POSTNOTE(3)

🎀 POSTNOTE(3) 🎀

okay bestie, welcome to the postnote page from the Library Functions Manual — it's literally about sending a note to a process or a process group, and the vibe is immaculate 💌

✨ NAME ✨

postnote — send a note to a process or process group 💅

🌸 SYNOPSIS 🌸

#include <u.h>
#include <libc.h>

int  postnote(int who, int pid, char *note)

🦋 DESCRIPTION 🦋

postnote sends a note to a process or process group. here's the group-chat breakdown, no cap:

• if who is PNPROC, then note is sent to the process with id pid 💖
• if who is PNGROUP, the note is delivered to the process group containing the process with id pid 👑

🫶 special-case tea: for PNGROUP only, if the calling process is in the target group, the note is not delivered to that process. periodt.

it returns zero if the write succeeds, otherwise -1. that's the whole mood 🔥

🔥 SOURCE 🔥

/src/lib9/postnote.c

🌈 SEE ALSO 🌈

• notify(3)
• intro(3)

💜 DIAGNOSTICS 💜

sets errstr. yes bestie, that's the diagnostic behaviour — it sets errstr 🫶

xoxo, the Library Functions Manual 💖 — footer vibes: POSTNOTE(3), source at /src/lib9/postnote.c; this copy doesn't show extra date/version tea beyond that 🌸