2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
29 * Based on test by Dr. David Alan Gilbert <dave@treblig.org>
37 #include <sys/select.h>
38 #include <sys/syscall.h>
44 # warning NSIG is not defined, using 32
48 static fd_set set[3][0x1000000 / sizeof(fd_set)];
55 int main(int ac, char **av)
62 .ts = { .tv_sec = 0xc0de1, .tv_nsec = 0xc0de2 },
63 .pad = { 0xdeadbeef, 0xbadc0ded }
66 const struct sigaction act = { .sa_handler = handler };
67 const struct itimerval itv = { .it_value.tv_usec = 111111 };
70 sigaddset(&mask, SIGHUP);
71 sigaddset(&mask, SIGCHLD);
74 perror_msg_and_fail("pipe");
77 * Start with a nice simple pselect.
79 FD_SET(fds[0], set[0]);
80 FD_SET(fds[1], set[0]);
81 FD_SET(fds[0], set[1]);
82 FD_SET(fds[1], set[1]);
85 int rc = pselect(fds[1] + 1, set[0], set[1], set[2], NULL, NULL);
87 perror_msg_and_skip("pselect");
89 printf("pselect6(%d, [%d %d], [%d %d], [1 2], NULL, {NULL, %u}) "
91 fds[1] + 1, fds[0], fds[1],
96 * Another simple one, with a timeout.
100 FD_SET(fds[0], set[1]);
101 FD_SET(fds[1], set[1]);
102 assert(syscall(__NR_pselect6, fds[1] + 1, NULL, set[1], NULL, &tm.ts, NULL) == 3);
103 printf("pselect6(%d, NULL, [1 2 %d %d], NULL, {%lld, %lld}, NULL)"
104 " = 3 (out [1 2 %d], left {%lld, %lld})\n",
105 fds[1] + 1, fds[0], fds[1],
106 (long long) tm_in.ts.tv_sec, (long long) tm_in.ts.tv_nsec,
108 (long long) tm.ts.tv_sec, (long long) tm.ts.tv_nsec);
111 * Now the crash case that trinity found, negative nfds
112 * but with a pointer to a large chunk of valid memory.
115 FD_SET(fds[1],set[0]);
116 assert(pselect(-1, NULL, set[0], NULL, NULL, &mask) == -1);
117 printf("pselect6(-1, NULL, %p, NULL, NULL, {[HUP CHLD], %u}) "
118 "= -1 EINVAL (%m)\n", set[0], NSIG / 8);
121 * Another variant, with nfds exceeding FD_SETSIZE limit.
124 FD_SET(fds[0],set[0]);
128 assert(pselect(FD_SETSIZE + 1, set[0], set[1], NULL, &tm.ts, &mask) == 0);
129 printf("pselect6(%d, [%d], [], NULL, {0, 123}, {[HUP CHLD], %u}) "
130 "= 0 (Timeout)\n", FD_SETSIZE + 1, fds[0], NSIG / 8);
133 * See how timeouts are decoded.
135 assert(sigaction(SIGALRM, &act, NULL) == 0);
136 assert(setitimer(ITIMER_REAL, &itv, NULL) == 0);
138 tm.ts.tv_nsec = 222222222;
139 assert(pselect(0, NULL, NULL, NULL, &tm.ts, &mask) == -1);
140 printf("pselect6(0, NULL, NULL, NULL, {0, 222222222}, {[HUP CHLD], %u})"
141 " = ? ERESTARTNOHAND (To be restarted if no handler)\n",
143 puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");
145 puts("+++ exited with 0 +++");
151 SKIP_MAIN_UNDEFINED("__NR_pselect6")