Function _sys_ensure

components/libc/compilers/armlibc/syscalls.c:255–263

* Flush any OS buffers associated with fh, ensuring that the file * is up to date on disk. Result is >=0 if OK, negative for an * error. * This function is deprecated. It is never called by any other library function, * and you are not required to re-implement it if you are retargeting standard I/O (stdio). */

 * and you are not required to re-implement it if you are retargeting standard I/O (stdio).
 */
int _sys_ensure(FILEHANDLE fh)
{
#ifdef DFS_USING_POSIX
    return fsync(fh);
#else
    LOG_W("%s: %s", __func__, _WARNING_WITHOUT_FS);
    return 0; /* error */
#endif /* DFS_USING_POSIX */
}

/*
 * Move the file position to a given offset from the file start.