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/compat/linux/common/linux_sigaction.c

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    1 /*      $NetBSD: linux_sigaction.c,v 1.25 2003/01/18 21:21:32 thorpej Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Frank van der Linden and Eric Haszlakiewicz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.25 2003/01/18 21:21:32 thorpej Exp $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/proc.h>
   49 #include <sys/filedesc.h>
   50 #include <sys/mount.h>
   51 #include <sys/kernel.h>
   52 #include <sys/signal.h>
   53 #include <sys/signalvar.h>
   54 
   55 #include <sys/sa.h>
   56 #include <sys/syscallargs.h>
   57 
   58 #include <compat/linux/common/linux_types.h>
   59 #include <compat/linux/common/linux_signal.h>
   60 #include <compat/linux/common/linux_util.h>
   61 
   62 #include <compat/linux/linux_syscallargs.h>
   63 
   64 /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
   65 /* Not used on: sparc, sparc64 */
   66 
   67 /*
   68  * The Linux sigaction() system call. Do the usual conversions,
   69  * and just call sigaction().
   70  */
   71 int
   72 linux_sys_sigaction(l, v, retval)
   73         struct lwp *l;
   74         void *v;
   75         register_t *retval;
   76 {
   77         struct linux_sys_sigaction_args /* {
   78                 syscallarg(int) signum;
   79                 syscallarg(const struct linux_old_sigaction *) nsa;
   80                 syscallarg(struct linux_old_sigaction *) osa;
   81         } */ *uap = v;
   82         struct proc *p = l->l_proc;
   83         struct linux_old_sigaction nlsa, olsa;
   84         struct sigaction nbsa, obsa;
   85         int error, sig;
   86 
   87         /* XXX XAX handle switch to RT signal handler */
   88         /* XXX XAX and update emuldata->ps_siginfo. */
   89 
   90         if (SCARG(uap, nsa)) {
   91                 error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
   92                 if (error)
   93                         return (error);
   94                 linux_old_to_native_sigaction(&nbsa, &nlsa);
   95         }
   96         sig = SCARG(uap, signum);
   97         if (sig < 0 || sig >= LINUX__NSIG)
   98                 return (EINVAL);
   99         if (sig > 0 && !linux_to_native_signo[sig]) {
  100                 /* Pretend that we did something useful for unknown signals. */
  101                 obsa.sa_handler = SIG_IGN;
  102                 sigemptyset(&obsa.sa_mask);
  103                 obsa.sa_flags = 0;
  104         } else {
  105                 error = sigaction1(p, linux_to_native_signo[sig],
  106                     SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
  107                     NULL, 0);
  108                 if (error)
  109                         return (error);
  110         }
  111         if (SCARG(uap, osa)) {
  112                 native_to_linux_old_sigaction(&olsa, &obsa);
  113                 error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
  114                 if (error)
  115                         return (error);
  116         }
  117         return (0);
  118 }

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