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: src/sys/i386/ibcs2/ibcs2_signal.c,v 1.6.4.2 1999/09/05 08:11:28 peter Exp $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/namei.h>
   34 #include <sys/proc.h>
   35 #include <sys/filedesc.h>
   36 #include <sys/ioctl.h>
   37 #include <sys/mount.h>
   38 #include <sys/kernel.h>
   39 #include <sys/signal.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/malloc.h>
   42 #include <sys/sysproto.h>
   43 
   44 #include <i386/ibcs2/ibcs2_types.h>
   45 #include <i386/ibcs2/ibcs2_signal.h>
   46 #include <i386/ibcs2/ibcs2_proto.h>
   47 #include <i386/ibcs2/ibcs2_xenix.h>
   48 #include <i386/ibcs2/ibcs2_util.h>
   49 
   50 #define sigemptyset(s)          bzero((s), sizeof(*(s)))
   51 #define sigismember(s, n)       (*(s) & sigmask(n))
   52 #define sigaddset(s, n)         (*(s) |= sigmask(n))
   53 
   54 #define ibcs2_sigmask(n)        (1 << ((n) - 1))
   55 #define ibcs2_sigemptyset(s)    bzero((s), sizeof(*(s)))
   56 #define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
   57 #define ibcs2_sigaddset(s, n)   (*(s) |= ibcs2_sigmask(n))
   58 
   59 static void ibcs2_to_bsd_sigset    __P((const ibcs2_sigset_t *, sigset_t *));
   60 static void bsd_to_ibcs2_sigset    __P((const sigset_t *, ibcs2_sigset_t *));
   61 static void ibcs2_to_bsd_sigaction __P((struct ibcs2_sigaction *,
   62                                         struct sigaction *));
   63 static void bsd_to_ibcs2_sigaction __P((struct sigaction *,
   64                                         struct ibcs2_sigaction *));
   65 
   66 int bsd_to_ibcs2_sig[] = {
   67         0,                      /* 0 */
   68         IBCS2_SIGHUP,           /* 1 */
   69         IBCS2_SIGINT,           /* 2 */
   70         IBCS2_SIGQUIT,          /* 3 */
   71         IBCS2_SIGILL,           /* 4 */
   72         IBCS2_SIGTRAP,          /* 5 */
   73         IBCS2_SIGABRT,          /* 6 */
   74         IBCS2_SIGEMT,           /* 7 */
   75         IBCS2_SIGFPE,           /* 8 */
   76         IBCS2_SIGKILL,          /* 9 */
   77         IBCS2_SIGBUS,           /* 10 */
   78         IBCS2_SIGSEGV,          /* 11 */
   79         IBCS2_SIGSYS,           /* 12 */
   80         IBCS2_SIGPIPE,          /* 13 */
   81         IBCS2_SIGALRM,          /* 14 */
   82         IBCS2_SIGTERM,          /* 15 */
   83         0,                      /* 16 - SIGURG */
   84         IBCS2_SIGSTOP,          /* 17 */
   85         IBCS2_SIGTSTP,          /* 18 */
   86         IBCS2_SIGCONT,          /* 19 */
   87         IBCS2_SIGCLD,           /* 20 */
   88         IBCS2_SIGTTIN,          /* 21 */
   89         IBCS2_SIGTTOU,          /* 22 */
   90         IBCS2_SIGPOLL,          /* 23 */
   91         0,                      /* 24 - SIGXCPU */
   92         0,                      /* 25 - SIGXFSZ */
   93         IBCS2_SIGVTALRM,        /* 26 */
   94         IBCS2_SIGPROF,          /* 27 */
   95         IBCS2_SIGWINCH,         /* 28 */
   96         0,                      /* 29 */
   97         IBCS2_SIGUSR1,          /* 30 */
   98         IBCS2_SIGUSR2,          /* 31 */
   99 };
  100 
  101 static int ibcs2_to_bsd_sig[] = {
  102         0,                      /* 0 */
  103         SIGHUP,                 /* 1 */
  104         SIGINT,                 /* 2 */
  105         SIGQUIT,                /* 3 */
  106         SIGILL,                 /* 4 */
  107         SIGTRAP,                /* 5 */
  108         SIGABRT,                /* 6 */
  109         SIGEMT,                 /* 7 */
  110         SIGFPE,                 /* 8 */
  111         SIGKILL,                /* 9 */
  112         SIGBUS,                 /* 10 */
  113         SIGSEGV,                /* 11 */
  114         SIGSYS,                 /* 12 */
  115         SIGPIPE,                /* 13 */
  116         SIGALRM,                /* 14 */
  117         SIGTERM,                /* 15 */
  118         SIGUSR1,                /* 16 */
  119         SIGUSR2,                /* 17 */
  120         SIGCHLD,                /* 18 */
  121         0,                      /* 19 - SIGPWR */
  122         SIGWINCH,               /* 20 */
  123         0,                      /* 21 */
  124         SIGIO,                  /* 22 */
  125         SIGSTOP,                /* 23 */
  126         SIGTSTP,                /* 24 */
  127         SIGCONT,                /* 25 */
  128         SIGTTIN,                /* 26 */
  129         SIGTTOU,                /* 27 */
  130         SIGVTALRM,              /* 28 */
  131         SIGPROF,                /* 29 */
  132         0,                      /* 30 */
  133         0,                      /* 31 */
