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: releng/5.1/sys/i386/ibcs2/ibcs2_signal.c 113859 2003-04-22 18:23:49Z jhb $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/signalvar.h>
   36 #include <sys/syscallsubr.h>
   37 #include <sys/sysproto.h>
   38 
   39 #include <i386/ibcs2/ibcs2_types.h>
   40 #include <i386/ibcs2/ibcs2_signal.h>
   41 #include <i386/ibcs2/ibcs2_proto.h>
   42 #include <i386/ibcs2/ibcs2_xenix.h>
   43 #include <i386/ibcs2/ibcs2_util.h>
   44 
   45 #define sigemptyset(s)          SIGEMPTYSET(*(s))
   46 #define sigismember(s, n)       SIGISMEMBER(*(s), n)
   47 #define sigaddset(s, n)         SIGADDSET(*(s), n)
   48 
   49 #define ibcs2_sigmask(n)        (1 << ((n) - 1))
   50 #define ibcs2_sigemptyset(s)    bzero((s), sizeof(*(s)))
   51 #define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
   52 #define ibcs2_sigaddset(s, n)   (*(s) |= ibcs2_sigmask(n))
   53 
   54 static void ibcs2_to_bsd_sigset(const ibcs2_sigset_t *, sigset_t *);
   55 static void bsd_to_ibcs2_sigset(const sigset_t *, ibcs2_sigset_t *);
   56 static void ibcs2_to_bsd_sigaction(struct ibcs2_sigaction *,
   57                                         struct sigaction *);
   58 static void bsd_to_ibcs2_sigaction(struct sigaction *,
   59                                         struct ibcs2_sigaction *);
   60 
   61 int bsd_to_ibcs2_sig[IBCS2_SIGTBLSZ] = {
   62         IBCS2_SIGHUP,           /* 1 */
   63         IBCS2_SIGINT,           /* 2 */
   64         IBCS2_SIGQUIT,          /* 3 */
   65         IBCS2_SIGILL,           /* 4 */
   66         IBCS2_SIGTRAP,          /* 5 */
   67         IBCS2_SIGABRT,          /* 6 */
   68         IBCS2_SIGEMT,           /* 7 */
   69         IBCS2_SIGFPE,           /* 8 */
   70         IBCS2_SIGKILL,          /* 9 */
   71         IBCS2_SIGBUS,           /* 10 */
   72         IBCS2_SIGSEGV,          /* 11 */
   73         IBCS2_SIGSYS,           /* 12 */
   74         IBCS2_SIGPIPE,          /* 13 */
   75         IBCS2_SIGALRM,          /* 14 */
   76         IBCS2_SIGTERM,          /* 15 */
   77         0,                      /* 16 - SIGURG */
   78         IBCS2_SIGSTOP,          /* 17 */
   79         IBCS2_SIGTSTP,          /* 18 */
   80         IBCS2_SIGCONT,          /* 19 */
   81         IBCS2_SIGCLD,           /* 20 */
   82         IBCS2_SIGTTIN,          /* 21 */
   83         IBCS2_SIGTTOU,          /* 22 */
   84         IBCS2_SIGPOLL,          /* 23 */
   85         0,                      /* 24 - SIGXCPU */
   86         0,                      /* 25 - SIGXFSZ */
   87         IBCS2_SIGVTALRM,        /* 26 */
   88         IBCS2_SIGPROF,          /* 27 */
   89         IBCS2_SIGWINCH,         /* 28 */
   90         0,                      /* 29 */
   91         IBCS2_SIGUSR1,          /* 30 */
   92         IBCS2_SIGUSR2,          /* 31 */
   93         0                       /* 32 */
   94 };
   95 
   96 static int ibcs2_to_bsd_sig[IBCS2_SIGTBLSZ] = {
   97         SIGHUP,                 /* 1 */
   98         SIGINT,                 /* 2 */
   99         SIGQUIT,                /* 3 */
  100         SIGILL,                 /* 4 */
  101         SIGTRAP,                /* 5 */
  102         SIGABRT,                /* 6 */
  103         SIGEMT,                 /* 7 */
  104         SIGFPE,                 /* 8 */
  105         SIGKILL,                /* 9 */
  106         SIGBUS,                 /* 10 */
  107         SIGSEGV,                /* 11 */
  108         SIGSYS,                 /* 12 */
  109         SIGPIPE,                /* 13 */
  110         SIGALRM,                /* 14 */
  111         SIGTERM,                /* 15 */
  112         SIGUSR1,                /* 16 */
  113         SIGUSR2,                /* 17 */
  114         SIGCHLD,                /* 18 */
  115         0,                      /* 19 - SIGPWR */
  116         SIGWINCH,               /* 20 */
  117         0,                      /* 21 */
  118         SIGIO,                  /* 22 */
  119         SIGSTOP,                /* 23 */
  120         SIGTSTP,                /* 24 */
  121         SIGCONT,                /* 25 */
