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 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/11/sys/i386/ibcs2/ibcs2_signal.c 331722 2018-03-29 02:50:57Z eadler $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/signalvar.h>
   37 #include <sys/syscallsubr.h>
   38 #include <sys/sysproto.h>
   39 
   40 #include <i386/ibcs2/ibcs2_types.h>
   41 #include <i386/ibcs2/ibcs2_signal.h>
   42 #include <i386/ibcs2/ibcs2_proto.h>
   43 #include <i386/ibcs2/ibcs2_xenix.h>
   44 #include <i386/ibcs2/ibcs2_util.h>
   45 
   46 #define sigemptyset(s)          SIGEMPTYSET(*(s))
   47 #define sigismember(s, n)       SIGISMEMBER(*(s), n)
   48 #define sigaddset(s, n)         SIGADDSET(*(s), n)
   49 
   50 #define ibcs2_sigmask(n)        (1 << ((n) - 1))
   51 #define ibcs2_sigemptyset(s)    bzero((s), sizeof(*(s)))
   52 #define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
   53 #define ibcs2_sigaddset(s, n)   (*(s) |= ibcs2_sigmask(n))
   54 
   55 static void ibcs2_to_bsd_sigset(const ibcs2_sigset_t *, sigset_t *);
   56 static void bsd_to_ibcs2_sigset(const sigset_t *, ibcs2_sigset_t *);
   57 static void ibcs2_to_bsd_sigaction(struct ibcs2_sigaction *,
   58                                         struct sigaction *);
   59 static void bsd_to_ibcs2_sigaction(struct sigaction *,
   60                                         struct ibcs2_sigaction *);
   61 
   62 int bsd_to_ibcs2_sig[IBCS2_SIGTBLSZ] = {
   63         IBCS2_SIGHUP,           /* 1 */
   64         IBCS2_SIGINT,           /* 2 */
   65         IBCS2_SIGQUIT,          /* 3 */
   66         IBCS2_SIGILL,           /* 4 */
   67         IBCS2_SIGTRAP,          /* 5 */
   68         IBCS2_SIGABRT,          /* 6 */
   69         IBCS2_SIGEMT,           /* 7 */
   70         IBCS2_SIGFPE,           /* 8 */
   71         IBCS2_SIGKILL,          /* 9 */
   72         IBCS2_SIGBUS,           /* 10 */
   73         IBCS2_SIGSEGV,          /* 11 */
   74         IBCS2_SIGSYS,           /* 12 */
   75         IBCS2_SIGPIPE,          /* 13 */
   76         IBCS2_SIGALRM,          /* 14 */
   77         IBCS2_SIGTERM,          /* 15 */
   78         0,                      /* 16 - SIGURG */
   79         IBCS2_SIGSTOP,          /* 17 */
   80         IBCS2_SIGTSTP,          /* 18 */
   81         IBCS2_SIGCONT,          /* 19 */
   82         IBCS2_SIGCLD,           /* 20 */
   83         IBCS2_SIGTTIN,          /* 21 */
   84         IBCS2_SIGTTOU,          /* 22 */
   85         IBCS2_SIGPOLL,          /* 23 */
   86         0,                      /* 24 - SIGXCPU */
   87         0,                      /* 25 - SIGXFSZ */
   88         IBCS2_SIGVTALRM,        /* 26 */
   89         IBCS2_SIGPROF,          /* 27 */
   90         IBCS2_SIGWINCH,         /* 28 */
   91         0,                      /* 29 */
   92         IBCS2_SIGUSR1,          /* 30 */
   93         IBCS2_SIGUSR2,          /* 31 */
   94         0                       /* 32 */
   95 };
   96 
   97 static int ibcs2_to_bsd_sig[IBCS2_SIGTBLSZ] = {
   98         SIGHUP,                 /* 1 */
   99         SIGINT,                 /* 2 */
  100         SIGQUIT,                /* 3 */
  101         SIGILL,                 /* 4 */
  102         SIGTRAP,                /* 5 */
  103         SIGABRT,                /* 6 */
  104         SIGEMT,                 /* 7 */
  105         SIGFPE,                 /* 8 */
  106         SIGKILL,                /* 9 */
  107         SIGBUS,                 /* 10 */
  108         SIGSEGV,                /* 11 */
  109         SIGSYS,                 /* 12 */
  110         SIGPIPE,                /* 13 */
  111         SIGALRM,                /* 14 */
  112         SIGTERM,                /* 15 */
