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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1999 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer 
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD: stable/12/sys/sys/ucontext.h 326256 2017-11-27 15:01:59Z pfg $
   31  */
   32 
   33 #ifndef _SYS_UCONTEXT_H_
   34 #define _SYS_UCONTEXT_H_
   35 
   36 #include <sys/signal.h>
   37 #include <machine/ucontext.h>
   38 #include <sys/_ucontext.h>
   39 
   40 #define UCF_SWAPPED     0x00000001      /* Used by swapcontext(3). */
   41 
   42 #if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
   43 #if defined(__i386__)
   44 struct ucontext4 {
   45         sigset_t        uc_sigmask;
   46         struct mcontext4 uc_mcontext;
   47         struct ucontext4 *uc_link;
   48         stack_t         uc_stack;
   49         int             __spare__[8];
   50 };
   51 #else   /* __i386__ */
   52 #define ucontext4 ucontext
   53 #endif  /* __i386__ */
   54 #endif  /* _KERNEL */
   55 
   56 #ifndef _KERNEL
   57 
   58 __BEGIN_DECLS
   59 
   60 int     getcontext(ucontext_t *) __returns_twice;
   61 ucontext_t *getcontextx(void);
   62 int     setcontext(const ucontext_t *);
   63 void    makecontext(ucontext_t *, void (*)(void), int, ...);
   64 int     signalcontext(ucontext_t *, int, __sighandler_t *);
   65 int     swapcontext(ucontext_t *, const ucontext_t *);
   66 
   67 #if __BSD_VISIBLE
   68 int __getcontextx_size(void);
   69 int __fillcontextx(char *ctx) __returns_twice;
   70 int __fillcontextx2(char *ctx);
   71 #endif
   72 
   73 __END_DECLS
   74 
   75 #else /* _KERNEL */
   76 
   77 struct thread;
   78 
   79 /*
   80  * Flags for get_mcontext().  The low order 4 bits (i.e a mask of 0x0f) are
   81  * reserved for use by machine independent code.  All other bits are for use
   82  * by machine dependent code.
   83  */
   84 #define GET_MC_CLEAR_RET        1
   85 
   86 /* Machine-dependent functions: */
   87 int     get_mcontext(struct thread *, mcontext_t *, int);
   88 int     set_mcontext(struct thread *, mcontext_t *);
   89 
   90 #endif /* !_KERNEL */
   91 
   92 #endif /* !_SYS_UCONTEXT_H_ */

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