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Check that QEMU is still alive while reading startup output.

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By checking the pid every retry period, we can quickly determine if
the process crashed at startup, rather than make the user wait for
the entire timeout (3 seconds).
This commit is contained in:
Cole Robinson 2009-05-11 13:52:31 +00:00
parent a331653dad
commit 0c8a9d2d51
2 changed files with 27 additions and 11 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Mon May 11 09:51:00 EDT 2009 Cole Robinson <crobinso@redhat.com>
* src/qemu_driver.c : Check that QEMU is still alive while
reading startup output.
Mon May 11 09:44:40 EDT 2009 Cole Robinson <crobinso@redhat.com>
* src/util.[ch] : Add pidfile argument to __virExec

33
src/qemu_driver.c
View File

@ -744,29 +744,40 @@ qemudReadLogOutput(virConnectPtr conn,
int timeout)
{
int retries = timeout*10;
int got = 0;
buf[0] = '\0';
while (retries) {
ssize_t ret;
size_t got = 0;
int isdead = 0;
while((ret = read(fd, buf+got, buflen-got-1)) > 0) {
got += ret;
buf[got] = '\0';
if ((buflen-got-1) == 0) {
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("Out of space while reading %s log output"), what);
return -1;
}
}
if (kill(vm->pid, 0) == -1 && errno == ESRCH)
isdead = 1;
if (ret < 0 && errno != EINTR) {
ret = saferead(fd, buf+got, buflen-got-1);
if (ret < 0) {
virReportSystemError(conn, errno,
_("Failure while reading %s log output"),
what);
return -1;
}
got += ret;
buf[got] = '\0';
if (got == buflen-1) {
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("Out of space while reading %s log output"),
what);
return -1;
}
if (isdead) {
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("Process exited while reading %s log output"),
what);
return -1;
}
ret = func(conn, vm, buf, fd);
if (ret <= 0)
return ret;