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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1995 Scott Bartram
    5  * Copyright (c) 1995 Steven Wallace
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/12.0/sys/i386/ibcs2/ibcs2_signal.c 326260 2017-11-27 15:08:52Z pfg $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/syscallsubr.h>
   40 #include <sys/sysproto.h>
   41 
   42 #include <i386/ibcs2/ibcs2_types.h>
   43 #include <i386/ibcs2/ibcs2_signal.h>
   44 #include <i386/ibcs2/ibcs2_proto.h>
   45 #include <i386/ibcs2/ibcs2_xenix.h>
   46 #include <i386/ibcs2/ibcs2_util.h>
   47 
   48 #define sigemptyset(s)          SIGEMPTYSET(*(s))
   49 #define sigismember(s, n)       SIGISMEMBER(*(s), n)
   50 #define sigaddset(s, n)         SIGADDSET(*(s), n)
   51 
   52 #define ibcs2_sigmask(n)        (1 << ((n) - 1))
   53 #define ibcs2_sigemptyset(s)    bzero((s), sizeof(*(s)))
   54 #define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
   55 #define ibcs2_sigaddset(s, n)   (*(s) |= ibcs2_sigmask(n))
   56 
   57 static void ibcs2_to_bsd_sigset(const ibcs2_sigset_t *, sigset_t *);
   58 static void bsd_to_ibcs2_sigset(const sigset_t *, ibcs2_sigset_t *);
   59 static void ibcs2_to_bsd_sigaction(struct ibcs2_sigaction *,
   60                                         struct sigaction *);
   61 static void bsd_to_ibcs2_sigaction(struct sigaction *,
   62                                         struct ibcs2_sigaction *);
   63 
   64 int bsd_to_ibcs2_sig[IBCS2_SIGTBLSZ] = {
   65         IBCS2_SIGHUP,           /* 1 */
   66         IBCS2_SIGINT,           /* 2 */
   67         IBCS2_SIGQUIT,          /* 3 */
   68         IBCS2_SIGILL,           /* 4 */
   69         IBCS2_SIGTRAP,          /* 5 */
   70         IBCS2_SIGABRT,          /* 6 */
   71         IBCS2_SIGEMT,           /* 7 */
   72         IBCS2_SIGFPE,           /* 8 */
   73         IBCS2_SIGKILL,          /* 9 */
   74         IBCS2_SIGBUS,           /* 10 */
   75         IBCS2_SIGSEGV,          /* 11 */
   76         IBCS2_SIGSYS,           /* 12 */
   77         IBCS2_SIGPIPE,          /* 13 */
   78         IBCS2_SIGALRM,          /* 14 */
   79         IBCS2_SIGTERM,          /* 15 */
   80         0,                      /* 16 - SIGURG */
   81         IBCS2_SIGSTOP,          /* 17 */
   82         IBCS2_SIGTSTP,          /* 18 */
   83         IBCS2_SIGCONT,          /* 19 */
   84         IBCS2_SIGCLD,           /* 20 */
   85         IBCS2_SIGTTIN,          /* 21 */
   86         IBCS2_SIGTTOU,          /* 22 */
   87         IBCS2_SIGPOLL,          /* 23 */
   88         0,                      /* 24 - SIGXCPU */
   89         0,                      /* 25 - SIGXFSZ */
   90         IBCS2_SIGVTALRM,        /* 26 */
   91         IBCS2_SIGPROF,          /* 27 */
   92         IBCS2_SIGWINCH,         /* 28 */
   93         0,                      /* 29 */
   94         IBCS2_SIGUSR1,          /* 30 */
   95         IBCS2_SIGUSR2,          /* 31 */
   96         0                       /* 32 */
   97 };
   98 
   99 static int ibcs2_to_bsd_sig[IBCS2_SIGTBLSZ] = {
  100         SIGHUP,                 /* 1 */
  101         SIGINT,                 /* 2 */
  102         SIGQUIT,                /* 3 */
  103         SIGILL,                 /* 4 */
  104         SIGTRAP,                /* 5 */
  105         SIGABRT,                /* 6 */
  106         SIGEMT,                 /* 7 */
  107         SIGFPE,                 /* 8 */
  108         SIGKILL,                /* 9 */
  109         SIGBUS,                 /* 10 */
  110         SIGSEGV,                /* 11 */
  111         SIGSYS,                 /* 12 */
  112         SIGPIPE,                /* 13 */
