kern_context.c

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    1 /*-
    2  * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
    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  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 /*
   28  * $FreeBSD: releng/5.0/sys/kern/kern_context.c 106977 2002-11-16 06:35:53Z deischen $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/sysent.h>
   37 #include <sys/systm.h>
   38 #include <sys/sysproto.h>
   39 #include <sys/signalvar.h>
   40 #include <sys/ucontext.h>
   41 
   42 /*
   43  * The first two fields of a ucontext_t are the signal mask and
   44  * the machine context.  The next field is uc_link; we want to
   45  * avoid destroying the link when copying out contexts.
   46  */
   47 #define UC_COPY_SIZE    (sizeof(sigset_t) + sizeof(mcontext_t))
   48 
   49 
   50 #ifndef _SYS_SYSPROTO_H_
   51 struct getcontext_args {
   52         struct __ucontext *ucp;
   53 }
   54 struct setcontext_args {
   55         const struct __ucontext_t *ucp;
   56 }
   57 struct swapcontext_args {
   58         struct __ucontext *oucp;
   59         const struct __ucontext_t *ucp;
   60 }
   61 #endif
   62 
   63 /*
   64  * MPSAFE
   65  */
   66 int
   67 getcontext(struct thread *td, struct getcontext_args *uap)
   68 {
   69         ucontext_t uc;
   70         int ret;        
   71 
   72         if (uap->ucp == NULL)
   73                 ret = EINVAL;
   74         else {
   75                 get_mcontext(td, &uc.uc_mcontext);
   76                 uc.uc_sigmask = td->td_proc->p_sigmask;
   77                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   78         }
   79         return (ret);
   80 }
   81 
   82 /*
   83  * MPSAFE
   84  */
   85 int
   86 setcontext(struct thread *td, struct setcontext_args *uap)
   87 {
   88         ucontext_t uc;
   89         int ret;        
   90 
   91         if (uap->ucp == NULL)
   92                 ret = EINVAL;
   93         else {
   94                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   95                 if (ret == 0) {
   96                         ret = set_mcontext(td, &uc.uc_mcontext);
   97                         if (ret == 0) {
   98                                 SIG_CANTMASK(uc.uc_sigmask);
   99                                 PROC_LOCK(td->td_proc);
  100                                 td->td_proc->p_sigmask = uc.uc_sigmask;
  101                                 PROC_UNLOCK(td->td_proc);
  102                         }
  103                 }
  104         }
  105         return (ret);
  106 }
  107 
  108 int
  109 swapcontext(struct thread *td, struct swapcontext_args *uap)
  110 {
  111         ucontext_t uc;
  112         int ret;        
  113 
  114         if (uap->oucp == NULL || uap->ucp == NULL)
  115                 ret = EINVAL;
  116         else {
  117                 get_mcontext(td, &uc.uc_mcontext);
  118                 uc.uc_sigmask = td->td_proc->p_sigmask;
  119                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  120                 if (ret == 0) {
  121                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  122                         if (ret == 0) {
  123                                 ret = set_mcontext(td, &uc.uc_mcontext);
  124                                 if (ret == 0) {
  125                                         SIG_CANTMASK(uc.uc_sigmask);
  126                                         PROC_LOCK(td->td_proc);
  127                                         td->td_proc->p_sigmask = uc.uc_sigmask;
  128                                         PROC_UNLOCK(td->td_proc);
  129                                 }
  130                         }
  131                 }
  132         }
  133         return (ret);
  134 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_context.c

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sys/kern/kern_context.c