bdflush(2) System Calls Manual bdflush(2) NAME bdflush - start, flush, or tune buffer-dirty-flush daemon SYNOPSIS #include int bdflush(int func, long data); DESCRIPTION This system call used to turn the calling process into the bdflush daemon, or tune it, or flush the "old buffers". It then progressively lost all of that functionality. See fs/buffer.c in the kernel version you're interested in to see what it actually does there. ERRORS ENOSYS (this system call is unimplemented) STANDARDS Linux. HISTORY This system call was introduced in Linux 1.1.3, became effectively obsolete in Linux 1.3.50, mostly useless in Linux 2.3.23, entirely useless in Linux 2.5.12, officially deprecated in Linux 2.5.52, and removed outright in Linux 5.15. Sometimes, if func was even, data actually represented a pointer. The header and prototype were removed in glibc 2.23. SEE ALSO sync(1), fsync(2), sync(2) Linux man-pages 6.13 2024-08-21 bdflush(2)