FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_signal.c

     /*-
      * Copyright (c) 1994-1995 Søren Schmidt
      * All rights reserved.
      *
      * 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 
     *    in this position and unchanged.
     * 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. The name of the author may not be used to endorse or promote products
     *    derived from this software withough specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     *
     * $FreeBSD: src/sys/i386/linux/linux_signal.c,v 1.6.4.2 1999/09/05 08:14:17 peter Exp $
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/proc.h>
    #include <sys/exec.h>
    #include <sys/signal.h>
    #include <sys/signalvar.h>
    
    #include <i386/linux/linux.h>
    #include <i386/linux/linux_proto.h>
    #include <i386/linux/linux_util.h>
    
    static sigset_t
    linux_to_bsd_sigset(linux_sigset_t mask) {
        int b, l;
        sigset_t new = 0;
    
        for (l = 1; l < LINUX_NSIG; l++) {
            if (mask & (1 << (l - 1))) {
                if ((b = linux_to_bsd_signal[l]))
                    new |= (1 << (b - 1));
            }
        }
        return new;
    }
    
    static linux_sigset_t
    bsd_to_linux_sigset(sigset_t mask) {
        int b, l;
        sigset_t new = 0;
    
        for (b = 1; b < NSIG; b++) {
            if (mask & (1 << (b - 1))) {
                if ((l = bsd_to_linux_signal[b]))
                    new |= (1 << (l - 1));
            }
        }
        return new;
    }
    
    static void
    linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
    {
        bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
        bsa->sa_handler = lsa->sa_handler;
        bsa->sa_flags = 0;
        if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
            bsa->sa_flags |= SA_NOCLDSTOP;
        if (lsa->sa_flags & LINUX_SA_ONSTACK)
            bsa->sa_flags |= SA_ONSTACK;
        if (lsa->sa_flags & LINUX_SA_RESTART)
            bsa->sa_flags |= SA_RESTART;
        if (lsa->sa_flags & LINUX_SA_ONESHOT)
            bsa->sa_flags |= SA_RESETHAND;
        if (lsa->sa_flags & LINUX_SA_NOMASK)
            bsa->sa_flags |= SA_NODEFER;
    }
    
    static void
    bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
    {
        lsa->sa_handler = bsa->sa_handler;
        lsa->sa_restorer = NULL;    /* unsupported */
        lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
        lsa->sa_flags = 0;
        if (bsa->sa_flags & SA_NOCLDSTOP)
            lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
        if (bsa->sa_flags & SA_ONSTACK)
            lsa->sa_flags |= LINUX_SA_ONSTACK;
       if (bsa->sa_flags & SA_RESTART)
           lsa->sa_flags |= LINUX_SA_RESTART;
       if (bsa->sa_flags & SA_RESETHAND)
           lsa->sa_flags |= LINUX_SA_ONESHOT;
       if (bsa->sa_flags & SA_NODEFER)
           lsa->sa_flags |= LINUX_SA_NOMASK;
   }
   
   int
   linux_sigaction(struct proc *p, struct linux_sigaction_args *args, int *retval)
   {
       linux_sigaction_t linux_sa;
       struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
       struct sigaction_args sa;
       int error;
       caddr_t sg = stackgap_init();
       
   #ifdef DEBUG
       printf("Linux-emul(%d): sigaction(%d, %08x, %08x)\n", p->p_pid, args->sig,
           args->nsa, args->osa);
   #endif
       if (args->sig <= 0 || args->sig >= LINUX_NSIG)
           return EINVAL;
       if (args->osa)
           osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
   
       if (args->nsa) {
           nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
           if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
               return error;
           linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
           if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
               return error;
       }
       sa.signum = linux_to_bsd_signal[args->sig];
       sa.nsa = nsa;
       sa.osa = osa;
       if ((error = sigaction(p, &sa, retval)))
           return error;
   
       if (args->osa) {
           if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
               return error;
           bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
           if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
               return error;
       }
       return 0;
   }
   
