strace/tests/pselect6.c

/*
 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
 * Copyright (c) 2015-2017 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

/*
 * Based on test by Dr. David Alan Gilbert <dave@treblig.org>
 */

#include "tests.h"
#include "nsig.h"
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <asm/unistd.h>
#include <sys/time.h>

#ifdef __NR_pselect6

static fd_set set[3][0x1000000 / sizeof(fd_set)];

static void
handler(int signo)
{
}

int main(int ac, char **av)
{
	int fds[2];
	struct {
		struct timespec ts;
		int pad[2];
	} tm_in = {
		.ts = { .tv_sec = 0xc0de1, .tv_nsec = 0xc0de2 },
		.pad = { 0xdeadbeef, 0xbadc0ded }
	}, tm = tm_in;
	sigset_t mask;
	const struct sigaction act = { .sa_handler = handler };
	const struct itimerval itv = { .it_value.tv_usec = 111111 };

	sigemptyset(&mask);
	sigaddset(&mask, SIGHUP);
	sigaddset(&mask, SIGCHLD);

	if (pipe(fds))
		perror_msg_and_fail("pipe");

	/*
	 * Start with a nice simple pselect.
	 */
	FD_SET(fds[0], set[0]);
	FD_SET(fds[1], set[0]);
	FD_SET(fds[0], set[1]);
	FD_SET(fds[1], set[1]);
	FD_SET(1, set[2]);
	FD_SET(2, set[2]);
	int rc = pselect(fds[1] + 1, set[0], set[1], set[2], NULL, NULL);
	if (rc < 0)
		perror_msg_and_skip("pselect");
	assert(rc == 1);
	printf("pselect6(%d, [%d %d], [%d %d], [1 2], NULL, {NULL, %u}) "
	       "= 1 (out [%d])\n",
	       fds[1] + 1, fds[0], fds[1],
	       fds[0], fds[1],
	       NSIG_BYTES, fds[1]);

	/*
	 * Another simple one, with a timeout.
	 */
	FD_SET(1, set[1]);
	FD_SET(2, set[1]);
	FD_SET(fds[0], set[1]);
	FD_SET(fds[1], set[1]);
	assert(syscall(__NR_pselect6, fds[1] + 1, NULL, set[1], NULL, &tm.ts, NULL) == 3);
	printf("pselect6(%d, NULL, [1 2 %d %d], NULL"
	       ", {tv_sec=%lld, tv_nsec=%llu}, NULL) = 3 (out [1 2 %d]"
	       ", left {tv_sec=%lld, tv_nsec=%llu})\n",
	       fds[1] + 1, fds[0], fds[1], (long long) tm_in.ts.tv_sec,
	       zero_extend_signed_to_ull(tm_in.ts.tv_nsec),
	       fds[1], (long long) tm.ts.tv_sec,
	       zero_extend_signed_to_ull(tm.ts.tv_nsec));

	/*
	 * Now the crash case that trinity found, negative nfds
	 * but with a pointer to a large chunk of valid memory.
	 */
	FD_ZERO(set[0]);
	FD_SET(fds[1], set[0]);
	assert(pselect(-1, NULL, set[0], NULL, NULL, &mask) == -1);
	printf("pselect6(-1, NULL, %p, NULL, NULL, {[HUP CHLD], %u}) "
	       "= -1 EINVAL (%m)\n", set[0], NSIG_BYTES);

	/*
	 * Another variant, with nfds exceeding FD_SETSIZE limit.
	 */
	FD_ZERO(set[0]);
	FD_SET(fds[0], set[0]);
	FD_ZERO(set[1]);
	tm.ts.tv_sec = 0;
	tm.ts.tv_nsec = 123;
	assert(pselect(FD_SETSIZE + 1, set[0], set[1], NULL, &tm.ts, &mask) == 0);
	printf("pselect6(%d, [%d], [], NULL, {tv_sec=0, tv_nsec=123}"
	       ", {[HUP CHLD], %u}) = 0 (Timeout)\n",
	       FD_SETSIZE + 1, fds[0], NSIG_BYTES);

	/*
	 * See how timeouts are decoded.
	 */
	tm.ts.tv_sec = 0xdeadbeefU;
	tm.ts.tv_nsec = 0xfacefeedU;
	assert(pselect(0, NULL, NULL, NULL, &tm.ts, NULL) == -1);
	printf("pselect6(0, NULL, NULL, NULL"
	       ", {tv_sec=%lld, tv_nsec=%llu}, {NULL, %u}) = %s\n",
	       (long long) tm.ts.tv_sec,
	       zero_extend_signed_to_ull(tm.ts.tv_nsec),
	       NSIG_BYTES, sprintrc(-1));

	tm.ts.tv_sec = (time_t) 0xcafef00ddeadbeefLL;
	tm.ts.tv_nsec = (long) 0xbadc0dedfacefeedLL;
	assert(pselect(0, NULL, NULL, NULL, &tm.ts, NULL) == -1);
	printf("pselect6(0, NULL, NULL, NULL"
	       ", {tv_sec=%lld, tv_nsec=%llu}, {NULL, %u}) = %s\n",
	       (long long) tm.ts.tv_sec,
	       zero_extend_signed_to_ull(tm.ts.tv_nsec),
	       NSIG_BYTES, sprintrc(-1));

	assert(sigaction(SIGALRM, &act, NULL) == 0);
	assert(setitimer(ITIMER_REAL, &itv, NULL) == 0);

	tm.ts.tv_sec = 0;
	tm.ts.tv_nsec = 222222222;
	assert(pselect(0, NULL, NULL, NULL, &tm.ts, &mask) == -1);
	printf("pselect6(0, NULL, NULL, NULL, {tv_sec=0, tv_nsec=222222222}"
	       ", {[HUP CHLD], %u})"
	       " = ? ERESTARTNOHAND (To be restarted if no handler)\n",
	       NSIG_BYTES);
	puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");

	puts("+++ exited with 0 +++");
	return 0;
}

#else

SKIP_MAIN_UNDEFINED("__NR_pselect6")

#endif