fseeko, ftello - seek to or report file position
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)):
_FILE_OFFSET_BITS == 64 ||
_POSIX_C_SOURCE >= 200112L
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.
(defining the obsolete _LARGEFILE_SOURCE macro also works)
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
On successful completion, fseeko() returns 0, while ftello()
returns the current offset. Otherwise, -1 is returned and errno is set
to indicate the error.
These functions are available under glibc since version 2.1.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, SUSv2.
This page is part of release 5.04 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/.
|fseeko (), ftello ()