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a09e091a JB |
1 | /** |
2 | * Copyright © 2012 Red Hat, Inc. | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
21 | * DEALINGS IN THE SOFTWARE. | |
22 | */ | |
23 | ||
24 | #ifdef HAVE_DIX_CONFIG_H | |
25 | #include <dix-config.h> | |
26 | #endif | |
27 | ||
28 | #include <signal.h> | |
29 | #include "os.h" | |
30 | ||
31 | static int last_signal = 0; | |
32 | static int expect_signal = 0; | |
33 | ||
34 | static void sighandler(int signal) | |
35 | { | |
36 | assert(expect_signal); | |
37 | expect_signal = 0; | |
38 | if (!last_signal) | |
39 | raise(signal); | |
40 | OsBlockSignals(); | |
41 | OsReleaseSignals(); | |
42 | last_signal = 1; | |
43 | expect_signal = 1; | |
44 | } | |
45 | ||
46 | static int | |
47 | sig_is_blocked(int sig) | |
48 | { | |
49 | sigset_t current; | |
50 | ||
51 | sigemptyset(¤t); | |
52 | assert(sigprocmask(SIG_BLOCK, NULL, ¤t) == 0); | |
53 | return sigismember(¤t, sig); | |
54 | } | |
55 | ||
56 | static void block_sigio_test(void) | |
57 | { | |
58 | #ifdef SIG_BLOCK | |
59 | sigset_t current; | |
60 | ||
61 | sigemptyset(¤t); | |
62 | assert(!sig_is_blocked(SIGIO)); | |
63 | ||
64 | /* block once */ | |
65 | OsBlockSIGIO(); | |
66 | assert(sig_is_blocked(SIGIO)); | |
67 | OsReleaseSIGIO(); | |
68 | assert(!sig_is_blocked(SIGIO)); | |
69 | ||
70 | /* block twice, nested */ | |
71 | OsBlockSIGIO(); | |
72 | assert(sig_is_blocked(SIGIO)); | |
73 | OsBlockSIGIO(); | |
74 | assert(sig_is_blocked(SIGIO)); | |
75 | OsReleaseSIGIO(); | |
76 | assert(sig_is_blocked(SIGIO)); | |
77 | OsReleaseSIGIO(); | |
78 | assert(!sig_is_blocked(SIGIO)); | |
79 | ||
80 | /* block all */ | |
81 | OsBlockSignals(); | |
82 | assert(sig_is_blocked(SIGIO)); | |
83 | OsReleaseSignals(); | |
84 | assert(!sig_is_blocked(SIGIO)); | |
85 | ||
86 | /* block all nested */ | |
87 | OsBlockSignals(); | |
88 | assert(sig_is_blocked(SIGIO)); | |
89 | OsBlockSignals(); | |
90 | assert(sig_is_blocked(SIGIO)); | |
91 | OsReleaseSignals(); | |
92 | assert(sig_is_blocked(SIGIO)); | |
93 | OsReleaseSignals(); | |
94 | assert(!sig_is_blocked(SIGIO)); | |
95 | ||
96 | /* mix the two */ | |
97 | /* ABBA */ | |
98 | OsBlockSignals(); | |
99 | assert(sig_is_blocked(SIGIO)); | |
100 | OsBlockSIGIO(); | |
101 | assert(sig_is_blocked(SIGIO)); | |
102 | OsReleaseSIGIO(); | |
103 | assert(sig_is_blocked(SIGIO)); | |
104 | OsReleaseSignals(); | |
105 | assert(!sig_is_blocked(SIGIO)); | |
106 | ||
107 | /* ABAB */ | |
108 | OsBlockSignals(); | |
109 | assert(sig_is_blocked(SIGIO)); | |
110 | OsBlockSIGIO(); | |
111 | assert(sig_is_blocked(SIGIO)); | |
112 | OsReleaseSignals(); | |
113 | assert(sig_is_blocked(SIGIO)); | |
114 | OsReleaseSIGIO(); | |
115 | assert(!sig_is_blocked(SIGIO)); | |
116 | ||
117 | /* BAAB */ | |
118 | OsBlockSIGIO(); | |
119 | assert(sig_is_blocked(SIGIO)); | |
120 | OsBlockSignals(); | |
121 | assert(sig_is_blocked(SIGIO)); | |
122 | OsReleaseSignals(); | |
123 | assert(sig_is_blocked(SIGIO)); | |
124 | OsReleaseSIGIO(); | |
125 | assert(!sig_is_blocked(SIGIO)); | |
126 | ||
127 | /* BABA */ | |
128 | OsBlockSIGIO(); | |
129 | assert(sig_is_blocked(SIGIO)); | |
130 | OsBlockSignals(); | |
131 | assert(sig_is_blocked(SIGIO)); | |
132 | OsReleaseSIGIO(); | |
133 | assert(sig_is_blocked(SIGIO)); | |
134 | OsReleaseSignals(); | |
135 | assert(!sig_is_blocked(SIGIO)); | |
136 | #endif | |
137 | } | |
138 | ||
139 | static void block_sigio_test_nested(void) | |
140 | { | |
141 | #ifdef SIG_BLOCK | |
142 | /* Check for bug releasing SIGIO during SIGIO signal handling. | |
143 | test case: | |
144 | raise signal | |
145 | → in signal handler: | |
146 | raise signal | |
147 | OsBlockSignals() | |
148 | OsReleaseSignals() | |
149 | tail guard | |
150 | tail guard must be hit. | |
151 | */ | |
152 | void (*old_handler)(int); | |
153 | old_handler = signal(SIGIO, sighandler); | |
154 | expect_signal = 1; | |
155 | assert(raise(SIGIO) == 0); | |
156 | assert(signal(SIGIO, old_handler) == sighandler); | |
157 | #endif | |
158 | } | |
159 | ||
160 | int | |
161 | main(int argc, char **argv) | |
162 | { | |
163 | block_sigio_test(); | |
164 | block_sigio_test_nested(); | |
165 | return 0; | |
166 | } |