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freebsd-dev/tests/sys/kern/pipe/pipe_kqueue_test.c
Mark Johnston 9bf12bb91d Avoid hard-coding pipe buffer sizes in the pipe and fifo kqueue tests. 
Fix some style issues in the modified tests while here.

Reported by:	Jenkins via lwhsu
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2020-05-20 17:48:18 +00:00

368 lines
10 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Jan Kokemüller
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <atf-c.h>
ATF_TC_WITHOUT_HEAD(pipe_kqueue__write_end);
ATF_TC_BODY(pipe_kqueue__write_end, tc)
{
int p[2] = { -1, -1 };
ATF_REQUIRE(pipe2(p, O_CLOEXEC | O_NONBLOCK) == 0);
ATF_REQUIRE(p[0] >= 0);
ATF_REQUIRE(p[1] >= 0);
int kq = kqueue();
ATF_REQUIRE(kq >= 0);
struct kevent kev[32];
EV_SET(&kev[0], p[1], EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0);
ATF_REQUIRE(kevent(kq, kev, 1, NULL, 0, NULL) == 0);
/* Test that EVFILT_WRITE behaves sensibly on the write end. */
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags == EV_CLEAR);
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == 16384);
ATF_REQUIRE(kev[0].udata == 0);
/* Filling up the pipe should make the EVFILT_WRITE disappear. */
char c = 0;
ssize_t r;
while ((r = write(p[1], &c, 1)) == 1) {
}
ATF_REQUIRE(r < 0);
ATF_REQUIRE(errno == EAGAIN || errno == EWOULDBLOCK);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 0);
/* Reading (PIPE_BUF - 1) bytes will not trigger a EVFILT_WRITE yet. */
for (int i = 0; i < PIPE_BUF - 1; ++i) {
ATF_REQUIRE(read(p[0], &c, 1) == 1);
}
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 0);
/* Reading one additional byte triggers the EVFILT_WRITE. */
ATF_REQUIRE(read(p[0], &c, 1) == 1);
r = kevent(kq, NULL, 0, kev, nitems(kev), &(struct timespec) { 0, 0 });
ATF_REQUIRE(r == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags == EV_CLEAR);
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == PIPE_BUF);
ATF_REQUIRE(kev[0].udata == 0);
/*
* Reading another byte triggers the EVFILT_WRITE again with a changed
* 'data' field.
*/
ATF_REQUIRE(read(p[0], &c, 1) == 1);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags == EV_CLEAR);
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == PIPE_BUF + 1);
ATF_REQUIRE(kev[0].udata == 0);
/*
* Closing the read end should make a EV_EOF appear but leave the 'data'
* field unchanged.
*/
ATF_REQUIRE(close(p[0]) == 0);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags == (EV_CLEAR | EV_EOF | EV_ONESHOT));
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == PIPE_BUF + 1);
ATF_REQUIRE(kev[0].udata == 0);
ATF_REQUIRE(close(kq) == 0);
ATF_REQUIRE(close(p[1]) == 0);
}
ATF_TC_WITHOUT_HEAD(pipe_kqueue__closed_read_end);
ATF_TC_BODY(pipe_kqueue__closed_read_end, tc)
{
int p[2] = { -1, -1 };
ATF_REQUIRE(pipe2(p, O_CLOEXEC | O_NONBLOCK) == 0);
ATF_REQUIRE(p[0] >= 0);
ATF_REQUIRE(p[1] >= 0);
ATF_REQUIRE(close(p[0]) == 0);
int kq = kqueue();
ATF_REQUIRE(kq >= 0);
struct kevent kev[32];
EV_SET(&kev[0], p[1], EVFILT_READ, EV_ADD | EV_CLEAR | EV_RECEIPT, /**/
0, 0, 0);
EV_SET(&kev[1], p[1], EVFILT_WRITE, EV_ADD | EV_CLEAR | EV_RECEIPT, /**/
0, 0, 0);
/*
* Trying to register EVFILT_WRITE when the pipe is closed leads to an
* EPIPE error.
