scripting (lua/js): utils.getpid: make wrapper of pid property

We now have at least 3 scripting APIs which are trivial wrappers
around properties: mp.get_mouse_pos, utils.getcwd, utils.getpid.

After some discussion on IRC it was decided that it's easier for us to
maintain them as trivial wrappers than to deprecate them and inflict
pain on users and script authors, so currently no plan to deprecate.

player/javascript.c

@@ -40,7 +40,6 @@
 #include "misc/bstr.h"
 #include "osdep/timer.h"
 #include "osdep/threads.h"
-#include "osdep/getpid.h"
 #include "stream/stream.h"
 #include "sub/osd.h"
 #include "core.h"
@@ -925,12 +924,6 @@ static void script_get_user_path(js_State *J, void *af)
     js_pushstring(J, mp_get_user_path(af, jctx(J)->mpctx->global, path));
 }
 
-// args: none
-static void script_getpid(js_State *J)
-{
-    js_pushnumber(J, mp_getpid());
-}
-
 // args: prefixed file name, data (c-str)
 static void script_write_file(js_State *J, void *af)
 {
@@ -1183,7 +1176,6 @@ static const struct fn_entry utils_fns[] = {
     FN_ENTRY(split_path, 1),
     AF_ENTRY(join_path, 2),
     AF_ENTRY(get_user_path, 1),
-    FN_ENTRY(getpid, 0),
     FN_ENTRY(get_env_list, 0),
 
     FN_ENTRY(read_file, 2),

player/javascript/defaults.js

@@ -663,6 +663,7 @@ mp.get_script_file = function() { return mp.script_file };
 mp.get_script_directory = function() { return mp.script_path };
 mp.get_time = function() { return mp.get_time_ms() / 1000 };
 mp.utils.getcwd = function() { return mp.get_property("working-directory") };
+mp.utils.getpid = function() { return mp.get_property_number("pid") }
 mp.get_mouse_pos = function() { return mp.get_property_native("mouse-pos") };
 mp.dispatch_event = dispatch_event;
 mp.process_timers = process_timers;

player/lua.c

@@ -45,7 +45,6 @@
 #include "osdep/subprocess.h"
 #include "osdep/timer.h"
 #include "osdep/threads.h"
-#include "osdep/getpid.h"
 #include "stream/stream.h"
 #include "sub/osd.h"
 #include "core.h"
@@ -1146,12 +1145,6 @@ static int script_join_path(lua_State *L)
     return 1;
 }
 
-static int script_getpid(lua_State *L)
-{
-    lua_pushnumber(L, mp_getpid());
-    return 1;
-}
-
 static int script_parse_json(lua_State *L, void *tmp)
 {
     mp_lua_optarg(L, 2);
@@ -1247,7 +1240,6 @@ static const struct fn_entry utils_fns[] = {
     FN_ENTRY(file_info),
     FN_ENTRY(split_path),
     FN_ENTRY(join_path),
-    FN_ENTRY(getpid),
     AF_ENTRY(parse_json),
     AF_ENTRY(format_json),
     FN_ENTRY(get_env_list),

player/lua/defaults.lua

@@ -747,6 +747,10 @@ function mp_utils.getcwd()
     return mp.get_property("working-directory")
 end
 
+function mp_utils.getpid()
+    return mp.get_property_number("pid")
+end
+
 function mp_utils.format_bytes_humanized(b)
     local d = {"Bytes", "KiB", "MiB", "GiB", "TiB", "PiB"}
     local i = 1