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 returned.