/* $NetBSD: pipe1.c,v 1.3 2008/04/28 20:23:06 martin Exp $ */ /*- * Copyright (c) 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Luke Mewburn and Jaromir Dolecek. * * 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/param.h> #include <sys/event.h> #include <sys/mount.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <inttypes.h> int main(int argc, char **argv) { int kq, n; struct kevent event[1]; char buffer[128]; int fds[2]; if (pipe(fds) < 0) err(1, "pipe"); kq = kqueue(); if (kq < 0) err(1, "kqueue"); event[0].ident = fds[0]; event[0].filter = EVFILT_READ; event[0].flags = EV_ADD | EV_ENABLE; n = kevent(kq, event, 1, NULL, 0, NULL); if (n < 0) err(1, "kevent(1)"); /* make sure there is something in the pipe */ (void) write(fds[1], "foo", 3); printf("pipe: wrote 'foo' to pipe\n"); n = kevent(kq, NULL, 0, event, 1, NULL); if (n < 0) err(1, "kevent(2)"); printf("kevent num %d flags: %#x, fflags: %#x, data: %" PRId64 "\n", n, event[0].flags, event[0].fflags, event[0].data); n = read(fds[0], buffer, event[0].data); if (n < 0) err(1, "read"); buffer[n] = '\0'; printf("pipe: read '%s'\n", buffer); printf("pipe: successful end\n"); exit(0); }