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/*
* Copyright (c) 2009 Mark Heily <mark@heily.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $FreeBSD$
*/
#include <sys/stat.h>
#include <err.h>
#include "config.h"
#include "common.h"
static int sigusr1_caught = 0;
int kqfd;
static void
sig_handler(int signum)
{
sigusr1_caught = 1;
}
static void
add_and_delete(void)
{
struct kevent kev;
pid_t pid;
/* Create a child that waits to be killed and then exits */
pid = fork();
if (pid == 0) {
struct stat s;
if (fstat(kqfd, &s) != -1)
errx(1, "kqueue inherited across fork! (%s() at %s:%d)",
__func__, __FILE__, __LINE__);
pause();
exit(2);
}
printf(" -- child created (pid %d)\n", (int) pid);
test_begin("kevent(EVFILT_PROC, EV_ADD)");
test_no_kevents();
kevent_add(kqfd, &kev, pid, EVFILT_PROC, EV_ADD, 0, 0, NULL);
test_no_kevents();
success();
test_begin("kevent(EVFILT_PROC, EV_DELETE)");
sleep(1);
test_no_kevents();
kevent_add(kqfd, &kev, pid, EVFILT_PROC, EV_DELETE, 0, 0, NULL);
if (kill(pid, SIGKILL) < 0)
err(1, "kill");
sleep(1);
test_no_kevents();
success();
}
static void
proc_track(int sleep_time)
{
char test_id[64];
struct kevent kev;
pid_t pid;
int pipe_fd[2];
ssize_t result;
snprintf(test_id, sizeof(test_id),
"kevent(EVFILT_PROC, NOTE_TRACK); sleep %d", sleep_time);
test_begin(test_id);
test_no_kevents();
if (pipe(pipe_fd)) {
err(1, "pipe (parent) failed! (%s() at %s:%d)",
__func__, __FILE__, __LINE__);
}
/* Create a child to track. */
pid = fork();
if (pid == 0) { /* Child */
pid_t grandchild = -1;
/*
* Give the parent a chance to start tracking us.
*/
result = read(pipe_fd[1], test_id, 1);
if (result != 1) {
err(1, "read from pipe in child failed! (ret %zd) (%s() at %s:%d)",
result, __func__, __FILE__, __LINE__);
}
/*
* Spawn a grandchild that will immediately exit. If the kernel has bug
* 180385, the parent will see a kevent with both NOTE_CHILD and
* NOTE_EXIT. If that bug is fixed, it will see two separate kevents
* for those notes. Note that this triggers the conditions for
* detecting the bug quite reliably on a 1 CPU system (or if the test
* process is restricted to a single CPU), but may not trigger it on a
* multi-CPU system.
*/
grandchild = fork();
if (grandchild == 0) { /* Grandchild */
if (sleep_time) sleep(sleep_time);
exit(1);
} else if (grandchild == -1) { /* Error */
err(1, "fork (grandchild) failed! (%s() at %s:%d)",
__func__, __FILE__, __LINE__);
} else { /* Child (Grandchild Parent) */
printf(" -- grandchild created (pid %d)\n", (int) grandchild);
}
if (sleep_time) sleep(sleep_time);
exit(0);
} else if (pid == -1) { /* Error */
err(1, "fork (child) failed! (%s() at %s:%d)",
__func__, __FILE__, __LINE__);
}
printf(" -- child created (pid %d)\n", (int) pid);
kevent_add(kqfd, &kev, pid, EVFILT_PROC, EV_ADD | EV_ENABLE,
NOTE_TRACK | NOTE_EXEC | NOTE_EXIT | NOTE_FORK,
0, NULL);
printf(" -- tracking child (pid %d)\n", (int) pid);
/* Now that we're tracking the child, tell it to proceed. */
result = write(pipe_fd[0], test_id, 1);
if (result != 1) {
err(1, "write to pipe in parent failed! (ret %zd) (%s() at %s:%d)",
result, __func__, __FILE__, __LINE__);
}
/*
* Several events should be received:
* - NOTE_FORK (from child)
* - NOTE_CHILD (from grandchild)
* - NOTE_EXIT (from grandchild)
* - NOTE_EXIT (from child)
*
* The NOTE_FORK and NOTE_EXIT from the child could be combined into a
* single event, but the NOTE_CHILD and NOTE_EXIT from the grandchild must
* not be combined.
*
* The loop continues until no events are received within a 5 second
* period, at which point it is assumed that no more will be coming. The
* loop is deliberately designed to attempt to get events even after all
* the expected ones are received in case some spurious events are
* generated as well as the expected ones.
