sys/sys/signal2.h

   1 /*
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
  34  * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
  35  * $DragonFly: src/sys/sys/signal2.h,v 1.3 2008/10/14 21:25:14 swildner Exp $
  36  */
  37
  38 #ifndef _SYS_SIGNAL2_H
  39 #define _SYS_SIGNAL2_H
  40
  41 #include <sys/proc.h>
  42
  43 /*
  44  * Inline functions:
  45  */
  46 /*
  47  * Determine which signals are pending for a lwp.
  48  */
  49 static __inline sigset_t
  50 lwp_sigpend(struct lwp *lp)
  51 {
  52         sigset_t set;
  53
  54         set = lp->lwp_proc->p_siglist;
  55         SIGSETOR(set, lp->lwp_siglist);
  56         return (set);
  57 }
  58
  59 /*
  60  * Mark a signal as handled by the lwp.
  61  */
  62 static __inline void
  63 lwp_delsig(struct lwp *lp, int sig)
  64 {
  65         SIGDELSET(lp->lwp_siglist, sig);
  66         SIGDELSET(lp->lwp_proc->p_siglist, sig);
  67 }
  68
  69 #define CURSIG(lp)              __cursig(lp, 1, 0)
  70 #define CURSIG_TRACE(lp)        __cursig(lp, 1, 1)
  71 #define CURSIG_NOBLOCK(lp)      __cursig(lp, 0, 0)
  72
  73 /*
  74  * Determine signal that should be delivered to process p, the current
  75  * process, 0 if none.  If there is a pending stop signal with default
  76  * action, the process stops in issignal().
  77  *
  78  * MP SAFE
  79  */
  80 static __inline
  81 int
  82 __cursig(struct lwp *lp, int mayblock, int maytrace)
  83 {
  84         struct proc *p = lp->lwp_proc;
  85         sigset_t tmpset;
  86         int r;
  87
  88         tmpset = lwp_sigpend(lp);
  89         SIGSETNAND(tmpset, lp->lwp_sigmask);
  90
  91         /* Nothing interesting happening? */
  92         if (SIGISEMPTY(tmpset)) {
  93                 /*
  94                  * Quit here, unless
  95                  *  a) we may block and
  96                  *  b) somebody is tracing us.
  97                  */
  98                 if (!(mayblock && (p->p_flag & P_TRACED)))
  99                         return (0);
 100         }
 101
 102         if (mayblock)
 103                 r = issignal(lp, maytrace);
 104         else
 105                 r = TRUE;       /* simply state the fact */
 106
 107         return(r);
 108 }
 109
 110 #endif