JUMP0
#define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
#define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
#define _IO_SYNC(FP) JUMP0 (__sync, FP)
#define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
#define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
#define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)