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/compat/linux/linux.c

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    1 /*-
    2  * Copyright (c) 2015 Dmitry Chagin
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.0/sys/compat/linux/linux.c 283474 2015-05-24 17:47:20Z dchagin $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/signalvar.h>
   33 
   34 #include <compat/linux/linux.h>
   35 
   36 
   37 static int bsd_to_linux_sigtbl[LINUX_SIGTBLSZ] = {
   38         LINUX_SIGHUP,   /* SIGHUP */
   39         LINUX_SIGINT,   /* SIGINT */
   40         LINUX_SIGQUIT,  /* SIGQUIT */
   41         LINUX_SIGILL,   /* SIGILL */
   42         LINUX_SIGTRAP,  /* SIGTRAP */
   43         LINUX_SIGABRT,  /* SIGABRT */
   44         0,              /* SIGEMT */
   45         LINUX_SIGFPE,   /* SIGFPE */
   46         LINUX_SIGKILL,  /* SIGKILL */
   47         LINUX_SIGBUS,   /* SIGBUS */
   48         LINUX_SIGSEGV,  /* SIGSEGV */
   49         LINUX_SIGSYS,   /* SIGSYS */
   50         LINUX_SIGPIPE,  /* SIGPIPE */
   51         LINUX_SIGALRM,  /* SIGALRM */
   52         LINUX_SIGTERM,  /* SIGTERM */
   53         LINUX_SIGURG,   /* SIGURG */
   54         LINUX_SIGSTOP,  /* SIGSTOP */
   55         LINUX_SIGTSTP,  /* SIGTSTP */
   56         LINUX_SIGCONT,  /* SIGCONT */
   57         LINUX_SIGCHLD,  /* SIGCHLD */
   58         LINUX_SIGTTIN,  /* SIGTTIN */
   59         LINUX_SIGTTOU,  /* SIGTTOU */
   60         LINUX_SIGIO,    /* SIGIO */
   61         LINUX_SIGXCPU,  /* SIGXCPU */
   62         LINUX_SIGXFSZ,  /* SIGXFSZ */
   63         LINUX_SIGVTALRM,/* SIGVTALRM */
   64         LINUX_SIGPROF,  /* SIGPROF */
   65         LINUX_SIGWINCH, /* SIGWINCH */
   66         0,              /* SIGINFO */
   67         LINUX_SIGUSR1,  /* SIGUSR1 */
   68         LINUX_SIGUSR2   /* SIGUSR2 */
   69 };
   70 
   71 static int linux_to_bsd_sigtbl[LINUX_SIGTBLSZ] = {
   72         SIGHUP,         /* LINUX_SIGHUP */
   73         SIGINT,         /* LINUX_SIGINT */
   74         SIGQUIT,        /* LINUX_SIGQUIT */
   75         SIGILL,         /* LINUX_SIGILL */
   76         SIGTRAP,        /* LINUX_SIGTRAP */
   77         SIGABRT,        /* LINUX_SIGABRT */
   78         SIGBUS,         /* LINUX_SIGBUS */
   79         SIGFPE,         /* LINUX_SIGFPE */
   80         SIGKILL,        /* LINUX_SIGKILL */
   81         SIGUSR1,        /* LINUX_SIGUSR1 */
   82         SIGSEGV,        /* LINUX_SIGSEGV */
   83         SIGUSR2,        /* LINUX_SIGUSR2 */
   84         SIGPIPE,        /* LINUX_SIGPIPE */
   85         SIGALRM,        /* LINUX_SIGALRM */
   86         SIGTERM,        /* LINUX_SIGTERM */
   87         SIGBUS,         /* LINUX_SIGSTKFLT */
   88         SIGCHLD,        /* LINUX_SIGCHLD */
   89         SIGCONT,        /* LINUX_SIGCONT */
   90         SIGSTOP,        /* LINUX_SIGSTOP */
   91         SIGTSTP,        /* LINUX_SIGTSTP */
   92         SIGTTIN,        /* LINUX_SIGTTIN */
   93         SIGTTOU,        /* LINUX_SIGTTOU */
   94         SIGURG,         /* LINUX_SIGURG */
   95         SIGXCPU,        /* LINUX_SIGXCPU */
   96         SIGXFSZ,        /* LINUX_SIGXFSZ */
   97         SIGVTALRM,      /* LINUX_SIGVTALARM */
   98         SIGPROF,        /* LINUX_SIGPROF */
   99         SIGWINCH,       /* LINUX_SIGWINCH */
  100         SIGIO,          /* LINUX_SIGIO */
  101         /*
  102          * FreeBSD does not have SIGPWR signal, map Linux SIGPWR signal
  103          * to the first unused FreeBSD signal number. Since Linux supports
  104          * signals from 1 to 64 we are ok here as our SIGRTMIN = 65.
