libc: add <sys/eventfd.h> and corresponding implementations.
Change-Id: Ide040884c456190226e580513099fdb8377e015b
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index a1905b3..23853da 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -202,6 +202,7 @@
int inotify_add_watch (int, const char *, unsigned int);
int inotify_rm_watch (int, unsigned int);
int poll (struct pollfd *, unsigned int, long);
+int eventfd (unsigned int, int);
int __set_tls (void*);
int cacheflush (long start, long end, long flags);
#ifdef __cplusplus