Add TIOCMGET/TIOCMSET ioctl.

Author: bernhardu

CMakeLists.txt

@@ -1141,6 +1141,7 @@ set(BASIC_TESTS
   ioctl_pty
   ioctl_sg
   ioctl_tty
+  ioctl_ttyS
   ioctl_vt
   ioprio
   x86/ioperm

src/record_syscall.cc

@@ -1800,6 +1800,8 @@ static Switchable prepare_ioctl(RecordTask* t,
     case TIOCINQ: // == FIONREAD
     case TIOCOUTQ:
     case TIOCGETD:
+    case TIOCMGET:
+    case TIOCMSET:
     case VT_OPENQRY:
       syscall_state.reg_parameter<int>(3);
       return PREVENT_SWITCH;

src/test/ioctl_ttyS.c

@@ -0,0 +1,25 @@
+/* -*- Mode: C; tab-width: 8; c-basic-offset: 2; indent-tabs-mode: nil; -*- */
+
+#include "util.h"
+
+int main(void) {
+  int fd;
+  int* mbits;
+
+  fd = open("/dev/ttyS0", O_RDWR);
+  if (fd < 0) {
+    atomic_puts("Can't open ttyS0, aborting test");
+    atomic_puts("EXIT-SUCCESS");
+    return 0;
+  }
+
+  ALLOCATE_GUARD(mbits, 'a');
+  test_assert(0 == ioctl(fd, TIOCMGET, mbits));
+  VERIFY_GUARD(mbits);
+  atomic_printf("TIOCMGET returned mbits=0x%x\n", *mbits);
+  test_assert(0 == ioctl(fd, TIOCMSET, mbits));
+  atomic_printf("TIOCMSET mbits=0x%x afterwards\n", *mbits);
+
+  atomic_puts("EXIT-SUCCESS");
+  return 0;
+}