  122         SIGTTIN,                /* 26 */
  123         SIGTTOU,                /* 27 */
  124         SIGVTALRM,              /* 28 */
  125         SIGPROF,                /* 29 */
  126         0,                      /* 30 */
  127         0,                      /* 31 */
  128         0                       /* 32 */
  129 };
  130 
  131 void
  132 ibcs2_to_bsd_sigset(iss, bss)
  133         const ibcs2_sigset_t *iss;
  134         sigset_t *bss;
  135 {
  136         int i, newsig;
  137 
  138         sigemptyset(bss);
  139         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  140                 if (ibcs2_sigismember(iss, i)) {
  141                         newsig = ibcs2_to_bsd_sig[_SIG_IDX(i)];
  142                         if (newsig)
  143                                 sigaddset(bss, newsig);
  144                 }
  145         }
  146 }
  147 
  148 static void
  149 bsd_to_ibcs2_sigset(bss, iss)
  150         const sigset_t *bss;
  151         ibcs2_sigset_t *iss;
  152 {
  153         int i, newsig;
  154 
  155         ibcs2_sigemptyset(iss);
  156         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  157                 if (sigismember(bss, i)) {
  158                         newsig = bsd_to_ibcs2_sig[_SIG_IDX(i)];
  159                         if (newsig)
  160                                 ibcs2_sigaddset(iss, newsig);
  161                 }
  162         }
  163 }
  164 
  165 static void
  166 ibcs2_to_bsd_sigaction(isa, bsa)
  167         struct ibcs2_sigaction *isa;
  168         struct sigaction *bsa;
  169 {
  170 
  171         bsa->sa_handler = isa->isa_handler;
  172         ibcs2_to_bsd_sigset(&isa->isa_mask, &bsa->sa_mask);
  173         bsa->sa_flags = 0;      /* ??? SA_NODEFER */
  174         if ((isa->isa_flags & IBCS2_SA_NOCLDSTOP) != 0)
  175                 bsa->sa_flags |= SA_NOCLDSTOP;
  176 }
  177 
  178 static void
  179 bsd_to_ibcs2_sigaction(bsa, isa)
  180         struct sigaction *bsa;
  181         struct ibcs2_sigaction *isa;
  182 {
  183 
  184         isa->isa_handler = bsa->sa_handler;
  185         bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->isa_mask);
  186         isa->isa_flags = 0;
  187         if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
  188                 isa->isa_flags |= IBCS2_SA_NOCLDSTOP;
  189 }
  190 
  191 int
  192 ibcs2_sigaction(td, uap)
  193         register struct thread *td;
  194         struct ibcs2_sigaction_args *uap;
  195 {
  196         struct ibcs2_sigaction isa;
  197         struct sigaction nbsa, obsa;
  198         struct sigaction *nbsap;
  199         int error;
  200 
  201         if (uap->act != NULL) {
  202                 if ((error = copyin(uap->act, &isa, sizeof(isa))) != 0)
  203                         return (error);
  204                 ibcs2_to_bsd_sigaction(&isa, &nbsa);
  205                 nbsap = &nbsa;
  206         } else
  207                 nbsap = NULL;
  208         error = kern_sigaction(td, ibcs2_to_bsd_sig[_SIG_IDX(uap->sig)], &nbsa,
  209             &obsa, 0);
  210         if (error == 0 && uap->oact != NULL) {
  211                 bsd_to_ibcs2_sigaction(&obsa, &isa);
  212                 error = copyout(&isa, uap->oact, sizeof(isa));
  213         }
  214         return (error);
  215 }
  216 
  217 int
  218 ibcs2_sigsys(td, uap)
  219         register struct thread *td;
  220         struct ibcs2_sigsys_args *uap;
  221 {
  222         struct proc *p = td->td_proc;
  223         struct sigaction sa;
  224         int signum = ibcs2_to_bsd_sig[_SIG_IDX(IBCS2_SIGNO(uap->sig))];
  225         int error;
  226 
  227         if (signum <= 0 || signum >= IBCS2_NSIG) {
  228                 if (IBCS2_SIGCALL(uap->sig) == IBCS2_SIGNAL_MASK ||
  229                     IBCS2_SIGCALL(uap->sig) == IBCS2_SIGSET_MASK)
  230                         td->td_retval[0] = (int)IBCS2_SIG_ERR;
  231                 return EINVAL;
  232         }
  233         
  234         switch (IBCS2_SIGCALL(uap->sig)) {
  235         case IBCS2_SIGSET_MASK:
  236                 /*
  237                  * Check for SIG_HOLD action.
