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/sys/signal2.h

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    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  * (Does not need to be interlocked with lwp_spin.  If caller holds a
   50  *  critical section races will be resolved through an AST).
   51  */
   52 static __inline sigset_t
   53 lwp_sigpend(struct lwp *lp)
   54 {
   55         sigset_t set;
   56 
   57         set = lp->lwp_proc->p_siglist;
   58         SIGSETOR(set, lp->lwp_siglist);
   59         return (set);
   60 }
   61 
   62 /*
   63  * Mark a signal as handled by the lwp.
   64  *
   65  * (p->p_token must be held, lp->lwp_spin must be held)
   66  */
   67 static __inline void
   68 lwp_delsig(struct lwp *lp, int sig)
   69 {
   70         SIGDELSET(lp->lwp_siglist, sig);
   71         SIGDELSET(lp->lwp_proc->p_siglist, sig);
   72 }
   73 
   74 #define CURSIG(lp)              __cursig(lp, 1, 0)
   75 #define CURSIG_TRACE(lp)        __cursig(lp, 1, 1)
   76 #define CURSIG_NOBLOCK(lp)      __cursig(lp, 0, 0)
   77 
   78 /*
   79  * Determine signal that should be delivered to process p, the current
   80  * process, 0 if none.  If there is a pending stop signal with default
   81  * action, the process stops in issignal().
   82  *
   83  * This function does not interlock pending signals.  If the caller needs
   84  * to interlock the caller must acquire the per-proc token.
   85  *
   86  * MPSAFE
   87  */
   88 static __inline
   89 int
   90 __cursig(struct lwp *lp, int mayblock, int maytrace)
   91 {
   92         struct proc *p = lp->lwp_proc;
   93         sigset_t tmpset;
   94         int r;
   95 
   96         tmpset = lwp_sigpend(lp);
   97         SIGSETNAND(tmpset, lp->lwp_sigmask);
   98 
   99         /* Nothing interesting happening? */
  100         if (SIGISEMPTY(tmpset)) {
  101                 /*
  102                  * Quit here, unless
  103                  *  a) we may block and
  104                  *  b) somebody is tracing us.
  105                  */
  106                 if (!(mayblock && (p->p_flags & P_TRACED)))
  107                         return (0);
  108         }
  109 
  110         if (mayblock)
  111                 r = issignal(lp, maytrace);
  112         else
  113                 r = TRUE;       /* simply state the fact */
  114 
  115         return(r);
  116 }
  117 
  118 #endif

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