  134 };
  135 
  136 void
  137 ibcs2_to_bsd_sigset(iss, bss)
  138         const ibcs2_sigset_t *iss;
  139         sigset_t *bss;
  140 {
  141         int i, newsig;
  142 
  143         sigemptyset(bss);
  144         for (i = 1; i < IBCS2_NSIG; i++) {
  145                 if (ibcs2_sigismember(iss, i)) {
  146                         newsig = ibcs2_to_bsd_sig[i];
  147                         if (newsig)
  148                                 sigaddset(bss, newsig);
  149                 }
  150         }
  151 }
  152 
  153 static void
  154 bsd_to_ibcs2_sigset(bss, iss)
  155         const sigset_t *bss;
  156         ibcs2_sigset_t *iss;
  157 {
  158         int i, newsig;
  159 
  160         ibcs2_sigemptyset(iss);
  161         for (i = 1; i < NSIG; i++) {
  162                 if (sigismember(bss, i)) {
  163                         newsig = bsd_to_ibcs2_sig[i];
  164                         if (newsig)
  165                                 ibcs2_sigaddset(iss, newsig);
  166                 }
  167         }
  168 }
  169 
  170 static void
  171 ibcs2_to_bsd_sigaction(isa, bsa)
  172         struct ibcs2_sigaction *isa;
  173         struct sigaction *bsa;
  174 {
  175 
  176         bsa->sa_handler = isa->sa_handler;
  177         ibcs2_to_bsd_sigset(&isa->sa_mask, &bsa->sa_mask);
  178         bsa->sa_flags = 0;      /* ??? SA_NODEFER */
  179         if ((isa->sa_flags & IBCS2_SA_NOCLDSTOP) != 0)
  180                 bsa->sa_flags |= SA_NOCLDSTOP;
  181 }
  182 
  183 static void
  184 bsd_to_ibcs2_sigaction(bsa, isa)
  185         struct sigaction *bsa;
  186         struct ibcs2_sigaction *isa;
  187 {
  188 
  189         isa->sa_handler = bsa->sa_handler;
  190         bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->sa_mask);
  191         isa->sa_flags = 0;
  192         if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
  193                 isa->sa_flags |= IBCS2_SA_NOCLDSTOP;
  194 }
  195 
  196 int
  197 ibcs2_sigaction(p, uap, retval)
  198         register struct proc *p;
  199         struct ibcs2_sigaction_args *uap;
  200         int *retval;
  201 {
  202         struct ibcs2_sigaction *nisa, *oisa, tmpisa;
  203         struct sigaction *nbsa, *obsa, tmpbsa;
  204         struct sigaction_args sa;
  205         caddr_t sg;
  206         int error;
  207 
  208         sg = stackgap_init();
  209         nisa = SCARG(uap, act);
  210         oisa = SCARG(uap, oact);
  211 
  212         if (oisa != NULL)
  213                 obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  214         else
  215                 obsa = NULL;
  216 
  217         if (nisa != NULL) {
  218                 nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  219                 if ((error = copyin(nisa, &tmpisa, sizeof(tmpisa))) != 0)
  220                         return error;
  221                 ibcs2_to_bsd_sigaction(&tmpisa, &tmpbsa);
  222                 if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
  223                         return error;
  224         } else
  225                 nbsa = NULL;
  226 
  227         SCARG(&sa, signum) = ibcs2_to_bsd_sig[SCARG(uap, sig)];
  228         SCARG(&sa, nsa) = nbsa;
  229         SCARG(&sa, osa) = obsa;
  230 
  231         if ((error = sigaction(p, &sa, retval)) != 0)
  232                 return error;
  233 
  234         if (oisa != NULL) {
  235                 if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
  236                         return error;
  237                 bsd_to_ibcs2_sigaction(&tmpbsa, &tmpisa);
  238                 if ((error = copyout(&tmpisa, oisa, sizeof(tmpisa))) != 0)
  239                         return error;
  240         }
  241 
  242         return 0;
  243 }
  244 
  245 int
  246 ibcs2_sigsys(p, uap, retval)
  247         register struct proc *p;
  248         struct ibcs2_sigsys_args *uap;
  249         int *retval;
  250 {
  251         struct sigaction sa;
  252         int signum = ibcs2_to_bsd_sig[IBCS2_SIGNO(SCARG(uap, sig))];
  253         int error;
  254         caddr_t sg = stackgap_init();
  255 
  256         if (signum <= 0 || signum >= IBCS2_NSIG) {
  257                 if (IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGNAL_MASK ||
  258                     IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
  259                         *retval = (int)IBCS2_SIG_ERR;
  260                 return EINVAL;
  261         }
  262         
  263         switch (IBCS2_SIGCALL(SCARG(uap, sig))) {
  264         case IBCS2_SIGSET_MASK:
  265                 /*
  266                  * Check for SIG_HOLD action.
