man.postnix Miscellaneous man pages of Plan 9 related material

     POSTNOTE(3)                                           POSTNOTE(3)

     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 sent to the process with id pid. If
          who is PNGROUP, the note is delivered to the process group
          containing the process with id pid. For PNGROUP only, if the
          calling process is in the target group, the note is not
          delivered to that process.

          Returns zero if the write succeeds, otherwise -1.

     SOURCE
          /usr/local/plan9/src/lib9/postnote.c

     SEE ALSO
          notify(3), intro(3)

     DIAGNOSTICS
          Sets errstr.

     Page 1                       Plan 9            (printed 10/29/25)