  113         SIGALRM,                /* 14 */
  114         SIGTERM,                /* 15 */
  115         SIGUSR1,                /* 16 */
  116         SIGUSR2,                /* 17 */
  117         SIGCHLD,                /* 18 */
  118         0,                      /* 19 - SIGPWR */
  119         SIGWINCH,               /* 20 */
  120         0,                      /* 21 */
  121         SIGIO,                  /* 22 */
  122         SIGSTOP,                /* 23 */
  123         SIGTSTP,                /* 24 */
  124         SIGCONT,                /* 25 */
  125         SIGTTIN,                /* 26 */
  126         SIGTTOU,                /* 27 */
  127         SIGVTALRM,              /* 28 */
  128         SIGPROF,                /* 29 */
  129         0,                      /* 30 */
  130         0,                      /* 31 */
  131         0                       /* 32 */
  132 };
  133 
  134 void
  135 ibcs2_to_bsd_sigset(iss, bss)
  136         const ibcs2_sigset_t *iss;
  137         sigset_t *bss;
  138 {
  139         int i, newsig;
  140 
  141         sigemptyset(bss);
  142         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  143                 if (ibcs2_sigismember(iss, i)) {
  144                         newsig = ibcs2_to_bsd_sig[_SIG_IDX(i)];
  145                         if (newsig)
  146                                 sigaddset(bss, newsig);
  147                 }
  148         }
  149 }
  150 
  151 static void
  152 bsd_to_ibcs2_sigset(bss, iss)
  153         const sigset_t *bss;
  154         ibcs2_sigset_t *iss;
  155 {
  156         int i, newsig;
  157 
  158         ibcs2_sigemptyset(iss);
  159         for (i = 1; i <= IBCS2_SIGTBLSZ; i++) {
  160                 if (sigismember(bss, i)) {
  161                         newsig = bsd_to_ibcs2_sig[_SIG_IDX(i)];
  162                         if (newsig)
  163                                 ibcs2_sigaddset(iss, newsig);
  164                 }
  165         }
  166 }
  167 
  168 static void
  169 ibcs2_to_bsd_sigaction(isa, bsa)
  170         struct ibcs2_sigaction *isa;
  171         struct sigaction *bsa;
  172 {
  173 
  174         bsa->sa_handler = isa->isa_handler;
  175         ibcs2_to_bsd_sigset(&isa->isa_mask, &bsa->sa_mask);
  176         bsa->sa_flags = 0;      /* ??? SA_NODEFER */
  177         if ((isa->isa_flags & IBCS2_SA_NOCLDSTOP) != 0)
  178                 bsa->sa_flags |= SA_NOCLDSTOP;
  179 }
  180 
  181 static void
  182 bsd_to_ibcs2_sigaction(bsa, isa)
  183         struct sigaction *bsa;
  184         struct ibcs2_sigaction *isa;
  185 {
  186 
  187         isa->isa_handler = bsa->sa_handler;
  188         bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->isa_mask);
  189         isa->isa_flags = 0;
  190         if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
  191                 isa->isa_flags |= IBCS2_SA_NOCLDSTOP;
  192 }
  193 
  194 int
  195 ibcs2_sigaction(struct thread *td, struct ibcs2_sigaction_args *uap)
  196 {
  197         struct ibcs2_sigaction isa;
  198         struct sigaction nbsa, obsa;
  199         struct sigaction *nbsap;
  200         int error;
  201 
  202         if (uap->act != NULL) {
  203                 if ((error = copyin(uap->act, &isa, sizeof(isa))) != 0)
  204                         return (error);
  205                 ibcs2_to_bsd_sigaction(&isa, &nbsa);
  206                 nbsap = &nbsa;
  207         } else
  208                 nbsap = NULL;
  209         if (uap->sig <= 0 || uap->sig > IBCS2_NSIG)
  210                 return (EINVAL);
  211         error = kern_sigaction(td, ibcs2_to_bsd_sig[_SIG_IDX(uap->sig)], &nbsa,
  212             &obsa, 0);
