FreeBSD/Linux Kernel Cross Reference
sys/sys/random.h

     /*
      * random.h -- A strong random number generator
      *
      * $FreeBSD: src/sys/sys/random.h,v 1.19.2.2 2002/09/17 17:11:54 sam Exp $
      *
      * Version 0.95, last modified 18-Oct-95
      * 
      * Copyright Theodore Ts'o, 1994, 1995.  All rights reserved.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, and the entire permission notice in its entirety,
     *    including the disclaimer of warranties.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote
     *    products derived from this software without specific prior
     *    written permission.
     * 
     * ALTERNATIVELY, this product may be distributed under the terms of
     * the GNU Public License, in which case the provisions of the GPL are
     * required INSTEAD OF the above restrictions.  (This clause is
     * necessary due to a potential bad interaction between the GPL and
     * the restrictions contained in a BSD-style copyright.)
     * 
     * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     * OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     */
    
    /*
     * Many kernel routines will have a use for good random numbers,
     * for example, for truely random TCP sequence numbers, which prevent
     * certain forms of TCP spoofing attacks.
     * 
     */
    
    #ifndef _SYS_RANDOM_H_
    #define _SYS_RANDOM_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #ifndef _SYS_INTERRUPT_H_
    #include <sys/interrupt.h>
    #endif
    #ifndef _SYS_IOCCOM_H_
    #include <sys/ioccom.h>
    #endif
    
    #define MEM_SETIRQ      _IOW('r', 1, u_int16_t) /* set interrupt */
    #define MEM_CLEARIRQ    _IOW('r', 2, u_int16_t) /* clear interrupt */
    #define MEM_RETURNIRQ   _IOR('r', 3, u_int16_t) /* obsolete */
    #define MEM_FINDIRQ     _IOWR('r', 4, u_int16_t) /* next interrupt */
    
    #ifdef _KERNEL
    
    /* Type of the cookie passed to add_interrupt_randomness. */
    
    struct random_softc {
            int             sc_intr;
            int             sc_enabled;
    };
    
    /* Exported functions */
    
    void rand_initialize(void);
    void add_keyboard_randomness(u_char scancode);
    void add_interrupt_randomness(int intr);
    #ifdef notused
    void add_blkdev_randomness(int major);
    #endif
    void add_true_randomness(int);
    int add_buffer_randomness(const char *, int);
    
    #ifdef notused
    void get_random_bytes(void *buf, u_int nbytes);
    #endif
    u_int read_random(void *buf, u_int size);
    u_int read_random_unlimited(void *buf, u_int size);
    #ifdef notused
    u_int write_random(const char *buf, u_int nbytes);
    #endif
    struct thread;
    struct knote;
    int random_filter_read(struct knote *kn, long hint);
    
   #endif /* _KERNEL */
   
   #endif /* !_SYS_RANDOM_H_ */

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