POSIX_TRACE_ATTR_GETCLOCKRES(3P)

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 .