kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / sys / signal2.h
CommitLineData
b1b4e5a6
SS
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 $
d1a7b618 35 * $DragonFly: src/sys/sys/signal2.h,v 1.3 2008/10/14 21:25:14 swildner Exp $
b1b4e5a6
SS
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.
94f98873
MD
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).
b1b4e5a6
SS
51 */
52static __inline sigset_t
53lwp_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.
94f98873
MD
64 *
65 * (p->p_token must be held, lp->lwp_spin must be held)
b1b4e5a6
SS
66 */
67static __inline void
68lwp_delsig(struct lwp *lp, int sig)
69{
70 SIGDELSET(lp->lwp_siglist, sig);
71 SIGDELSET(lp->lwp_proc->p_siglist, sig);
72}
73
f6e73860
SS
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)
b1b4e5a6
SS
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 *
5686ec5a
MD
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
b1b4e5a6
SS
87 */
88static __inline
89int
f6e73860 90__cursig(struct lwp *lp, int mayblock, int maytrace)
b1b4e5a6 91{
f6e73860 92 struct proc *p = lp->lwp_proc;
b1b4e5a6
SS
93 sigset_t tmpset;
94 int r;
95
b1b4e5a6
SS
96 tmpset = lwp_sigpend(lp);
97 SIGSETNAND(tmpset, lp->lwp_sigmask);
b1b4e5a6 98
f6e73860
SS
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 */
4643740a 106 if (!(mayblock && (p->p_flags & P_TRACED)))
f6e73860
SS
107 return (0);
108 }
b1b4e5a6 109
f6e73860
SS
110 if (mayblock)
111 r = issignal(lp, maytrace);
112 else
113 r = TRUE; /* simply state the fact */
114
115 return(r);
b1b4e5a6
SS
116}
117
118#endif