[Distributed] Set stdin to devnull before closing it

Distributed closes and destroys stdin, but some tests attempted to
explicitly use it, leading to test problems. We previously interpreted
this as passing devnull, but this is better to be explicit.

(cherry picked from commit 64a86f9)

stdlib/Distributed/src/cluster.jl

@@ -232,7 +232,10 @@ start_worker(cookie::AbstractString=readline(stdin); kwargs...) = start_worker(s
 function start_worker(out::IO, cookie::AbstractString=readline(stdin); close_stdin::Bool=true, stderr_to_stdout::Bool=true)
     init_multi()
 
-    close_stdin && close(stdin) # workers will not use it
+    if close_stdin # workers will not use it
+        redirect_stdin(devnull)
+        close(stdin)
+    end
     stderr_to_stdout && redirect_stderr(stdout)
 
     init_worker(cookie)

stdlib/Distributed/test/distributed_exec.jl

@@ -1616,7 +1616,11 @@ cluster_cookie("")
 for close_stdin in (true, false), stderr_to_stdout in (true, false)
     local npids = addprocs_with_testenv(RetainStdioTester(close_stdin,stderr_to_stdout))
     @test remotecall_fetch(myid, npids[1]) == npids[1]
-    @test close_stdin != remotecall_fetch(()->isopen(stdin), npids[1])
+    if close_stdin
+        @test remotecall_fetch(()->stdin === devnull && !isreadable(stdin), npids[1])
+    else
+        @test remotecall_fetch(()->stdin !== devnull && isopen(stdin) && isreadable(stdin), npids[1])
+    end
     @test stderr_to_stdout == remotecall_fetch(()->(stderr === stdout), npids[1])
     rmprocs(npids)
 end

stdlib/REPL/src/TerminalMenus/util.jl

@@ -17,24 +17,24 @@ readbyte(stream::IO=stdin) = read(stream, Char)
 # Read the next key from stdin. It is also able to read several bytes for
 #   escaped keys such as the arrow keys, home/end keys, etc.
 # Escaped keys are returned using the `Key` enum.
-readkey(stream::Base.LibuvStream=stdin) = UInt32(_readkey(stream))
-function _readkey(stream::Base.LibuvStream=stdin)
+readkey(stream::IO=stdin) = UInt32(_readkey(stream))
+function _readkey(stream::IO=stdin)
     c = readbyte(stream)
 
     # Escape characters
     if c == '\x1b'
-        stream.buffer.size < 2 && return '\x1b'
+        bytesavailable(stream) < 1 && return '\x1b'
         esc_a = readbyte(stream)
         esc_a == 'v' && return PAGE_UP  # M-v
         esc_a == '<' && return HOME_KEY # M-<
         esc_a == '>' && return END_KEY  # M->
 
-        stream.buffer.size < 3 && return '\x1b'
+        bytesavailable(stream) < 1 && return '\x1b'
         esc_b = readbyte(stream)
 
         if esc_a == '[' || esc_a == 'O'
             if esc_b >= '0' && esc_b <= '9'
-                stream.buffer.size < 4 && return '\x1b'
+                bytesavailable(stream) < 1 && return '\x1b'
                 esc_c = readbyte(stream)
                 if esc_c == '~'
                     esc_b == '1' && return HOME_KEY

stdlib/REPL/test/TerminalMenus/legacytests/old_multiselect_menu.jl

@@ -33,6 +33,6 @@ TerminalMenus.writeLine(buf, multi_menu, 1, true)
 
 # Test SDTIN
 multi_menu = MultiSelectMenu(string.(1:10), warn=false)
-@test simulate_input(Set([1,2]), multi_menu, :enter, :down, :enter, 'd')
+@test simulate_input(multi_menu, :enter, :down, :enter, 'd') == Set([1,2])
 multi_menu = MultiSelectMenu(["single option"], warn=false)
-@test simulate_input(Set([1]), multi_menu, :up, :up, :down, :enter, 'd')
+@test simulate_input(multi_menu, :up, :up, :down, :enter, 'd') == Set([1])

stdlib/REPL/test/TerminalMenus/legacytests/old_radio_menu.jl

@@ -36,8 +36,8 @@ TerminalMenus.writeLine(buf, radio_menu, 1, true)
 
