.title  JTsubprc_control
;
; content : subprc-routines
; Starts and sends output to a subprocess.
;
        $DSCDEF
        $CLIDEF
        $IODEF
        $SSDEF
TRUE=-1
FALSE=0
        .macro  fixdesc,l,a
        .word   l
        .byte   DSC$K_DTYPE_T
        .byte   DSC$K_CLASS_S
        .address a
        .endm
        .macro  ascstr,s
        .ascii  "s"
        .align  long
        .endm
;
; readonly data section
;
        .psect  $PDATA quad,pic,con,lcl,shr,noexe,nowrt
argl_spawn:                             ; argumentlist LIB$SPAWN
        .long   12
        .long   0                       ; command-string
        .address JRTides                ; input-file
        .address JRTodes                ; output-file
        .address flags                  ; flags
        .long   0                       ; process-name
        .long   0                       ; process-name
        .long   0                       ; command-status
        .long   0                       ; event-flag
        .long   0                       ; ast-address
        .long   0                       ; ast-parameter
        .long   0                       ; prompt
        .long   0                       ; cli
JRTides: fixdesc 12,JRTiadr               ; input-mailbox descriptor
JRTiadr: ascstr  <JRT3_MBX_INPUT>
JRTodes: fixdesc 13,JRToadr               ; output-mailbox descriptor
JRToadr: ascstr  <JRT3_MBX_OUTPUT>
flags:  .long   CLI$M_NOWAIT
messiz: .long   128
bufsiz: .long   4096
;
; writeread data section
;
        .psect  $LOCAL quad,pic,con,lcl,noshr,noexe,wrt
argl_crembx:                            ; argumentlist SYS$CREMBX
        .long   7
        .long   0                       ; perm-flag
        .blkl   1                       ; channel
        .address messiz                 ; max-message
        .address bufsiz                 ; buffer-quota
        .long   0                       ; protection-mask
        .long   0                       ; access-mode
        .blkl   1                       ; lognam
argl_qio:                               ; argumentlist  SYS$QIOW
        .long   12
        .long   0                       ; efn
        .blkl   1                       ; chan
        .blkl   1                       ; func
        .address stat                   ; iosb
        .long   0                       ; astadr
        .long   0                       ; astprm
        .blkl   1                       ; p1
        .blkl   1                       ; p2
        .long   0                       ; p3
        .long   0                       ; p4
        .long   0                       ; p5
        .long   0                       ; p6
stat:   .blkq   1
chani:  .blkw   1
chano:  .blkw   1
;
; code section
;
        .psect  $CODE quad,pic,con,lcl,shr,exe,nowrt
;***************************************
;
;  JRT3_SUB_GET ( LIN , LINLEN , OK )
;
;  subprocess get output line
;
;***************************************
        .entry  JRT3_sub_get,^m<>
        movw    chano,argl_qio+8
        movl    #IO$_READVBLK!IO$M_NOW,argl_qio+12
        movl    B^4(ap),r0
        movw    (r0),argl_qio+32
        movl    B^4(r0),argl_qio+28
        callg   argl_qio,G^SYS$QIOW
        cmpw    r0,#SS$_NORMAL
        bneq    100$
        cmpw    stat,#SS$_NORMAL
        bneq    100$
        movzwl  stat+2,@B^8(ap)
        movl    #TRUE,@B^12(ap)
        ret
100$:   movl    #FALSE,@B^12(ap)
        ret
;***************************************
;
;  JRT3_SUB_INIT
;
;  subprocess initiate
;
;***************************************
        .entry  JRT3_sub_init,^m<>
        moval   chani,argl_crembx+8
        moval   JRTides,argl_crembx+28
        callg   argl_crembx,G^SYS$CREMBX
        moval   chano,argl_crembx+8
        moval   JRTodes,argl_crembx+28
        callg   argl_crembx,G^SYS$CREMBX
        callg   argl_spawn,G^LIB$SPAWN
        ret
;***************************************
;
;  JRT3_SUB_PUT ( CMD )
;
;  subprocess put command
;
;***************************************
        .entry  JRT3_sub_put,^m<>
        movw    chani,argl_qio+8
        movl    #IO$_WRITEVBLK!IO$M_NOW,argl_qio+12
        movl    B^4(ap),r0
        movw    (r0),argl_qio+32
        movl    B^4(r0),argl_qio+28
        callg   argl_qio,G^SYS$QIOW
        ret
        .end