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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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fseeko(3) Library Functions Manual fseeko(3)
fseeko, ftello - seek to or report file position
Standard C library (libc, -lc)
#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
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).
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ fseeko(), ftello() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
glibc 2.1. POSIX.1-2001, SUSv2.
The declarations of these functions can also be obtained by
defining the obsolete _LARGEFILE_SOURCE feature test macro.
fseek(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-05-02 fseeko(3)
Pages that refer to this page: fseek(3), off_t(3type), open_memstream(3), feature_test_macros(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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