FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_sigaction.c

     /*      $NetBSD: linux_sigaction.c,v 1.34 2008/10/17 20:21:34 njoly Exp $       */
     
     /*-
      * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Frank van der Linden and Eric Haszlakiewicz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.34 2008/10/17 20:21:34 njoly Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/filedesc.h>
    #include <sys/mount.h>
    #include <sys/kernel.h>
    #include <sys/signal.h>
    #include <sys/signalvar.h>
    
    #include <sys/syscallargs.h>
    
    #include <compat/linux/common/linux_types.h>
    #include <compat/linux/common/linux_signal.h>
    #include <compat/linux/common/linux_util.h>
    #include <compat/linux/common/linux_ipc.h>
    #include <compat/linux/common/linux_sem.h>
    
    #include <compat/linux/linux_syscallargs.h>
    
    /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
    /* Not used on: sparc, sparc64, amd64 */
    
    /*
     * The Linux sigaction() system call. Do the usual conversions,
     * and just call sigaction().
     */
    int
    linux_sys_sigaction(struct lwp *l, const struct linux_sys_sigaction_args *uap, register_t *retval)
    {
            /* {
                    syscallarg(int) signum;
                    syscallarg(const struct linux_old_sigaction *) nsa;
                    syscallarg(struct linux_old_sigaction *) osa;
            } */
            struct linux_old_sigaction nlsa, olsa;
            struct sigaction nbsa, obsa;
            int error, sig;
    
            /* XXX XAX handle switch to RT signal handler */
            /* XXX XAX and update emuldata->ps_siginfo. */
    
            if (SCARG(uap, nsa)) {
                    error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
                    if (error)
                            return (error);
                    linux_old_to_native_sigaction(&nbsa, &nlsa);
            }
            sig = SCARG(uap, signum);
            if (sig < 0 || sig >= LINUX__NSIG)
                    return (EINVAL);
            if (sig > 0 && !linux_to_native_signo[sig]) {
                    /* Pretend that we did something useful for unknown signals. */
                    obsa.sa_handler = SIG_IGN;
                    sigemptyset(&obsa.sa_mask);
                    obsa.sa_flags = 0;
            } else {
                    error = sigaction1(l, linux_to_native_signo[sig],
                        SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
                        NULL, 0);
                    if (error)
                            return (error);
           }
           if (SCARG(uap, osa)) {
                   native_to_linux_old_sigaction(&olsa, &obsa);
                   error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
                   if (error)
                           return (error);
           }
           return (0);
   }

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