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freebsd/lib/libc/sys/utrace.2
Joseph Koshy b10221ffd9 Have utrace(2) return ENOMEM if malloc() fails. Document this error
return in its manual page.

Reviewed by:	jhb
2003-11-11 04:54:11 +00:00

89 lines
3.0 KiB
Groff

.\" $NetBSD: utrace.2,v 1.11 2003/04/24 12:17:49 wiz Exp $
.\"
.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Gregory McGarry <g.mcgarry@ieee.org>.
.\"
.\" Redistribution and use in source and binary forms, with or without
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.\" notice, this list of conditions and the following disclaimer in the
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.\" This product includes software developed by the NetBSD
.\" Foundation, Inc. and its contributors.
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" $FreeBSD$
.\"
.Dd December 28, 2000
.Dt UTRACE 2
.Os
.Sh NAME
.Nm utrace
.Nd insert user record in ktrace log
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.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
Upon successful completion, a value of 0 is returned.
Otherwise, a value of -1 is returned and
.Va errno
is set to indicate the error.
.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 (option KTRACE).
.El
.Sh SEE ALSO
.Xr kdump 1 ,
.Xr ktrace 1 ,
.Xr ktrace 2
.Sh HISTORY
The
.Fn utrace
system call first appeared in
.Fx 2.2 .