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_attr_getclockres,                              posix_trace_attr_getcreatetime,
       posix_trace_attr_getgenversion,   posix_trace_attr_getname,   posix_trace_attr_setname   —
       retrieve and set information about a trace stream (TRACING)

SYNOPSIS

       #include <time.h>
       #include <trace.h>

       int posix_trace_attr_getclockres(const trace_attr_t *attr,
           struct timespec *resolution);
       int posix_trace_attr_getcreatetime(const trace_attr_t *attr,
           struct timespec *createtime);

       #include <trace.h>

       int posix_trace_attr_getgenversion(const trace_attr_t *attr,
           char *genversion);
       int posix_trace_attr_getname(const trace_attr_t *attr,
           char *tracename);
       int posix_trace_attr_setname(trace_attr_t *attr,
           const char *tracename);

DESCRIPTION

       The  posix_trace_attr_getclockres()  function shall copy the clock resolution of the clock
       used to generate timestamps from the clock-resolution attribute of the  attributes  object
       pointed to by the attr argument into the structure pointed to by the resolution argument.

       The  posix_trace_attr_getcreatetime()  function  shall copy the trace stream creation time
       from the creation-time attribute of the attributes object pointed to by the attr  argument
       into  the  structure  pointed  to  by the createtime argument. The creation-time attribute
       shall represent the time of creation of the trace stream.

       The posix_trace_attr_getgenversion() function shall copy  the  string  containing  version
       information  from  the generation-version attribute of the attributes object pointed to by
       the attr argument into the string pointed to by the genversion  argument.  The  genversion
       argument   shall   be  the  address  of  a  character  array  which  can  store  at  least
       {TRACE_NAME_MAX} characters.

       The posix_trace_attr_getname() function shall copy the string containing  the  trace  name
       from  the  trace-name  attribute  of the attributes object pointed to by the attr argument
       into the string pointed to by the tracename argument. The tracename argument shall be  the
       address of a character array which can store at least {TRACE_NAME_MAX} characters.

       The  posix_trace_attr_setname() function shall set the name in the trace-name attribute of
       the attributes object pointed to by  the  attr  argument,  using  the  trace  name  string
       supplied   by   the  tracename  argument.  If  the  supplied  string  contains  more  than
       {TRACE_NAME_MAX} characters,  the  name  copied  into  the  trace-name  attribute  may  be
       truncated to one less than the length of {TRACE_NAME_MAX} characters. The default value is
       a null string.

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_attr_getclockres()  function stores the clock-resolution
       attribute value in the object pointed to by resolution.  Otherwise, the  content  of  this
       object is unspecified.

       If  successful,  the  posix_trace_attr_getcreatetime()  function  stores  the trace stream
       creation time in the object pointed to by createtime.   Otherwise,  the  content  of  this
       object is unspecified.

       If  successful,  the  posix_trace_attr_getgenversion()  function  stores the trace version
       information in the string pointed to by genversion.  Otherwise, the content of this string
       is unspecified.

       If successful, the posix_trace_attr_getname() function stores the trace name in the string
       pointed to by tracename.  Otherwise, the content of this string is unspecified.

ERRORS

       The           posix_trace_attr_getclockres(),            posix_trace_attr_getcreatetime(),
       posix_trace_attr_getgenversion(), and posix_trace_attr_getname() functions may fail if:

       EINVAL The value specified by one of the arguments is invalid.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       The            posix_trace_attr_getclockres(),           posix_trace_attr_getcreatetime(),
       posix_trace_attr_getgenversion(),             posix_trace_attr_getname(),              and
       posix_trace_attr_setname() functions may be removed in a future version.

SEE ALSO

       posix_trace_attr_destroy(), posix_trace_create(), posix_trace_get_attr(), uname()

       The Base Definitions volume of POSIX.1‐2017, <time.h>, <trace.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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 .