fopen64(“/home/jeffrin/.netrc”, “r”) = 0 The fopen64() function is identical to the fopen() function except that the underlying file descriptor is created with the O_LARGEFILE flag set. The fopen64() function is a part of the large-file extensions. http://coding.derkeiler.com/Archive/C_CPP/comp.lang.c/2008-07/msg00256.html