*/
ATF_REQUIRE(kevent(kq, kev, 2, kev, 2, NULL) == 2);
ATF_REQUIRE((kev[0].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[0].data == 0);
ATF_REQUIRE((kev[1].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[1].data == EPIPE);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_READ);
ATF_REQUIRE(kev[0].flags == (EV_EOF | EV_CLEAR | EV_RECEIPT));
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == 0);
ATF_REQUIRE(kev[0].udata == 0);
ATF_REQUIRE(close(kq) == 0);
ATF_REQUIRE(close(p[1]) == 0);
}
ATF_TC_WITHOUT_HEAD(pipe_kqueue__closed_read_end_register_before_close);
ATF_TC_BODY(pipe_kqueue__closed_read_end_register_before_close, tc)
{
int p[2] = { -1, -1 };
ATF_REQUIRE(pipe2(p, O_CLOEXEC | O_NONBLOCK) == 0);
ATF_REQUIRE(p[0] >= 0);
ATF_REQUIRE(p[1] >= 0);
int kq = kqueue();
ATF_REQUIRE(kq >= 0);
struct kevent kev[32];
EV_SET(&kev[0], p[1], EVFILT_READ, EV_ADD | EV_CLEAR | EV_RECEIPT, /**/
0, 0, 0);
EV_SET(&kev[1], p[1], EVFILT_WRITE, EV_ADD | EV_CLEAR | EV_RECEIPT, /**/
0, 0, 0);
/*
* Registering EVFILT_WRITE before the pipe is closed leads to a
* EVFILT_WRITE event with EV_EOF set.
*/
ATF_REQUIRE(kevent(kq, kev, 2, kev, 2, NULL) == 2);
ATF_REQUIRE((kev[0].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[0].data == 0);
ATF_REQUIRE((kev[1].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[1].data == 0);
ATF_REQUIRE(close(p[0]) == 0);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 2);
{
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags ==
(EV_EOF | EV_CLEAR | EV_ONESHOT | EV_RECEIPT));
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == 16384);
ATF_REQUIRE(kev[0].udata == 0);
}
{
ATF_REQUIRE(kev[1].ident == (uintptr_t)p[1]);
ATF_REQUIRE(kev[1].filter == EVFILT_READ);
ATF_REQUIRE(kev[1].flags == (EV_EOF | EV_CLEAR | EV_RECEIPT));
ATF_REQUIRE(kev[1].fflags == 0);
ATF_REQUIRE(kev[1].data == 0);
ATF_REQUIRE(kev[1].udata == 0);
}
ATF_REQUIRE(close(kq) == 0);
ATF_REQUIRE(close(p[1]) == 0);
}
ATF_TC_WITHOUT_HEAD(pipe_kqueue__closed_write_end);
ATF_TC_BODY(pipe_kqueue__closed_write_end, tc)
{
struct kevent kev[32];
ssize_t bytes, n;
int kq, p[2];
char c;
ATF_REQUIRE(pipe2(p, O_CLOEXEC | O_NONBLOCK) == 0);
ATF_REQUIRE(p[0] >= 0);
ATF_REQUIRE(p[1] >= 0);
bytes = 0;
c = 0;
while ((n = write(p[1], &c, 1)) == 1)
bytes++;
ATF_REQUIRE(n < 0);
ATF_REQUIRE(errno == EAGAIN || errno == EWOULDBLOCK);
ATF_REQUIRE(close(p[1]) == 0);
kq = kqueue();
ATF_REQUIRE(kq >= 0);
EV_SET(&kev[0], p[0], EVFILT_READ, EV_ADD | EV_CLEAR | EV_RECEIPT,
0, 0, 0);
EV_SET(&kev[1], p[0], EVFILT_WRITE, EV_ADD | EV_CLEAR | EV_RECEIPT,
0, 0, 0);
/*
* Trying to register EVFILT_WRITE when the pipe is closed leads to an
* EPIPE error.
