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

     /*      $NetBSD: ucontext.h,v 1.11 2008/10/15 06:51:21 wrstuden Exp $   */
     
     /*-
      * Copyright (c) 1999, 2003 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Klaus Klein, and by Jason R. Thorpe.
      *
     * 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, this list of conditions and the following disclaimer.
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``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 FOUNDATION OR CONTRIBUTORS
     * 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.
     */
    
    #ifndef _SYS_UCONTEXT_H_
    #define _SYS_UCONTEXT_H_
    
    #include <sys/sigtypes.h>
    #include <machine/mcontext.h>
    
    typedef struct __ucontext       ucontext_t;
    
    struct __ucontext {
            unsigned int    uc_flags;       /* properties */
            ucontext_t *    uc_link;        /* context to resume */
            sigset_t        uc_sigmask;     /* signals blocked in this context */
            stack_t         uc_stack;       /* the stack used by this context */
            mcontext_t      uc_mcontext;    /* machine state */
    #if defined(_UC_MACHINE_PAD)
            long            __uc_pad[_UC_MACHINE_PAD];
    #endif
    };
    
    #ifndef _UC_UCONTEXT_ALIGN
    #define _UC_UCONTEXT_ALIGN (~0)
    #endif
    
    /* uc_flags */
    #define _UC_SIGMASK     0x01            /* valid uc_sigmask */
    #define _UC_STACK       0x02            /* valid uc_stack */
    #define _UC_CPU         0x04            /* valid GPR context in uc_mcontext */
    #define _UC_FPU         0x08            /* valid FPU context in uc_mcontext */
    
    #ifdef _KERNEL
    struct lwp;
    
    void    getucontext(struct lwp *, ucontext_t *);
    void    getucontext_sa(struct lwp *, ucontext_t *);
    int     setucontext(struct lwp *, const ucontext_t *);
    void    cpu_getmcontext(struct lwp *, mcontext_t *, unsigned int *);
    int     cpu_setmcontext(struct lwp *, const mcontext_t *, unsigned int);
    #endif /* _KERNEL */
    
    #endif /* !_SYS_UCONTEXT_H_ */

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