The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1999 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer 
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: src/sys/sys/ucontext.h,v 1.11 2003/11/09 20:31:04 marcel Exp $
   29  */
   30 
   31 #ifndef _SYS_UCONTEXT_H_
   32 #define _SYS_UCONTEXT_H_
   33 
   34 #include <sys/signal.h>
   35 #include <machine/ucontext.h>
   36 
   37 typedef struct __ucontext {
   38         /*
   39          * Keep the order of the first two fields. Also,
   40          * keep them the first two fields in the structure.
   41          * This way we can have a union with struct
   42          * sigcontext and ucontext_t. This allows us to
   43          * support them both at the same time.
   44          * note: the union is not defined, though.
   45          */
   46         sigset_t        uc_sigmask;
   47         mcontext_t      uc_mcontext;
   48 
   49         struct __ucontext *uc_link;
   50         stack_t         uc_stack;
   51         int             uc_flags;
   52 #define UCF_SWAPPED     0x00000001      /* Used by swapcontext(3). */
   53         int             __spare__[4];
   54 } ucontext_t;
   55 
   56 #if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
   57 #if defined(__i386__) || defined(__alpha__)
   58 struct ucontext4 {
   59         sigset_t        uc_sigmask;
   60         struct mcontext4 uc_mcontext;
   61         struct ucontext4 *uc_link;
   62         stack_t         uc_stack;
   63         int             __spare__[8];
   64 };
   65 #else   /* __i386__ || __alpha__ */
   66 #define ucontext4 ucontext
   67 #endif  /* __i386__ || __alpha__ */
   68 #endif  /* _KERNEL */
   69 
   70 #ifndef _KERNEL
   71 
   72 __BEGIN_DECLS
   73 
   74 int     getcontext(ucontext_t *);
   75 int     setcontext(const ucontext_t *);
   76 void    makecontext(ucontext_t *, void (*)(void), int, ...);
   77 int     signalcontext(ucontext_t *, int, __sighandler_t *);
   78 int     swapcontext(ucontext_t *, const ucontext_t *);
   79 
   80 __END_DECLS
   81 
   82 #else /* _KERNEL */
   83 
   84 struct thread;
   85 
   86 /*
   87  * Flags for get_mcontext().  The low order 4 bits (i.e a mask of 0x0f) are
   88  * reserved for use by machine independent code.  All other bits are for use
   89  * by machine dependent code.
   90  */
   91 #define GET_MC_CLEAR_RET        1
   92 
   93 /* Machine-dependent functions: */
   94 int     get_mcontext(struct thread *, mcontext_t *, int);
   95 int     set_mcontext(struct thread *, const mcontext_t *);
   96 
   97 #endif /* !_KERNEL */
   98 
   99 #endif /* !_SYS_UCONTEXT_H_ */

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