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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 .
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