  213         if (error == 0 && uap->oact != NULL) {
  214                 bsd_to_ibcs2_sigaction(&obsa, &isa);
  215                 error = copyout(&isa, uap->oact, sizeof(isa));
  216         }
  217         return (error);
  218 }
  219 
  220 int
  221 ibcs2_sigsys(struct thread *td, struct ibcs2_sigsys_args *uap)
  222 {
  223         struct proc *p = td->td_proc;
  224         struct sigaction sa;
  225         int signum = IBCS2_SIGNO(uap->sig);
  226         int error;
  227 
  228         if (signum <= 0 || signum > IBCS2_NSIG) {
  229                 if (IBCS2_SIGCALL(uap->sig) == IBCS2_SIGNAL_MASK ||
  230                     IBCS2_SIGCALL(uap->sig) == IBCS2_SIGSET_MASK)
  231                         td->td_retval[0] = (int)IBCS2_SIG_ERR;
  232                 return EINVAL;
  233         }
  234         signum = ibcs2_to_bsd_sig[_SIG_IDX(signum)];
  235         
  236         switch (IBCS2_SIGCALL(uap->sig)) {
  237         case IBCS2_SIGSET_MASK:
  238                 /*
  239                  * Check for SIG_HOLD action.
  240                  * Otherwise, perform signal() except with different sa_flags.
  241                  */
  242                 if (uap->fp != IBCS2_SIG_HOLD) {
  243                         /* add sig to mask before exececuting signal handler */
  244                         sa.sa_flags = 0;
  245                         goto ibcs2_sigset;
  246                 }
  247                 /* else FALLTHROUGH to sighold */
  248 
  249         case IBCS2_SIGHOLD_MASK:
  250                 {
  251                         sigset_t mask;
  252 
  253                         SIGEMPTYSET(mask);
  254                         SIGADDSET(mask, signum);
  255                         return (kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
  256                                     0));
  257                 }
  258                 
  259         case IBCS2_SIGNAL_MASK:
  260                 {
  261                         struct sigaction osa;
  262 
  263                         /* do not automatically block signal */
  264                         sa.sa_flags = SA_NODEFER;
  265 #ifdef SA_RESETHAND
  266                         if((signum != IBCS2_SIGILL) &&
  267                            (signum != IBCS2_SIGTRAP) &&
  268                            (signum != IBCS2_SIGPWR))
  269                                 /* set to SIG_DFL before executing handler */
  270                                 sa.sa_flags |= SA_RESETHAND;
  271 #endif
  272                 ibcs2_sigset:
  273                         sa.sa_handler = uap->fp;
  274                         sigemptyset(&sa.sa_mask);
  275 #if 0
  276                         if (signum != SIGALRM)
  277                                 sa.sa_flags |= SA_RESTART;
  278 #endif
  279                         error = kern_sigaction(td, signum, &sa, &osa, 0);
  280                         if (error != 0) {
  281                                 DPRINTF(("signal: sigaction failed: %d\n",
  282                                          error));
  283                                 td->td_retval[0] = (int)IBCS2_SIG_ERR;
  284                                 return (error);
  285                         }
  286                         td->td_retval[0] = (int)osa.sa_handler;
  287 
  288                         /* special sigset() check */
  289                         if(IBCS2_SIGCALL(uap->sig) == IBCS2_SIGSET_MASK) {
  290                                 PROC_LOCK(p);
  291                                 /* check to make sure signal is not blocked */
  292                                 if(sigismember(&td->td_sigmask, signum)) {
