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
           (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_OFFSET_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.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────┬───────────────┬─────────┐
       │Interface          │ Attribute     │ Value   │
       ├───────────────────┼───────────────┼─────────┤
       │fseeko(), ftello() │ Thread safety │ MT-Safe │
       └───────────────────┴───────────────┴─────────┘

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, SUSv2.

SEE ALSO

       fseek(3)

COLOPHON

       This  page  is  part  of  release  5.10  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
       https://www.kernel.org/doc/man-pages/.

                                                   2017-09-15                                          FSEEKO(3)