freebsd/lib/libsys/utrace.2

.\"	$NetBSD: utrace.2,v 1.11 2003/04/24 12:17:49 wiz Exp $
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Gregory McGarry <g.mcgarry@ieee.org>.
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.Dd December 11, 2015
.Dt UTRACE 2
.Os
.Sh NAME
.Nm utrace
.Nd insert user record in ktrace log
.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 utrace "const void *addr" "size_t len"
.Sh DESCRIPTION
Adds a record to the process trace with information supplied by user.
The record contains
.Fa len
bytes from memory pointed to by
.Fa addr .
This call only has an effect if the calling process is being traced.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINVAL
Specified data length
.Fa len
was bigger than
.Dv KTR_USER_MAXLEN .
.It Bq Er ENOMEM
Insufficient memory to honor the request.
.It Bq Er ENOSYS
Currently running kernel was compiled without
.Xr ktrace 2
support
.Pq Cd "options KTRACE" .
.El
.Sh SEE ALSO
.Xr kdump 1 ,
.Xr ktrace 1 ,
.Xr truss 1 ,
.Xr ktrace 2 ,
.Xr sysdecode_utrace 3
.Sh HISTORY
The
.Fn utrace
system call first appeared in
.Fx 2.2 .