Originální popis anglicky:
posix_trace_get_attr, posix_trace_get_status - retrieve the trace attributes or
trace status (
TRACING)
Návod, kniha: POSIX Programmer's Manual
#include <trace.h>
int posix_trace_get_attr(trace_id_t
trid,
trace_attr_t *attr);
int posix_trace_get_status(trace_id_t
trid,
struct posix_trace_status_info
*
statusinfo);
The
posix_trace_get_attr() function shall copy the attributes of the
active trace stream identified by
trid into the object pointed to by
the
attr argument. If the Trace Log option is supported,
trid
may represent a pre-recorded trace log.
The
posix_trace_get_status() function shall return, in the structure
pointed to by the
statusinfo argument, the current trace status for the
trace stream identified by the
trid argument. These status values
returned in the structure pointed to by
statusinfo shall have been
appropriately read to ensure that the returned values are consistent.
If the Trace Log option is supported and the
trid argument
refers to a pre-recorded trace stream, the status shall be the status of the
completed trace stream.
Each time the
posix_trace_get_status() function is used, the overrun
status of the trace stream shall be reset to POSIX_TRACE_NO_OVERRUN
immediately after the call completes. If the Trace Log option is
supported, the
posix_trace_get_status() function shall behave the same
as when the option is not supported except for the following differences:
- *
- If the trid argument refers to a trace stream with
log, each time the posix_trace_get_status() function is used, the
log overrun status of the trace stream shall be reset to
POSIX_TRACE_NO_OVERRUN and the flush_error status shall be reset to
zero immediately after the call completes.
- *
- If the trid argument refers to a pre-recorded trace
stream, the status returned shall be the status of the completed trace
stream and the status values of the trace stream shall not be reset.
Upon successful completion, these functions shall return a value of zero.
Otherwise, they shall return the corresponding error number.
The
posix_trace_get_attr() function stores the trace attributes in the
object pointed to by
attr, if successful.
The
posix_trace_get_status() function stores the trace status in the
object pointed to by
statusinfo, if successful.
These functions shall fail if:
- EINVAL
- The trace stream argument trid does not correspond
to a valid active trace stream or a valid trace log.
The following sections are informative.
None.
None.
None.
None.
posix_trace_attr_destroy() ,
posix_trace_attr_init() ,
posix_trace_create() ,
posix_trace_open() , the Base Definitions
volume of IEEE Std 1003.1-2001,
<trace.h>
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
.
