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POSIX_TRACE_CLOSE
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
Return to Main Contents
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()
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posix_trace_get_attr()
posix_trace_get_status()
posix_trace_getnext_event()
posix_trace_rewind()
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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
None.
SEE ALSO
posix_trace_get_attr(), posix_trace_get_filter(), posix_trace_getnext_event(),
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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