FSEEKO(3) manual page
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fseeko, ftello - seek to or report file position
#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)
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.
On successful completion, fseeko() returns 0,
while ftello() returns the current offset. Otherwise, -1 is returned and
errno is set to indicate the error.
See the ERRORS in fseek(3)
.
These
functions are available under glibc since version 2.1.
SUSv2,
POSIX.1-2001.
These functions are found on System V-like systems.
fseek(3)
This page is part of release 3.78 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/.
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