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Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a spec
From: |
Michael Tokarev |
Subject: |
Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case |
Date: |
Fri, 31 Oct 2014 11:02:25 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.8.1 |
31.10.2014 10:58, Gonglei wrote:
> On 2014/10/31 15:41, Michael Tokarev wrote:
[]
>>>>>> + exit(len == 1 && status == 0 ? 0 : 1);
>>>>
>>>> ...it is checked here, note the 'len == 1' part of the condition.
>>>
>>> If len != 1, the original code exit with 1, after your changes,
>>> it will exit with 0. Right?
>>
>> with len != 1, the condition 'len == 1 && status == 0 ? 0 : 1'
>
> Ok. That's will be great if you can modify it
> to "(len == 1 && status == 0 ) ? 0 : 1"
Well, ? operator has lowest precedence in C, && and || is higher,
and == is even higher. That's the basic rules of the language.
So I don't really see why... ;)
The comment however should clear all confusion, hopefully.
>> evaluates to 1. Maybe I can add a comment here:
>>
>
>> + /* only exit successfully if our child actually
>> + * wrote a one-byte zero to our pipe */
>> + exit(len == 1 && status == 0 ? 0 : 1);
>>
>> See the result at
>> http://git.corpit.ru/?p=qemu.git;a=shortlog;h=refs/heads/trivial-patches-next
- [Qemu-trivial] [PATCH 0/4] cleanup -daemonize and pidfile creation a bit, Michael Tokarev, 2014/10/31
- [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Michael Tokarev, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Gonglei, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Michael Tokarev, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Gonglei, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Michael Tokarev, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Gonglei, 2014/10/31
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case,
Michael Tokarev <=
- Re: [Qemu-trivial] [PATCH 3/4] pidfile: stop making pidfile error a special case, Gonglei, 2014/10/31
[Qemu-trivial] [PATCH 1/4] os-posix: use global daemon_pipe instead of cryptic fds[1], Michael Tokarev, 2014/10/31
[Qemu-trivial] [PATCH 4/4] os-posix: reorder parent notification for -daemonize, Michael Tokarev, 2014/10/31
[Qemu-trivial] [PATCH 2/4] os-posix: replace goto again with a proper loop, Michael Tokarev, 2014/10/31