Rename shutdown() to closewrite()

This name was suggested in #24526 and

* Has a good analogy to close(), so people are likely to be able to
  guess what it means.
* Is more specific to IO (conversely, it's easy to imagine shutdown()
  being wanted for any number of things unrelated to closing the write
  side of an IO stream).

NEWS.md

@@ -49,7 +49,7 @@ Standard library changes
   overflow in most cases. The new function `checked_length` is now available, which will try to use checked
   arithmetic to error if the result may be wrapping. Or use a package such as SaferIntegers.jl when
   constructing the range. ([#40382])
-* TCP socket objects now expose `shutdown` functionality and support half-open mode usage ([#40783]).
+* TCP socket objects now expose `closewrite` functionality and support half-open mode usage ([#40783]).
 
 #### InteractiveUtils
 * A new macro `@time_imports` for reporting any time spent importing packages and their dependencies ([#41612])

base/exports.jl

@@ -803,7 +803,7 @@ export
 
 # I/O and events
     close,
-    shutdown,
+    closewrite,
     countlines,
     eachline,
     readeach,

base/io.jl

@@ -62,7 +62,7 @@ Close an I/O stream. Performs a [`flush`](@ref) first.
 function close end
 
 """
-    shutdown(stream)
+    closewrite(stream)
 
 Shutdown the write half of a full-duplex I/O stream. Performs a [`flush`](@ref)
 first. Notify the other end that no more data will be written to the underlying
@@ -76,12 +76,12 @@ julia> write(io, "request");
 
 julia> # calling `read(io)` here would block forever
 
-julia> shutdown(io);
+julia> closewrite(io);
 
 julia> read(io, String)
 "request"
 """
-function shutdown end
+function closewrite end
 
 """
     flush(stream)
@@ -410,7 +410,7 @@ end
 function pipe_reader end
 function pipe_writer end
 
-for f in (:flush, :shutdown, :iswritable)
+for f in (:flush, :closewrite, :iswritable)
     @eval $(f)(io::AbstractPipe) = $(f)(pipe_writer(io)::IO)
 end
 write(io::AbstractPipe, byte::UInt8) = write(pipe_writer(io)::IO, byte)

base/iobuffer.jl

@@ -334,9 +334,9 @@ end
 
 eof(io::GenericIOBuffer) = (io.ptr-1 == io.size)
 
-function shutdown(io::GenericIOBuffer)
+function closewrite(io::GenericIOBuffer)
     io.writable = false
-    # OR throw(_UVError("shutdown", UV_ENOTSOCK))
+    # OR throw(_UVError("closewrite", UV_ENOTSOCK))
     nothing
 end
 

base/process.jl

@@ -275,7 +275,7 @@ function setup_stdio(stdio::Union{IOBuffer, BufferStream}, child_readable::Bool)
                 @warn "Process error" exception=(ex, catch_backtrace())
             finally
                 close(parent)
-                child_readable || shutdown(stdio)
+                child_readable || closewrite(stdio)
             end
         end
     catch ex

base/stream.jl

@@ -433,7 +433,7 @@ function wait_readnb(x::LibuvStream, nb::Int)
     nothing
 end
 
-function shutdown(s::LibuvStream)
+function closewrite(s::LibuvStream)
     iolock_begin()
     check_open(s)
     req = Libc.malloc(_sizeof_uv_shutdown)
@@ -1476,7 +1476,7 @@ end
 
 isopen(s::BufferStream) = s.status != StatusClosed
 
-shutdown(s::BufferStream) = close(s)
+closewrite(s::BufferStream) = close(s)
 
 function close(s::BufferStream)
     lock(s.cond) do

doc/src/base/io-network.md

@@ -13,7 +13,7 @@ Base.take!(::Base.GenericIOBuffer)
 Base.fdio
 Base.flush
 Base.close
-Base.shutdown
+Base.closewrite
 Base.write
 Base.read
 Base.read!

stdlib/Sockets/test/runtests.jl

@@ -566,7 +566,7 @@ end
         end
         let s = Sockets.connect(addr)
             @test iswritable(s)
-            shutdown(s)
+            closewrite(s)
             @test !iswritable(s)
             close(s)
         end
@@ -578,7 +578,7 @@ end
             end
             @test iswritable(s)
             write(s, "hello world\n")
-            shutdown(s)
+            closewrite(s)
             @test !iswritable(s)
             @test isreadable(s)
             @test read(s, String) == "hello world\n"

test/iobuffer.jl

@@ -46,7 +46,7 @@ bufcontents(io::Base.GenericIOBuffer) = unsafe_string(pointer(io.data), io.size)
     @test String(take!(io)) == ""
     @test write(io, ComplexF64(0)) === 16
     @test write(io, Rational{Int64}(1//2)) === 16
-    @test shutdown(io) === nothing
+    @test closewrite(io) === nothing
     @test_throws ArgumentError write(io, UInt8[0])
     @test eof(io)
     @test close(io) === nothing
@@ -253,7 +253,7 @@ end
     @test !eof(bstream)
     read!(bstream,c)
     @test c == a[3:10]
-    @test shutdown(bstream) === nothing
+    @test closewrite(bstream) === nothing
     @test eof(bstream)
     @test bytesavailable(bstream) == 0
     @test close(bstream) === nothing