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#!/bin/bash
function fd_available() {
for i in {1..65536}; do
if [ ! -e /proc/$$/fd/$i ]; then
echo $i;
return 0;
fi
done
return 1;
}
function fd_open() {
local fd=$1;
local mode=$2
local path=$3;
case $mode in
r)
eval "exec $fd<$path";;
w)
eval "exec $fd>$path";;
rw)
eval "exec $fd<>$path";;
*)
false;;
esac
}
function fd_cat() {
local fd=$1;
eval "cat <&$fd";
}
function fd_write() {
local fd=$1;
shift;
local msg="$@";
eval "echo $@ >&$fd";
}
function fd_close() {
local fd=$1;
eval "exec $fd>&-";
}
function fd_based_example() {
TEST fd=`fd_available`;
TEST fd_open $fd "rw" $M0/filename;
TEST fd_cat $fd; # print existing stuff
TEST fd_write $fd "new stuff"; # append
TEST fd_close $fd;
}
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