putc_unlocked
int putc_unlocked(int, FILE *);
#define putchar_unlocked(c) putc_unlocked(c, stdout)
PROTO_NORMAL(putc_unlocked);
DEF_WEAK(putc_unlocked);
ret = putc_unlocked(c, fp);
return (putc_unlocked(c,so));
TEST_NARROW(putc_unlocked('c', f));