1 /* $NetBSD: filemon_dev.c,v 1.4 2020/11/05 17:27:16 rillig Exp $ */
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/ioctl.h>
46 #define _PATH_FILEMON "/dev/filemon"
67 /* Allocate and zero a struct filemon object. */
68 F = calloc(1, sizeof *F);
72 /* Try opening /dev/filemon, up to six times (cargo cult!). */
73 for (i = 0; (F->fd = open(_PATH_FILEMON, O_RDWR|O_CLOEXEC)) == -1; i++) {
89 filemon_setfd(struct filemon *F, int fd)
92 /* Point the kernel at this file descriptor. */
93 if (ioctl(F->fd, FILEMON_SET_FD, &fd) == -1)
96 /* No need for it in userland any more; close it. */
104 filemon_setpid_parent(struct filemon *F, pid_t pid)
110 filemon_setpid_child(const struct filemon *F, pid_t pid)
113 /* Just pass it on to the kernel. */
114 return ioctl(F->fd, FILEMON_SET_PID, &pid);
118 filemon_close(struct filemon *F)
122 /* Close the filemon device fd. */
123 if (close(F->fd) == -1 && error == 0)
126 /* Free the filemon descriptor. */
129 /* Set errno and return -1 if anything went wrong. */
140 filemon_readfd(const struct filemon *F)
147 filemon_process(struct filemon *F)