*/
{
int child_exit = 0;
int child_fork = 0;
int gchild_exit = 0;
int gchild_note = 0;
pid_t gchild_pid = -1;
int done = 0;
char *kev_str;
while (!done)
{
int handled = 0;
struct kevent *kevp;
kevp = kevent_get_timeout(kqfd, 5);
if (kevp == NULL) {
done = 1;
} else {
kev_str = kevent_to_str(kevp);
printf(" -- Received kevent: %s\n", kev_str);
free(kev_str);
if ((kevp->fflags & NOTE_CHILD) && (kevp->fflags & NOTE_EXIT)) {
errx(1, "NOTE_CHILD and NOTE_EXIT in same kevent: %s", kevent_to_str(kevp));
}
if (kevp->fflags & NOTE_CHILD) {
if (kevp->data == pid) {
if (!gchild_note) {
++gchild_note;
gchild_pid = kevp->ident;
++handled;
} else {
errx(1, "Spurious NOTE_CHILD: %s", kevent_to_str(kevp));
}
}
}
if (kevp->fflags & NOTE_EXIT) {
if ((kevp->ident == pid) && (!child_exit)) {
++child_exit;
++handled;
} else if ((kevp->ident == gchild_pid) && (!gchild_exit)) {
++gchild_exit;
++handled;
} else {
errx(1, "Spurious NOTE_EXIT: %s", kevent_to_str(kevp));
}
}
if (kevp->fflags & NOTE_FORK) {
if ((kevp->ident == pid) && (!child_fork)) {
++child_fork;
++handled;
} else {
errx(1, "Spurious NOTE_FORK: %s", kevent_to_str(kevp));
}
}
if (!handled) {
errx(1, "Spurious kevent: %s", kevent_to_str(kevp));
}
free(kevp);
}
}
/* Make sure all expected events were received. */
if (child_exit && child_fork && gchild_exit && gchild_note) {
printf(" -- Received all expected events.\n");
} else {
errx(1, "Did not receive all expected events.");
}
}
success();
}
#ifdef TODO
static void
event_trigger(void)
{
struct kevent kev;
pid_t pid;
test_begin("kevent(EVFILT_PROC, wait)");
/* Create a child that waits to be killed and then exits */
pid = fork();
if (pid == 0) {
pause();
printf(" -- child caught signal, exiting\n");
exit(2);
}
printf(" -- child created (pid %d)\n", (int) pid);
test_no_kevents();
kevent_add(kqfd, &kev, pid, EVFILT_PROC, EV_ADD, 0, 0, NULL);
/* Cause the child to exit, then retrieve the event */
printf(" -- killing process %d\n", (int) pid);
if (kill(pid, SIGUSR1) < 0)
err(1, "kill");
kevent_cmp(&kev, kevent_get(kqfd));
test_no_kevents();
success();
}
void
test_kevent_signal_disable(void)
{
const char *test_id = "kevent(EVFILT_SIGNAL, EV_DISABLE)";
struct kevent kev;
test_begin(test_id);
EV_SET(&kev, SIGUSR1, EVFILT_SIGNAL, EV_DISABLE, 0, 0, NULL);
if (kevent(kqfd, &kev, 1, NULL, 0, NULL) < 0)
err(1, "%s", test_id);
/* Block SIGUSR1, then send it to ourselves */
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
err(1, "sigprocmask");
if (kill(getpid(), SIGKILL) < 0)
err(1, "kill");
test_no_kevents();
success();
}
void
test_kevent_signal_enable(void)
{
const char *test_id = "kevent(EVFILT_SIGNAL, EV_ENABLE)";
struct kevent kev;
test_begin(test_id);
EV_SET(&kev, SIGUSR1, EVFILT_SIGNAL, EV_ENABLE, 0, 0, NULL);
if (kevent(kqfd, &kev, 1, NULL, 0, NULL) < 0)
err(1, "%s", test_id);
/* Block SIGUSR1, then send it to ourselves */
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
err(1, "sigprocmask");
if (kill(getpid(), SIGUSR1) < 0)
err(1, "kill");
kev.flags = EV_ADD | EV_CLEAR;
#if LIBKQUEUE
kev.data = 1; /* WORKAROUND */
#else
kev.data = 2; // one extra time from test_kevent_signal_disable()
#endif
kevent_cmp(&kev, kevent_get(kqfd));
/* Delete the watch */
kev.flags = EV_DELETE;
if (kevent(kqfd, &kev, 1, NULL, 0, NULL) < 0)
err(1, "%s", test_id);
success();
}
void
test_kevent_signal_del(void)
{
const char *test_id = "kevent(EVFILT_SIGNAL, EV_DELETE)";
struct kevent kev;
test_begin(test_id);
/* Delete the kevent */
EV_SET(&kev, SIGUSR1, EVFILT_SIGNAL, EV_DELETE, 0, 0, NULL);
if (kevent(kqfd, &kev, 1, NULL, 0, NULL) < 0)
err(1, "%s", test_id);
/* Block SIGUSR1, then send it to ourselves */
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
err(1, "sigprocmask");
if (kill(getpid(), SIGUSR1) < 0)
err(1, "kill");
test_no_kevents();
success();
}
void
test_kevent_signal_oneshot(void)
{
const char *test_id = "kevent(EVFILT_SIGNAL, EV_ONESHOT)";
struct kevent kev;
test_begin(test_id);
EV_SET(&kev, SIGUSR1, EVFILT_SIGNAL, EV_ADD | EV_ONESHOT, 0, 0, NULL);
if (kevent(kqfd, &kev, 1, NULL, 0, NULL) < 0)
err(1, "%s", test_id);
/* Block SIGUSR1, then send it to ourselves */
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
err(1, "sigprocmask");
if (kill(getpid(), SIGUSR1) < 0)
err(1, "kill");
kev.flags |= EV_CLEAR;
kev.data = 1;
kevent_cmp(&kev, kevent_get(kqfd));
/* Send another one and make sure we get no events */
if (kill(getpid(), SIGUSR1) < 0)
err(1, "kill");
test_no_kevents();
success();
}
#endif
void
test_evfilt_proc()
{
kqfd = kqueue();
signal(SIGUSR1, sig_handler);
add_and_delete();
proc_track(0); /* Run without sleeping before children exit. */
proc_track(1); /* Sleep a bit in the children before exiting. */
#if TODO
event_trigger();
#endif
signal(SIGUSR1, SIG_DFL);
#if TODO
test_kevent_signal_add();
test_kevent_signal_del();
test_kevent_signal_get();
test_kevent_signal_disable();
test_kevent_signal_enable();
test_kevent_signal_oneshot();
#endif
close(kqfd);
}
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