  105          */
  106         SIGRTMIN,       /* LINUX_SIGPWR */
  107         SIGSYS          /* LINUX_SIGSYS */
  108 };
  109 
  110 /*
  111  * Map Linux RT signals to the FreeBSD RT signals.
  112  */
  113 static inline int
  114 linux_to_bsd_rt_signal(int sig)
  115 {
  116 
  117         return (SIGRTMIN + 1 + sig - LINUX_SIGRTMIN);
  118 }
  119 
  120 static inline int
  121 bsd_to_linux_rt_signal(int sig)
  122 {
  123 
  124         return (sig - SIGRTMIN - 1 + LINUX_SIGRTMIN);
  125 }
  126 
  127 int
  128 linux_to_bsd_signal(int sig)
  129 {
  130 
  131         KASSERT(sig > 0 && sig <= LINUX_SIGRTMAX, ("Invalid Linux signal\n"));
  132 
  133         if (sig < LINUX_SIGRTMIN)
  134                 return (linux_to_bsd_sigtbl[_SIG_IDX(sig)]);
  135 
  136         return (linux_to_bsd_rt_signal(sig));
  137 }
  138 
  139 int
  140 bsd_to_linux_signal(int sig)
  141 {
  142 
  143         if (sig <= LINUX_SIGTBLSZ)
  144                 return (bsd_to_linux_sigtbl[_SIG_IDX(sig)]);
  145         if (sig == SIGRTMIN)
  146                 return (LINUX_SIGPWR);
  147 
  148         return (bsd_to_linux_rt_signal(sig));
  149 }
  150 
  151 int
  152 linux_to_bsd_sigaltstack(int lsa)
  153 {
  154         int bsa = 0;
  155 
  156         if (lsa & LINUX_SS_DISABLE)
  157                 bsa |= SS_DISABLE;
  158         /*
  159          * Linux ignores SS_ONSTACK flag for ss
  160          * parameter while FreeBSD prohibits it.
  161          */
  162         return (bsa);
  163 }
  164 
  165 int
  166 bsd_to_linux_sigaltstack(int bsa)
  167 {
  168         int lsa = 0;
  169 
  170         if (bsa & SS_DISABLE)
  171                 lsa |= LINUX_SS_DISABLE;
  172         if (bsa & SS_ONSTACK)
  173                 lsa |= LINUX_SS_ONSTACK;
  174         return (lsa);
  175 }
  176 
  177 void
  178 linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
  179 {
  180         int b, l;
  181 
  182         SIGEMPTYSET(*bss);
  183         for (l = 1; l <= LINUX_SIGRTMAX; l++) {
  184                 if (LINUX_SIGISMEMBER(*lss, l)) {
  185                         b = linux_to_bsd_signal(l);
  186                         if (b)
  187                                 SIGADDSET(*bss, b);
  188                 }
  189         }
  190 }
  191 
  192 void
  193 bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
  194 {
  195         int b, l;
  196 
  197         LINUX_SIGEMPTYSET(*lss);
  198         for (b = 1; b <= SIGRTMAX; b++) {
  199                 if (SIGISMEMBER(*bss, b)) {
  200                         l = bsd_to_linux_signal(b);
  201                         if (l)
  202                                 LINUX_SIGADDSET(*lss, l);
  203                 }
  204         }
  205 }

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