 # Test using stdin
 radio_menu = RadioMenu(string.(1:10), warn=false)
-@test simulate_input(3, radio_menu, :down, :down, :enter)
+@test simulate_input(radio_menu, :down, :down, :enter) == 3
 radio_menu = RadioMenu(["single option"], warn=false)
-@test simulate_input(1, radio_menu, :up, :up, :down, :up, :enter)
+@test simulate_input(radio_menu, :up, :up, :down, :up, :enter) == 1
 radio_menu = RadioMenu(string.(1:3), pagesize=1, warn=false)
-@test simulate_input(3, radio_menu, :down, :down, :down, :down, :enter)
+@test simulate_input(radio_menu, :down, :down, :down, :down, :enter) == 3

stdlib/REPL/test/TerminalMenus/multiselect_menu.jl

@@ -52,6 +52,6 @@ end
 
 # Test SDTIN
 multi_menu = MultiSelectMenu(string.(1:10), charset=:ascii)
-@test simulate_input(Set([1,2]), multi_menu, :enter, :down, :enter, 'd')
+@test simulate_input(multi_menu, :enter, :down, :enter, 'd') == Set([1,2])
 multi_menu = MultiSelectMenu(["single option"], charset=:ascii)
-@test simulate_input(Set([1]), multi_menu, :up, :up, :down, :enter, 'd')
+@test simulate_input(multi_menu, :up, :up, :down, :enter, 'd') == Set([1])

stdlib/REPL/test/TerminalMenus/multiselect_with_skip_menu.jl

@@ -121,10 +121,10 @@ menu = MultiSelectWithSkipMenu(string.(1:5), selected=[2, 3])
 buf = IOBuffer()
 TerminalMenus.printmenu(buf, menu, 1; init=true)
 @test occursin("2 items selected", String(take!(buf)))
-@test simulate_input(Set([2, 3, 4]), menu, 'n', :enter, 'd')
+@test simulate_input(menu, 'n', :enter, 'd') == Set([2, 3, 4])
 buf = IOBuffer()
 TerminalMenus.printmenu(buf, menu, 1; init=true)
 @test occursin("3 items selected", String(take!(buf)))
 
 menu = MultiSelectWithSkipMenu(string.(1:5), selected=[2, 3])
-@test simulate_input(Set([2]), menu, 'P', :enter, 'd', cursor=5)
+@test simulate_input(menu, 'P', :enter, 'd', cursor=5) == Set([2])

stdlib/REPL/test/TerminalMenus/radio_menu.jl

@@ -45,10 +45,10 @@ end
 
 # Test using stdin
 radio_menu = RadioMenu(string.(1:10); charset=:ascii)
-@test simulate_input(3, radio_menu, :down, :down, :enter)
+@test simulate_input(radio_menu, :down, :down, :enter) == 3
 radio_menu = RadioMenu(["single option"], charset=:ascii)
-@test simulate_input(1, radio_menu, :up, :up, :down, :up, :enter)
+@test simulate_input(radio_menu, :up, :up, :down, :up, :enter) == 1
 radio_menu = RadioMenu(string.(1:3), pagesize=1, charset=:ascii)
-@test simulate_input(3, radio_menu, :down, :down, :down, :down, :enter)
+@test simulate_input(radio_menu, :down, :down, :down, :down, :enter) == 3
 radio_menu = RadioMenu(["apple", "banana", "cherry"]; keybindings=collect('a':'c'), charset=:ascii)
-@test simulate_input(2, radio_menu, 'b')
+@test simulate_input(radio_menu, 'b') == 2

stdlib/REPL/test/TerminalMenus/runtests.jl

@@ -4,21 +4,22 @@ import REPL
 using REPL.TerminalMenus
 using Test
 
-function simulate_input(expected, menu::TerminalMenus.AbstractMenu, keys...;
-                        kwargs...)
+function simulate_input(menu::TerminalMenus.AbstractMenu, keys...; kwargs...)
     keydict =  Dict(:up => "\e[A",
                     :down => "\e[B",
                     :enter => "\r")
 
+    new_stdin = Base.BufferStream()
     for key in keys
         if isa(key, Symbol)
-            write(stdin.buffer, keydict[key])
+            write(new_stdin, keydict[key])
         else
-            write(stdin.buffer, "$key")
+            write(new_stdin, "$key")
         end
     end
+    TerminalMenus.terminal.in_stream = new_stdin
 
-    request(menu; suppress_output=true, kwargs...) == expected
+    return request(menu; suppress_output=true, kwargs...)
 end
 
 include("radio_menu.jl")