int create_mem_file(unsigned long len) 
int create_mem_file(unsigned long long len) 
int create_mem_file(unsigned long len){	int err, fd;	if(have_devanon)		fd = create_anon_file(len);	else fd = create_tmp_file(len);	err = os_set_exec_close(fd, 1);	if(err < 0){		errno = -err;		perror("exec_close");	}	return(fd);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/ae17381608a11781a6a67e0ce51607f36780aac7/mem.c/buggy/arch/um/os-Linux/mem.c