Suport TIOCLINUX

The test isn't much of a test since AFAICT it only works when run on an actual console, which no-one is going to do.

Author: rocallahan

src/record_syscall.cc

@@ -1800,6 +1800,10 @@ static Switchable prepare_ioctl(RecordTask* t,
       syscall_state.reg_parameter<typename Arch::termio>(3);
       return PREVENT_SWITCH;
 
+    case TIOCLINUX:
+      syscall_state.reg_parameter<char>(3);
+      return PREVENT_SWITCH;
+
     case BLKSSZGET:
     case BLKALIGNOFF:
     case KDGKBMODE:

src/test/ioctl_pty.c

@@ -2,6 +2,8 @@
 
 #include "util.h"
 
+#include <linux/tiocl.h>
+
 int main(void) {
   int fd = open("/dev/ptmx", O_RDWR);
   pid_t child;
@@ -68,6 +70,13 @@ int main(void) {
   atomic_printf("pty TIOCGETD = %d\n", *arg);
   test_assert(0 == ioctl(fd, TIOCSETD, arg));
 
+  char* carg;
+  ALLOCATE_GUARD(carg, 'f');
+  *carg = TIOCL_GETSHIFTSTATE;
+  ret = ioctl(fd, TIOCLINUX, carg);
+  VERIFY_GUARD(carg);
+  test_assert(ret == 0 || errno == EIO || errno == ENOTTY);
+
   atomic_puts("EXIT-SUCCESS");
   return 0;
 }