1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * 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. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * Based on test by Dr. David Alan Gilbert <dave@treblig.org>
30 */
31 #include <stdio.h>
32 #include <signal.h>
33 #include <unistd.h>
34 #include <sys/select.h>
35 #include <sys/syscall.h>
36 #include <sys/time.h>
37
38 #ifdef __NR_pselect6
39
40 #ifndef NSIG
41 # warning NSIG is not defined, using 32
42 # define NSIG 32
43 #endif
44
45 static fd_set set[3][0x1000000 / sizeof(fd_set)];
46
47 static void
handler(int signo)48 handler(int signo)
49 {
50 }
51
main(int ac,char ** av)52 int main(int ac, char **av)
53 {
54 int fds[2];
55 struct {
56 struct timespec ts;
57 int pad[2];
58 } tm_in = {
59 .ts = { .tv_sec = 0xc0de1, .tv_nsec = 0xc0de2 },
60 .pad = { 0xdeadbeef, 0xbadc0ded }
61 }, tm = tm_in;
62 sigset_t mask;
63 const struct sigaction act = { .sa_handler = handler };
64 const struct itimerval itv = { .it_value.tv_usec = 111111 };
65
66 sigemptyset(&mask);
67 sigaddset(&mask, SIGHUP);
68 sigaddset(&mask, SIGCHLD);
69
70 if (pipe(fds))
71 return 77;
72
73 /*
74 * Start with a nice simple pselect.
75 */
76 FD_SET(fds[0], set[0]);
77 FD_SET(fds[1], set[0]);
78 FD_SET(fds[0], set[1]);
79 FD_SET(fds[1], set[1]);
80 FD_SET(1, set[2]);
81 FD_SET(2, set[2]);
82 if (pselect(fds[1] + 1, set[0], set[1], set[2], NULL, NULL) != 1)
83 return 77;
84 printf("pselect6(%d, [%d %d], [%d %d], [1 2], NULL, {NULL, %u}) "
85 "= 1 (out [%d])\n",
86 fds[1] + 1, fds[0], fds[1],
87 fds[0], fds[1],
88 NSIG / 8, fds[1]);
89
90 /*
91 * Another simple one, with a timeout.
92 */
93 FD_SET(1, set[1]);
94 FD_SET(2, set[1]);
95 FD_SET(fds[0], set[1]);
96 FD_SET(fds[1], set[1]);
97 if (syscall(__NR_pselect6, fds[1] + 1, NULL, set[1], NULL, &tm.ts, NULL) != 3)
98 return 77;
99 printf("pselect6(%d, NULL, [1 2 %d %d], NULL, {%lld, %lld}, NULL)"
100 " = 3 (out [1 2 %d], left {%lld, %lld})\n",
101 fds[1] + 1, fds[0], fds[1],
102 (long long) tm_in.ts.tv_sec, (long long) tm_in.ts.tv_nsec,
103 fds[1],
104 (long long) tm.ts.tv_sec, (long long) tm.ts.tv_nsec);
105
106 /*
107 * Now the crash case that trinity found, negative nfds
108 * but with a pointer to a large chunk of valid memory.
109 */
110 FD_ZERO(set[0]);
111 FD_SET(fds[1],set[0]);
112 if (pselect(-1, NULL, set[0], NULL, NULL, &mask) != -1)
113 return 77;
114 printf("pselect6(-1, NULL, %p, NULL, NULL, {[HUP CHLD], %u}) "
115 "= -1 EINVAL (Invalid argument)\n", set[0], NSIG / 8);
116
117 /*
118 * Another variant, with nfds exceeding FD_SETSIZE limit.
119 */
120 FD_ZERO(set[0]);
121 FD_SET(fds[0],set[0]);
122 FD_ZERO(set[1]);
123 tm.ts.tv_sec = 0;
124 tm.ts.tv_nsec = 123;
125 if (pselect(FD_SETSIZE + 1, set[0], set[1], NULL, &tm.ts, &mask) != 0)
126 return 77;
127 printf("pselect6(%d, [%d], [], NULL, {0, 123}, {[HUP CHLD], %u}) "
128 "= 0 (Timeout)\n", FD_SETSIZE + 1, fds[0], NSIG / 8);
129
130 /*
131 * See how timeouts are decoded.
132 */
133 if (sigaction(SIGALRM, &act, NULL) != 0)
134 return 77;
135 if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
136 return 77;
137
138 tm.ts.tv_nsec = 222222222;
139 if (pselect(0, NULL, NULL, NULL, &tm.ts, &mask) != -1)
140 return 77;
141 puts("pselect6(0, NULL, NULL, NULL, {0, 222222222}, {[HUP CHLD], 8})"
142 " = ? ERESTARTNOHAND (To be restarted if no handler)");
143 puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");
144
145 puts("+++ exited with 0 +++");
146 return 0;
147 }
148
149 #else
150
151 int
main(void)152 main(void)
153 {
154 return 77;
155 }
156
157 #endif
158