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/i386/ibcs2/ibcs2_signal.c

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    1 /*
    2  * Copyright (c) 1995 Scott Bartram
    3  * Copyright (c) 1995 Steven Wallace
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/3/sys/i386/ibcs2/ibcs2_signal.c 50582 1999-08-29 16:07:53Z peter $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/signalvar.h>
   34 #include <sys/sysproto.h>
   35 
   36 #include <i386/ibcs2/ibcs2_types.h>
   37 #include <i386/ibcs2/ibcs2_signal.h>
   38 #include <i386/ibcs2/ibcs2_proto.h>
   39 #include <i386/ibcs2/ibcs2_xenix.h>
   40 #include <i386/ibcs2/ibcs2_util.h>
   41 
   42 #define sigemptyset(s)          bzero((s), sizeof(*(s)))
   43 #define sigismember(s, n)       (*(s) & sigmask(n))
   44 #define sigaddset(s, n)         (*(s) |= sigmask(n))
   45 
   46 #define ibcs2_sigmask(n)        (1 << ((n) - 1))
   47 #define ibcs2_sigemptyset(s)    bzero((s), sizeof(*(s)))
   48 #define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
   49 #define ibcs2_sigaddset(s, n)   (*(s) |= ibcs2_sigmask(n))
   50 
   51 static void ibcs2_to_bsd_sigset    __P((const ibcs2_sigset_t *, sigset_t *));
   52 static void bsd_to_ibcs2_sigset    __P((const sigset_t *, ibcs2_sigset_t *));
   53 static void ibcs2_to_bsd_sigaction __P((struct ibcs2_sigaction *,
   54                                         struct sigaction *));
   55 static void bsd_to_ibcs2_sigaction __P((struct sigaction *,
   56                                         struct ibcs2_sigaction *));
   57 
   58 int bsd_to_ibcs2_sig[] = {
   59         0,                      /* 0 */
   60         IBCS2_SIGHUP,           /* 1 */
   61         IBCS2_SIGINT,           /* 2 */
   62         IBCS2_SIGQUIT,          /* 3 */
   63         IBCS2_SIGILL,           /* 4 */
   64         IBCS2_SIGTRAP,          /* 5 */
   65         IBCS2_SIGABRT,          /* 6 */
   66         IBCS2_SIGEMT,           /* 7 */
   67         IBCS2_SIGFPE,           /* 8 */
   68         IBCS2_SIGKILL,          /* 9 */
   69         IBCS2_SIGBUS,           /* 10 */
   70         IBCS2_SIGSEGV,          /* 11 */
   71         IBCS2_SIGSYS,           /* 12 */
   72         IBCS2_SIGPIPE,          /* 13 */
   73         IBCS2_SIGALRM,          /* 14 */
   74         IBCS2_SIGTERM,          /* 15 */
   75         0,                      /* 16 - SIGURG */
   76         IBCS2_SIGSTOP,          /* 17 */
   77         IBCS2_SIGTSTP,          /* 18 */
   78         IBCS2_SIGCONT,          /* 19 */
   79         IBCS2_SIGCLD,           /* 20 */
   80         IBCS2_SIGTTIN,          /* 21 */
   81         IBCS2_SIGTTOU,          /* 22 */
   82         IBCS2_SIGPOLL,          /* 23 */
   83         0,                      /* 24 - SIGXCPU */
   84         0,                      /* 25 - SIGXFSZ */
   85         IBCS2_SIGVTALRM,        /* 26 */
   86         IBCS2_SIGPROF,          /* 27 */
   87         IBCS2_SIGWINCH,         /* 28 */
   88         0,                      /* 29 */
   89         IBCS2_SIGUSR1,          /* 30 */
   90         IBCS2_SIGUSR2,          /* 31 */
   91 };
   92 
   93 static int ibcs2_to_bsd_sig[] = {
   94         0,                      /* 0 */
   95         SIGHUP,                 /* 1 */
   96         SIGINT,                 /* 2 */
   97         SIGQUIT,                /* 3 */
   98         SIGILL,                 /* 4 */
   99         SIGTRAP,                /* 5 */
  100         SIGABRT,                /* 6 */
  101         SIGEMT,                 /* 7 */
  102         SIGFPE,                 /* 8 */
  103         SIGKILL,                /* 9 */
  104         SIGBUS,                 /* 10 */
  105         SIGSEGV,                /* 11 */
  106         SIGSYS,                 /* 12 */
  107         SIGPIPE,                /* 13 */
  108         SIGALRM,                /* 14 */
  109         SIGTERM,                /* 15 */
  110         SIGUSR1,                /* 16 */
  111         SIGUSR2,                /* 17 */
  112         SIGCHLD,                /* 18 */
  113         0,                      /* 19 - SIGPWR */
  114         SIGWINCH,               /* 20 */
  115         0,                      /* 21 */
  116         SIGIO,                  /* 22 */
  117         SIGSTOP,                /* 23 */
  118         SIGTSTP,                /* 24 */
  119         SIGCONT,                /* 25 */
  120         SIGTTIN,                /* 26 */
  121         SIGTTOU,                /* 27 */
  122         SIGVTALRM,              /* 28 */
  123         SIGPROF,                /* 29 */
  124         0,                      /* 30 */
