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 119