Originální popis anglicky:
bdflush - start, flush, or tune buffer-dirty-flush daemon
Návod, kniha: Linux Programmer's Manual
int bdflush(int func, long *address);
int bdflush(int func, long data);
bdflush starts, flushes, or tunes the buffer-dirty-flush daemon. Only a
privileged process (one with the
CAP_SYS_ADMIN capability) may call
bdflush.
If
func is negative or 0, and no daemon has been started, then
bdflush enters the daemon code and never returns.
If
func is 1, some dirty buffers are written to disk.
If
func is 2 or more and is even (low bit is 0), then
address is
the address of a long word, and the tuning parameter numbered
(
func-2)/2 is returned to the caller in that address.
If
func is 3 or more and is odd (low bit is 1), then
data is a
long word, and the kernel sets tuning parameter numbered (
func-3)/2 to
that value.
The set of parameters, their values, and their legal ranges are defined in the
kernel source file
fs/buffer.c.
If
func is negative or 0 and the daemon successfully starts,
bdflush never returns. Otherwise, the return value is 0 on success and
-1 on failure, with
errno set to indicate the error.
- EBUSY
- An attempt was made to enter the daemon code after another
process has already entered.
- EFAULT
- address points outside your accessible address
space.
- EINVAL
- An attempt was made to read or write an invalid parameter
number, or to write an invalid value to a parameter.
- EPERM
- Caller does not have the CAP_SYS_ADMIN
capability.
bdflush is Linux specific and should not be used in programs intended to
be portable.
fsync(2),
sync(2),
sync(8),
update(8)
