kern_context.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/proc.h>
   35 #include <sys/sysent.h>
   36 #include <sys/systm.h>
   37 #include <sys/sysproto.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/ucontext.h>
   40 
   41 /*
   42  * The first two fields of a ucontext_t are the signal mask and the machine
   43  * context.  The next field is uc_link; we want to avoid destroying the link
   44  * when copying out contexts.
   45  */
   46 #define UC_COPY_SIZE    offsetof(ucontext_t, uc_link)
   47 
   48 #ifndef _SYS_SYSPROTO_H_
   49 struct getcontext_args {
   50         struct __ucontext *ucp;
   51 }
   52 struct setcontext_args {
   53         const struct __ucontext_t *ucp;
   54 }
   55 struct swapcontext_args {
   56         struct __ucontext *oucp;
   57         const struct __ucontext_t *ucp;
   58 }
   59 #endif
   60 
   61 int
   62 getcontext(struct thread *td, struct getcontext_args *uap)
   63 {
   64         ucontext_t uc;
   65         int ret;
   66 
   67         if (uap->ucp == NULL)
   68                 ret = EINVAL;
   69         else {
   70                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
   71                 PROC_LOCK(td->td_proc);
   72                 uc.uc_sigmask = td->td_sigmask;
   73                 PROC_UNLOCK(td->td_proc);
   74                 bzero(uc.__spare__, sizeof(uc.__spare__));
   75                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   76         }
   77         return (ret);
   78 }
   79 
   80 int
   81 setcontext(struct thread *td, struct setcontext_args *uap)
   82 {
   83         ucontext_t uc;
   84         int ret;        
   85 
   86         if (uap->ucp == NULL)
   87                 ret = EINVAL;
   88         else {
   89                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   90                 if (ret == 0) {
   91                         ret = set_mcontext(td, &uc.uc_mcontext);
   92                         if (ret == 0) {
   93                                 SIG_CANTMASK(uc.uc_sigmask);
   94                                 PROC_LOCK(td->td_proc);
   95                                 td->td_sigmask = uc.uc_sigmask;
   96                                 PROC_UNLOCK(td->td_proc);
   97                         }
   98                 }
   99         }
  100         return (ret == 0 ? EJUSTRETURN : ret);
  101 }
  102 
  103 int
  104 swapcontext(struct thread *td, struct swapcontext_args *uap)
  105 {
  106         ucontext_t uc;
  107         int ret;        
  108 
  109         if (uap->oucp == NULL || uap->ucp == NULL)
  110                 ret = EINVAL;
  111         else {
  112                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
  113                 bzero(uc.__spare__, sizeof(uc.__spare__));
  114                 PROC_LOCK(td->td_proc);
  115                 uc.uc_sigmask = td->td_sigmask;
  116                 PROC_UNLOCK(td->td_proc);
  117                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  118                 if (ret == 0) {
  119                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  120                         if (ret == 0) {
  121                                 ret = set_mcontext(td, &uc.uc_mcontext);
  122                                 if (ret == 0) {
  123                                         SIG_CANTMASK(uc.uc_sigmask);
  124                                         PROC_LOCK(td->td_proc);
  125                                         td->td_sigmask = uc.uc_sigmask;
  126                                         PROC_UNLOCK(td->td_proc);
  127                                 }
  128                         }
  129                 }
  130         }
  131         return (ret == 0 ? EJUSTRETURN : ret);
  132 }

Cache object: ceb5a7a71d9443d0439429aed0954824

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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