[1/3] create socket_set_reuseaddr()

diff --git a/gdbstub.c b/gdbstub.c
index 1e9f931..b12e20e 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -2591,7 +2591,7 @@  static void gdb_accept(void)
 static int gdbserver_open(int port)
 {
     struct sockaddr_in sockaddr;
-    int fd, val, ret;
+    int fd, ret;

     fd = socket(PF_INET, SOCK_STREAM, 0);
     if (fd < 0) {
@@ -2602,9 +2602,7 @@  static int gdbserver_open(int port)
     fcntl(fd, F_SETFD, FD_CLOEXEC);
 #endif

-    /* allow fast reuse */
-    val = 1;
-    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
+    socket_set_reuseaddr(fd);

     sockaddr.sin_family = AF_INET;
     sockaddr.sin_port = htons(port);
diff --git a/migration-tcp.c b/migration-tcp.c
index b55f419..2340b55 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -172,7 +172,6 @@  out2:
 int tcp_start_incoming_migration(const char *host_port)
 {
     struct sockaddr_in addr;
-    int val;
     int s;

     if (parse_host_port(&addr, host_port) < 0) {
@@ -184,8 +183,7 @@  int tcp_start_incoming_migration(const char *host_port)
     if (s == -1)
         return -socket_error();

-    val = 1;
-    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
+    socket_set_reuseaddr(s);

     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
         goto err;
diff --git a/nbd.c b/nbd.c
index d8ebc42..3ecc792 100644
--- a/nbd.c
+++ b/nbd.c
@@ -148,7 +148,6 @@  int tcp_socket_incoming(const char *address, uint16_t port)
     int s;
     struct in_addr in;
     struct sockaddr_in addr;
-    int opt;

     s = socket(PF_INET, SOCK_STREAM, 0);
     if (s == -1) {
@@ -170,9 +169,7 @@  int tcp_socket_incoming(const char *address, uint16_t port)
     addr.sin_port = htons(port);
     memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));

-    opt = 1;
-    if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
-                   (const void *) &opt, sizeof(opt)) == -1) {
+    if (socket_set_reuseaddr(s)) {
         goto error;
     }

diff --git a/net/socket.c b/net/socket.c
index 7337f4f..de46506 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -167,11 +167,9 @@  static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr
         return -1;
     }

-    val = 1;
-    ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
-                   (const char *)&val, sizeof(val));
+    ret = socket_set_reuseaddr(fd);
     if (ret < 0) {
-	perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
+	perror("socket_set_reuseaddr");
 	goto fail;
     }

@@ -392,7 +390,7 @@  static int net_socket_listen_init(VLANState *vlan,
                                   const char *host_str)
 {
     NetSocketListenState *s;
-    int fd, val, ret;
+    int fd, ret;
     struct sockaddr_in saddr;

     if (parse_host_port(&saddr, host_str) < 0)
@@ -406,10 +404,7 @@  static int net_socket_listen_init(VLANState *vlan,
         return -1;
     }
     socket_set_nonblock(fd);
-
-    /* allow fast reuse */
-    val = 1;
-    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
+    socket_set_reuseaddr(fd);

     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
     if (ret < 0) {
diff --git a/os-posix.c b/os-posix.c
index 38c29d1..e7116c7 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -382,3 +382,4 @@  int qemu_create_pidfile(const char *filename)

     return 0;
 }
+
diff --git a/oslib-posix.c b/oslib-posix.c
index 7bc5f7c..2f3383a 100644
--- a/oslib-posix.c
+++ b/oslib-posix.c
@@ -72,6 +72,14 @@  void qemu_vfree(void *ptr)
     free(ptr);
 }

+int  socket_set_reuseaddr(int fd)
+{
+    int val = 1;
+    /* allow fast reuse */
+    return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val,
+                      sizeof(val));
+}
+
 void socket_set_nonblock(int fd)
 {
     int f;
diff --git a/oslib-win32.c b/oslib-win32.c
index 5f0759f..1641e1f 100644
--- a/oslib-win32.c
+++ b/oslib-win32.c
@@ -79,6 +79,12 @@  void socket_set_nonblock(int fd)
     ioctlsocket(fd, FIONBIO, &opt);
 }

+int socket_set_reuseaddr(int fd)
+{
+    /* Nothing, this is the default windows behaviour */
+    return 0;
+}
+
 int inet_aton(const char *cp, struct in_addr *ia)
 {
     uint32_t addr = inet_addr(cp);
diff --git a/qemu-sockets.c b/qemu-sockets.c
index c526324..293dad6 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -168,7 +168,7 @@  int inet_listen_opts(QemuOpts *opts, int port_offset)
             continue;
         }

-        setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
+        socket_set_reuseaddr(slisten);
 #ifdef IPV6_V6ONLY
         if (e->ai_family == PF_INET6) {
             /* listen on both ipv4 and ipv6 */
@@ -265,7 +265,7 @@  int inet_connect_opts(QemuOpts *opts)
             inet_strfamily(e->ai_family), strerror(errno));
             continue;
         }
-        setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
+        socket_set_reuseaddr(sock);

         /* connect to peer */
         if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) {
@@ -358,7 +358,7 @@  int inet_dgram_opts(QemuOpts *opts)
                 inet_strfamily(peer->ai_family), strerror(errno));
         goto err;
     }
-    setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
+    socket_set_reuseaddr(sock);

     /* bind socket */
     if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen,
diff --git a/qemu_socket.h b/qemu_socket.h
index 180e4db..f9a7f95 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -36,6 +36,7 @@  int inet_aton(const char *cp, struct in_addr *ia);
 int qemu_socket(int domain, int type, int protocol);
 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen);
 void socket_set_nonblock(int fd);
+int socket_set_reuseaddr(int fd);
 int send_all(int fd, const void *buf, int len1);

 /* New, ipv6-ready socket helper functions, see qemu-sockets.c */
diff --git a/tests/linux-test.c b/tests/linux-test.c
index 2e4a746..2635d64 100644
--- a/tests/linux-test.c
+++ b/tests/linux-test.c
@@ -283,9 +283,7 @@  int server_socket(void)

     /* server socket */
     fd = chk_error(socket(PF_INET, SOCK_STREAM, 0));
-
-    val = 1;
-    chk_error(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)));
+    chk_error(socket_set_reuseaddr(fd));

     sockaddr.sin_family = AF_INET;
     sockaddr.sin_port = htons(TESTPORT);