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Re: [patch] /* XXX - possibly run Coproc->name through word expansion? *


From: Dan Douglas
Subject: Re: [patch] /* XXX - possibly run Coproc->name through word expansion? */
Date: Mon, 2 May 2016 03:26:15 -0500

FWIW, something like this works currently. This pattern is useful in a
bunch of situations where the shell wants to assign to a fixed
variable name. (getopts being another).

 ~ $ bash /dev/fd/9 9<<\EOF
function mkProcs {
   typeset -n COPROC ref=$1
   set -- "address@hidden"
   for COPROC; do
       coproc {
           typeset status=$((RANDOM%255))
           echo "${!COPROC} status: $status"
           return "$status"
       }
       COPROC[2]=$COPROC_PID
   done
   for COPROC; do
       echo "${!COPROC}: $(cat <&"${COPROC[0]}"; wait "${COPROC[2]}") $?"
   done

}

typeset -a coprocs=({a..f}) "address@hidden"
mkProcs coprocs
EOF

/dev/fd/9: line 4: warning: execute_coproc: coproc [7768:COPROC] still exists
/dev/fd/9: line 4: warning: execute_coproc: coproc [7769:COPROC] still exists
/dev/fd/9: line 4: warning: execute_coproc: coproc [7770:COPROC] still exists
/dev/fd/9: line 4: warning: execute_coproc: coproc [7771:COPROC] still exists
/dev/fd/9: line 4: warning: execute_coproc: coproc [7772:COPROC] still exists
a: a status: 216 216
b: b status: 90 90
c: c status: 196 196
d: d status: 87 87
e: e status: 191 191
/dev/fd/9: line 13: "${COPROC[0]}": Bad file descriptor
f:  154

... Not sure why that last iteration always fails. I might want to
experiment with reducing the limitation that makes this only work
within a function on for loops over positional parameters. I know
that's how it is in ksh but I've never found that it's necessary.



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