darwin: implement uv_set_process_title, part 1

Apply undocumented Carbon magic to change the process title in a way
that's visible in the Activity Monitor.

config-unix.mk

@@ -70,11 +70,15 @@ endif
 
 ifeq (darwin,$(OS))
 CPPFLAGS += -D_DARWIN_USE_64_BIT_INODE=1
-LDFLAGS+=-framework CoreServices -dynamiclib -install_name "@rpath/libuv.dylib"
+LDFLAGS += -framework Foundation \
+           -framework CoreServices \
+           -framework ApplicationServices \
+           -dynamiclib -install_name "@rpath/libuv.dylib"
 SOEXT = dylib
 OBJS += src/unix/darwin.o
 OBJS += src/unix/kqueue.o
 OBJS += src/unix/fsevents.o
+OBJS += src/unix/darwin-proctitle.o
 endif
 
 ifeq (linux,$(OS))
@@ -156,3 +160,6 @@ clean-platform:
 
 distclean-platform:
 	-rm -f libuv.a libuv.$(SOEXT) test/run-{tests,benchmarks}.dSYM
+
+%.pic.o %.o:  %.m
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $^ -o $@

src/unix/darwin-proctitle.m

@@ -0,0 +1,78 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <Cocoa/Cocoa.h>
+
+
+int uv__set_process_title(const char* title) {
+  typedef CFTypeRef (*LSGetCurrentApplicationASNType)(void);
+  typedef OSStatus (*LSSetApplicationInformationItemType)(int,
+                                                          CFTypeRef,
+                                                          CFStringRef,
+                                                          CFStringRef,
+                                                          CFDictionaryRef*);
+  CFBundleRef launch_services_bundle;
+  LSGetCurrentApplicationASNType ls_get_current_application_asn;
+  LSSetApplicationInformationItemType ls_set_application_information_item;
+  CFStringRef* display_name_key;
+  ProcessSerialNumber psn;
+  CFTypeRef asn;
+  CFStringRef display_name;
+  OSStatus err;
+
+  launch_services_bundle =
+      CFBundleGetBundleWithIdentifier(CFSTR("com.apple.LaunchServices"));
+
+  if (launch_services_bundle == NULL)
+    return -1;
+
+  ls_get_current_application_asn =
+      CFBundleGetFunctionPointerForName(launch_services_bundle,
+                                        CFSTR("_LSGetCurrentApplicationASN"));
+
+  if (ls_get_current_application_asn == NULL)
+    return -1;
+
+  ls_set_application_information_item =
+      CFBundleGetFunctionPointerForName(launch_services_bundle,
+                                        CFSTR("_LSSetApplicationInformationItem"));
+
+  if (ls_set_application_information_item == NULL)
+    return -1;
+
+  display_name_key = CFBundleGetDataPointerForName(launch_services_bundle,
+                                                   CFSTR("_kLSDisplayNameKey"));
+
+  if (display_name_key == NULL || *display_name_key == NULL)
+    return -1;
+
+  /* Force the process manager to initialize. */
+  GetCurrentProcess(&psn);
+
+  display_name = CFStringCreateWithCString(NULL, title, kCFStringEncodingUTF8);
+  asn = ls_get_current_application_asn();
+  err = ls_set_application_information_item(-2,  /* Magic value. */
+                                            asn,
+                                            *display_name_key,
+                                            display_name,
+                                            NULL);
+
+  return (err == noErr) ? 0 : -1;
+}

src/unix/darwin.c

@@ -261,8 +261,20 @@ char** uv_setup_args(int argc, char** argv) {
 
 
 uv_err_t uv_set_process_title(const char* title) {
-  /* TODO implement me */
-  return uv__new_artificial_error(UV_ENOSYS);
+  int uv__set_process_title(const char*);
+
+  if (process_title != NULL)
+    free(process_title);
+
+  process_title = strdup(title);
+
+  if (process_title == NULL)
+    return uv__new_artificial_error(UV_ENOMEM);
+
+  if (uv__set_process_title(title))
+    return uv__new_artificial_error(UV_ENOSYS);
+
+  return uv_ok_;
 }
 
 

uv.gyp

@@ -158,10 +158,16 @@
           ],
         }],
         [ 'OS=="mac"', {
-          'sources': [ 'src/unix/darwin.c', 'src/unix/fsevents.c' ],
+          'sources': [
+            'src/unix/darwin.c',
+            'src/unix/fsevents.c',
+            'src/unix/darwin-proctitle.m',
+          ],
           'link_settings': {
             'libraries': [
+              '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreServices.framework',
+              '$(SDKROOT)/System/Library/Frameworks/ApplicationServices.framework',
             ],
           },
           'defines': [