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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 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 reβ turn 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. 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). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βfseeko(), ftello() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO POSIX.1-2001, POSIX.1-2008, SUSv2. NOTES The declarations of these functions can also be obtained by defining the obsolete _LARGEFILE_SOURCE feature test macro. SEE ALSO fseek(3) 2021-03-22 FSEEKO(3)