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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1999 Marcel Moolenaar
      * 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, this list of conditions and the following disclaimer 
     *    in this position and unchanged.
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
     *
     * $FreeBSD: releng/12.0/sys/sys/ucontext.h 326256 2017-11-27 15:01:59Z pfg $
     */
    
    #ifndef _SYS_UCONTEXT_H_
    #define _SYS_UCONTEXT_H_
    
    #include <sys/signal.h>
    #include <machine/ucontext.h>
    #include <sys/_ucontext.h>
    
    #define UCF_SWAPPED     0x00000001      /* Used by swapcontext(3). */
    
    #if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
    #if defined(__i386__)
    struct ucontext4 {
            sigset_t        uc_sigmask;
            struct mcontext4 uc_mcontext;
            struct ucontext4 *uc_link;
            stack_t         uc_stack;
            int             __spare__[8];
    };
    #else   /* __i386__ */
    #define ucontext4 ucontext
    #endif  /* __i386__ */
    #endif  /* _KERNEL */
    
    #ifndef _KERNEL
    
    __BEGIN_DECLS
    
    int     getcontext(ucontext_t *) __returns_twice;
    ucontext_t *getcontextx(void);
    int     setcontext(const ucontext_t *);
    void    makecontext(ucontext_t *, void (*)(void), int, ...);
    int     signalcontext(ucontext_t *, int, __sighandler_t *);
    int     swapcontext(ucontext_t *, const ucontext_t *);
    
    #if __BSD_VISIBLE
    int __getcontextx_size(void);
    int __fillcontextx(char *ctx) __returns_twice;
    int __fillcontextx2(char *ctx);
    #endif
    
    __END_DECLS
    
    #else /* _KERNEL */
    
    struct thread;
    
    /*
     * Flags for get_mcontext().  The low order 4 bits (i.e a mask of 0x0f) are
     * reserved for use by machine independent code.  All other bits are for use
     * by machine dependent code.
     */
    #define GET_MC_CLEAR_RET        1
    
    /* Machine-dependent functions: */
    int     get_mcontext(struct thread *, mcontext_t *, int);
    int     set_mcontext(struct thread *, mcontext_t *);
    
    #endif /* !_KERNEL */
    
    #endif /* !_SYS_UCONTEXT_H_ */

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