linux-kernel - Re: [PATCH 2/2] ptrace_vm: ptrace for syscall emulation virtual machines

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Message-ID: <20090310220241.GC30475@elte.hu>
Date:	Tue, 10 Mar 2009 23:02:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Renzo Davoli <renzo@...unibo.it>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] ptrace_vm: ptrace for syscall emulation virtual
	machines


* Renzo Davoli <renzo@...unibo.it> wrote:

> +/* test thread code. This thread is started only to test 
> + * which features are provided by the linux kernel */
> +static int sysptvm_child(void *arg)
> +{
> +	int *featurep=arg;
> +	int p[2]={-1,-1};
> +	pid_t pid=os_getpid();
> +	if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
> +		perror("ptrace test_ptracemulti");
> +		kill(pid, SIGKILL);
> +	}
> +	kill(pid, SIGSTOP);
> +	*featurep=0;
> +	os_getpid();
> +	/* if it reaches this point in 1 stop it means that
> +	 * PTRACE_SYSCALL_SKIPEXIT works */
> +	*featurep=PTRACE_SYSCALL_SKIPEXIT;
> +	pipe(p);
> +	/* if after a PTRACE_SYSCALL_SKIPCALL p[0] is already <0 
> +	 * pipe has been really skipped */
> +	if (p[0] < 0)
> +		*featurep=PTRACE_SYSCALL_SKIPCALL;
> +	else { /* clean up everything */
> +		close(p[0]);
> +		close(p[1]);
> +	}
> +	return 0;

Please check Documentation/CodingStyle. Every second line above 
violates it. scripts/checkpatch.pl can help out with the more 
obvious ones.

	Ingo
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