  125         0,                      /* 31 */
  126 };
  127 
  128 void
  129 ibcs2_to_bsd_sigset(iss, bss)
  130         const ibcs2_sigset_t *iss;
  131         sigset_t *bss;
  132 {
  133         int i, newsig;
  134 
  135         sigemptyset(bss);
  136         for (i = 1; i < IBCS2_NSIG; i++) {
  137                 if (ibcs2_sigismember(iss, i)) {
  138                         newsig = ibcs2_to_bsd_sig[i];
  139                         if (newsig)
  140                                 sigaddset(bss, newsig);
  141                 }
  142         }
  143 }
  144 
  145 static void
  146 bsd_to_ibcs2_sigset(bss, iss)
  147         const sigset_t *bss;
  148         ibcs2_sigset_t *iss;
  149 {
  150         int i, newsig;
  151 
  152         ibcs2_sigemptyset(iss);
  153         for (i = 1; i < NSIG; i++) {
  154                 if (sigismember(bss, i)) {
  155                         newsig = bsd_to_ibcs2_sig[i];
  156                         if (newsig)
  157                                 ibcs2_sigaddset(iss, newsig);
  158                 }
  159         }
  160 }
  161 
  162 static void
  163 ibcs2_to_bsd_sigaction(isa, bsa)
  164         struct ibcs2_sigaction *isa;
  165         struct sigaction *bsa;
  166 {
  167 
  168         bsa->sa_handler = isa->sa_handler;
  169         ibcs2_to_bsd_sigset(&isa->sa_mask, &bsa->sa_mask);
  170         bsa->sa_flags = 0;      /* ??? SA_NODEFER */
  171         if ((isa->sa_flags & IBCS2_SA_NOCLDSTOP) != 0)
  172                 bsa->sa_flags |= SA_NOCLDSTOP;
  173 }
  174 
  175 static void
  176 bsd_to_ibcs2_sigaction(bsa, isa)
  177         struct sigaction *bsa;
  178         struct ibcs2_sigaction *isa;
  179 {
  180 
  181         isa->sa_handler = bsa->sa_handler;
  182         bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->sa_mask);
  183         isa->sa_flags = 0;
  184         if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
  185                 isa->sa_flags |= IBCS2_SA_NOCLDSTOP;
  186 }
  187 
  188 int
  189 ibcs2_sigaction(p, uap)
  190         register struct proc *p;
  191         struct ibcs2_sigaction_args *uap;
  192 {
  193         struct ibcs2_sigaction *nisa, *oisa, tmpisa;
  194         struct sigaction *nbsa, *obsa, tmpbsa;
  195         struct sigaction_args sa;
  196         caddr_t sg;
  197         int error;
  198 
  199         sg = stackgap_init();
  200         nisa = SCARG(uap, act);
  201         oisa = SCARG(uap, oact);
  202 
  203         if (oisa != NULL)
  204                 obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  205         else
  206                 obsa = NULL;
  207 
  208         if (nisa != NULL) {
  209                 nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  210                 if ((error = copyin(nisa, &tmpisa, sizeof(tmpisa))) != 0)
  211                         return error;
  212                 ibcs2_to_bsd_sigaction(&tmpisa, &tmpbsa);
  213                 if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
  214                         return error;
  215         } else
  216                 nbsa = NULL;
  217 
  218         SCARG(&sa, signum) = ibcs2_to_bsd_sig[SCARG(uap, sig)];
  219         SCARG(&sa, nsa) = nbsa;
  220         SCARG(&sa, osa) = obsa;
  221 
  222         if ((error = sigaction(p, &sa)) != 0)
  223                 return error;
  224 
  225         if (oisa != NULL) {
  226                 if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
  227                         return error;
  228                 bsd_to_ibcs2_sigaction(&tmpbsa, &tmpisa);
  229                 if ((error = copyout(&tmpisa, oisa, sizeof(tmpisa))) != 0)
  230                         return error;
  231         }
  232 
  233         return 0;
  234 }
  235 
  236 int
  237 ibcs2_sigsys(p, uap)
  238         register struct proc *p;
  239         struct ibcs2_sigsys_args *uap;
  240 {
  241         struct sigaction sa;
  242         int signum = ibcs2_to_bsd_sig[IBCS2_SIGNO(SCARG(uap, sig))];
  243         int error;
  244         caddr_t sg = stackgap_init();
  245 
  246         if (signum <= 0 || signum >= IBCS2_NSIG) {
  247                 if (IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGNAL_MASK ||
  248                     IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
  249                         p->p_retval[0] = (int)IBCS2_SIG_ERR;
  250                 return EINVAL;
  251         }
  252         
  253         switch (IBCS2_SIGCALL(SCARG(uap, sig))) {
  254         case IBCS2_SIGSET_MASK:
  255                 /*
  256                  * Check for SIG_HOLD action.
