Add Base.set_process_title, Base.get_process_title

Not exported. Fixes #9957.

Author: ihnorton

NEWS.md

@@ -165,6 +165,8 @@ Library improvements
 
   * Rational arithmetic throws errors on overflow ([#8672]).
 
+  * Added Base.get_process_title / Base.set_process_title. ([#9957])
+
 Deprecated or removed
 ---------------------
 

base/util.jl

@@ -262,3 +262,14 @@ function julia_cmd(julia=joinpath(JULIA_HOME, "julia"))
 end
 
 julia_exename() = ccall(:jl_is_debugbuild,Cint,())==0 ? "julia" : "julia-debug"
+
+function get_process_title()
+    buf = zeros(Uint8, 512)
+    err = ccall(:uv_get_process_title, Cint, (Ptr{Uint8}, Cint), buf, 512)
+    uv_error("get_process_title", err)
+    bytestring(pointer(buf))
+end
+function set_process_title(title::AbstractString)
+    err = ccall(:uv_set_process_title, Cint, (Ptr{UInt8},), bytestring(title))
+    uv_error("set_process_title", err)
+end

doc/stdlib/base.rst

@@ -621,6 +621,14 @@ System
    and waits for the process to complete.  Returns the value returned
    by ``f``.
 
+.. function:: Base.set_process_title(title::AbstractString)
+
+   Set the process title. No-op on some operating systems. (not exported)
+
+.. function:: Base.get_process_title()
+
+   Get the process title. On some systems, will always return empty string. (not exported)
+
 .. function:: readandwrite(command)
 
    Starts running a command asynchronously, and returns a tuple (stdout,stdin,process) of the output stream and input stream of the process, and the process object itself.