postnote(3) - Plan 9 from User Space

| POSTNOTE(3) | POSTNOTE(3)
| 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 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. For `PNGROUP` only, if the calling process is in the target group, the note is not delivered to that process.
Returns zero if the write succeeds, otherwise –1.
SOURCE
| `/usr/lib/plan9/src/lib9/postnote.c`
SEE ALSO
| notify(3), intro(3)
DIAGNOSTICS
| Sets errstr.