shithub: riscv

ref: a1a120547768ee33ddaae4ee1965dfcf85149d8a
dir: /sys/man/2/postnote/

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.TH POSTNOTE 2
.SH NAME
postnote \- send a note to a process or process group
.SH SYNOPSIS
.B #include <u.h>
.br
.B #include <libc.h>
.PP
.nf
.B
int	postnote(int who, int pid, char *note)
.fi
.SH DESCRIPTION
.I Postnote
sends a note to a process or process group.
If
.I who
is
.BR PNPROC ,
then
.I note
is written to
.BI /proc/ pid /note\f1.
If
.I who
is
.BI PNGROUP , 
the note is delivered to the
process group by writing
.I note
to
.BI /proc/ pid /notepg\f1.
For
.B PNGROUP
only, if the calling process is in the target group, the note is
.I not
delivered to that process.
.PP
If the write is successful, zero is returned.
Otherwise \-1 is returned.
.SH SOURCE
.B /sys/src/libc/9sys/postnote.c
.SH "SEE ALSO"
.IR notify (2),
.IR intro (2),
.IR proc (3)
.SH DIAGNOSTICS
Sets
.IR errstr .