linux-kernel - Re: RFC: implement daemon() in the kernel

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Message-ID: <4563342B.9050500@zytor.com>
Date:	Tue, 21 Nov 2006 09:15:23 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Michal Schmidt <xschmi00@...d.feec.vutbr.cz>
CC:	Simon Richter <Simon.Richter@...yros.de>,
	linux-kernel@...r.kernel.org
Subject: Re: RFC: implement daemon() in the kernel

Michal Schmidt wrote:
> H. Peter Anvin wrote:
>> Simon Richter wrote:
>>> int daemon(int nochdir, int noclose)
>>> {
>>>     if(!nochdir)
>>>         chdir("/");
>>>
>>>     if(!noclose)
>>>     {
>>>         int fd = open("/dev/null", O_RDWR);
>>>         dup2(fd, 0);
>>>         dup2(fd, 1);
>>>         dup2(fd, 2);
>>>         close(fd);
>>>     }
>>>
>>>     if(fork() > 0)
>>
>> ... that should be if (fork() == 0) ...
> 
> Are you sure? fork()==0 means we're the child, but it's the parent who 
> should exit, isn't it?
> 

Oh, right, of course.  Thinko; the lack of error handling confused me. 
I did that right in the assembly code.

	-hpa
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