From: Razvan Cojocaru <rcojocaru@bitdefender.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: stefano.stabellini@eu.citrix.com, ian.jackson@eu.citrix.com,
xen-devel@lists.xen.org
Subject: Re: [PATCH] tools/xenstore-watch: Add new timeout parameter
Date: Wed, 16 Mar 2016 20:52:57 +0200 [thread overview]
Message-ID: <56E9AB89.6010404@bitdefender.com> (raw)
In-Reply-To: <20160316184650.GJ22103@citrix.com>
On 03/16/2016 08:46 PM, Wei Liu wrote:
> On Wed, Mar 16, 2016 at 05:50:46PM +0200, Razvan Cojocaru wrote:
> [...]
>> }
>>
>> @@ -273,27 +274,49 @@ do_chmod(char *path, struct xs_permissions *perms, int nperms, int upto,
>> }
>>
>> static void
>> -do_watch(struct xs_handle *xsh, int max_events)
>> +do_watch(struct xs_handle *xsh, int max_events, int timeout)
>> {
>> - int count = 0;
>> + int rc, ms_timeout = timeout * 1000;
>> char **vec = NULL;
>> + struct pollfd fd;
>>
>> - for ( count = 0; max_events == -1 || count < max_events; count++ ) {
>> - unsigned int num;
>> + fd.fd = xs_fileno(xsh);
>> + fd.events = POLLIN | POLLERR;
>>
>> - vec = xs_read_watch(xsh, &num);
>> - if (vec == NULL)
>> - continue;
>> + do {
>> + rc = poll(&fd, 1, 100);
>>
>> - printf("%s\n", vec[XS_WATCH_PATH]);
>> - fflush(stdout);
>> - free(vec);
>> - }
>> + if (rc == 0 || (rc < 0 && errno == EINTR)) {
>> + ms_timeout -= 100;
>
> Shouldn't you just exit the loop when getting EINTR?
I don't think so, an EINTR means that a signal has been caught during
poll() - it's not really a failure case.
> And as others have mentioned, please also patch manpage.
As Andrew has pointed out, there is no man page to patch. I agree that
adding one would be great, but I hope this patch can get through without
it being required - it can be added later.
Thanks,
Razvan
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next prev parent reply other threads:[~2016-03-16 18:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-16 15:50 [PATCH] tools/xenstore-watch: Add new timeout parameter Razvan Cojocaru
2016-03-16 17:43 ` Konrad Rzeszutek Wilk
2016-03-16 17:50 ` Andrew Cooper
2016-03-16 18:46 ` Wei Liu
2016-03-16 18:52 ` Razvan Cojocaru [this message]
2016-03-16 18:57 ` Wei Liu
2016-03-16 19:06 ` Razvan Cojocaru
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