IF_NAMETOINDEX(3P)

📦 version 2017a, in alpine 3.22, alpine 3.23, alpine 3.24, arch rolling, nixpkgs unstable, opensuse-leap 16.0

💖 IF_NAMETOINDEX(3P) 💖

okay so bestie, this one's from the POSIX Programmer's Manual (yes, the 3P is giving "POSIX, not Linux, don't @ me"). Just so you know going in:

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. 😭

fr fr, check your local manpage before you commit, okay? 💅

✨ NAME ✨

if_nametoindex — map a network interface name to its corresponding index

like, you have the name, you want the number. that's it. that's the whole job. 🎀

🌸 SYNOPSIS 🌸

#include <net/if.h>

unsigned if_nametoindex(const char *ifname);

one function, one argument, one unsigned coming back at you. iconic. ✨

🦋 DESCRIPTION 🦋

The if_nametoindex() function shall return the interface index corresponding to name ifname.

that's the whole vibe. you hand it a name, it hands you back the index. no cap. 🫶

💜 RETURN VALUE 💜

  • The corresponding index — if ifname is the name of an interface. slay. 👑
  • zero — otherwise. not slay. 💀

🙈 ERRORS 🙈

No errors are defined.

ngl there's literally nothing here to catch. it just returns zero and moves on with its life. main character energy.

The following sections are informative. (translation: they're the vibes-only sections, not the rules-rules sections 🧚)

🍓 EXAMPLES 🍓

None.

😭 bestie they really said "figure it out yourself." respect tho.

🌈 APPLICATION USAGE 🌈

None.

same energy. nothing here. moving on. 💖

⭐ RATIONALE ⭐

None.

not me scrolling for lore and finding zero lore. 🫠

🎀 FUTURE DIRECTIONS 🎀

None.

crystal ball says: unchanged. periodt. ✨

🔥 SEE ALSO 🔥

  • getsockopt()
  • if_freenameindex()
  • if_indextoname() — the reverse girlie, index to name 💫
  • if_nameindex()
  • setsockopt()

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

iykyk — go read those next, bestie. the whole interface-name friend group is lowkey iconic. 🫶

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 .

and that's the whole page, bestie!! 💖✨🎀🦋🌸💅🫶

this masterpiece of a page is brought to you by IEEE/The Open Group, dated 2017 — yes, 2017, she's vintage and she's still serving. 🌟 no cap.

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