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POSIX_TRACE_CLEAR(P) POSIX_TRACE_CLEAR(P)
NAME
posix_trace_clear - clear trace stream and trace log (TRACING)
SYNOPSIS
#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 run-
ning 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.
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 argu-
ment 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
None.
SEE ALSO
posix_trace_attr_init() , posix_trace_create() , posix_trace_flush() ,
posix_trace_get_attr() , the Base Definitions volume of IEEE Std 1003.1-2001,
<sys/types.h>, <trace.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
POSIX 2003 POSIX_TRACE_CLEAR(P)
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