  267                  * Otherwise, perform signal() except with different sa_flags.
  268                  */
  269                 if (SCARG(uap, fp) != IBCS2_SIG_HOLD) {
  270                         /* add sig to mask before exececuting signal handler */
  271                         sa.sa_flags = 0;
  272                         goto ibcs2_sigset;
  273                 }
  274                 /* else fallthrough to sighold */
  275 
  276         case IBCS2_SIGHOLD_MASK:
  277                 {
  278                         struct sigprocmask_args sa;
  279 
  280                         SCARG(&sa, how) = SIG_BLOCK;
  281                         SCARG(&sa, mask) = sigmask(signum);
  282                         return sigprocmask(p, &sa, retval);
  283                 }
  284                 
  285         case IBCS2_SIGNAL_MASK:
  286                 {
  287                         struct sigaction_args sa_args;
  288                         struct sigaction *nbsa, *obsa;
  289 
  290                         /* do not automatically block signal */
  291                         sa.sa_flags = SA_NODEFER;
  292 #ifdef SA_RESETHAND
  293                         if((signum != IBCS2_SIGILL) &&
  294                            (signum != IBCS2_SIGTRAP) &&
  295                            (signum != IBCS2_SIGPWR))
  296                                 /* set to SIG_DFL before executing handler */
  297                                 sa.sa_flags |= SA_RESETHAND;
  298 #endif
  299                 ibcs2_sigset:
  300                         nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  301                         obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  302                         SCARG(&sa_args, signum) = signum;
  303                         SCARG(&sa_args, nsa) = nbsa;
  304                         SCARG(&sa_args, osa) = obsa;
  305 
  306                         sa.sa_handler = SCARG(uap, fp);
  307                         sigemptyset(&sa.sa_mask);
  308 #if 0
  309                         if (signum != SIGALRM)
  310                                 sa.sa_flags |= SA_RESTART;
  311 #endif
  312                         *retval = (int)IBCS2_SIG_ERR; /* init error return */
  313 
  314                         /* perform native sigaction() */
  315                         if ((error = copyout(&sa, nbsa, sizeof(sa))) != 0)
  316                                 return error;
  317                         if ((error = sigaction(p, &sa_args, retval)) != 0) {
  318                                 DPRINTF(("signal: sigaction failed: %d\n",
  319                                          error));
  320                                 return error;
  321                         }
  322                         if ((error = copyin(obsa, &sa, sizeof(sa))) != 0)
  323                                 return error;
  324                         *retval = (int)sa.sa_handler;
  325 
  326                         /* special sigset() check */
  327                         if(IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
  328                                 /* check to make sure signal is not blocked */
  329                                 if(sigismember(&p->p_sigmask, signum)) {
  330                                         /* return SIG_HOLD and unblock signal*/
  331                                         *retval = (int)IBCS2_SIG_HOLD;
  332                                         p->p_sigmask &= ~sigmask(signum);
  333                                 }
  334                                 
  335                         return 0;
  336                 }
  337                 
  338         case IBCS2_SIGRELSE_MASK:
  339                 {
  340                         struct sigprocmask_args sa;
  341 
  342                         SCARG(&sa, how) = SIG_UNBLOCK;
  343                         SCARG(&sa, mask) = sigmask(signum);
  344                         return sigprocmask(p, &sa, retval);
  345                 }
  346                 
  347         case IBCS2_SIGIGNORE_MASK:
  348                 {
  349                         struct sigaction_args sa_args;
  350                         struct sigaction *bsa;
  351 
  352                         bsa = stackgap_alloc(&sg, sizeof(struct sigaction));
  353                         SCARG(&sa_args, signum) = signum;
  354                         SCARG(&sa_args, nsa) = bsa;