   int
   linux_signal(struct proc *p, struct linux_signal_args *args, int *retval)
   {
       caddr_t sg;
       struct sigaction_args sa_args;
       struct sigaction *osa, *nsa, tmpsa;
       int error;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): signal(%d, %08x)\n", p->p_pid,
               args->sig, args->handler);
   #endif
       if (args->sig <= 0 || args->sig >= LINUX_NSIG)
           return EINVAL;
       sg = stackgap_init();
       nsa = stackgap_alloc(&sg, sizeof *nsa);
       osa = stackgap_alloc(&sg, sizeof *osa);
   
       tmpsa.sa_handler = args->handler;
       tmpsa.sa_mask = (sigset_t) 0;
       tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
       if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
           return error;
   
       sa_args.signum = linux_to_bsd_signal[args->sig];
       sa_args.osa = osa;
       sa_args.nsa = nsa;
       if ((error = sigaction(p, &sa_args, retval)))
           return error;
   
       if ((error = copyin(osa, &tmpsa, sizeof *osa)))
           return error;
   
       *retval = (int)tmpsa.sa_handler;
   
       return 0;
   }
   
   
   int
   linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
                     int *retval)
   {
       int error, s;
       sigset_t mask;
       sigset_t omask;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
   #endif
   
       *retval = 0;
   
       if (args->omask != NULL) {
           omask = bsd_to_linux_sigset(p->p_sigmask);
           if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
               return error;
       }
       if (!(args->mask))
           return 0;
       if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
           return error;
   
       mask = linux_to_bsd_sigset(mask);
       s = splhigh();
       switch (args->how) {
       case LINUX_SIG_BLOCK:
           p->p_sigmask |= (mask & ~sigcantmask);
           break;
       case LINUX_SIG_UNBLOCK:
           p->p_sigmask &= ~mask;
           break;
       case LINUX_SIG_SETMASK:
           p->p_sigmask = (mask & ~sigcantmask);
           break;
       default:
           error = EINVAL;
           break;
       }
       splx(s);
       return error;
   }
   
   int
   linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args, int *retval)
   {
   #ifdef DEBUG
       printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
   #endif
       *retval = bsd_to_linux_sigset(p->p_sigmask);
       return 0;
   }
   
   int
   linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args,int *retval)
   {
       int s;
       sigset_t mask;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): sigsetmask(%08x)\n", p->p_pid, args->mask);
   #endif
       *retval = bsd_to_linux_sigset(p->p_sigmask);
   
       mask = linux_to_bsd_sigset(args->mask);
       s = splhigh();
       p->p_sigmask = mask & ~sigcantmask;
       splx(s);
       return 0;
   }
   
   int
   linux_sigpending(struct proc *p, struct linux_sigpending_args *args,int *retval)
   {
       linux_sigset_t linux_sig;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
   #endif
       linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
       return copyout(&linux_sig, args->mask, sizeof(linux_sig));
   }
   
   /*
    * Linux has two extra args, restart and oldmask.  We dont use these,
    * but it seems that "restart" is actually a context pointer that
    * enables the signal to happen with a different register set.
    */
   int
   linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args,int *retval)
   {
       struct sigsuspend_args tmp;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): sigsuspend(%08x)\n", p->p_pid, args->mask);
   #endif
       tmp.mask = linux_to_bsd_sigset(args->mask);
       return sigsuspend(p, &tmp , retval);
   }
   
   int
   linux_pause(struct proc *p, struct linux_pause_args *args,int *retval)
   {
       struct sigsuspend_args tmp;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): pause()\n", p->p_pid);
   #endif
       tmp.mask = p->p_sigmask;
       return sigsuspend(p, &tmp , retval);
   }
   
   int
   linux_kill(struct proc *p, struct linux_kill_args *args, int *retval)
   {
       struct kill_args /* {
           int pid;
           int signum;
       } */ tmp;
   
   #ifdef DEBUG
       printf("Linux-emul(%d): kill(%d, %d)\n", 
              p->p_pid, args->pid, args->signum);
   #endif
       if (args->signum <= 0 || args->signum >= LINUX_NSIG)
           return EINVAL;
       tmp.pid = args->pid;
       tmp.signum = linux_to_bsd_signal[args->signum];
       return kill(p, &tmp, retval);
   }

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