term% cat index.txt POSTNOTE(2) System Calls Manual POSTNOTE(2)
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. If who is PNPROC,
then note is written to /proc/pid/note. If who is PNGROUP, the note is
delivered to the process group by writing note to /proc/pid/notepg.
For PNGROUP only, if the calling process is in the target group, the
note is not delivered to that process.
If the write is successful, zero is returned. Otherwise -1 is re‐
turned.
SOURCE
/sys/src/libc/9sys/postnote.c
SEE ALSO
notify(2), intro(2), proc(3)
DIAGNOSTICS
Sets errstr.
POSTNOTE(2)