bdflush - phpMan

BDFLUSH(2)                 Linux Programmer’s Manual                BDFLUSH(2)



NAME
       bdflush - start, flush, or tune buffer-dirty-flush daemon

SYNOPSIS
       int bdflush(int func, long *address);
       int bdflush(int func, long data);

DESCRIPTION
       bdflush  starts,  flushes, or tunes the buffer-dirty-flush daemon.  Only the super-
       user 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 ker-
       nel source file fs/buffer.c.

RETURN VALUE
       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.

ERRORS
       EPERM  Caller is not super-user.

       EFAULT address points outside your accessible address space.

       EBUSY  An  attempt  was  made  to  enter  the daemon code after another process has
              already entered.

       EINVAL An attempt was made to read or write an  invalid  parameter  number,  or  to
              write an invalid value to a parameter.

CONFORMING TO
       bdflush  is  Linux  specific  and  should  not  be  used in programs intended to be
       portable.

SEE ALSO
       fsync(2), sync(2), update(8), sync(8)



Linux 1.2.4                       1995-04-15                        BDFLUSH(2)

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