  113         SIGUSR1,                /* 16 */
  114         SIGUSR2,                /* 17 */
  115         SIGCHLD,                /* 18 */
  116         0,                      /* 19 - SIGPWR */
  117         SIGWINCH,               /* 20 */
  118         0,                      /* 21 */
  119         SIGIO,                  /* 22 */
  120         SIGSTOP,                /* 23 */
  121         SIGTSTP,                /* 24 */
  122         SIGCONT,                /* 25 */
  123         SIGTTIN,                /* 26 */
  124         SIGTTOU,                /* 27 */
  125         SIGVTALRM,              /* 28 */
  126         SIGPROF,                /* 29 */
  127         0,                      /* 30 */
  128         0,                      /* 31 */
  129         0                       /* 32 */
  130 };
  131 
  132 void
  133 ibcs2_to_bsd_sigset(iss, bss)
  134         const ibcs2_sigset_t *iss;
  135         sigset_t *bss;
  136 {
  137         int i, newsig;
  138 
  139         sigemptyset(bss);
  140         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  141                 if (ibcs2_sigismember(iss, i)) {
  142                         newsig = ibcs2_to_bsd_sig[_SIG_IDX(i)];
  143                         if (newsig)
  144                                 sigaddset(bss, newsig);
  145                 }
  146         }
  147 }
  148 
  149 static void
  150 bsd_to_ibcs2_sigset(bss, iss)
  151         const sigset_t *bss;
  152         ibcs2_sigset_t *iss;
  153 {
  154         int i, newsig;
  155 
  156         ibcs2_sigemptyset(iss);
  157         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  158                 if (sigismember(bss, i)) {
  159                         newsig = bsd_to_ibcs2_sig[_SIG_IDX(i)];
  160                         if (newsig)
  161                                 ibcs2_sigaddset(iss, newsig);
  162                 }
  163         }
  164 }
  165 
  166 static void
  167 ibcs2_to_bsd_sigaction(isa, bsa)
  168         struct ibcs2_sigaction *isa;
  169         struct sigaction *bsa;
  170 {
  171 
  172         bsa->sa_handler = isa->isa_handler;
  173         ibcs2_to_bsd_sigset(&isa->isa_mask, &bsa->sa_mask);
  174         bsa->sa_flags = 0;      /* ??? SA_NODEFER */
  175         if ((isa->isa_flags & IBCS2_SA_NOCLDSTOP) != 0)
  176                 bsa->sa_flags |= SA_NOCLDSTOP;
  177 }
  178 
  179 static void
  180 bsd_to_ibcs2_sigaction(bsa, isa)
  181         struct sigaction *bsa;
  182         struct ibcs2_sigaction *isa;
  183 {
  184 
  185         isa->isa_handler = bsa->sa_handler;
  186         bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->isa_mask);
  187         isa->isa_flags = 0;
  188         if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
  189                 isa->isa_flags |= IBCS2_SA_NOCLDSTOP;
  190 }
  191 
  192 int
  193 ibcs2_sigaction(struct thread *td, struct ibcs2_sigaction_args *uap)
  194 {
  195         struct ibcs2_sigaction isa;
  196         struct sigaction nbsa, obsa;
  197         struct sigaction *nbsap;
  198         int error;
  199 
  200         if (uap->act != NULL) {
  201                 if ((error = copyin(uap->act, &isa, sizeof(isa))) != 0)
  202                         return (error);
  203                 ibcs2_to_bsd_sigaction(&isa, &nbsa);
  204                 nbsap = &nbsa;
  205         } else
  206                 nbsap = NULL;
  207         if (uap->sig <= 0 || uap->sig > IBCS2_NSIG)
  208                 return (EINVAL);
  209         error = kern_sigaction(td, ibcs2_to_bsd_sig[_SIG_IDX(uap->sig)], &nbsa,
  210             &obsa, 0);
  211         if (error == 0 && uap->oact != NULL) {
  212                 bsd_to_ibcs2_sigaction(&obsa, &isa);
