[Qemu-devel] [PULL 03/26] linux-user: Handle TIOCSTART and TIOCSTOP

[Richard Henderson <rth@twiddle.net>]

From: Helge Deller <deller@gmx.de>

Some architectures (ppc, alpha, sparc, parisc, sh and xtensa) define the
BSD TIOCSTART and TIOCSTOP ioctls in their kernel headers to provide
compatibility to other operating systems.

Those ioctls are not implemented in Linux, nevertheless, bash will use
this ioctl if it's available on those architectures.

To avoid false warnings, add code to simply ignore those ioctls.

Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20161206152403.GA6651@ls3530>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 linux-user/ioctls.h  | 5 +++++
 linux-user/syscall.c | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 1bad701..eaf6fe6 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -422,3 +422,8 @@
                 MK_PTR(MK_STRUCT(STRUCT_rtentry)))
   IOCTL_SPECIAL(SIOCDELRT, IOC_W, do_ioctl_rt,
                 MK_PTR(MK_STRUCT(STRUCT_rtentry)))
+
+#ifdef TARGET_TIOCSTART
+  IOCTL_IGNORE(TIOCSTART)
+  IOCTL_IGNORE(TIOCSTOP)
+#endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 7b77503..acb004f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5453,6 +5453,8 @@ static IOCTLEntry ioctl_entries[] = {
     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
 #define IOCTL_SPECIAL(cmd, access, dofn, ...)                      \
     { TARGET_ ## cmd, cmd, #cmd, access, dofn, {  __VA_ARGS__ } },
+#define IOCTL_IGNORE(cmd) \
+    { TARGET_ ## cmd, 0, #cmd },
 #include "ioctls.h"
     { 0, 0, },
 };
@@ -5484,6 +5486,10 @@ static abi_long do_ioctl(int fd, int cmd, abi_long arg)
 #endif
     if (ie->do_ioctl) {
         return ie->do_ioctl(ie, buf_temp, fd, cmd, arg);
+    } else if (!ie->host_cmd) {
+        /* Some architectures define BSD ioctls in their headers
+           that are not implemented in Linux.  */
+        return -TARGET_ENOSYS;
     }
 
     switch(arg_type[0]) {
-- 
2.9.3