+ sigset_t sigchld;
+ sigemptyset(&sigchld);
+ sigaddset(&sigchld, SIGCHLD);
+
+ // Temporarily block SIGCHLD during forks. The SIGCHLD handler might
+ // log, which would result in the logging FDs we close being reopened.
+ // This would cause failures because the FDs are not whitelisted.
+ //
+ // Note that the zygote process is single threaded at this point.
+ if (sigprocmask(SIG_BLOCK, &sigchld, NULL) == -1) {
+ ALOGE("sigprocmask(SIG_SETMASK, { SIGCHLD }) failed: %s", strerror(errno));
+ RuntimeAbort(env, __LINE__, "Call to sigprocmask(SIG_BLOCK, { SIGCHLD }) failed.");
+ }
+
+ // Close any logging related FDs before we start evaluating the list of
+ // file descriptors.
+ __android_log_close();
+
+ // If this is the first fork for this zygote, create the open FD table.
+ // If it isn't, we just need to check whether the list of open files has
+ // changed (and it shouldn't in the normal case).
+ if (gOpenFdTable == NULL) {
+ gOpenFdTable = FileDescriptorTable::Create();
+ if (gOpenFdTable == NULL) {
+ RuntimeAbort(env, __LINE__, "Unable to construct file descriptor table.");
+ }
+ } else if (!gOpenFdTable->Restat()) {
+ RuntimeAbort(env, __LINE__, "Unable to restat file descriptor table.");
+ }
+