  257                  * Otherwise, perform signal() except with different sa_flags.
  258                  */
  259                 if (SCARG(uap, fp) != IBCS2_SIG_HOLD) {
  260                         /* add sig to mask before exececuting signal handler */
  261                         sa.sa_flags = 0;
  262                         goto ibcs2_sigset;
  263                 }
  264                 /* else fallthrough to sighold */
  265 
  266         case IBCS2_SIGHOLD_MASK:
  267                 {
  268                         struct sigprocmask_args sa;
  269 
  270                         SCARG(&sa, how) = SIG_BLOCK;
  271                         SCARG(&sa, mask) = sigmask(signum);
  272                         return sigprocmask(p, &sa);
  273                 }
  274                 
  275         case IBCS2_SIGNAL_MASK:
  276                 {
  277                         struct sigaction_args sa_args;
  278                         struct sigaction *nbsa, *obsa;
  279 
  280                         /* do not automatically block signal */
  281                         sa.sa_flags = SA_NODEFER;
  282 #ifdef SA_RESETHAND
  283                         if((signum != IBCS2_SIGILL) &&
  284                            (signum != IBCS2_SIGTRAP) &&
  285                            (signum != IBCS2_SIGPWR))
  286                                 /* set to SIG_DFL before executing handler */
  287                                 sa.sa_flags |= SA_RESETHAND;
  288 #endif
  289                 ibcs2_sigset:
  290                         nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  291                         obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  292                         SCARG(&sa_args, signum) = signum;
  293                         SCARG(&sa_args, nsa) = nbsa;
  294                         SCARG(&sa_args, osa) = obsa;
  295 
  296                         sa.sa_handler = SCARG(uap, fp);
  297                         sigemptyset(&sa.sa_mask);
  298 #if 0
  299                         if (signum != SIGALRM)
  300                                 sa.sa_flags |= SA_RESTART;
  301 #endif
  302                         p->p_retval[0] = (int)IBCS2_SIG_ERR; /* init error return */
  303 
  304                         /* perform native sigaction() */
  305                         if ((error = copyout(&sa, nbsa, sizeof(sa))) != 0)
  306                                 return error;
  307                         if ((error = sigaction(p, &sa_args)) != 0) {
  308                                 DPRINTF(("signal: sigaction failed: %d\n",
  309                                          error));
  310                                 return error;
  311                         }
  312                         if ((error = copyin(obsa, &sa, sizeof(sa))) != 0)
  313                                 return error;
  314                         p->p_retval[0] = (int)sa.sa_handler;
  315 
  316                         /* special sigset() check */
  317                         if(IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
  318                                 /* check to make sure signal is not blocked */
  319                                 if(sigismember(&p->p_sigmask, signum)) {
  320                                         /* return SIG_HOLD and unblock signal*/
  321                                         p->p_retval[0] = (int)IBCS2_SIG_HOLD;
  322                                         p->p_sigmask &= ~sigmask(signum);
  323                                 }
  324                                 
  325                         return 0;
  326                 }
  327                 
  328         case IBCS2_SIGRELSE_MASK:
  329                 {
  330                         struct sigprocmask_args sa;
  331 
  332                         SCARG(&sa, how) = SIG_UNBLOCK;
  333                         SCARG(&sa, mask) = sigmask(signum);
  334                         return sigprocmask(p, &sa);
  335                 }
  336                 
  337         case IBCS2_SIGIGNORE_MASK:
  338                 {
  339                         struct sigaction_args sa_args;
  340                         struct sigaction *bsa;
  341 
  342                         bsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  343                         SCARG(&sa_args, signum) = signum;
