linux-kernel - Re: [PATCH] Return real errno from execve in ____call

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Message-Id: <200608201501.29296.arnd@arndb.de>
Date:	Sun, 20 Aug 2006 15:01:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Andrew Morton <akpm@...l.org>,
	Björn Steinbrink <B.Steinbrink@....de>,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Return real errno from execve in ____call_usermodehelper

On Saturday 19 August 2006 10:42, Russell King wrote:
> Maybe what we should be thinking of doing is changing execve() calls
> to kernel_execve() which returns the error code.
> 
> This way, architectures are free to implement execve() whatever way
> they wish - and if they're concerned about using errno, that's their
> own implementation specific detail.

Sounds good, it means we could finally kill __KERNEL_SYSCALLS__ along
with lib/errno.c.

I guess a fallback for those that haven't yet done kernel_execve could be

#ifdef CONFIG_ARCH_KERNEL_EXECVE
extern int kernel_execve(const char *filename,
		char *const argv[], char *const envp[]);
#else
static inline int kernel_execve(const char *filename,
		char *const argv[], char *const envp[]);
{
	int errno;
	mm_segment_t old_fs = get_fs();
	set_fs(KERNEL_DS);
	/* the kernel syscall macro modifies errno */
	execve(filename, argv, envp);
	set_fs(old_fs);
	return errno;
}
#endif

With that in place, we can remove the global errno right away, and the
kernel syscalls for any architecture that implements its own kernel_execve.

	Arnd <><
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