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#!/bin/sh
#
# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
# 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 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.
#
# Test scenario by kib@
. ../default.cfg
odir=`pwd`
cd /tmp
sed '1,/^EOF/d' < $odir/$0 > kevent4.c
mycc -o kevent4 -Wall kevent4.c -pthread || exit 1
rm -f kevent4.c
cd $odir
export runRUNTIME=3m
(cd ..; ./run.sh > /dev/null 2>&1) &
rpid=$!
(cd $RUNDIR; /tmp/kevent4 $rpid > /dev/null) &
sleep 120
kill $rpid
../tools/killall.sh > /dev/null 2>&1
kill $!
wait
rm -f /tmp/kevent4
exit
EOF
#include <sys/types.h>
#include <sys/event.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef true
# define true 1
#endif
static int kq;
static void
err(const char *msg, int err_no)
{
fprintf(stderr, "%s: %s\n", msg, strerror(err_no));
exit(1);
}
static void
init_kq()
{
kq = kqueue();
if (kq == -1)
err("kqueue", errno);
}
static void
add_watch(pid_t pid)
{
struct kevent kev;
bzero(&kev, sizeof(kev));
kev.ident = pid;
kev.flags = EV_ADD | EV_ENABLE;
kev.filter = EVFILT_PROC;
kev.fflags = NOTE_EXIT | NOTE_FORK | NOTE_EXEC | NOTE_TRACK;
while (true) {
int res = kevent(kq, &kev, 1, NULL, 0, NULL);
if (res == -1) {
if (errno == EINTR)
continue;
if (errno == ESRCH)
break;
int err_no = errno;
char msg[64];
snprintf(msg, sizeof(msg),
"kevent - add watch for pid %u", pid);
err(msg, err_no);
}
else
break;
}
}
static void polling()
{
struct kevent kev[10];
pid_t pid;
int i;
while (true) {
bzero(&kev, sizeof(kev));
int res = kevent(kq, NULL, 0, kev,
sizeof(kev) / sizeof(kev[0]), NULL);
if (res == -1) {
if (errno == EINTR)
continue;
if (errno == ESRCH)
continue;
err("kevent", errno);
}
for (i = 0; i < res; i++) {
pid = kev[i].ident;
if (kev[i].fflags & NOTE_CHILD) {
add_watch(pid);
printf("%u - new process, parent %u\n", pid,
(unsigned int)kev[i].data);
}
if (kev[i].fflags & NOTE_FORK) {
printf("%u forked\n", pid);
}
if (kev[i].fflags & NOTE_EXEC) {
printf("%u called exec\n", pid);
}
if (kev[i].fflags & NOTE_EXIT) {
printf("%u exited\n", pid);
}
if (kev[i].fflags & NOTE_TRACK) {
printf("%u forked - track\n", pid);
}
if (kev[i].fflags & NOTE_TRACKERR) {
fprintf(stderr, "%u - track error\n", pid);
}
}
}
}
int main(int argc, char *argv[])
{
if (argc != 2) {
fprintf(stderr, "pid ?\n");
return (2);
}
pid_t parent = atoi(argv[1]);
init_kq();
add_watch(parent);
polling();
return (0);
}
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