fseeko(3) Library Functions Manual fseeko(3) fseeko, ftello - LIBRARY Standard C library (libc, -lc) #include int fseeko(FILE *stream, off_t offset, int whence); off_t ftello(FILE *stream); glibc (. feature_test_macros(7)): fseeko(), ftello(): _FILE_OFFSET_BITS == 64 || _POSIX_C_SOURCE >= 200112L fseeko() ftello() fseek(3) ftell(3) ( fseek(3)), , , offset fseeko() ftello() long off_t. off_t long 32- , _FILE_OFFSET_BITS 64 ( - ), off_t 64- . fseeko() 0, ftello() . -1, errno . fseek(3). attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |fseeko(), ftello() | | 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) Azamat Hackimov , Dmitry Bolkhovskikh , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . fseeko(3)