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