qemu-file: check exit status when closing a pipe QEMUFile

This is what exec_close does.  Move this to the underlying QEMUFile.
Reviewed-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

include/qemu/osdep.h

@@ -9,6 +9,13 @@
 #include <sys/signal.h>
 #endif
 
+#ifndef _WIN32
+#include <sys/wait.h>
+#else
+#define WIFEXITED(x)   1
+#define WEXITSTATUS(x) (x)
+#endif
+
 #include <sys/time.h>
 
 #if defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10

migration-exec.c

@@ -50,10 +50,6 @@ static int exec_close(MigrationState *s)
     ret = qemu_fclose(s->opaque);
     s->opaque = NULL;
     s->fd = -1;
-    if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) {
-        /* close succeeded, but non-zero exit code: */
-        ret = -EIO; /* fake errno value */
-    }
     return ret;
 }
 

savevm.c

@@ -247,6 +247,9 @@ static int stdio_pclose(void *opaque)
     ret = pclose(s->stdio_file);
     if (ret == -1) {
         ret = -errno;
+    } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
+        /* close succeeded, but non-zero exit code: */
+        ret = -EIO; /* fake errno value */
     }
     g_free(s);
     return ret;