POSIX_TRACE_CLOSE
Section: POSIX Programmer's Manual (3P)
Updated: 2013
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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_close,
posix_trace_open,
posix_trace_rewind
--- trace log management
(
TRACING)
SYNOPSIS
#include <trace.h>
int posix_trace_close(trace_id_t trid);
int posix_trace_open(int file_desc, trace_id_t *trid);
int posix_trace_rewind(trace_id_t trid);
DESCRIPTION
The
posix_trace_close()
function shall deallocate the trace log identifier indicated by
trid,
and all of its associated resources. If there is no valid trace log
pointed to by the
trid,
this function shall fail.
The
posix_trace_open()
function shall allocate the necessary resources and establish the
connection between a trace log identified by the
file_desc
argument and a trace stream identifier identified by the object pointed
to by the
trid
argument. The
file_desc
argument should be a valid open file descriptor that corresponds to a
trace log. The
file_desc
argument shall be open for reading. The current trace event timestamp,
which specifies the timestamp of the trace event that will be read by
the next call to
posix_trace_getnext_event(),
shall be set to the timestamp of the oldest trace event recorded in the
trace log identified by
trid.
The
posix_trace_open()
function shall return a trace stream identifier in the variable
pointed to by the
trid
argument, that may only be used by the following functions:
posix_trace_close()
posix_trace_eventid_equal()
posix_trace_eventid_get_name()
posix_trace_eventtypelist_getnext_id()
posix_trace_eventtypelist_rewind()
|
posix_trace_get_attr()
posix_trace_get_status()
posix_trace_getnext_event()
posix_trace_rewind()
|
In particular, notice that the operations normally used by a trace
controller process, such as
posix_trace_start(),
posix_trace_stop(),
or
posix_trace_shutdown(),
cannot be invoked using the trace stream identifier returned by the
posix_trace_open()
function.
The
posix_trace_rewind()
function shall reset the current trace event timestamp, which specifies
the timestamp of the trace event that will be read by the next call to
posix_trace_getnext_event(),
to the timestamp of the oldest trace event recorded in the trace log
identified by
trid.
RETURN VALUE
Upon successful completion, these functions shall return a value of
zero. Otherwise, they shall return the corresponding error number.
If successful, the
posix_trace_open()
function stores the trace stream identifier value in the object pointed
to by
trid.
ERRORS
The
posix_trace_open()
function shall fail if:
- EINTR
-
The operation was interrupted by a signal and thus no trace log was
opened.
- EINVAL
-
The object pointed to by
file_desc
does not correspond to a valid trace log.
The
posix_trace_close()
and
posix_trace_rewind()
functions may fail if:
- EINVAL
-
The object pointed to by
trid
does not correspond to a valid trace log.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
The
posix_trace_close(),
posix_trace_open(),
and
posix_trace_rewind()
functions may be removed in a future version.
SEE ALSO
posix_trace_get_attr(),
posix_trace_get_filter(),
posix_trace_getnext_event()
The Base Definitions volume of POSIX.1-2008,
<trace.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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