aix: enable uv_get/set_process_title

This patch enables querying and setting the process title on AIX.
libuv takes ownership of the memory for argv and returns a deep copy
of the array and its contents.
It also enables the process_title test case.

The process title can be changed on AIX but is handled differently
to Linux/Mac. Commands like ps read the original argv array passed
to the process instead of the memory at argv[0]. To change the process
title we need to update argv[0] to point at a new string and set
argv[1] to NULL (if it exists). This means the process title
can be set to a string of any length.

PR-URL: https://github.com/libuv/libuv/pull/1187
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/docs/src/misc.rst b/docs/src/misc.rst
index 95237f49..71934694 100644
--- a/docs/src/misc.rst
+++ b/docs/src/misc.rst
@@ -192,7 +192,11 @@ API
 
 .. c:function:: int uv_set_process_title(const char* title)
 
-    Sets the current process title.
+    Sets the current process title. On platforms with a fixed size buffer for the
+    process title the contents of `title` will be copied to the buffer and
+    truncated if larger than the available space. Other platforms will return
+    `UV_ENOMEM` if they cannot allocate enough space to duplicate the contents of
+    `title`.
 
 .. c:function:: int uv_resident_set_memory(size_t* rss)