Re: [Qemu-devel] [PATCH 2/3] slirp: fix warning on mingw32

[Blue Swirl]

On Sun, Jul 24, 2011 at 1:23 AM, Anthony Liguori <address@hidden> wrote:
> On 07/23/2011 04:25 PM, Blue Swirl wrote:
>>
>> Avoid this warning:
>>   CC    slirp/ip_icmp.o
>> /src/qemu/slirp/ip_icmp.c: In function 'icmp_receive':
>> /src/qemu/slirp/ip_icmp.c:418:5: error: passing argument 2 of 'recv'
>> from incompatible pointer type [-Werror]
>>
>> /usr/local/lib/gcc/i686-mingw32msvc/4.6.0/../../../../i686-mingw32msvc/include/winsock2.h:547:32:
>> note: expected 'char *' but argument is of type 'struct icmp *'
>>
>> Signed-off-by: Blue Swirl<address@hidden>
>> ---
>>  slirp/ip_icmp.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
>> index 14a5312..a208648 100644
>> --- a/slirp/ip_icmp.c
>> +++ b/slirp/ip_icmp.c
>> @@ -415,7 +415,7 @@ void icmp_receive(struct socket *so)
>>      icp = mtod(m, struct icmp *);
>>
>>      id = icp->icmp_id;
>> -    len = recv(so->s, icp, m->m_len, 0);
>> +    len = recv(so->s, (char *)icp, m->m_len, 0);
>
> (char *) is wrong.  recv() takes a void *.
>
> Maybe we need to introduce a qemu_recv?

That way the casts can be eliminated though the patch is bigger.
Here's an updated patch.

commit 0cb8b1796728eb722098c75127bbfd133d7dc58d
Author: Blue Swirl <address@hidden>
Date:   Sat Jul 23 20:04:29 2011 +0000

    Wrap recv to avoid warnings

    Avoid warnings like these by wrapping recv():
      CC    slirp/ip_icmp.o
    /src/qemu/slirp/ip_icmp.c: In function 'icmp_receive':
    /src/qemu/slirp/ip_icmp.c:418:5: error: passing argument 2 of
'recv' from incompatible pointer type [-Werror]
    
/usr/local/lib/gcc/i686-mingw32msvc/4.6.0/../../../../i686-mingw32msvc/include/winsock2.h:547:32:
note: expected 'char *' but argument is of type 'struct icmp *'

    Remove also casts used to avoid warnings.

    Signed-off-by: Blue Swirl <address@hidden>

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 77a4de5..e150ac0 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -496,7 +496,7 @@ static ssize_t recvmsg(int s, struct msghdr *msg, int flags)
     }
     buf = qemu_malloc(size);

-    ret = recv(s, buf, size, flags);
+    ret = qemu_recv(s, buf, size, flags);
     if (ret < 0) {
         goto out;
     }
diff --git a/gdbstub.c b/gdbstub.c
index c085a5a..27b0cfa 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -319,7 +319,7 @@ static int get_char(GDBState *s)
     int ret;

     for(;;) {
-        ret = recv(s->fd, &ch, 1, 0);
+        ret = qemu_recv(s->fd, &ch, 1, 0);
         if (ret < 0) {
             if (errno == ECONNRESET)
                 s->fd = -1;
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 1dd7aad..73f9baa 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -2004,7 +2004,7 @@ static abi_long do_recvfrom(int fd, abi_ulong
msg, size_t len, int flags,
         ret = get_errno(recvfrom(fd, host_msg, len, flags, addr, &addrlen));
     } else {
         addr = NULL; /* To keep compiler quiet.  */
-        ret = get_errno(recv(fd, host_msg, len, flags));
+        ret = get_errno(qemu_recv(fd, host_msg, len, flags));
     }
     if (!is_error(ret)) {
         if (target_addr) {
diff --git a/nbd.c b/nbd.c
index 0dcd86b..e7a585d 100644
--- a/nbd.c
+++ b/nbd.c
@@ -78,7 +78,7 @@ size_t nbd_wr_sync(int fd, void *buffer, size_t
size, bool do_read)
         ssize_t len;

         if (do_read) {
-            len = recv(fd, buffer + offset, size - offset, 0);
+            len = qemu_recv(fd, buffer + offset, size - offset, 0);
         } else {
             len = send(fd, buffer + offset, size - offset, 0);
         }
diff --git a/net/socket.c b/net/socket.c
index bc1bf58..11fe5f3 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -76,7 +76,7 @@ static void net_socket_send(void *opaque)
     uint8_t buf1[4096];
     const uint8_t *buf;

-    size = recv(s->fd, (void *)buf1, sizeof(buf1), 0);
+    size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
     if (size < 0) {
         err = socket_error();
         if (err != EWOULDBLOCK)
@@ -138,7 +138,7 @@ static void net_socket_send_dgram(void *opaque)
     NetSocketState *s = opaque;
     int size;

