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Re: [Qemu-devel] [PATCH] osdep: pass const char pointer to setsockopt


From: Lei Li
Subject: Re: [Qemu-devel] [PATCH] osdep: pass const char pointer to setsockopt
Date: Wed, 06 Mar 2013 21:25:44 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0

On 03/06/2013 09:16 PM, Stefan Hajnoczi wrote:
On Wed, Mar 06, 2013 at 09:07:25PM +0800, Lei Li wrote:
On 03/06/2013 05:56 PM, Stefan Hajnoczi wrote:
On Tue, Mar 05, 2013 at 05:51:21PM +0800, Lei Li wrote:
Pass the right type for setsockopt(), and this will also
fix the compiler warning when cross build for qemu-ga.exe:

util/osdep.c: In function 'socket_set_nodelay':
util/osdep.c:69:5: warning: passing argument 4 of 'setsockopt' from
                    incompatible pointer type [enabled by default]
In file included from /home/lei/qemu_b/include/sysemu/os-win32.h:30:0,
                  from /home/lei/qemu_b/include/qemu-common.h:46,
                  from util/osdep.c:48:
/usr/i686-w64-mingw32/sys-root/mingw/include/winsock2.h:990:63: note:
                  expected 'const char *' but argument is of type 'int *'

Signed-off-by: Lei Li <address@hidden>
---
  util/osdep.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util/osdep.c b/util/osdep.c
index c408261..ce472a9 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -57,7 +57,7 @@ static const char *qemu_version = QEMU_VERSION;
  int socket_set_cork(int fd, int v)
  {
  #if defined(SOL_TCP) && defined(TCP_CORK)
-    return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
+    return setsockopt(fd, SOL_TCP, TCP_CORK, (char *)&v, sizeof(v));
  #else
      return 0;
  #endif
@@ -66,7 +66,7 @@ int socket_set_cork(int fd, int v)
  int socket_set_nodelay(int fd)
  {
      int v = 1;
-    return setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
+    return setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&v, sizeof(v));
Please use qemu_setsockopt() instead of open-coding this.

Stefan

Hi Stefan,

This compiler warning just shows up without any hacking
when cross build qemu-ga for windows by:

./configure --enable-guest-agent --cross-prefix=i686-w64-mingw32-
make qemu-ga.exe
I understand you didn't introduce the bug and noticed it when compiling
for Windows.

The correct fix is still to use qemu_setsockopt() which was added in
order to solve this portability problem.

You don't need any casts if you use qemu_setsockopt().

Stefan

Sorry, I understand it just now...  :-[
Sure, thanks!



--
Lei




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