  293                                         /* return SIG_HOLD and unblock signal*/
  294                                         td->td_retval[0] = (int)IBCS2_SIG_HOLD;
  295                                         SIGDELSET(td->td_sigmask, signum);
  296                                         signotify(td);
  297                                 }
  298                                 PROC_UNLOCK(p);
  299                         }
  300                                 
  301                         return 0;
  302                 }
  303                 
  304         case IBCS2_SIGRELSE_MASK:
  305                 {
  306                         sigset_t mask;
  307 
  308                         SIGEMPTYSET(mask);
  309                         SIGADDSET(mask, signum);
  310                         return (kern_sigprocmask(td, SIG_UNBLOCK, &mask, NULL,
  311                                     0));
  312                 }
  313                 
  314         case IBCS2_SIGIGNORE_MASK:
  315                 {
  316                         sa.sa_handler = SIG_IGN;
  317                         sigemptyset(&sa.sa_mask);
  318                         sa.sa_flags = 0;
  319                         error = kern_sigaction(td, signum, &sa, NULL, 0);
  320                         if (error != 0)
  321                                 DPRINTF(("sigignore: sigaction failed\n"));
  322                         return (error);
  323                 }
  324                 
  325         case IBCS2_SIGPAUSE_MASK:
  326                 {
  327                         sigset_t mask;
  328 
  329                         PROC_LOCK(p);
  330                         mask = td->td_sigmask;
  331                         PROC_UNLOCK(p);
  332                         SIGDELSET(mask, signum);
  333                         return kern_sigsuspend(td, mask);
  334                 }
  335                 
  336         default:
  337                 return ENOSYS;
  338         }
  339 }
  340 
  341 int
  342 ibcs2_sigprocmask(struct thread *td, 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(struct thread *td, struct ibcs2_sigpending_args *uap)
  379 {
  380         struct proc *p = td->td_proc;
  381         sigset_t bss;
  382         ibcs2_sigset_t iss;
  383 
  384         PROC_LOCK(p);
  385         bss = td->td_siglist;
  386         SIGSETOR(bss, p->p_siglist);
  387         SIGSETAND(bss, td->td_sigmask);
  388         PROC_UNLOCK(p);
  389         bsd_to_ibcs2_sigset(&bss, &iss);
  390 
  391         return copyout(&iss, uap->mask, sizeof(iss));
  392 }
  393 
  394 int
  395 ibcs2_sigsuspend(struct thread *td, struct ibcs2_sigsuspend_args *uap)
  396 {
  397         ibcs2_sigset_t sss;
  398         sigset_t bss;
  399         int error;
  400 
  401         if ((error = copyin(uap->mask, &sss, sizeof(sss))) != 0)
  402                 return error;
  403 
  404         ibcs2_to_bsd_sigset(&sss, &bss);
  405         return kern_sigsuspend(td, bss);
  406 }
  407 
  408 int
  409 ibcs2_pause(struct thread *td, struct ibcs2_pause_args *uap)
  410 {
  411         sigset_t mask;
  412 
  413         PROC_LOCK(td->td_proc);
  414         mask = td->td_sigmask;
  415         PROC_UNLOCK(td->td_proc);
  416         return kern_sigsuspend(td, mask);
  417 }
  418 
  419 int
  420 ibcs2_kill(struct thread *td, struct ibcs2_kill_args *uap)
  421 {
  422         struct kill_args ka;
  423 
  424         if (uap->signo <= 0 || uap->signo > IBCS2_NSIG)
  425                 return (EINVAL);
  426         ka.pid = uap->pid;
  427         ka.signum = ibcs2_to_bsd_sig[_SIG_IDX(uap->signo)];
  428         return sys_kill(td, &ka);
  429 }

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