qemu-ga: make reopen_fd_to_null() public

The next commit wants to use it.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>

qemu-ga.c

@@ -140,6 +140,23 @@ static gboolean register_signal_handlers(void)
 
     return true;
 }
+
+/* TODO: use this in place of all post-fork() fclose(std*) callers */
+void reopen_fd_to_null(int fd)
+{
+    int nullfd;
+
+    nullfd = open("/dev/null", O_RDWR);
+    if (nullfd < 0) {
+        return;
+    }
+
+    dup2(nullfd, fd);
+
+    if (nullfd != fd) {
+        close(nullfd);
+    }
+}
 #endif
 
 static void usage(const char *cmd)

qga/commands-posix.c

@@ -34,25 +34,6 @@
 #endif
 #endif
 
-#if defined(__linux__)
-/* TODO: use this in place of all post-fork() fclose(std*) callers */
-static void reopen_fd_to_null(int fd)
-{
-    int nullfd;
-
-    nullfd = open("/dev/null", O_RDWR);
-    if (nullfd < 0) {
-        return;
-    }
-
-    dup2(nullfd, fd);
-
-    if (nullfd != fd) {
-        close(nullfd);
-    }
-}
-#endif /* defined(__linux__) */
-
 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
 {
     int ret;

qga/guest-agent-core.h

@@ -35,3 +35,7 @@ void ga_set_response_delimited(GAState *s);
 bool ga_is_frozen(GAState *s);
 void ga_set_frozen(GAState *s);
 void ga_unset_frozen(GAState *s);
+
+#ifndef _WIN32
+void reopen_fd_to_null(int fd);
+#endif