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/* $NetBSD: filemon_dev.c,v 1.3 2020/07/10 15:53:30 sjg Exp $ */
/*-
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* 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 "filemon.h"
#include <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_FILEMON_H
# include <filemon.h>
#endif
#ifndef _PATH_FILEMON
#define _PATH_FILEMON "/dev/filemon"
#endif
struct filemon {
int fd;
};
const char *
filemon_path(void)
{
return _PATH_FILEMON;
}
struct filemon *
filemon_open(void)
{
struct filemon *F;
unsigned i;
int error;
/* Allocate and zero a struct filemon object. */
F = calloc(1, sizeof(*F));
if (F == NULL)
return NULL;
/* Try opening /dev/filemon, up to six times (cargo cult!). */
for (i = 0; (F->fd = open(_PATH_FILEMON, O_RDWR|O_CLOEXEC)) == -1; i++) {
if (i == 5) {
error = errno;
goto fail0;
}
}
/* Success! */
return F;
fail0: free(F);
errno = error;
return NULL;
}
int
filemon_setfd(struct filemon *F, int fd)
{
/* Point the kernel at this file descriptor. */
if (ioctl(F->fd, FILEMON_SET_FD, &fd) == -1)
return -1;
/* No need for it in userland any more; close it. */
(void)close(fd);
/* Success! */
return 0;
}
void
filemon_setpid_parent(struct filemon *F, pid_t pid)
{
/* Nothing to do! */
}
int
filemon_setpid_child(const struct filemon *F, pid_t pid)
{
/* Just pass it on to the kernel. */
return ioctl(F->fd, FILEMON_SET_PID, &pid);
}
int
filemon_close(struct filemon *F)
{
int error = 0;
/* Close the filemon device fd. */
if (close(F->fd) == -1 && error == 0)
error = errno;
/* Free the filemon descriptor. */
free(F);
/* Set errno and return -1 if anything went wrong. */
if (error) {
errno = error;
return -1;
}
/* Success! */
return 0;
}
int
filemon_readfd(const struct filemon *F)
{
return -1;
}
int
filemon_process(struct filemon *F)
{
return 0;
}
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