unix: error when uv_setup_args() is not called

This commit updates uv_{get,set}_process_title() to return an
error when uv_setup_args() is needed, but has not been called.

Per-platform behavior after this commit:

- Windows: uv_setup_args() does nothing, get/set process title
  works as before.
- Unix: get/set process title will return ENOBUFS if
  uv_setup_args() wasn't called, if it failed, or if the process
  title memory has been freed by uv__process_title_cleanup()
  (via uv_library_shutdown()).
- AIX: set process title returns ENOBUFS if uv_setup_args()
  wasn't called, if it failed to allocate memory for the argv
  copy, or if the proctitle memory has been freed by
  uv__process_title_cleanup() (via uv_library_shutdown).
  Getting the process title will do the same except it can
  still succeed if uv_setup_args() was called but failed to
  allocate memory for the argv copy.
- BSD: uv_setup_args() is only needed for getting the initial
  process title; if uv_setup_args() is not called then any
  get_process_title calls() before a set_process_title() call
  will return an empty string.
- Platforms that use no-proctitle.c: get will return an empty
  string, set is a no-op (these are the same as before this commit)

Fixes: https://github.com/libuv/libuv/issues/2845
PR-URL: https://github.com/libuv/libuv/pull/2853
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>

0 files changed, 0 insertions, 0 deletions