FreeBSD/Linux Kernel Cross Reference
sys/emulation/43bsd/43bsd_signal.c

     /*
      * 43BSD_SIGNAL.C       - 4.3BSD compatibility signal syscalls
      *
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     * $DragonFly: src/sys/emulation/43bsd/43bsd_signal.c,v 1.5 2007/03/12 21:07:42 corecode Exp $
     *      from: DragonFly kern/kern_sig.c,v 1.22
     *
     * These syscalls used to live in kern/kern_sig.c.  They are modified
     * to use the new split syscalls.
     */
    
    #include "opt_compat.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/kern_syscall.h>
    #include <sys/proc.h>
    #include <sys/signal.h>
    #include <sys/signalvar.h>
    
    #include <sys/thread2.h>
    
    #define ONSIG   32              /* NSIG for osig* syscalls.  XXX. */
    
    #define SIG2OSIG(sig, osig)     osig = (sig).__bits[0]
    #define OSIG2SIG(osig, sig)     SIGEMPTYSET(sig); (sig).__bits[0] = osig
    
    #define SIGSETLO(set1, set2)    ((set1).__bits[0] = (set2).__bits[0])
    
    /*
     * These syscalls are unncessary because it is next to impossible to
     * find 4.3BSD binaries built for i386.  The current libc has routines
     * which fake the 4.3BSD family of signal syscalls, so anything built
     * from source won't be using these.
     *
     * This file is provided for educational purposes only.  The osigvec()
     * syscall is probably broken because the current signal code uses
     * a different signal trampoline.
     *
     * MPALMOSTSAFE
     */
    int
    sys_osigvec(struct osigvec_args *uap)
    {
            struct sigvec vec;
            struct sigaction nsa, osa;
            struct sigaction *nsap, *osap;
            int error;
    
            if (uap->signum <= 0 || uap->signum >= ONSIG)
                    return (EINVAL);
            nsap = (uap->nsv != NULL) ? &nsa : NULL;
            osap = (uap->osv != NULL) ? &osa : NULL;
            if (nsap) {
                    error = copyin(uap->nsv, &vec, sizeof(vec));
                    if (error)
                            return (error);
                    nsap->sa_handler = vec.sv_handler;
                    OSIG2SIG(vec.sv_mask, nsap->sa_mask);
                    nsap->sa_flags = vec.sv_flags;
                    nsap->sa_flags ^= SA_RESTART;   /* opposite of SV_INTERRUPT */
            }
    
            error = kern_sigaction(uap->signum, nsap, osap);
    
           if (osap && !error) {
                   vec.sv_handler = osap->sa_handler;
                   SIG2OSIG(osap->sa_mask, vec.sv_mask);
                   vec.sv_flags = osap->sa_flags;
                   vec.sv_flags &= ~SA_NOCLDWAIT;
                   vec.sv_flags ^= SA_RESTART;
                   error = copyout(&vec, uap->osv, sizeof(vec));
           }
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   sys_osigblock(struct osigblock_args *uap)
   {
           struct lwp *lp = curthread->td_lwp;
           sigset_t set;
   
           OSIG2SIG(uap->mask, set);
           SIG_CANTMASK(set);
           crit_enter();
           SIG2OSIG(lp->lwp_sigmask, uap->sysmsg_iresult);
           SIGSETOR(lp->lwp_sigmask, set);
           crit_exit();
           return (0);
   }
   
   /*
    * MPSAFE
    */
   int
   sys_osigsetmask(struct osigsetmask_args *uap)
   {
           struct lwp *lp = curthread->td_lwp;
           sigset_t set;
   
           OSIG2SIG(uap->mask, set);
           SIG_CANTMASK(set);
           crit_enter();
           SIG2OSIG(lp->lwp_sigmask, uap->sysmsg_iresult);
           SIGSETLO(lp->lwp_sigmask, set);
           crit_exit();
           return (0);
   }
   
   /*
    * MPSAFE
    */
   int
   sys_osigstack(struct osigstack_args *uap)
   {
           struct lwp *lp = curthread->td_lwp;
           struct sigstack ss;
           int error = 0;
   
           ss.ss_sp = lp->lwp_sigstk.ss_sp;
           ss.ss_onstack = lp->lwp_sigstk.ss_flags & SS_ONSTACK;
           if (uap->oss && (error = copyout(&ss, uap->oss,
                                            sizeof(struct sigstack)))) {
                   return (error);
           }
           if (uap->nss && (error = copyin(uap->nss, &ss, sizeof(ss))) == 0) {
                   lp->lwp_sigstk.ss_sp = ss.ss_sp;
                   lp->lwp_sigstk.ss_size = 0;
                   lp->lwp_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK;
                   lp->lwp_flags |= LWP_ALTSTACK;
           }
           return (error);
   }
   
   int
   sys_okillpg(struct okillpg_args *uap)
   {
           int error;
   
           error = kern_kill(uap->signum, -uap->pgid, -1);
   
           return (error);
   }

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