-    size = recv(s->fd, (void *)s->buf, sizeof(s->buf), 0);
+    size = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0);
     if (size < 0)
         return;
     if (size == 0) {
diff --git a/qemu-char.c b/qemu-char.c
index 2982bfd..8e8cf31 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -1860,7 +1860,7 @@ static void udp_chr_read(void *opaque)

     if (s->max_size == 0)
         return;
-    s->bufcnt = recv(s->fd, (void *)s->buf, sizeof(s->buf), 0);
+    s->bufcnt = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0);
     s->bufptr = s->bufcnt;
     if (s->bufcnt <= 0)
         return;
@@ -2078,7 +2078,7 @@ static ssize_t tcp_chr_recv(CharDriverState
*chr, char *buf, size_t len)
 static ssize_t tcp_chr_recv(CharDriverState *chr, char *buf, size_t len)
 {
     TCPCharDriver *s = chr->opaque;
-    return recv(s->fd, buf, len, 0);
+    return qemu_recv(s->fd, buf, len, 0);
 }
 #endif

diff --git a/qemu-common.h b/qemu-common.h
index ba55719..391fadd 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -200,6 +200,12 @@ int qemu_eventfd(int pipefd[2]);
 int qemu_pipe(int pipefd[2]);
 #endif

+#ifdef _WIN32
+#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf,
len, flags)
+#else
+#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
+#endif
+
 /* Error handling.  */

 void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
diff --git a/savevm.c b/savevm.c
index 8139bc7..79db4cb 100644
--- a/savevm.c
+++ b/savevm.c
@@ -194,7 +194,7 @@ static int socket_get_buffer(void *opaque, uint8_t
*buf, int64_t pos, int size)
     ssize_t len;

     do {
-        len = recv(s->fd, (void *)buf, size, 0);
+        len = qemu_recv(s->fd, buf, size, 0);
     } while (len == -1 && socket_error() == EINTR);

     if (len == -1)
diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
index 14a5312..4b43994 100644
--- a/slirp/ip_icmp.c
+++ b/slirp/ip_icmp.c
@@ -415,7 +415,7 @@ void icmp_receive(struct socket *so)
     icp = mtod(m, struct icmp *);

     id = icp->icmp_id;
-    len = recv(so->s, icp, m->m_len, 0);
+    len = qemu_recv(so->s, icp, m->m_len, 0);
     icp->icmp_id = id;

     m->m_data -= hlen;
diff --git a/slirp/slirp.c b/slirp/slirp.c
index faaa2f3..df787ea 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -522,7 +522,7 @@ void slirp_select_poll(fd_set *readfds, fd_set
*writefds, fd_set *xfds,
                         */
 #ifdef PROBE_CONN
                        if (so->so_state & SS_ISFCONNECTING) {
-                         ret = recv(so->s, (char *)&ret, 0,0);
+                          ret = qemu_recv(so->s, &ret, 0,0);

                          if (ret < 0) {
                            /* XXX */
diff --git a/slirp/socket.c b/slirp/socket.c
index 9b8ae13..77b0c98 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -166,7 +166,7 @@ soread(struct socket *so)
        nn = readv(so->s, (struct iovec *)iov, n);
        DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 #else
-       nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
+       nn = qemu_recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 #endif
        if (nn <= 0) {
                if (nn < 0 && (errno == EINTR || errno == EAGAIN))
@@ -191,7 +191,7 @@ soread(struct socket *so)
         */
        if (n == 2 && nn == iov[0].iov_len) {
             int ret;
-            ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
+            ret = qemu_recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
             if (ret > 0)
                 nn += ret;
         }
diff --git a/ui/vnc-tls.c b/ui/vnc-tls.c
index dec626c..31f1467 100644
--- a/ui/vnc-tls.c
+++ b/ui/vnc-tls.c
@@ -89,7 +89,7 @@ static ssize_t vnc_tls_pull(gnutls_transport_ptr_t transport,
     int ret;

  retry:
-    ret = recv(vs->csock, data, len, 0);
+    ret = qemu_recv(vs->csock, data, len, 0);
     if (ret < 0) {
         if (errno == EINTR)
             goto retry;
diff --git a/ui/vnc.c b/ui/vnc.c
index 4425180..f1e27d9 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1199,7 +1199,7 @@ long vnc_client_read_buf(VncState *vs, uint8_t
*data, size_t datalen)
         }
     } else
 #endif /* CONFIG_VNC_TLS */
-        ret = recv(vs->csock, (void *)data, datalen, 0);
+        ret = qemu_recv(vs->csock, data, datalen, 0);
     VNC_DEBUG("Read wire %p %zd -> %ld\n", data, datalen, ret);
     return vnc_client_io_error(vs, ret, socket_error());
 }

0002-Wrap-recv-to-avoid-warnings.patch
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