POSIX_T...LOCKRES(3POSIX)

💖 POSIX_T...LOCKRES(3POSIX) 💖

okay bestie, gather round, because this one is from the POSIX Programmer's Manual and it's all about tracing and trace stream attributes and honestly? it's giving very specific, very niche, very iconic. 🦋

🚨 PROLOG 🚨

so like, heads up before we even start: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ — so if you're on Linux, go check the corresponding Linux manual page for the actual deets on Linux behavior. OR, plot twist, the interface might not even be implemented on Linux at all. 😭 not me finding out the hard way. so check first, bestie, fr fr.

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✨ 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). 💅 the whole lil friend group, together, slaying.

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🌸 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);

like yes, <trace.h> shows up twice, no that's not a typo, that's just how the standard said it. we don't question the standard. 😌

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💜 DESCRIPTION 💜

okay so here's what each of these lil functions actually does:

posix_trace_attr_getclockres() — this one copies the clock resolution of the clock used to generate timestamps, straight out of the clock-resolution attribute of the attributes object that attr points to, and drops it into the structure that resolution points to. ✨

posix_trace_attr_getcreatetime() — this one copies the trace stream creation time from the creation-time attribute of the attributes object pointed to by attr, into the structure pointed to by createtime. and bestie, the creation-time attribute shall represent the time of creation of the trace stream. that's its whole job. 🎀

posix_trace_attr_getgenversion() — copies the string containing version information from the generation-version attribute of the attributes object pointed to by attr, into the string pointed to by genversion. and genversion shall be the address of a character array that can store at least {TRACE_NAME_MAX} characters. so like, size it right or don't come crying to me. 🙈

posix_trace_attr_getname() — copies the string containing the trace name from the trace-name attribute of the attributes object pointed to by attr, into the string pointed to by tracename. and tracename shall be the address of a character array that can store at least {TRACE_NAME_MAX} characters. same energy as above, same warning. 💅

posix_trace_attr_setname() — this one sets the name in the trace-name attribute of the attributes object pointed to by attr, using the trace name string that tracename supplies. 🫶

⚠️ okay important: if the string you supply 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. so like, it can and will get cut, no cap.

and the default value? a null string. so it starts out empty, main character with a blank nametag. 😌

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🦋 RETURN VALUE 🦋

upon successful completion, these functions shall return a value of zero. otherwise, they shall return the corresponding error number. that's it, that's the deal. ✨

and then, like, per function:

• If successful, posix_trace_attr_getclockres() stores the clock-resolution attribute value in the object pointed to by resolution. otherwise, the content of this object is unspecified. 💀
• If successful, posix_trace_attr_getcreatetime() stores the trace stream creation time in the object pointed to by createtime. otherwise, the content of this object is unspecified.
• If successful, posix_trace_attr_getgenversion() stores the trace version information in the string pointed to by genversion. otherwise, the content of this string is unspecified.
• If successful, posix_trace_attr_getname() stores the trace name in the string pointed to by tracename. otherwise, the content of this string is unspecified.

like "unspecified" is just the standard's way of saying "idk bestie, don't look at it, don't touch it, don't trust it." 😭

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💀 ERRORS 💀

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

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

note the "may", okay? it's a maybe, not a promise. the standard is being mysterious about it. 🙈

The following sections are informative.

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🎀 EXAMPLES 🎀

None. (the standard really said "figure it out yourself, queen." and honestly? respect.)

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🌈 APPLICATION USAGE 🌈

None. (again. they're keeping it minimal, it's giving mystery, it's giving ~aura~.)

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⭐ RATIONALE ⭐

None. (no thoughts, head empty, just vibes. the reasoning is between them and the universe, i guess.)

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🔥 FUTURE DIRECTIONS 🔥

okay so this is the part where you gotta pay attention bestie:

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

so like. they might not be here forever. use them while you can, iykyk.

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👑 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>

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💖 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 . 🐛

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and that's the whole page, bestie!! brought to you by IEEE/The Open Group, dated 2017, from the POSIX Programmer's Manual.** mwah. 💋 stay tracin', stay iconic, and always size your {TRACE_NAME_MAX} buffers. 🎀✨💖