The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> posix_trace_clear - clear trace stream and trace log (TRACING)

#### SYNOPSIS

> ``[OB TRC] #include <sys/types.h>
> #include <trace.h>
> int posix_trace_clear(trace_id_t` trid`);``
> `
> `

#### DESCRIPTION

> The posix_trace_clear() function shall reinitialize the trace stream identified by the argument trid as if it were returning from the posix_trace_create() function, except that the same allocated resources shall be reused, the mapping of trace event type identifiers to trace event names shall be unchanged, and the trace stream status shall remain unchanged (that is, if it was running, it remains running and if it was suspended, it remains suspended).

> All trace events in the trace stream recorded before the call to posix_trace_clear() shall be lost. The posix_stream_full_status status shall be set to POSIX_TRACE_NOT_FULL. There is no guarantee that all trace events that occurred during the posix_trace_clear() call are recorded; the behavior with respect to trace points that may occur during this call is unspecified.

> [OB TRL] If the Trace Log option is supported and the trace stream has been created with a log, the posix_trace_clear() function shall reinitialize the trace stream with the same behavior as if the trace stream was created without the log, plus it shall reinitialize the trace log associated with the trace stream identified by the argument trid as if it were returning from the posix_trace_create_withlog() function, except that the same allocated resources, for the trace log, may be reused and the associated trace stream status remains unchanged. The first trace event recorded in the trace log after the call to posix_trace_clear() shall be the same as the first trace event recorded in the active trace stream after the call to posix_trace_clear(). The posix_log_full_status status shall be set to POSIX_TRACE_NOT_FULL. There is no guarantee that all trace events that occurred during the posix_trace_clear() call are recorded in the trace log; the behavior with respect to trace points that may occur during this call is unspecified. If the log full policy is POSIX_TRACE_APPEND, the effect of a call to this function is unspecified for the trace log associated with the trace stream identified by the trid argument.

#### RETURN VALUE

> Upon successful completion, the posix_trace_clear() function shall return a value of zero. Otherwise, it shall return the corresponding error number.

#### ERRORS

> The posix_trace_clear() function shall fail if:

> [EINVAL]
>   The value of the trid argument does not correspond to an active trace stream.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> The posix_trace_clear() function may be removed in a future version.

#### SEE ALSO

> posix_trace_attr_destroy, posix_trace_create, posix_trace_get_attr

> XBD <sys/types.h>, <trace.h>

#### CHANGE HISTORY

> First released in Issue 6. Derived from IEEE Std 1003.1q-2000.

> IEEE PASC Interpretation 1003.1 #123 is applied.

#### Issue 7

> The posix_trace_clear() function is marked obsolescent.

End of informative text.

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