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 115