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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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FSEEKO(3) Linux Programmer's Manual FSEEKO(3)
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
(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.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────────────┼───────────────┼─────────┤
│fseeko(), ftello() │ Thread safety │ MT-Safe │
└───────────────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, SUSv2.
fseek(3)
This page is part of release 4.15 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)
Pages that refer to this page: fseek(3), open_memstream(3), feature_test_macros(7)
Copyright and license for this manual page
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