  238                  * Otherwise, perform signal() except with different sa_flags.
  239                  */
  240                 if (uap->fp != IBCS2_SIG_HOLD) {
  241                         /* add sig to mask before exececuting signal handler */
  242                         sa.sa_flags = 0;
  243                         goto ibcs2_sigset;
  244                 }
  245                 /* else FALLTHROUGH to sighold */
  246 
  247         case IBCS2_SIGHOLD_MASK:
  248                 {
  249                         sigset_t mask;
  250 
  251                         SIGEMPTYSET(mask);
  252                         SIGADDSET(mask, signum);
  253                         return (kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
  254                                     0));
  255                 }
  256                 
  257         case IBCS2_SIGNAL_MASK:
  258                 {
  259                         struct sigaction osa;
  260 
  261                         /* do not automatically block signal */
  262                         sa.sa_flags = SA_NODEFER;
  263 #ifdef SA_RESETHAND
  264                         if((signum != IBCS2_SIGILL) &&
  265                            (signum != IBCS2_SIGTRAP) &&
  266                            (signum != IBCS2_SIGPWR))
  267                                 /* set to SIG_DFL before executing handler */
  268                                 sa.sa_flags |= SA_RESETHAND;
  269 #endif
  270                 ibcs2_sigset:
  271                         sa.sa_handler = uap->fp;
  272                         sigemptyset(&sa.sa_mask);
  273 #if 0
  274                         if (signum != SIGALRM)
  275                                 sa.sa_flags |= SA_RESTART;
  276 #endif
  277                         error = kern_sigaction(td, signum, &sa, &osa, 0);
  278                         if (error != 0) {
  279                                 DPRINTF(("signal: sigaction failed: %d\n",
  280                                          error));
  281                                 td->td_retval[0] = (int)IBCS2_SIG_ERR;
  282                                 return (error);
  283                         }
  284                         td->td_retval[0] = (int)osa.sa_handler;
  285 
  286                         /* special sigset() check */
  287                         if(IBCS2_SIGCALL(uap->sig) == IBCS2_SIGSET_MASK) {
  288                                 PROC_LOCK(p);
  289                                 /* check to make sure signal is not blocked */
  290                                 if(sigismember(&td->td_sigmask, signum)) {
  291                                         /* return SIG_HOLD and unblock signal*/
  292                                         td->td_retval[0] = (int)IBCS2_SIG_HOLD;
  293                                         SIGDELSET(td->td_sigmask, signum);
  294                                         signotify(td);
  295                                 }
  296                                 PROC_UNLOCK(p);
  297                         }
  298                                 
  299                         return 0;
  300                 }
  301                 
  302         case IBCS2_SIGRELSE_MASK:
  303                 {
  304                         sigset_t mask;
  305 
  306                         SIGEMPTYSET(mask);
  307                         SIGADDSET(mask, signum);
  308                         return (kern_sigprocmask(td, SIG_UNBLOCK, &mask, NULL,
  309                                     0));
  310                 }
  311                 
  312         case IBCS2_SIGIGNORE_MASK:
  313                 {
  314                         sa.sa_handler = SIG_IGN;
  315                         sigemptyset(&sa.sa_mask);
  316                         sa.sa_flags = 0;
