Add TIOCSERGETLSR ioctl.

Author: bernhardu

src/record_syscall.cc

@@ -1802,6 +1802,7 @@ static Switchable prepare_ioctl(RecordTask* t,
     case TIOCGETD:
     case TIOCMGET:
     case TIOCMSET:
+    case TIOCSERGETLSR:
     case VT_OPENQRY:
       syscall_state.reg_parameter<int>(3);
       return PREVENT_SWITCH;

src/test/ioctl_ttyS.c

@@ -7,6 +7,7 @@ int main(void) {
   int fd;
   int* mbits;
   struct serial_icounter_struct* sicnt;
+  int* lsr;
 
   fd = open("/dev/ttyS0", O_RDWR);
   if (fd < 0) {
@@ -29,6 +30,11 @@ int main(void) {
                 sicnt->cts, sicnt->dsr, sicnt->rng, sicnt->dcd, sicnt->rx, sicnt->tx,
                 sicnt->frame, sicnt->overrun, sicnt->parity, sicnt->brk, sicnt->buf_overrun);
 
+  ALLOCATE_GUARD(lsr, 'c');
+  test_assert(0 == ioctl(fd, TIOCSERGETLSR, lsr));
+  VERIFY_GUARD(lsr);
+  atomic_printf("TIOCSERGETLSR returned lsr=0x%x\n", *lsr);
+
   atomic_puts("EXIT-SUCCESS");
   return 0;
 }