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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
  30  * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
  31  * $DragonFly: src/sys/sys/signal2.h,v 1.3 2008/10/14 21:25:14 swildner Exp $
  32  */
  33
  34 #ifndef _SYS_SIGNAL2_H
  35 #define _SYS_SIGNAL2_H
  36
  37 #include <sys/proc.h>
  38
  39 /*
  40  * Inline functions:
  41  */
  42 /*
  43  * Determine which signals are pending for a lwp.
  44  *
  45  * (Does not need to be interlocked with lwp_spin.  If caller holds a
  46  *  critical section races will be resolved through an AST).
  47  */
  48 static __inline sigset_t
  49 lwp_sigpend(struct lwp *lp)
  50 {
  51         sigset_t set;
  52
  53         set = lp->lwp_proc->p_siglist;
  54         SIGSETOR(set, lp->lwp_siglist);
  55         return (set);
  56 }
  57
  58 /*
  59  * Mark a signal as handled by the lwp.
  60  *
  61  * (p->p_token must be held, lp->lwp_spin must be held)
  62  */
  63 static __inline void
  64 lwp_delsig(struct lwp *lp, int sig)
  65 {
  66         SIGDELSET(lp->lwp_siglist, sig);
  67         SIGDELSET(lp->lwp_proc->p_siglist, sig);
  68 }
  69
  70 #define CURSIG(lp)              __cursig(lp, 1, 0)
  71 #define CURSIG_TRACE(lp)        __cursig(lp, 1, 1)
  72 #define CURSIG_NOBLOCK(lp)      __cursig(lp, 0, 0)
  73
  74 /*
  75  * Determine signal that should be delivered to process p, the current
  76  * process, 0 if none.  If there is a pending stop signal with default
  77  * action, the process stops in issignal().
  78  *
  79  * This function does not interlock pending signals.  If the caller needs
  80  * to interlock the caller must acquire the per-proc token.
  81  *
  82  * MPSAFE
  83  */
  84 static __inline
  85 int
  86 __cursig(struct lwp *lp, int mayblock, int maytrace)
  87 {
  88         struct proc *p = lp->lwp_proc;
  89         sigset_t tmpset;
  90         int r;
  91
  92         tmpset = lwp_sigpend(lp);
  93         SIGSETNAND(tmpset, lp->lwp_sigmask);
  94
  95         /* Nothing interesting happening? */
  96         if (SIGISEMPTY(tmpset)) {
  97                 /*
  98                  * Quit here, unless
  99                  *  a) we may block and
 100                  *  b) somebody is tracing us.
 101                  */
 102                 if (!(mayblock && (p->p_flags & P_TRACED)))
 103                         return (0);
 104         }
 105
 106         if (mayblock)
 107                 r = issignal(lp, maytrace);
 108         else
 109                 r = TRUE;       /* simply state the fact */
 110
 111         return(r);
 112 }
 113
 114 #endif