Mktemp create unique temporary file name char *mktemp char *name Mktemp may be used to ensure that the name of a temporary file is unique in the system and does not clash with any other file name. "Name" must point to a string whose last five characters are "X"; the Xs will be replaced with the ascii representation of the task id. For example, if "name" points to "foo.XXXXX", and the task id is 351, the returned value points at the same place, but it now holds "foo.351". System call getpid()