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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
    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  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_context.c 338982 2018-09-27 18:39:54Z gordon $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/proc.h>
   37 #include <sys/syscallsubr.h>
   38 #include <sys/sysent.h>
   39 #include <sys/systm.h>
   40 #include <sys/sysproto.h>
   41 #include <sys/signalvar.h>
   42 #include <sys/ucontext.h>
   43 
   44 /*
   45  * The first two fields of a ucontext_t are the signal mask and the machine
   46  * context.  The next field is uc_link; we want to avoid destroying the link
   47  * when copying out contexts.
   48  */
   49 #define UC_COPY_SIZE    offsetof(ucontext_t, uc_link)
   50 
   51 #ifndef _SYS_SYSPROTO_H_
   52 struct getcontext_args {
   53         struct __ucontext *ucp;
   54 }
   55 struct setcontext_args {
   56         const struct __ucontext_t *ucp;
   57 }
   58 struct swapcontext_args {
   59         struct __ucontext *oucp;
   60         const struct __ucontext_t *ucp;
   61 }
   62 #endif
   63 
   64 int
   65 sys_getcontext(struct thread *td, struct getcontext_args *uap)
   66 {
   67         ucontext_t uc;
   68         int ret;
   69 
   70         if (uap->ucp == NULL)
   71                 ret = EINVAL;
   72         else {
   73                 bzero(&uc, sizeof(ucontext_t));
   74                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
   75                 PROC_LOCK(td->td_proc);
   76                 uc.uc_sigmask = td->td_sigmask;
   77                 PROC_UNLOCK(td->td_proc);
   78                 bzero(uc.__spare__, sizeof(uc.__spare__));
   79                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   80         }
   81         return (ret);
   82 }
   83 
   84 int
   85 sys_setcontext(struct thread *td, struct setcontext_args *uap)
   86 {
   87         ucontext_t uc;
   88         int ret;        
   89 
   90         if (uap->ucp == NULL)
   91                 ret = EINVAL;
   92         else {
   93                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   94                 if (ret == 0) {
   95                         ret = set_mcontext(td, &uc.uc_mcontext);
   96                         if (ret == 0) {
   97                                 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
   98                                     NULL, 0);
   99                         }
  100                 }
  101         }
  102         return (ret == 0 ? EJUSTRETURN : ret);
  103 }
  104 
  105 int
  106 sys_swapcontext(struct thread *td, struct swapcontext_args *uap)
  107 {
  108         ucontext_t uc;
  109         int ret;        
  110 
  111         if (uap->oucp == NULL || uap->ucp == NULL)
  112                 ret = EINVAL;
  113         else {
  114                 bzero(&uc, sizeof(ucontext_t));
  115                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
  116                 bzero(uc.__spare__, sizeof(uc.__spare__));
  117                 PROC_LOCK(td->td_proc);
  118                 uc.uc_sigmask = td->td_sigmask;
  119                 PROC_UNLOCK(td->td_proc);
  120                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  121                 if (ret == 0) {
  122                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  123                         if (ret == 0) {
  124                                 ret = set_mcontext(td, &uc.uc_mcontext);
  125                                 if (ret == 0) {
  126                                         kern_sigprocmask(td, SIG_SETMASK,
  127                                             &uc.uc_sigmask, NULL, 0);
  128                                 }
  129                         }
  130                 }
  131         }
  132         return (ret == 0 ? EJUSTRETURN : ret);
  133 }

Cache object: 64daa46de1bc01833b64f54d9a38ead4

[ 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