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NetBSD/tests/lib/libc/sys/t_fork.c

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/* $NetBSD: t_fork.c,v 1.4 2019/04/06 15:41:54 kamil Exp $ */
/*-
* Copyright (c) 2018, 2019 The NetBSD Foundation, Inc.
* All rights reserved.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__COPYRIGHT("@(#) Copyright (c) 2018, 2019\
The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_fork.c,v 1.4 2019/04/06 15:41:54 kamil Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <sched.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include <atf-c.h>
#ifdef VFORK
#define FORK vfork
#else
#define FORK fork
#endif
/*
* A child process cannot call atf functions and expect them to magically
* work like in the parent.
* The printf(3) messaging from a child will not work out of the box as well
* without estabilishing a communication protocol with its parent. To not
* overcomplicate the tests - do not log from a child and use err(3)/errx(3)
* wrapped with ASSERT_EQ()/ASSERT_NEQ() as that is guaranteed to work.
*/
#define ASSERT_EQ(x, y) \
do { \
uintmax_t vx = (x); \
uintmax_t vy = (y); \
int ret = vx == vy; \
if (!ret) \
errx(EXIT_FAILURE, "%s:%d %s(): Assertion failed for: " \
"%s(%ju) == %s(%ju)", __FILE__, __LINE__, __func__, \
#x, vx, #y, vy); \
} while (/*CONSTCOND*/0)
#define ASSERT_NEQ(x, y) \
do { \
uintmax_t vx = (x); \
uintmax_t vy = (y); \
int ret = vx != vy; \
if (!ret) \
errx(EXIT_FAILURE, "%s:%d %s(): Assertion failed for: " \
"%s(%ju) != %s(%ju)", __FILE__, __LINE__, __func__, \
#x, vx, #y, vy); \
} while (/*CONSTCOND*/0)
static pid_t
await_stopped_child(pid_t process)
{
struct kinfo_proc2 *p = NULL;
size_t i, len;
pid_t child = -1;
int name[] = {
[0] = CTL_KERN,
[1] = KERN_PROC2,
[2] = KERN_PROC_ALL,
[3] = 0,
[4] = sizeof(struct kinfo_proc2),
[5] = 0
};
const size_t namelen = __arraycount(name);
/* Await the process becoming a zombie */
while(1) {
name[5] = 0;
ASSERT_EQ(sysctl(name, namelen, 0, &len, NULL, 0), 0);
ASSERT_EQ(reallocarr(&p, len, sizeof(struct kinfo_proc2)), 0);
name[5] = len;
ASSERT_EQ(sysctl(name, namelen, p, &len, NULL, 0), 0);
for (i = 0; i < len/sizeof(struct kinfo_proc2); i++) {
if (p[i].p_pid == getpid())
continue;
if (p[i].p_ppid != process)
continue;
if (p[i].p_stat != LSSTOP)
continue;
child = p[i].p_pid;
break;
}
if (child != -1)
break;
ASSERT_EQ(usleep(1000), 0);
}
/* Free the buffer */
ASSERT_EQ(reallocarr(&p, 0, sizeof(struct kinfo_proc2)), 0);
return child;
}
static void
raise_raw(int sig)
{
int rv, status;
pid_t child, parent, watcher, wpid;
int expect_core = (sig == SIGABRT) ? 1 : 0;
/*
* Spawn a dedicated thread to watch for a stopped child and emit
* the SIGKILL signal to it.
*
* This is required in vfork(2)ing parent and optional in fork(2).
*
* vfork(2) might clobber watcher, this means that it's safer and
* simpler to reparent this process to initproc and forget about it.
*/
if (sig == SIGSTOP
#ifndef VFORK
|| (sig == SIGTSTP || sig == SIGTTIN || sig == SIGTTOU)
#endif
) {
parent = getpid();
watcher = fork();
ATF_REQUIRE(watcher != 1);
if (watcher == 0) {
/* Double fork(2) trick to reparent to initproc */
watcher = fork();
ASSERT_NEQ(watcher, -1);
if (watcher != 0)
_exit(0);
child = await_stopped_child(parent);
errno = 0;
rv = kill(child, SIGKILL);
ASSERT_EQ(rv, 0);
ASSERT_EQ(errno, 0);
/* This exit value will be collected by initproc */
_exit(0);
}
wpid = waitpid(watcher, &status, 0);
ATF_REQUIRE_EQ(wpid, watcher);
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE(!WIFCONTINUED(status));
ATF_REQUIRE(!WIFSIGNALED(status));
ATF_REQUIRE(!WIFSTOPPED(status));
ATF_REQUIRE_EQ(WEXITSTATUS(status), 0);
}
child = FORK();
ATF_REQUIRE(child != 1);
if (child == 0) {
rv = raise(sig);
ASSERT_EQ(rv, 0);
_exit(0);
}
wpid = waitpid(child, &status, 0);
ATF_REQUIRE_EQ(wpid, child);
switch (sig) {
case SIGKILL:
case SIGABRT:
case SIGHUP:
ATF_REQUIRE(!WIFEXITED(status));