  213                 error = copyout(&isa, uap->oact, sizeof(isa));
  214         }
  215         return (error);
  216 }
  217 
  218 int
  219 ibcs2_sigsys(struct thread *td, struct ibcs2_sigsys_args *uap)
  220 {
  221         struct proc *p = td->td_proc;
  222         struct sigaction sa;
  223         int signum = IBCS2_SIGNO(uap->sig);
  224         int error;
  225 
  226         if (signum <= 0 || signum > IBCS2_NSIG) {
  227                 if (IBCS2_SIGCALL(uap->sig) == IBCS2_SIGNAL_MASK ||
  228                     IBCS2_SIGCALL(uap->sig) == IBCS2_SIGSET_MASK)
  229                         td->td_retval[0] = (int)IBCS2_SIG_ERR;
  230                 return EINVAL;
  231         }
  232         signum = ibcs2_to_bsd_sig[_SIG_IDX(signum)];
  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(struct thread *td, struct ibcs2_sigprocmask_args *uap)
  341 {
  342         ibcs2_sigset_t iss;
  343         sigset_t oss, nss;
  344         sigset_t *nssp;
  345         int error, how;
  346 
  347         switch (uap->how) {
  348         case IBCS2_SIG_BLOCK:
  349                 how = SIG_BLOCK;
  350                 break;
  351         case IBCS2_SIG_UNBLOCK:
  352                 how = SIG_UNBLOCK;
  353                 break;
  354         case IBCS2_SIG_SETMASK:
  355                 how = SIG_SETMASK;
  356                 break;
  357         default:
  358                 return (EINVAL);
  359         }
  360         if (uap->set != NULL) {
  361                 if ((error = copyin(uap->set, &iss, sizeof(iss))) != 0)
  362                         return error;
  363                 ibcs2_to_bsd_sigset(&iss, &nss);
  364                 nssp = &nss;
  365         } else
  366                 nssp = NULL;
  367         error = kern_sigprocmask(td, how, nssp, &oss, 0);
  368         if (error == 0 && uap->oset != NULL) {
  369                 bsd_to_ibcs2_sigset(&oss, &iss);
  370                 error = copyout(&iss, uap->oset, sizeof(iss));
  371         }
  372         return (error);
  373 }
  374 
  375 int
  376 ibcs2_sigpending(struct thread *td, struct ibcs2_sigpending_args *uap)
  377 {
  378         struct proc *p = td->td_proc;
  379         sigset_t bss;
  380         ibcs2_sigset_t iss;
  381 
  382         PROC_LOCK(p);
  383         bss = td->td_siglist;
  384         SIGSETOR(bss, p->p_siglist);
  385         SIGSETAND(bss, td->td_sigmask);
  386         PROC_UNLOCK(p);
  387         bsd_to_ibcs2_sigset(&bss, &iss);
  388 
  389         return copyout(&iss, uap->mask, sizeof(iss));
  390 }
  391 
  392 int
  393 ibcs2_sigsuspend(struct thread *td, struct ibcs2_sigsuspend_args *uap)
  394 {
  395         ibcs2_sigset_t sss;
  396         sigset_t bss;
  397         int error;
  398 
  399         if ((error = copyin(uap->mask, &sss, sizeof(sss))) != 0)
  400                 return error;
  401 
  402         ibcs2_to_bsd_sigset(&sss, &bss);
  403         return kern_sigsuspend(td, bss);
  404 }
  405 
  406 int
  407 ibcs2_pause(struct thread *td, struct ibcs2_pause_args *uap)
  408 {
  409         sigset_t mask;
  410 
  411         PROC_LOCK(td->td_proc);
  412         mask = td->td_sigmask;
  413         PROC_UNLOCK(td->td_proc);
  414         return kern_sigsuspend(td, mask);
  415 }
  416 
  417 int
  418 ibcs2_kill(struct thread *td, struct ibcs2_kill_args *uap)
  419 {
  420         struct kill_args ka;
  421 
  422         if (uap->signo <= 0 || uap->signo > IBCS2_NSIG)
  423                 return (EINVAL);
  424         ka.pid = uap->pid;
  425         ka.signum = ibcs2_to_bsd_sig[_SIG_IDX(uap->signo)];
  426         return sys_kill(td, &ka);
  427 }

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