text: /*-
   * Copyright (c) 2015 Dmitry Chagin
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/signalvar.h>
  
  #include <compat/linux/linux.h>
  
  
  static int bsd_to_linux_sigtbl[LINUX_SIGTBLSZ] = {
  	LINUX_SIGHUP,	/* SIGHUP */
  	LINUX_SIGINT,	/* SIGINT */
  	LINUX_SIGQUIT,	/* SIGQUIT */
  	LINUX_SIGILL,	/* SIGILL */
  	LINUX_SIGTRAP,	/* SIGTRAP */
  	LINUX_SIGABRT,	/* SIGABRT */
  	0,		/* SIGEMT */
  	LINUX_SIGFPE,	/* SIGFPE */
  	LINUX_SIGKILL,	/* SIGKILL */
  	LINUX_SIGBUS,	/* SIGBUS */
  	LINUX_SIGSEGV,	/* SIGSEGV */
  	LINUX_SIGSYS,	/* SIGSYS */
  	LINUX_SIGPIPE,	/* SIGPIPE */
  	LINUX_SIGALRM,	/* SIGALRM */
  	LINUX_SIGTERM,	/* SIGTERM */
  	LINUX_SIGURG,	/* SIGURG */
  	LINUX_SIGSTOP,	/* SIGSTOP */
  	LINUX_SIGTSTP,	/* SIGTSTP */
  	LINUX_SIGCONT,	/* SIGCONT */
  	LINUX_SIGCHLD,	/* SIGCHLD */
  	LINUX_SIGTTIN,	/* SIGTTIN */
  	LINUX_SIGTTOU,	/* SIGTTOU */
  	LINUX_SIGIO,	/* SIGIO */
  	LINUX_SIGXCPU,	/* SIGXCPU */
  	LINUX_SIGXFSZ,	/* SIGXFSZ */
  	LINUX_SIGVTALRM,/* SIGVTALRM */
  	LINUX_SIGPROF,	/* SIGPROF */
  	LINUX_SIGWINCH,	/* SIGWINCH */
  	0,		/* SIGINFO */
  	LINUX_SIGUSR1,	/* SIGUSR1 */
  	LINUX_SIGUSR2	/* SIGUSR2 */
  };
  
  static int linux_to_bsd_sigtbl[LINUX_SIGTBLSZ] = {
  	SIGHUP,		/* LINUX_SIGHUP */
  	SIGINT,		/* LINUX_SIGINT */
  	SIGQUIT,	/* LINUX_SIGQUIT */
  	SIGILL,		/* LINUX_SIGILL */
  	SIGTRAP,	/* LINUX_SIGTRAP */
  	SIGABRT,	/* LINUX_SIGABRT */
  	SIGBUS,		/* LINUX_SIGBUS */
  	SIGFPE,		/* LINUX_SIGFPE */
  	SIGKILL,	/* LINUX_SIGKILL */
  	SIGUSR1,	/* LINUX_SIGUSR1 */
  	SIGSEGV,	/* LINUX_SIGSEGV */
  	SIGUSR2,	/* LINUX_SIGUSR2 */
  	SIGPIPE,	/* LINUX_SIGPIPE */
  	SIGALRM,	/* LINUX_SIGALRM */
  	SIGTERM,	/* LINUX_SIGTERM */
  	SIGBUS,		/* LINUX_SIGSTKFLT */
  	SIGCHLD,	/* LINUX_SIGCHLD */
  	SIGCONT,	/* LINUX_SIGCONT */
  	SIGSTOP,	/* LINUX_SIGSTOP */
  	SIGTSTP,	/* LINUX_SIGTSTP */
  	SIGTTIN,	/* LINUX_SIGTTIN */
  	SIGTTOU,	/* LINUX_SIGTTOU */
  	SIGURG,		/* LINUX_SIGURG */
  	SIGXCPU,	/* LINUX_SIGXCPU */
  	SIGXFSZ,	/* LINUX_SIGXFSZ */
  	SIGVTALRM,	/* LINUX_SIGVTALARM */
  	SIGPROF,	/* LINUX_SIGPROF */
  	SIGWINCH,	/* LINUX_SIGWINCH */
  	SIGIO,		/* LINUX_SIGIO */
  	/*
  	 * FreeBSD does not have SIGPWR signal, map Linux SIGPWR signal
  	 * to the first unused FreeBSD signal number. Since Linux supports
  	 * signals from 1 to 64 we are ok here as our SIGRTMIN = 65.
  	 */
  	SIGRTMIN,	/* LINUX_SIGPWR */
  	SIGSYS		/* LINUX_SIGSYS */
  };
  
  /*
   * Map Linux RT signals to the FreeBSD RT signals.
   */
  static inline int
  linux_to_bsd_rt_signal(int sig)
  {
  
  	return (SIGRTMIN + 1 + sig - LINUX_SIGRTMIN);
  }
  
  static inline int
  bsd_to_linux_rt_signal(int sig)
  {
  
  	return (sig - SIGRTMIN - 1 + LINUX_SIGRTMIN);
  }
  
  int
  linux_to_bsd_signal(int sig)
  {
  
  	KASSERT(sig > 0 && sig <= LINUX_SIGRTMAX, ("Invalid Linux signal\n"));
  
  	if (sig < LINUX_SIGRTMIN)
  		return (linux_to_bsd_sigtbl[_SIG_IDX(sig)]);
  
  	return (linux_to_bsd_rt_signal(sig));
  }
  
  int
  bsd_to_linux_signal(int sig)
  {
  
  	if (sig <= LINUX_SIGTBLSZ)
  		return (bsd_to_linux_sigtbl[_SIG_IDX(sig)]);
  	if (sig == SIGRTMIN)
  		return (LINUX_SIGPWR);
  
  	return (bsd_to_linux_rt_signal(sig));
  }
  
  int
  linux_to_bsd_sigaltstack(int lsa)
  {
  	int bsa = 0;
  
  	if (lsa & LINUX_SS_DISABLE)
  		bsa |= SS_DISABLE;
  	/*
  	 * Linux ignores SS_ONSTACK flag for ss
  	 * parameter while FreeBSD prohibits it.
  	 */
  	return (bsa);
  }
  
  int
  bsd_to_linux_sigaltstack(int bsa)
  {
  	int lsa = 0;
  
  	if (bsa & SS_DISABLE)
  		lsa |= LINUX_SS_DISABLE;
  	if (bsa & SS_ONSTACK)
  		lsa |= LINUX_SS_ONSTACK;
  	return (lsa);
  }
  
  void
  linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
  {
  	int b, l;
  
  	SIGEMPTYSET(*bss);
  	for (l = 1; l <= LINUX_SIGRTMAX; l++) {
  		if (LINUX_SIGISMEMBER(*lss, l)) {
  			b = linux_to_bsd_signal(l);
  			if (b)
  				SIGADDSET(*bss, b);
  		}
  	}
  }
  
  void
  bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
  {
  	int b, l;
  
  	LINUX_SIGEMPTYSET(*lss);
  	for (b = 1; b <= SIGRTMAX; b++) {
  		if (SIGISMEMBER(*bss, b)) {
  			l = bsd_to_linux_signal(b);
  			if (l)
  				LINUX_SIGADDSET(*lss, l);
  		}
  	}
  }
  