getc_unlocked
extern int getc_unlocked(FILE *stream);
(_single_threaded ? getc_unlocked(stream) : getc(stream))
# define getc getc_unlocked
#undef getc_unlocked
weak_alias (_IO_getc, getc_unlocked)
weak_alias (__getc_unlocked, getc_unlocked)
extern int getc_unlocked (FILE *__stream);