE_OFF‐
       SET_BITS with the value 64 (before including any header files)  will  turn  off_t  into  a
       64-bit type.

RETURN VALUE
       On  successful  completion, fseeko() returns 0, while ftello() returns the current offset.
       Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS
       See the ERRORS in fseek(3).

VERSIONS
       These functions are available under glibc since version 2.1.

CONFORMING TO
       SUSv2, POSIX.1-2001.

NOTES
       These functions are found on System V-like systems.

SEE ALSO
       fseek(3)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



                                            2014-10-02                                  FSEEKO(3)