shithub: riscv

ref: 75d44bc306ffcbaadaa18c161bf54071304510b0
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 .