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

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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>
This commit is contained in:
Thomas Huth 2017-11-30 09:53:02 +01:00 committed by Paolo Bonzini
parent cfcca361d7
commit 92b540dac9
1 changed files with 3 additions and 2 deletions
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5
tests/boot-serial-test.c
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@ -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') {