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RedHat 9 (Linux i386) - man page for bdflush (redhat section 2)

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  kernel
       source file fs/buffer.c.

RETURN VALUE
       If  func is negative or 0 and the daemon successfully starts, bdflush never returns.  Oth-
       erwise, 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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