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     POSTNOTE(2)                                           POSTNOTE(2)

     NAME
          postnote - send a note to a process or process group

     SYNOPSIS
          #include <u.h>
          #include <libc.h>

          int  postnote(int who, int pid, char *note)

     DESCRIPTION
          Postnote sends a note to a process or process group.  If who
          is PNPROC, then note is written to /proc/pid/note.  If who
          is PNGROUP, the note is delivered to the process group by
          writing note to /proc/pid/notepg.  For PNGROUP only, if the
          calling process is in the target group, the note is not
          delivered to that process.

          If the write is successful, zero is returned.  Otherwise -1
          is returned.

     SOURCE
          /sys/src/libc/9sys/postnote.c

     SEE ALSO
          notify(2), intro(2), proc(3)

     DIAGNOSTICS
          Sets errstr.

     Page 1                       Plan 9            (printed 10/24/25)