Merge "Log the errno if calling fork() fails" am: d84afeb673 am: 9bd0d906b4

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2165856

Change-Id: Ib6b09bcdb5b60ea00525de993ba935b67b3f577c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

core/jni/com_android_internal_os_Zygote.cpp

@@ -2127,6 +2127,8 @@ pid_t zygote::ForkCommon(JNIEnv* env, bool is_system_server,
 
     // Reset the fd to the unsolicited zygote socket
     gSystemServerSocketFd = -1;
+  } else if (pid == -1) {
+    ALOGE("Failed to fork child process: %s (%d)", strerror(errno), errno);
   } else {
     ALOGD("Forked child process %d", pid);
   }