*/
ATF_REQUIRE(kevent(kq, kev, 2, kev, 2, NULL) == 2);
ATF_REQUIRE((kev[0].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[0].data == 0);
ATF_REQUIRE((kev[1].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[1].data == EPIPE);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec) { 0, 0 }) == 1);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[0]);
ATF_REQUIRE(kev[0].filter == EVFILT_READ);
ATF_REQUIRE(kev[0].flags == (EV_EOF | EV_CLEAR | EV_RECEIPT));
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data == bytes);
ATF_REQUIRE(kev[0].udata == 0);
ATF_REQUIRE(close(kq) == 0);
ATF_REQUIRE(close(p[0]) == 0);
}
ATF_TC_WITHOUT_HEAD(pipe_kqueue__closed_write_end_register_before_close);
ATF_TC_BODY(pipe_kqueue__closed_write_end_register_before_close, tc)
{
struct kevent kev[32];
ssize_t bytes, n;
int kq, p[2];
char c;
ATF_REQUIRE(pipe2(p, O_CLOEXEC | O_NONBLOCK) == 0);
ATF_REQUIRE(p[0] >= 0);
ATF_REQUIRE(p[1] >= 0);
kq = kqueue();
ATF_REQUIRE(kq >= 0);
EV_SET(&kev[0], p[0], EVFILT_READ, EV_ADD | EV_CLEAR | EV_RECEIPT,
0, 0, 0);
EV_SET(&kev[1], p[0], EVFILT_WRITE, EV_ADD | EV_CLEAR | EV_RECEIPT,
0, 0, 0);
/*
* Registering EVFILT_WRITE before the pipe is closed leads to a
* EVFILT_WRITE event with EV_EOF set.
*/
ATF_REQUIRE(kevent(kq, kev, 2, kev, 2, NULL) == 2);
ATF_REQUIRE((kev[0].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[0].data == 0);
ATF_REQUIRE((kev[1].flags & EV_ERROR) != 0);
ATF_REQUIRE(kev[1].data == 0);
bytes = 0;
c = 0;
while ((n = write(p[1], &c, 1)) == 1)
bytes++;
ATF_REQUIRE(n < 0);
ATF_REQUIRE(errno == EAGAIN || errno == EWOULDBLOCK);
ATF_REQUIRE(close(p[1]) == 0);
ATF_REQUIRE(kevent(kq, NULL, 0, kev, nitems(kev),
&(struct timespec){ 0, 0 }) == 2);
ATF_REQUIRE(kev[0].ident == (uintptr_t)p[0]);
ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
ATF_REQUIRE(kev[0].flags ==
(EV_EOF | EV_CLEAR | EV_ONESHOT | EV_RECEIPT));
ATF_REQUIRE(kev[0].fflags == 0);
ATF_REQUIRE(kev[0].data > 0);
ATF_REQUIRE(kev[0].udata == 0);
ATF_REQUIRE(kev[1].ident == (uintptr_t)p[0]);
ATF_REQUIRE(kev[1].filter == EVFILT_READ);
ATF_REQUIRE(kev[1].flags == (EV_EOF | EV_CLEAR | EV_RECEIPT));
ATF_REQUIRE(kev[1].fflags == 0);
ATF_REQUIRE(kev[1].data == bytes);
ATF_REQUIRE(kev[1].udata == 0);
ATF_REQUIRE(close(kq) == 0);
ATF_REQUIRE(close(p[0]) == 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, pipe_kqueue__write_end);
ATF_TP_ADD_TC(tp, pipe_kqueue__closed_read_end);
ATF_TP_ADD_TC(tp, pipe_kqueue__closed_read_end_register_before_close);
ATF_TP_ADD_TC(tp, pipe_kqueue__closed_write_end);
ATF_TP_ADD_TC(tp, pipe_kqueue__closed_write_end_register_before_close);
return atf_no_error();
}
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