FOPEN_MAX
_INT("stream_max", USER_STREAM_MAX, FOPEN_MAX,
n = (int)sysconf(_SC_OPEN_MAX) - FOPEN_MAX + 20; /* 20 for slop. */
for (i = 0; i < FOPEN_MAX - 3; i++)
static FILE usual[FOPEN_MAX - 3];
static struct __sfileext usualext[FOPEN_MAX - 3];
static struct glue uglue = { 0, FOPEN_MAX - 3, usual };