MAC_IS_PRESENT(3)

📦 version 15.1, in freebsd 14.5, freebsd 15.1

💅 MAC_IS_PRESENT 💅

ok so bestie, welcome to mac_is_present — it's section 3 of the manual, and it lives in the Standard C Library (libc, link it with -lc). Its whole entire job? Telling you whether the system you're running on right now has MAC support. That's it. That's the gig. 👑

✨ NAME ✨

mac_is_present — report whether the running system has MAC support. literally just a yes/no girlie, and she does it flawlessly. 🎀

🌸 LIBRARY 🌸

Standard C Library (libc, -lc) — she's built in, no extra downloads, no cap. 🫶

🦋 SYNOPSIS 🦋

#include <sys/mac.h>

int
mac_is_present(const char *policyname);

that's the whole incantation, mwah 💋

💜 DESCRIPTION 💜

okay so mac_is_present() is the function that determines whether the currently-running kernel supports MAC for a given policy or not. vibe check on the kernel itself. 😌

Here's the tea on the argument:

  • If policyname is non-NULL, then the presence of the named policy gets checked — think names like "biba", "mls", "te". 👀
  • If policyname is NULL, then it checks the presence of any MAC policies at all. like, does this system have any MAC energy whatsoever? 🌈

🔥 RETURN VALUES 🔥

  • 1 — slay! the system supports the given MAC policy. ✅
  • 0 — nope, the specified MAC policy is not supported. 💀
  • -1 — something went wrong, an error occurred. 😭

🙈 ERRORS 🙈

  • [EINVAL] — the value of policyname is not valid. bestie what did you even type 😭
  • [ENOMEM] — insufficient memory was available to allocate internal storage. the system is out of room, no notes 🫠

⭐ SEE ALSO ⭐

the whole friend group, go say hi:

🧚 HISTORY 🧚

Support for Mandatory Access Control was introduced in FreeBSD 5.0 as part of the TrustedBSD Project. iconic behavior honestly, we love a glow-up origin story 🌟

and that's the page!! this beauty shipped with Debian, dated July 7, 2006 — yes she's an elder but she's still serving 💅💖 bye bestie, go check your policies 🦋

📦 where this page comes from