TNFCTL_KERNEL_OPEN(3TNF)TNFCTL_KERNEL_OPEN(3TNF)NAMEtnfctl_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);
DESCRIPTIONtnfctl_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 VALUEStnfctl_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 TYPE │ ATTRIBUTE VALUE │
├───────────────┼─────────────────┤
│MT Level │ MT-Safe │
└───────────────┴─────────────────┘
SEE ALSOprex(1), fuser(1M), TNF_PROBE(3TNF), libtnfctl(3TNF), tracing(3TNF),
tnf_kernel_probes(4), attributes(5)
Mar 4, 1997 TNFCTL_KERNEL_OPEN(3TNF)