  344                         SCARG(&sa_args, nsa) = bsa;
  345                         SCARG(&sa_args, osa) = NULL;
  346 
  347                         sa.sa_handler = SIG_IGN;
  348                         sigemptyset(&sa.sa_mask);
  349                         sa.sa_flags = 0;
  350                         if ((error = copyout(&sa, bsa, sizeof(sa))) != 0)
  351                                 return error;
  352                         if ((error = sigaction(p, &sa_args)) != 0) {
  353                                 DPRINTF(("sigignore: sigaction failed\n"));
  354                                 return error;
  355                         }
  356                         return 0;
  357                 }
  358                 
  359         case IBCS2_SIGPAUSE_MASK:
  360                 {
  361                         struct sigsuspend_args sa;
  362 
  363                         SCARG(&sa, mask) = p->p_sigmask &~ sigmask(signum);
  364                         return sigsuspend(p, &sa);
  365                 }
  366                 
  367         default:
  368                 return ENOSYS;
  369         }
  370 }
  371 
  372 int
  373 ibcs2_sigprocmask(p, uap)
  374         register struct proc *p;
  375         struct ibcs2_sigprocmask_args *uap;
  376 {
  377         ibcs2_sigset_t iss;
  378         sigset_t bss;
  379         int error = 0;
  380 
  381         if (SCARG(uap, oset) != NULL) {
  382                 /* Fix the return value first if needed */
  383                 bsd_to_ibcs2_sigset(&p->p_sigmask, &iss);
  384                 if ((error = copyout(&iss, SCARG(uap, oset), sizeof(iss))) != 0)
  385                         return error;
  386         }
  387                 
  388         if (SCARG(uap, set) == NULL)
  389                 /* Just examine */
  390                 return 0;
  391 
  392         if ((error = copyin(SCARG(uap, set), &iss, sizeof(iss))) != 0)
  393                 return error;
  394 
  395         ibcs2_to_bsd_sigset(&iss, &bss);
  396 
  397         (void) splhigh();
  398 
  399         switch (SCARG(uap, how)) {
  400         case IBCS2_SIG_BLOCK:
  401                 p->p_sigmask |= bss & ~sigcantmask;
  402                 break;
  403 
  404         case IBCS2_SIG_UNBLOCK:
  405                 p->p_sigmask &= ~bss;
  406                 break;
  407 
  408         case IBCS2_SIG_SETMASK:
  409                 p->p_sigmask = bss & ~sigcantmask;
  410                 break;
  411 
  412         default:
  413                 error = EINVAL;
  414                 break;
  415         }
  416 
  417         (void) spl0();
  418 
  419         return error;
  420 }
  421 
  422 int
  423 ibcs2_sigpending(p, uap)
  424         register struct proc *p;
  425         struct ibcs2_sigpending_args *uap;
  426 {
  427         sigset_t bss;
  428         ibcs2_sigset_t iss;
  429 
  430         bss = p->p_siglist & p->p_sigmask;
  431         bsd_to_ibcs2_sigset(&bss, &iss);
  432 
  433         return copyout(&iss, SCARG(uap, mask), sizeof(iss));
  434 }
  435 
  436 int
  437 ibcs2_sigsuspend(p, uap)
  438         register struct proc *p;
  439         struct ibcs2_sigsuspend_args *uap;
  440 {
  441         ibcs2_sigset_t sss;
  442         sigset_t bss;
  443         struct sigsuspend_args sa;
  444         int error;
  445 
  446         if ((error = copyin(SCARG(uap, mask), &sss, sizeof(sss))) != 0)
  447                 return error;
  448 
  449         ibcs2_to_bsd_sigset(&sss, &bss);
  450 
  451         SCARG(&sa, mask) = bss;
  452         return sigsuspend(p, &sa);
  453 }
  454 
  455 int
  456 ibcs2_pause(p, uap)
  457         register struct proc *p;
  458         struct ibcs2_pause_args *uap;
  459 {
  460         struct sigsuspend_args bsa;
  461 
  462         SCARG(&bsa, mask) = p->p_sigmask;
  463         return sigsuspend(p, &bsa);
  464 }
  465 
  466 int
  467 ibcs2_kill(p, uap)
  468         register struct proc *p;
  469         struct ibcs2_kill_args *uap;
  470 {
  471         struct kill_args ka;
  472 
  473         SCARG(&ka, pid) = SCARG(uap, pid);
  474         SCARG(&ka, signum) = ibcs2_to_bsd_sig[SCARG(uap, signo)];
  475         return kill(p, &ka);
  476 }

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