intercept openat(), too

nocache.c

@@ -10,6 +10,7 @@
 #include <pthread.h>
 
 int (*_original_open)(const char *pathname, int flags, mode_t mode);
+int (*_original_openat)(int dirfd, const char *pathname, int flags, mode_t mode);
 int (*_original_close)(int fd);
 
 void init(void) __attribute__((constructor));
@@ -39,6 +40,8 @@ void init(void)
     int i;
     _original_open = (int (*)(const char *, int, mode_t))
         dlsym(RTLD_NEXT, "open");
+    _original_openat = (int (*)(int, const char *, int, mode_t))
+        dlsym(RTLD_NEXT, "openat");
     _original_close = (int (*)(int)) dlsym(RTLD_NEXT, "close");
     pthread_mutex_init(&lock, NULL);
     PAGESIZE = getpagesize();
@@ -56,6 +59,16 @@ int open(const char *pathname, int flags, mode_t mode)
     return fd;
 }
 
+int openat(int dirfd, const char *pathname, int flags, mode_t mode)
+{
+    int fd;
+    if((fd = _original_openat(dirfd, pathname, flags, mode)) != -1) {
+        store_pageinfo(fd);
+        fadv_noreuse(fd, 0, 0);
+    }
+    return fd;
+}
+
 int close(int fd)
 {
     free_unclaimed_pages(fd);