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virsh: Fix job watching when STDIN is not a tty

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In commit b46c4787dd I changed the code to
watch long running jobs in virsh. Unfortunately I didn't take into
account that poll may get a hangup if the terminal is not a TTY and will
be closed.

This patch avoids polling the STDIN fd when there's no TTY.
This commit is contained in:
Peter Krempa
2013-10-22 15:01:26 +01:00
parent dc33207dbe
commit 47e6396651
3 changed files with 15 additions and 1 deletions
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7
tools/virsh-domain.c
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@@ -3529,6 +3529,7 @@ vshWatchJob(vshControl *ctl,
bool functionReturn = false;
sigset_t sigmask, oldsigmask;
bool jobStarted = false;
nfds_t npollfd = 2;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGINT);
@@ -3539,9 +3540,13 @@ vshWatchJob(vshControl *ctl,
sigemptyset(&sig_action.sa_mask);
sigaction(SIGINT, &sig_action, &old_sig_action);
/* don't poll on STDIN if we are not using a terminal */
if (!vshTTYAvailable(ctl))
npollfd = 1;
GETTIMEOFDAY(&start);
while (1) {
ret = poll((struct pollfd *)&pollfd, 2, 500);
ret = poll((struct pollfd *)&pollfd, npollfd, 500);
if (ret > 0) {
if (pollfd[1].revents & POLLIN &&
saferead(STDIN_FILENO, &retchar, sizeof(retchar)) > 0) {