FSEEKO(3) - man page online | library functions

Seek to or report file position.

FSEEKO(3)                           Linux Programmer's Manual                           FSEEKO(3)

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 || _XOPEN_SOURCE >= 600 (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_OFF‐ SET_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 │ └───────────────────┴───────────────┴─────────┘
SEE ALSO fseek(3)
COLOPHON This page is part of release 4.04 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
2015-08-08 FSEEKO(3)
This manual Reference Other manuals
fseeko(3) referred by explain(1) | explain(3) | explain_fseeko(3) | explain_fseeko_or_die(3) | explain_ftello(3) | explain_ftello_or_die(3) | feature_test_macros(7) | fmemopen(3) | fseek(3) | perlsolaris(1)
refer to attributes(7) | feature_test_macros(7) | fseek(3)