fseeko(3) -- Linux man page
NAMEfseeko, ftello - seek to or report file position
#include <stdio.h> int fseeko(FILE *stream, off_t offset, int whence); off_t ftello(FILE *stream); .fi
DESCRIPTIONThe fseeko() and ftello() functions are identical to fseek() and ftell() (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 many architectures both off_t and long are 32-bit types, but compilation with
#define _FILE_OFFSET_BITS 64
NOTESThese functions are found on SysV-like systems. They are not present in libc4, libc5, glibc 2.0 but available since glibc 2.1.
CONFORMING TOThe fseeko and ftello functions conform to SUSv2.