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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. | |
2c64e990 | 13 | * 3. Neither the name of the University nor the names of its contributors |
b1b4e5a6 SS |
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 $ | |
b1b4e5a6 SS |
31 | */ |
32 | ||
c0b79d00 SW |
33 | #ifndef _SYS_SIGNAL2_H_ |
34 | #define _SYS_SIGNAL2_H_ | |
b1b4e5a6 | 35 | |
c0b79d00 | 36 | #include <sys/param.h> |
b1b4e5a6 | 37 | #include <sys/proc.h> |
c0b79d00 | 38 | #include <sys/signalvar.h> |
b1b4e5a6 SS |
39 | |
40 | /* | |
41 | * Inline functions: | |
42 | */ | |
43 | /* | |
44 | * Determine which signals are pending for a lwp. | |
94f98873 MD |
45 | * |
46 | * (Does not need to be interlocked with lwp_spin. If caller holds a | |
47 | * critical section races will be resolved through an AST). | |
b1b4e5a6 SS |
48 | */ |
49 | static __inline sigset_t | |
50 | lwp_sigpend(struct lwp *lp) | |
51 | { | |
52 | sigset_t set; | |
53 | ||
54 | set = lp->lwp_proc->p_siglist; | |
55 | SIGSETOR(set, lp->lwp_siglist); | |
a094cc95 | 56 | |
b1b4e5a6 SS |
57 | return (set); |
58 | } | |
59 | ||
60 | /* | |
61 | * Mark a signal as handled by the lwp. | |
94f98873 MD |
62 | * |
63 | * (p->p_token must be held, lp->lwp_spin must be held) | |
b1b4e5a6 SS |
64 | */ |
65 | static __inline void | |
a094cc95 | 66 | lwp_delsig(struct lwp *lp, int sig, int fromproc) |
b1b4e5a6 SS |
67 | { |
68 | SIGDELSET(lp->lwp_siglist, sig); | |
a094cc95 MD |
69 | if (fromproc) |
70 | SIGDELSET_ATOMIC(lp->lwp_proc->p_siglist, sig); | |
b1b4e5a6 SS |
71 | } |
72 | ||
a094cc95 MD |
73 | #define CURSIG(lp) __cursig(lp, 1, 0, NULL) |
74 | #define CURSIG_TRACE(lp) __cursig(lp, 1, 1, NULL) | |
75 | #define CURSIG_LCK_TRACE(lp, ptok) __cursig(lp, 1, 1, ptok) | |
76 | #define CURSIG_NOBLOCK(lp) __cursig(lp, 0, 0, NULL) | |
b1b4e5a6 | 77 | |
64b5a8a5 MD |
78 | /* |
79 | * This inline checks lpmap->blockallsigs, a user r/w accessible | |
80 | * memory-mapped variable that allows a user thread to instantly | |
81 | * mask and unmask all maskable signals without having to issue a | |
82 | * system call. | |
83 | * | |
84 | * On the unmask count reaching 0, userland can check and clear | |
85 | * bit 31 to determine if any signals arrived, then issue a dummy | |
86 | * system call to ensure delivery. | |
87 | */ | |
88 | static __inline | |
89 | void | |
90 | __sig_condblockallsigs(sigset_t *mask, struct lwp *lp) | |
91 | { | |
92 | struct sys_lpmap *lpmap; | |
93 | uint32_t bas; | |
94 | sigset_t tmp; | |
95 | int trapsig; | |
96 | ||
97 | if ((lpmap = lp->lwp_lpmap) == NULL) | |
98 | return; | |
99 | ||
100 | bas = lpmap->blockallsigs; | |
101 | while (bas & 0x7FFFFFFFU) { | |
102 | tmp = *mask; /* check maskable signals */ | |
103 | SIG_CANTMASK(tmp); | |
104 | if (SIGISEMPTY(tmp)) /* no unmaskable signals */ | |
105 | return; | |
106 | ||
107 | /* | |
108 | * Upon successful update to lpmap->blockallsigs remove | |
109 | * all maskable signals, leaving only unmaskable signals. | |
110 | * | |
111 | * If lwp_sig is non-zero it represents a syncronous 'trap' | |
112 | * signal which, being a synchronous trap, must be allowed. | |
113 | */ | |
114 | if (atomic_fcmpset_int(&lpmap->blockallsigs, &bas, | |
115 | bas | 0x80000000U)) { | |
116 | trapsig = lp->lwp_sig; | |
117 | if (trapsig && SIGISMEMBER(*mask, trapsig)) { | |
118 | SIGSETAND(*mask, sigcantmask_mask); | |
119 | SIGADDSET(*mask, trapsig); | |
120 | } else { | |
121 | SIGSETAND(*mask, sigcantmask_mask); | |
122 | } | |
123 | break; | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
b1b4e5a6 SS |
128 | /* |
129 | * Determine signal that should be delivered to process p, the current | |
130 | * process, 0 if none. If there is a pending stop signal with default | |
131 | * action, the process stops in issignal(). | |
132 | * | |
5686ec5a MD |
133 | * This function does not interlock pending signals. If the caller needs |
134 | * to interlock the caller must acquire the per-proc token. | |
135 | * | |
a094cc95 MD |
136 | * If ptok is non-NULL this function may return with proc->p_token held, |
137 | * indicating that the signal came from the process structure. This is | |
138 | * used by postsig to avoid holding p_token when possible. Only applicable | |
139 | * if mayblock is non-zero. | |
b1b4e5a6 SS |
140 | */ |
141 | static __inline | |
142 | int | |
a094cc95 | 143 | __cursig(struct lwp *lp, int mayblock, int maytrace, int *ptok) |
b1b4e5a6 | 144 | { |
f6e73860 | 145 | struct proc *p = lp->lwp_proc; |
b1b4e5a6 SS |
146 | sigset_t tmpset; |
147 | int r; | |
148 | ||
b1b4e5a6 SS |
149 | tmpset = lwp_sigpend(lp); |
150 | SIGSETNAND(tmpset, lp->lwp_sigmask); | |
64b5a8a5 | 151 | SIG_CONDBLOCKALLSIGS(tmpset, lp); |
b1b4e5a6 | 152 | |
f6e73860 SS |
153 | /* Nothing interesting happening? */ |
154 | if (SIGISEMPTY(tmpset)) { | |
155 | /* | |
156 | * Quit here, unless | |
157 | * a) we may block and | |
158 | * b) somebody is tracing us. | |
159 | */ | |
64b5a8a5 | 160 | if (mayblock == 0 || (p->p_flags & P_TRACED) == 0) |
f6e73860 SS |
161 | return (0); |
162 | } | |
b1b4e5a6 | 163 | |
f6e73860 | 164 | if (mayblock) |
a094cc95 | 165 | r = issignal(lp, maytrace, ptok); |
f6e73860 SS |
166 | else |
167 | r = TRUE; /* simply state the fact */ | |
168 | ||
169 | return(r); | |
b1b4e5a6 SS |
170 | } |
171 | ||
c0b79d00 | 172 | #endif /* !_SYS_SIGNAL2_H_ */ |