tpostnote.3 - plan9port - [fork] Plan 9 from user space
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       tpostnote.3 (743B)
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            1 .TH POSTNOTE 3
            2 .SH NAME
            3 postnote \- send a note to a process or process group
            4 .SH SYNOPSIS
            5 .B #include <u.h>
            6 .br
            7 .B #include <libc.h>
            8 .PP
            9 .nf
           10 .B
           11 int        postnote(int who, int pid, char *note)
           12 .fi
           13 .SH DESCRIPTION
           14 .I Postnote
           15 sends a note to a process or process group.
           16 If
           17 .I who
           18 is
           19 .BR PNPROC ,
           20 then
           21 .I note
           22 is sent to the process with id
           23 .IR pid .
           24 If
           25 .I who
           26 is
           27 .BI PNGROUP , 
           28 the note is delivered to the
           29 process group containing the process with id
           30 .IR pid .
           31 For
           32 .B PNGROUP
           33 only, if the calling process is in the target group, the note is
           34 .I not
           35 delivered to that process.
           36 .PP
           37 Returns zero if the write succeeds, otherwise \-1.
           38 .SH SOURCE
           39 .B \*9/src/lib9/postnote.c
           40 .SH "SEE ALSO"
           41 .MR notify (3) ,
           42 .MR intro (3)
           43 .SH DIAGNOSTICS
           44 Sets
           45 .IR errstr .