sys_utsname.h(0P)

🦋 sys_utsname.h — bestie edition 🦋

ok so real talk, this is a page from the POSIX Programmer's Manual — the sys_utsname.h(0P) one, yeah that one. Buckle up, it's short but it's iconic.

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✨ PROLOG ✨

ngl, before we even start, there's a little disclaimer and you need to read it, bestie:

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.

So like… Linux might do its own lil thing here 💀 always double check the Linux page, okay? Don't come for me.

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🎀 NAME 🎀

sys/utsname.h — the system name structure. that's the whole vibe. it's giving "who am I, where am I, what am I running on" 💅

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🌸 SYNOPSIS 🌸

#include <sys/utsname.h>

that's it. that's the include. go off ✨

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💖 DESCRIPTION 💖

okay so the <sys/utsname.h> header shall define a structure called utsname, and it has to have at least these members:

char  sysname[]  Name of this implementation of the operating system.
char  nodename[] Name of this node within the communications
                 network to which this node is attached, if any.
char  release[]  Current release level of this implementation.
char  version[]  Current version level of this release.
char  machine[]  Name of the hardware type on which the system is running.

so basically: what OS is this, what's this node called on the network (if it's even on one, no pressure 🫶), what release, what version, and what hardware. the whole personality in five char arrays, periodt.

The character arrays are of unspecified size, but the data stored in them shall be terminated by a null byte.

🔥 lowkey important: unspecified size means don't go assuming a length, and it's null-byte terminated so don't you dare forget the \0.

and then this lil guy gets declared as a function — and it may also be defined as a macro (sneaky, i know):

int uname(struct utsname *);

The following sections are informative.

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🧚 APPLICATION USAGE 🧚

None.

like literally none. nothing. zero. the silence is deafening 😭

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🌈 RATIONALE 🌈

None.

same energy. nothing here. moving on bestie 🦋

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⭐ FUTURE DIRECTIONS ⭐

None.

no plans, no changes, no drama. it's stable, it's unbothered, it's main character energy 💅

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👑 SEE ALSO 👑

• The System Interfaces volume of POSIX.1‐2017, uname()

go read the uname() page next, that's where the actual action is, iykyk 🔥

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💜 COPYRIGHT 💜

okay legal era, but we keep it cute:

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 .

fr fr if something looks busted, it's probably a conversion glitch — report it at that link, don't just suffer in silence 🫶

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and that's the whole page, bestie!! brought to you by IEEE/The Open Group, 2017 — sys_utsname.h(0P), that's the one. slay, stay null-terminated, and don't forget to include your headers 💖✨🎀