shithub: riscv

ref: 55e0fd603151867eac865be660767dcc4289ed87
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 .