POSIX_SPAWNATTR_SETSIGDEFAULT(3)

💅 POSIX_SPAWNATTR_GETSIGDEFAULT(3) — get & set the spawn-sigdefault attribute 🎀

okay so bestie, we're in section 3 of the Library Functions Manual and today's main character is a little pair of functions that handle one very specific vibe: the spawn-sigdefault attribute of a spawn attributes object. it's giving "signal reset energy" and honestly? iconic. ✨

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🦋 LIBRARY 🦋

Standard C Library (libc, -lc) — she lives in libc, no cap 💜

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🌸 SYNOPSIS 🌸

first things first, you gotta invite the header:

#include <spawn.h>

then the two functions, in all their glory:

int
posix_spawnattr_getsigdefault(const posix_spawnattr_t *restrict attr,
    sigset_t *restrict sigdefault);

int
posix_spawnattr_setsigdefault(posix_spawnattr_t *attr,
    const sigset_t *restrict sigdefault);

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💖 DESCRIPTION 💖

okay so. posix_spawnattr_getsigdefault() gets — she obtains the value of the spawn-sigdefault attribute from the attributes object that attr points to. read it, don't touch it, respectfully. 👑

and posix_spawnattr_setsigdefault() sets — she sets the spawn-sigdefault attribute inside an already-initialized attributes object referenced by attr. you gotta initialize it first bestie, no shortcuts.

now for the actual lore: the spawn-sigdefault attribute represents the set of signals to be forced to default signal handling in the new process image. and like, that only happens if POSIX_SPAWN_SETSIGDEF is set in the spawn-flags attribute, so don't forget that gate 🚪 — it's conditional, iykyk.

the default value of this attribute? an empty signal set. literally nothing in it. a clean slate. a fresh face. 💀✨

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🫶 RETURN VALUES 🫶

both posix_spawnattr_getsigdefault() and posix_spawnattr_setsigdefault() return zero. that's it. zero. slay, consistent queens 👑

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🔥 SEE ALSO 🔥

go read the whole friend group, they all link up:

• posix_spawn(3)
• posix_spawnattr_destroy(3)
• posix_spawnattr_getsigmask(3)
• posix_spawnattr_init(3)
• posix_spawnattr_setsigmask(3)
• posix_spawnp(3)

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⭐ STANDARDS ⭐

posix_spawnattr_getsigdefault() and posix_spawnattr_setsigdefault() conform to IEEE Std 1003.1-2001 (“POSIX.1”). certified. paperwork handled. 📜

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🌈 HISTORY 🌈

these two first appeared in FreeBSD 8.0. throwback era fr fr 🕰️

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👑 AUTHORS 👑

Ed Schouten <ed@FreeBSD.org> — the icon who brought us here 🫡

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and that's the page, bestie! 💅 this whole thing came to you courtesy of Debian, dated March 24, 2008 — so like, vintage but make it POSIX ✨🎀🦋