POSIX_TRACE_CLOSE(P) POSIX Programmer's Manual POSIX_TRACE_CLOSE(P)
posix_trace_close, posix_trace_open, posix_trace_rewind - trace log management (TRACING)
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);
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 argu-
ment 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_get-
next_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:
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.
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.
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.
posix_trace_get_attr() , posix_trace_get_filter() , posix_trace_getnext_event() , 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 POSIX_TRACE_CLOSE(P)