.TH POSTNOTE 2
.SH NAME
postnote \- send a note to a process or process group
.SH SYNOPSIS
.nf
.B
int	postnote(int pid, char *note)
.fi
.SH DESCRIPTION
.I Postnote
sends a note to a process or process group.
If
.I pid
is positive,
.I note
is written to
.BI /proc/ pid /note.
If it is negative, the note is delivered to the
process group by writing
.I note
to
.BI /proc/ \-pid /notepg.
.PP
If the write is successful, zero is returned.
Otherwise \-1 is returned.
.SH "SEE ALSO"
.IR notify (2),
.IR intro (2),
.IR proc (3)
.SH DIAGNOSTICS
Sets
.I errstr.