Author: obrien
Date: Mon Jun 4 22:59:06 2012
New Revision: 236593
URL: http://svn.freebsd.org/changeset/base/236593
Log:
Add a man page for filemon(4) [r236592].
Added:
head/share/man/man4/filemon.4 (contents, props changed)
Modified:
head/share/man/man4/Makefile
Modified: head/share/man/man4/Makefile
==============================================================================
--- head/share/man/man4/Makefile Mon Jun 4 22:54:19 2012
(r236592)
+++ head/share/man/man4/Makefile Mon Jun 4 22:59:06 2012
(r236593)
@@ -126,6 +126,7 @@ MAN= aac.4 \
fdt.4 \
fdtbus.4 \
ffclock.4 \
+ filemon.4 \
firewire.4 \
fpa.4 \
fwe.4 \
Added: head/share/man/man4/filemon.4
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/man/man4/filemon.4 Mon Jun 4 22:59:06 2012
(r236593)
@@ -0,0 +1,166 @@
+.\" Copyright (c) 2012
+.\" David E. O'Brien <obr...@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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed by David E. O'Brien and
+.\" contributors.
+.\" 4. Neither the name of the author nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 30, 2012
+.Dt FILEMON 4
+.Os
+.Sh NAME
+.Nm filemon
+.Nd the filemon device
+.Sh SYNOPSIS
+.In dev/filemon/filemon.h
+.Sh DESCRIPTION
+The
+.Nm
+device allows a process to collect file operations data of its children.
+The device
+.Pa /dev/filemon
+responds to two
+.Xr ioctl 2
+calls.
+.Pp
+System calls are denoted using the following single letters:
+.Bl -tag -width indent -compact
+.It Dq Li C
+.Xr chdir 2
+.It Dq Li D
+.Xr unlink 2
+.It Dq Li E
+.Xr exec 2
+.It Dq Li F
+.Xr fork 2 ,
+.Xr vfork 2
+.It Dq Li L
+.Xr link 2 ,
+.Xr linkat 2 ,
+.Xr symlink 2 ,
+.Xr symlinkat 2
+.It Dq Li M
+.Xr rename 2
+.It Dq Li R
+.Xr open 2
+for read
+.It Dq Li S
+.Xr stat 2
+.It Dq Li W
+.Xr open 2
+for write
+.It Dq Li X
+.Xr _exit 2
+.El
+.Pp
+Note that
+.Dq R
+following
+.Dq W
+records can represent a single
+.Xr open 2
+for R/W,
+or two seperate
+.Xr open 2
+calls, one for
+R
+and one for
+W.
+.Sh IOCTLS
+User mode programs communicate with the filemon driver through a
+number of ioctls which are described below.
+Each takes a single argument.
+.Bl -tag -width FILEMON_SET_PID
+.It Dv FILEMON_SET_FD
+Write the internal tracing buffer to the supplied open file descriptor.
+.It Dv FILEMON_SET_PID .
+Child process ID to trace.
+.El
+.Pp
+.Sh RETURN VALUES
+The ioctl returns zero on success and non-zero on failure.
+.Sh EXAMPLES
+.Bd -literal -offset indent
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/ioctl.h>
+#include <dev/filemon/filemon.h>
+#include <fcntl.h>
+#include <err.h>
+
+static void
+open_filemon(void)
+{
+ pid_t child;
+ int fm_fd, fm_log;
+
+ if ((fm_fd = open("/dev/filemon", O_RDWR)) == -1)
+ err(1, "open(\"/dev/filemon\", O_RDWR)");
+ if ((fm_log = open("filemon.out",
+ O_CREAT | O_WRONLY | O_TRUNC, DEFFILEMODE)) == -1)
+ err(1, "open(filemon.out)");
+
+ if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) < 0)
+ err(1, "Cannot set filemon log file descriptor");
+ /* Set up these two fd's to close on exec. */
+ (void)fcntl(fm_fd, F_SETFD, FD_CLOEXEC);
+ (void)fcntl(fm_log, F_SETFD, FD_CLOEXEC);
+
+ if ((child = fork()) == 0) {
+ /* Do something here. */
+ return 0;
+ } else {
+ if (ioctl(fm_fd, FILEMON_SET_PID, &child) < 0)
+ err(1, "Cannot set filemon PID");
+ wait(&child);
+ close(fm_fd);
+ }
+ return 0;
+}
+.Ed
+.Pp
+Creates a file named
+.Pa filemon.out
+and configures the
+.Nm
+device to write the filemon buffer contents to it.
+.Sh FILES
+.Bl -tag -width /dev/zero
+.It Pa /dev/filemon
+.El
+.Sh SEE ALSO
+.Xr dtrace 1 ,
+.Xr ktrace 1 ,
+.Xr truss 1
+.Sh HISTORY
+A
+.Nm
+device appeared in
+.Fx 9.1 .
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