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POSIX_TRACE_GET_ATTR
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
posix_trace_get_attr, posix_trace_get_status - retrieve the trace
attributes or trace status
(TRACING)
SYNOPSIS
#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);
DESCRIPTION
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.
RETURN VALUE
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.
ERRORS
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.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
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>
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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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