  355                         SCARG(&sa_args, osa) = NULL;
  356 
  357                         sa.sa_handler = SIG_IGN;
  358                         sigemptyset(&sa.sa_mask);
  359                         sa.sa_flags = 0;
  360                         if ((error = copyout(&sa, bsa, sizeof(sa))) != 0)
  361                                 return error;
  362                         if ((error = sigaction(p, &sa_args, retval)) != 0) {
  363                                 DPRINTF(("sigignore: sigaction failed\n"));
  364                                 return error;
  365                         }
  366                         return 0;
  367                 }
  368                 
  369         case IBCS2_SIGPAUSE_MASK:
  370                 {
  371                         struct sigsuspend_args sa;
  372 
  373                         SCARG(&sa, mask) = p->p_sigmask &~ sigmask(signum);
  374                         return sigsuspend(p, &sa, retval);
  375                 }
  376                 
  377         default:
  378                 return ENOSYS;
  379         }
  380 }
  381 
  382 int
  383 ibcs2_sigprocmask(p, uap, retval)
  384         register struct proc *p;
  385         struct ibcs2_sigprocmask_args *uap;
  386         int *retval;
  387 {
  388         ibcs2_sigset_t iss;
  389         sigset_t bss;
  390         int error = 0;
  391 
  392         if (SCARG(uap, oset) != NULL) {
  393                 /* Fix the return value first if needed */
  394                 bsd_to_ibcs2_sigset(&p->p_sigmask, &iss);
  395                 if ((error = copyout(&iss, SCARG(uap, oset), sizeof(iss))) != 0)
  396                         return error;
  397         }
  398                 
  399         if (SCARG(uap, set) == NULL)
  400                 /* Just examine */
  401                 return 0;
  402 
  403         if ((error = copyin(SCARG(uap, set), &iss, sizeof(iss))) != 0)
  404                 return error;
  405 
  406         ibcs2_to_bsd_sigset(&iss, &bss);
  407 
  408         (void) splhigh();
  409 
  410         switch (SCARG(uap, how)) {
  411         case IBCS2_SIG_BLOCK:
  412                 p->p_sigmask |= bss & ~sigcantmask;
  413                 break;
  414 
  415         case IBCS2_SIG_UNBLOCK:
  416                 p->p_sigmask &= ~bss;
  417                 break;
  418 
  419         case IBCS2_SIG_SETMASK:
  420                 p->p_sigmask = bss & ~sigcantmask;
  421                 break;
  422 
  423         default:
  424                 error = EINVAL;
  425                 break;
  426         }
  427 
  428         (void) spl0();
  429 
  430         return error;
  431 }
  432 
  433 int
  434 ibcs2_sigpending(p, uap, retval)
  435         register struct proc *p;
  436         struct ibcs2_sigpending_args *uap;
  437         int *retval;
  438 {
  439         sigset_t bss;
  440         ibcs2_sigset_t iss;
  441 
  442         bss = p->p_siglist & p->p_sigmask;
  443         bsd_to_ibcs2_sigset(&bss, &iss);
  444 
  445         return copyout(&iss, SCARG(uap, mask), sizeof(iss));
  446 }
  447 
  448 int
  449 ibcs2_sigsuspend(p, uap, retval)
  450         register struct proc *p;
  451         struct ibcs2_sigsuspend_args *uap;
  452         int *retval;
  453 {
  454         ibcs2_sigset_t sss;
  455         sigset_t bss;
  456         struct sigsuspend_args sa;
  457         int error;
  458 
  459         if ((error = copyin(SCARG(uap, mask), &sss, sizeof(sss))) != 0)
  460                 return error;
  461 
  462         ibcs2_to_bsd_sigset(&sss, &bss);
  463 
  464         SCARG(&sa, mask) = bss;
  465         return sigsuspend(p, &sa, retval);
  466 }
  467 
  468 int
  469 ibcs2_pause(p, uap, retval)
  470         register struct proc *p;
  471         struct ibcs2_pause_args *uap;
  472         int *retval;
  473 {
  474         struct sigsuspend_args bsa;
  475 
  476         SCARG(&bsa, mask) = p->p_sigmask;
  477         return sigsuspend(p, &bsa, retval);
  478 }
  479 
  480 int
  481 ibcs2_kill(p, uap, retval)
  482         register struct proc *p;
  483         struct ibcs2_kill_args *uap;
  484         int *retval;
  485 {
  486         struct kill_args ka;
  487 
  488         SCARG(&ka, pid) = SCARG(uap, pid);
  489         SCARG(&ka, signum) = ibcs2_to_bsd_sig[SCARG(uap, signo)];
  490         return kill(p, &ka, retval);
  491 }

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