  317                         error = kern_sigaction(td, signum, &sa, NULL, 0);
  318                         if (error != 0)
  319                                 DPRINTF(("sigignore: sigaction failed\n"));
  320                         return (error);
  321                 }
  322                 
  323         case IBCS2_SIGPAUSE_MASK:
  324                 {
  325                         sigset_t mask;
  326 
  327                         PROC_LOCK(p);
  328                         mask = td->td_sigmask;
  329                         PROC_UNLOCK(p);
  330                         SIGDELSET(mask, signum);
  331                         return kern_sigsuspend(td, mask);
  332                 }
  333                 
  334         default:
  335                 return ENOSYS;
  336         }
  337 }
  338 
  339 int
  340 ibcs2_sigprocmask(td, uap)
  341         register struct thread *td;
  342         struct ibcs2_sigprocmask_args *uap;
  343 {
  344         ibcs2_sigset_t iss;
  345         sigset_t oss, nss;
  346         sigset_t *nssp;
  347         int error, how;
  348 
  349         switch (uap->how) {
  350         case IBCS2_SIG_BLOCK:
  351                 how = SIG_BLOCK;
  352                 break;
  353         case IBCS2_SIG_UNBLOCK:
  354                 how = SIG_UNBLOCK;
  355                 break;
  356         case IBCS2_SIG_SETMASK:
  357                 how = SIG_SETMASK;
  358                 break;
  359         default:
  360                 return (EINVAL);
  361         }
  362         if (uap->set != NULL) {
  363                 if ((error = copyin(uap->set, &iss, sizeof(iss))) != 0)
  364                         return error;
  365                 ibcs2_to_bsd_sigset(&iss, &nss);
  366                 nssp = &nss;
  367         } else
  368                 nssp = NULL;
  369         error = kern_sigprocmask(td, how, nssp, &oss, 0);
  370         if (error == 0 && uap->oset != NULL) {
  371                 bsd_to_ibcs2_sigset(&oss, &iss);
  372                 error = copyout(&iss, uap->oset, sizeof(iss));
  373         }
  374         return (error);
  375 }
  376 
  377 int
  378 ibcs2_sigpending(td, uap)
  379         register struct thread *td;
  380         struct ibcs2_sigpending_args *uap;
  381 {
  382         struct proc *p = td->td_proc;
  383         sigset_t bss;
  384         ibcs2_sigset_t iss;
  385 
  386         PROC_LOCK(p);
  387         bss = td->td_siglist;
  388         SIGSETOR(bss, p->p_siglist);
  389         SIGSETAND(bss, td->td_sigmask);
  390         PROC_UNLOCK(p);
  391         bsd_to_ibcs2_sigset(&bss, &iss);
  392 
  393         return copyout(&iss, uap->mask, sizeof(iss));
  394 }
  395 
  396 int
  397 ibcs2_sigsuspend(td, uap)
  398         register struct thread *td;
  399         struct ibcs2_sigsuspend_args *uap;
  400 {
  401         ibcs2_sigset_t sss;
  402         sigset_t bss;
  403         int error;
  404 
  405         if ((error = copyin(uap->mask, &sss, sizeof(sss))) != 0)
  406                 return error;
  407 
  408         ibcs2_to_bsd_sigset(&sss, &bss);
  409         return kern_sigsuspend(td, bss);
  410 }
  411 
  412 int
  413 ibcs2_pause(td, uap)
  414         register struct thread *td;
  415         struct ibcs2_pause_args *uap;
  416 {
  417         sigset_t mask;
  418 
  419         PROC_LOCK(td->td_proc);
  420         mask = td->td_sigmask;
  421         PROC_UNLOCK(td->td_proc);
  422         return kern_sigsuspend(td, mask);
  423 }
  424 
  425 int
  426 ibcs2_kill(td, uap)
  427         register struct thread *td;
  428         struct ibcs2_kill_args *uap;
  429 {
  430         struct kill_args ka;
  431 
  432         ka.pid = uap->pid;
  433         ka.signum = ibcs2_to_bsd_sig[_SIG_IDX(uap->signo)];
  434         return kill(td, &ka);
  435 }

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