mziwisky · November 9, 2020 02:23 · Nov 9, 2020 · Nov 6, 2020 · Nov 6, 2020
diff --git a/main.rb b/main.rb
@@ -6,14 +6,18 @@
 output = ''
 status = Open3.popen2e('./sub.rb') do |std_in, std_out_err, wait_thr|
   Thread.new do
-    while out = std_out_err.read(4)
-      print(out); STDOUT.flush
-      output += out
+    begin
+      while out = std_out_err.readpartial(64)
+        print(out); STDOUT.flush
+        output += out
+      end
+    rescue EOFError
     end
     std_out_err.close
   end
   Thread.new do
-    while input = STDIN.read(4)
+    while input = STDIN.readpartial(64)
+      output += input
       std_in.write(input)
     end
     std_in.close

diff --git a/sub.rb b/sub.rb
@@ -1,5 +1,9 @@
 #!/usr/bin/env ruby
 
+# this is important!  I don't know of a way that it could be set
+# from main.rb, e.g. if you only had control of main.rb and not sub.rb
+STDOUT.sync = true
+
 puts "it's a test!"
 loop do
   print "gimme something (q to quit)> "

diff --git a/main.rb b/main.rb
@@ -2,6 +2,7 @@
 
 require 'open3'
 
+puts 'party time'
 output = ''
 status = Open3.popen2e('./sub.rb') do |std_in, std_out_err, wait_thr|
   Thread.new do

diff --git a/main.rb b/main.rb
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+require 'open3'
+
+output = ''
+status = Open3.popen2e('./sub.rb') do |std_in, std_out_err, wait_thr|
+  Thread.new do
+    while out = std_out_err.read(4)
+      print(out); STDOUT.flush
+      output += out
+    end
+    std_out_err.close
+  end
+  Thread.new do
+    while input = STDIN.read(4)
+      std_in.write(input)
+    end
+    std_in.close
+  end
+  wait_thr.value.exitstatus
+end
+
+puts "Output: #{output}"
+puts "Status: #{status}"
diff --git a/sub.rb b/sub.rb
@@ -0,0 +1,9 @@
+#!/usr/bin/env ruby
+
+puts "it's a test!"
+loop do
+  print "gimme something (q to quit)> "
+  x = gets.chomp
+  puts "you gave me #{x}"
+  exit if x == 'q'
+end
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