ATF_REQUIRE(!WIFCONTINUED(status));
ATF_REQUIRE(WIFSIGNALED(status));
ATF_REQUIRE(!WIFSTOPPED(status));
ATF_REQUIRE_EQ(WTERMSIG(status), sig);
ATF_REQUIRE_EQ(!!WCOREDUMP(status), expect_core);
break;
#ifdef VFORK
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
#endif
case SIGCONT:
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE(!WIFCONTINUED(status));
ATF_REQUIRE(!WIFSIGNALED(status));
ATF_REQUIRE(!WIFSTOPPED(status));
ATF_REQUIRE_EQ(WEXITSTATUS(status), 0);
break;
#ifndef VFORK
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
#endif
case SIGSTOP:
ATF_REQUIRE(!WIFEXITED(status));
ATF_REQUIRE(!WIFCONTINUED(status));
ATF_REQUIRE(WIFSIGNALED(status));
ATF_REQUIRE(!WIFSTOPPED(status));
ATF_REQUIRE_EQ(WTERMSIG(status), SIGKILL);
ATF_REQUIRE_EQ(!!WCOREDUMP(status), 0);
}
}
#define RAISE(test, sig) \
ATF_TC(test); \
ATF_TC_HEAD(test, tc) \
{ \
\
atf_tc_set_md_var(tc, "descr", \
"raise " #sig " in a child"); \
} \
\
ATF_TC_BODY(test, tc) \
{ \
\
raise_raw(sig); \
}
RAISE(raise1, SIGKILL) /* non-maskable */
RAISE(raise2, SIGSTOP) /* non-maskable */
RAISE(raise3, SIGTSTP) /* ignored in vfork(2) */
RAISE(raise4, SIGTTIN) /* ignored in vfork(2) */
RAISE(raise5, SIGTTOU) /* ignored in vfork(2) */
RAISE(raise6, SIGABRT) /* regular abort trap */
RAISE(raise7, SIGHUP) /* hangup */
RAISE(raise8, SIGCONT) /* continued? */
/// ----------------------------------------------------------------------------
static int
clone_func(void *arg __unused)
{
return 0;
}
static void
nested_raw(const char *fn, volatile int flags)
{
int status;
pid_t child, child2, wpid;
const size_t stack_size = 1024 * 1024;
void *stack, *stack_base;
stack = malloc(stack_size);
ATF_REQUIRE(stack != NULL);
#ifdef __MACHINE_STACK_GROWS_UP
stack_base = stack;
#else
stack_base = (char *)stack + stack_size;
#endif
flags |= SIGCHLD;
child = FORK();
ATF_REQUIRE(child != 1);
if (child == 0) {
if (strcmp(fn, "fork") == 0)
child2 = fork();
else if (strcmp(fn, "vfork") == 0)
child2 = vfork();
else if (strcmp(fn, "clone") == 0)
child2 = __clone(clone_func, stack_base, flags, NULL);
else
__unreachable();
ASSERT_NEQ(child2, -1);
if ((strcmp(fn, "fork") == 0) || (strcmp(fn, "vfork") == 0)) {
if (child2 == 0)
_exit(0);
}
wpid = waitpid(child2, &status, 0);
ASSERT_EQ(child2, wpid);
ASSERT_EQ(!!WIFEXITED(status), true);
ASSERT_EQ(!!WIFCONTINUED(status), false);
ASSERT_EQ(!!WIFSIGNALED(status), false);
ASSERT_EQ(!!WIFSTOPPED(status), false);
ASSERT_EQ(WEXITSTATUS(status), 0);
_exit(0);
}
wpid = waitpid(child, &status, 0);
ATF_REQUIRE_EQ(wpid, child);
ATF_REQUIRE_EQ(!!WIFEXITED(status), true);
ATF_REQUIRE_EQ(!!WIFCONTINUED(status), false);
ATF_REQUIRE_EQ(!!WIFSIGNALED(status), false);
ATF_REQUIRE_EQ(!!WIFSTOPPED(status), false);
ATF_REQUIRE_EQ(WEXITSTATUS(status), 0);
}
#define NESTED(test, fn, flags) \
ATF_TC(test); \
ATF_TC_HEAD(test, tc) \
{ \
\
atf_tc_set_md_var(tc, "descr", \
"Test nested " #fn " in a child"); \
} \
\
ATF_TC_BODY(test, tc) \
{ \
\
nested_raw(#fn, flags); \
}
NESTED(nested_fork, fork, 0)
NESTED(nested_vfork, vfork, 0)
NESTED(nested_clone, clone, 0)
NESTED(nested_clone_vm, clone, CLONE_VM)
NESTED(nested_clone_fs, clone, CLONE_FS)
NESTED(nested_clone_files, clone, CLONE_FILES)
//NESTED(nested_clone_sighand, clone, CLONE_SIGHAND) // XXX
NESTED(nested_clone_vfork, clone, CLONE_VFORK)
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, raise1);
ATF_TP_ADD_TC(tp, raise2);
ATF_TP_ADD_TC(tp, raise3);
ATF_TP_ADD_TC(tp, raise4);
ATF_TP_ADD_TC(tp, raise5);
ATF_TP_ADD_TC(tp, raise6);
ATF_TP_ADD_TC(tp, raise7);
ATF_TP_ADD_TC(tp, raise8);
ATF_TP_ADD_TC(tp, nested_fork);
ATF_TP_ADD_TC(tp, nested_vfork);
ATF_TP_ADD_TC(tp, nested_clone);
ATF_TP_ADD_TC(tp, nested_clone_vm);
ATF_TP_ADD_TC(tp, nested_clone_fs);
ATF_TP_ADD_TC(tp, nested_clone_files);
// ATF_TP_ADD_TC(tp, nested_clone_sighand); // XXX
ATF_TP_ADD_TC(tp, nested_clone_vfork);
return atf_no_error();
}
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