Copyright (c) 1996 Sun Microsystems, Inc. All Rights Reserved
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cc [ flag ... ] file ... -ltnfctl [ library ... ] #include <tnf/tnfctl.h> tnfctl_errcode_t tnfctl_kernel_open(tnfctl_handle_t **ret_val);
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.
tnfctl_kernel_open returns TNFCTL_ERR_NONE upon success.
Permission denied. Superuser privileges are needed for kernel tracing.
Another client is currently using kernel tracing.
Memory allocation failed.
Some other failure occurred.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| MT Level MT-Safe |
prex(1), fuser(1M), TNF_PROBE(3TNF), libtnfctl(3TNF), tracing(3TNF), tnf_kernel_probes(4), attributes(5)