shithub: riscv

ref: 6e74c7380f5b711e46314f3ad0e3f57e02271e46
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 .