tests/boot-serial-test: Make sure that we check the timeout regularly

If the guest continuesly writes characters to the UART, we never leave
the inner while loop and thus never check whether we've reached the
timeout value. So if we fail to find the expected string in the UART
output, the test just hangs and never finishs. Use a counter to regularly
break out of the while loop to check the timeout.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1512031988-32490-2-git-send-email-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tests/boot-serial-test.c b/tests/boot-serial-test.c
index c935d69824bda59f2f0888e70cba5a8da5d63a2c..fa4183de290685483d339df08c8063e30f12ad63 100644 (file)
--- a/tests/boot-serial-test.c
+++ b/tests/boot-serial-test.c
@@ -43,12 +43,13 @@ static testdef_t tests[] = {
 static void check_guest_output(const testdef_t *test, int fd)
 {
     bool output_ok = false;
-    int i, nbr, pos = 0;
+    int i, nbr, pos = 0, ccnt;
     char ch;
 
     /* Poll serial output... Wait at most 60 seconds */
     for (i = 0; i < 6000; ++i) {
-        while ((nbr = read(fd, &ch, 1)) == 1) {
+        ccnt = 0;
+        while ((nbr = read(fd, &ch, 1)) == 1 && ccnt++ < 512) {
             if (ch == test->expect[pos]) {
                 pos += 1;
                 if (test->expect[pos] == '\0') {