<commit_before>.\" Copyright (c) 1993
.\"	The Regents of the University of California.  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.
.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
.\"
.\"     @(#)ktrace.2	8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd July 13, 2008
.Dt KTRACE 2
.Os
.Sh NAME
.Nm ktrace
.Nd process tracing
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/param.h
.In sys/time.h
.In sys/uio.h
.In sys/ktrace.h
.Ft int
.Fn ktrace "const char *tracefile" "int ops" "int trpoints" "int pid"
.Sh DESCRIPTION
The
.Fn ktrace
system call enables or disables tracing of one or more processes.
Users may only trace their own processes.
Only the super-user can trace setuid or setgid programs.
.Pp
The
.Fa tracefile
argument
gives the pathname of the file to be used for tracing.
The file must exist and be a regular file writable by the calling process.
All trace records are always appended to the file,
so the file must be truncated to zero length to discard
previous trace data.
If tracing points are being disabled (see KTROP_CLEAR below),
.Fa tracefile
may be NULL.
.Pp
The
.Fa ops
argument specifies the requested ktrace operation.
The defined operations are:
.Bl -column KTRFLAG_DESCENDXXX -offset indent
.It "KTROP_SET	Enable trace points specified in"
.Fa trpoints .
.It "KTROP_CLEAR	Disable trace points specified in
.Fa trpoints .
.It "KTROP_CLEARFILE	Stop all tracing."
.It "KTRFLAG_DESCEND	The tracing change should apply to the"
specified process and all its current children.
.El
.Pp
The
.Fa trpoints
argument specifies the trace points of interest.
The defined trace points are:
.Bl -column KTRFAC_SYSCALLXXX -offset indent
.It "KTRFAC_SYSCALL	Trace system calls."
.It "KTRFAC_SYSRET	Trace return values from system calls."
.It "KTRFAC_NAMEI	Trace name lookup operations."
.It "KTRFAC_GENIO	Trace all I/O (note that this option can"
generate much output).
.It "KTRFAC_PSIG	Trace posted signals."
.It "KTRFAC_CSW	Trace context switch points."
.It "KTRFAC_INHERIT	Inherit tracing to future children."
.El
.Pp
Each tracing event outputs a record composed of a generic header
followed by a trace point specific structure.
The generic header is:
.Bd -literal
struct ktr_header {
	int	ktr_len;		/* length of buf */
	short	ktr_type;		/* trace record type */
	pid_t	ktr_pid;		/* process id */
	char	ktr_comm[MAXCOMLEN+1];	/* command name */
	struct	timeval ktr_time;	/* timestamp */
	intptr_t	ktr_tid;	/* was ktr_buffer */
};
.Ed<commit_msg>Document some not-so-recently added trace points.<commit_after>.\" Copyright (c) 1993
.\"	The Regents of the University of California.  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.
.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
.\"
.\"     @(#)ktrace.2	8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd October 9, 2011
.Dt KTRACE 2
.Os
.Sh NAME
.Nm ktrace
.Nd process tracing
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/param.h
.In sys/time.h
.In sys/uio.h
.In sys/ktrace.h
.Ft int
.Fn ktrace "const char *tracefile" "int ops" "int trpoints" "int pid"
.Sh DESCRIPTION
The
.Fn ktrace
system call enables or disables tracing of one or more processes.
Users may only trace their own processes.
Only the super-user can trace setuid or setgid programs.
.Pp
The
.Fa tracefile
argument
gives the pathname of the file to be used for tracing.
The file must exist and be a regular file writable by the calling process.
All trace records are always appended to the file,
so the file must be truncated to zero length to discard
previous trace data.
If tracing points are being disabled (see KTROP_CLEAR below),
.Fa tracefile
may be NULL.
.Pp
The
.Fa ops
argument specifies the requested ktrace operation.
The defined operations are:
.Bl -column KTRFLAG_DESCENDXXX -offset indent
.It "KTROP_SET	Enable trace points specified in"
.Fa trpoints .
.It "KTROP_CLEAR	Disable trace points specified in
.Fa trpoints .
.It "KTROP_CLEARFILE	Stop all tracing."
.It "KTRFLAG_DESCEND	The tracing change should apply to the"
specified process and all its current children.
.El
.Pp
The
.Fa trpoints
argument specifies the trace points of interest.
The defined trace points are:
.Bl -column KTRFAC_PROCCTORXXX -offset indent
.It "KTRFAC_SYSCALL	Trace system calls."
.It "KTRFAC_SYSRET	Trace return values from system calls."
.It "KTRFAC_NAMEI	Trace name lookup operations."
.It "KTRFAC_GENIO	Trace all I/O (note that this option can"
generate much output).
.It "KTRFAC_PSIG	Trace posted signals."
.It "KTRFAC_CSW	Trace context switch points."
.It "KTRFAC_USER	Trace application-specific events."
.It "KTRFAC_STRUCT	Trace certain data structures."
.It "KTRFAC_SYSCTL	Trace sysctls."
.It "KTRFAC_PROCCTOR	Trace process construction."
.It "KTRFAC_PROCDTOR	Trace process destruction."
.It "KTRFAC_INHERIT	Inherit tracing to future children."
.El
.Pp
Each tracing event outputs a record composed of a generic header
followed by a trace point specific structure.
The generic header is:
.Bd -literal
struct ktr_header {
	int	ktr_len;		/* length of buf */
	short	ktr_type;		/* trace record type */
	pid_t	ktr_pid;		/* process id */
	char	ktr_comm[MAXCOMLEN+1];	/* command name */
	struct	timeval ktr_time;	/* timestamp */
	intptr_t	ktr_tid;	/* was ktr_buffer */
};
.Ed
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