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 identi-
       fier  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_get_attr()
  posix_trace_eventid_equal()               posix_trace_get_status()
  posix_trace_eventid_get_name()            posix_trace_getnext_event()
  posix_trace_eventtypelist_getnext_id()    posix_trace_rewind()
  posix_trace_eventtypelist_rewind()


       In particular, notice that the operations normally used by a trace con-
       troller process, such as  posix_trace_start(),  posix_trace_stop(),  or
       posix_trace_shutdown(),  cannot be invoked using the trace stream iden-
       tifier 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  time-
       stamp 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.

       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_get-
       next_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 .