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7e28f203 L |
1 | /* Testcase checks, if setcontext(), swapcontext() restores signal-mask |
2 | and if pending signals are delivered after those calls. | |
6d7e8eda | 3 | Copyright (C) 2018-2023 Free Software Foundation, Inc. |
7e28f203 L |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
7e28f203 L |
19 | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <sys/types.h> | |
23 | #include <signal.h> | |
24 | #include <ucontext.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | volatile int global; | |
28 | volatile sig_atomic_t handlerCalled; | |
29 | ||
30 | static void | |
31 | check (const char *funcName) | |
32 | { | |
33 | sigset_t set; | |
34 | ||
35 | /* check if SIGUSR2 is unblocked after setcontext-call. */ | |
36 | sigprocmask (SIG_BLOCK, NULL, &set); | |
37 | ||
38 | if (sigismember (&set, SIGUSR2) != 0) | |
39 | { | |
40 | printf ("FAIL: SIGUSR2 is blocked after %s.\n", funcName); | |
41 | exit (1); | |
42 | } | |
43 | ||
44 | if (sigismember (&set, SIGUSR1) != 1) | |
45 | { | |
46 | printf ("FAIL: SIGUSR1 is not blocked after %s.\n", funcName); | |
47 | exit (1); | |
48 | } | |
49 | } | |
50 | ||
51 | static void | |
52 | signalmask (int how, int signum) | |
53 | { | |
54 | sigset_t set; | |
55 | sigemptyset (&set); | |
56 | sigaddset (&set, signum); | |
57 | if (sigprocmask (how, &set, NULL) != 0) | |
58 | { | |
59 | printf ("FAIL: sigprocmaks (%d, %d, NULL): %m\n", how, signum); | |
60 | exit (1); | |
61 | } | |
62 | } | |
63 | ||
64 | static void | |
65 | signalpending (int signum, const char *msg) | |
66 | { | |
67 | sigset_t set; | |
68 | sigemptyset (&set); | |
69 | if (sigpending (&set) != 0) | |
70 | { | |
71 | printf ("FAIL: sigpending: %m\n"); | |
72 | exit (1); | |
73 | } | |
74 | if (sigismember (&set, SIGUSR2) != 1) | |
75 | { | |
76 | printf ("FAIL: Signal %d is not pending %s\n", signum, msg); | |
77 | exit (1); | |
78 | } | |
79 | } | |
80 | ||
81 | static void | |
82 | handler (int __attribute__ ((unused)) signum) | |
83 | { | |
84 | handlerCalled ++; | |
85 | } | |
86 | ||
87 | static int | |
88 | do_test (void) | |
89 | { | |
90 | ucontext_t ctx, oldctx; | |
91 | struct sigaction action; | |
92 | pid_t pid; | |
93 | ||
94 | pid = getpid (); | |
95 | ||
96 | /* unblock SIGUSR2 */ | |
97 | signalmask (SIG_UNBLOCK, SIGUSR2); | |
98 | ||
99 | /* block SIGUSR1 */ | |
100 | signalmask (SIG_BLOCK, SIGUSR1); | |
101 | ||
102 | /* register handler for SIGUSR2 */ | |
103 | action.sa_flags = 0; | |
104 | action.sa_handler = handler; | |
105 | sigemptyset (&action.sa_mask); | |
106 | sigaction (SIGUSR2, &action, NULL); | |
107 | ||
108 | if (getcontext (&ctx) != 0) | |
109 | { | |
110 | printf ("FAIL: getcontext: %m\n"); | |
111 | exit (1); | |
112 | } | |
113 | ||
114 | global++; | |
115 | ||
116 | if (global == 1) | |
117 | { | |
118 | puts ("after getcontext"); | |
119 | ||
120 | /* block SIGUSR2 */ | |
121 | signalmask (SIG_BLOCK, SIGUSR2); | |
122 | ||
123 | /* send SIGUSR2 to me */ | |
124 | handlerCalled = 0; | |
125 | kill (pid, SIGUSR2); | |
126 | ||
127 | /* was SIGUSR2 handler called? */ | |
128 | if (handlerCalled != 0) | |
129 | { | |
130 | puts ("FAIL: signal handler was called, but signal was blocked."); | |
131 | exit (1); | |
132 | } | |
133 | ||
134 | /* is SIGUSR2 pending? */ | |
135 | signalpending (SIGUSR2, "before setcontext"); | |
136 | ||
137 | /* SIGUSR2 will be unblocked by setcontext-call. */ | |
138 | if (setcontext (&ctx) != 0) | |
139 | { | |
140 | printf ("FAIL: setcontext: %m\n"); | |
141 | exit (1); | |
142 | } | |
143 | } | |
144 | else if (global == 2) | |
145 | { | |
146 | puts ("after setcontext"); | |
147 | ||
148 | /* check SIGUSR1/2 */ | |
149 | check ("setcontext"); | |
150 | ||
151 | /* was SIGUSR2 handler called? */ | |
152 | if (handlerCalled != 1) | |
153 | { | |
154 | puts ("FAIL: signal handler was not called after setcontext."); | |
155 | exit (1); | |
156 | } | |
157 | ||
158 | /* block SIGUSR2 */ | |
159 | signalmask (SIG_BLOCK, SIGUSR2); | |
160 | ||
161 | /* send SIGUSR2 to me */ | |
162 | handlerCalled = 0; | |
163 | kill (pid, SIGUSR2); | |
164 | ||
165 | /* was SIGUSR2 handler called? */ | |
166 | if (handlerCalled != 0) | |
167 | { | |
168 | puts ("FAIL: signal handler was called, but signal was blocked."); | |
169 | exit (1); | |
170 | } | |
171 | ||
172 | /* is SIGUSR2 pending? */ | |
173 | signalpending (SIGUSR2, "before swapcontext"); | |
174 | ||
175 | if (swapcontext (&oldctx, &ctx) != 0) | |
176 | { | |
177 | printf ("FAIL: swapcontext: %m\n"); | |
178 | exit (1); | |
179 | } | |
180 | ||
181 | puts ("FAIL: returned from (&oldctx, &ctx)"); | |
182 | exit (1); | |
183 | } | |
184 | else if ( global != 3 ) | |
185 | { | |
186 | puts ("FAIL: 'global' not incremented three times"); | |
187 | exit (1); | |
188 | } | |
189 | ||
190 | puts ("after swapcontext"); | |
191 | /* check SIGUSR1/2 */ | |
192 | check ("swapcontext"); | |
193 | ||
194 | /* was SIGUSR2 handler called? */ | |
195 | if (handlerCalled != 1) | |
196 | { | |
197 | puts ("FAIL: signal handler was not called after swapcontext."); | |
198 | exit (1); | |
199 | } | |
200 | ||
201 | /* check sigmask in old context of swapcontext-call */ | |
202 | if (sigismember (&oldctx.uc_sigmask, SIGUSR2) != 1) | |
203 | { | |
204 | puts ("FAIL: SIGUSR2 is not blocked in oldctx.uc_sigmask."); | |
205 | exit (1); | |
206 | } | |
207 | ||
208 | if (sigismember (&oldctx.uc_sigmask, SIGUSR1) != 1) | |
209 | { | |
210 | puts ("FAIL: SIGUSR1 is not blocked in oldctx.uc_sigmaks."); | |
211 | exit (1); | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | #include <support/test-driver.c> |