init: cleanup exit() uses

Primarily, this fixes a bug where a forked child of property service
uses exit() instead of _exit, which has the unintended consequences of
running the global destructors of init proper, which leads to
unintended cleanup.

Secondly, this replaces the remaining calls of exit() that really
should be LOG(FATAL).

Test: boot sailfish
Change-Id: I779228e7d44a73186bc7685bb723c4b9278a0a2d

3 files changed, 5 insertions, 9 deletions

diff --git a/init/init.cpp b/init/init.cpp
index 817b33e75..e611f18d5 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -569,8 +569,7 @@ int main(int argc, char** argv) {
 
     epoll_fd = epoll_create1(EPOLL_CLOEXEC);
     if (epoll_fd == -1) {
-        PLOG(ERROR) << "epoll_create1 failed";
-        exit(1);
+        PLOG(FATAL) << "epoll_create1 failed";
     }
 
     sigchld_handler_init();
diff --git a/init/property_service.cpp b/init/property_service.cpp
index db2d47230..0df96bfff 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -73,8 +73,7 @@ static struct selabel_handle* sehandle_prop;
 
 void property_init() {
     if (__system_property_area_init()) {
-        LOG(ERROR) << "Failed to initialize property area";
-        exit(1);
+        LOG(FATAL) << "Failed to initialize property area";
     }
 }
 
@@ -216,7 +215,7 @@ static void PropertyChildLaunch() {
             LOG(ERROR) << "property_set_async(\"" << info.name << "\", \"" << info.value
                        << "\") failed";
         }
-        exit(0);
+        _exit(0);
     }
 }
 
@@ -712,8 +711,7 @@ void start_property_service() {
     property_set_fd = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
                                    false, 0666, 0, 0, nullptr);
     if (property_set_fd == -1) {
-        PLOG(ERROR) << "start_property_service socket creation failed";
-        exit(1);
+        PLOG(FATAL) << "start_property_service socket creation failed";
     }
 
     listen(property_set_fd, 8);
diff --git a/init/sigchld_handler.cpp b/init/sigchld_handler.cpp
index 8fc995606..fa67199ee 100644
--- a/init/sigchld_handler.cpp
+++ b/init/sigchld_handler.cpp
@@ -119,8 +119,7 @@ void sigchld_handler_init() {
     // Create a signalling mechanism for SIGCHLD.
     int s[2];
     if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0, s) == -1) {
-        PLOG(ERROR) << "socketpair failed";
-        exit(1);
+        PLOG(FATAL) << "socketpair failed in sigchld_handler_init";
     }
 
     signal_write_fd = s[0];