man/man3tnf/tnfctl_kernel_open.3tnf

         te
 Copyright (c) 1996 Sun Microsystems, Inc. All Rights Reserved
 The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
 You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
 When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
 tnfctl_kernel_open 3TNF "4 Mar 1997" "SunOS 5.11" "TNF Library Functions"
 NAME
tnfctl_kernel_open - create handle for kernel probe control
 SYNOPSIS

cc [ flag ... ] file ... -ltnfctl [ library ... ]
#include <tnf/tnfctl.h>


tnfctl_errcode_t tnfctl_kernel_open(tnfctl_handle_t **ret_val);


 DESCRIPTION

tnfctl_kernel_open() starts a kernel tracing session and returns in
ret_val an opaque handle that can be used to control tracing and probes
in the kernel. Only one kernel tracing session is possible at a time on a
given machine. An error code of TNFCTL_ERR_BUSY is returned if there is
another process using kernel tracing. Use the command
fuser -f /dev/tnfctl


to print the process id of the process currently using kernel tracing. Only a
superuser may use tnfctl_kernel_open(). An error code of
TNFCTL_ERR_ACCES is returned if the caller does not have the necessary
privileges.
 RETURN VALUES

tnfctl_kernel_open returns TNFCTL_ERR_NONE upon success.
 ERRORS

TNFCTL_ERR_ACCES

Permission denied. Superuser privileges are needed for kernel tracing.


TNFCTL_ERR_BUSY

Another client is currently using kernel tracing.


TNFCTL_ERR_ALLOCFAIL

Memory allocation failed.


TNFCTL_ERR_FILENOTFOUND

/dev/tnfctl not found.


TNFCTL_ERR_INTERNAL

Some other failure occurred.


 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
MT LevelMT-Safe


 SEE ALSO

prex(1), fuser(1M), TNF_PROBE(3TNF), libtnfctl(3TNF),
tracing(3TNF), tnf_kernel_probes(4), attributes(5)