3 postnote \- send a note to a process or process group
11 int postnote(int who, int pid, char *note)
15 sends a note to a process or process group.
23 .BI /proc/ pid /note\f1.
28 the note is delivered to the
29 process group by writing
32 .BI /proc/ pid /notepg\f1.
35 only, if the calling process is in the target group, the note is
37 delivered to that process.
39 If the write is successful, zero is returned.
40 Otherwise \-1 is returned.
42 .B /sys/src/libc/9sys/postnote.c