From: Mike Frysinger <vapier@gentoo.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [RFC/PATCH] Makefile: allow boards to check file size limits
Date: Tue, 19 Oct 2010 00:17:51 -0400 [thread overview]
Message-ID: <201010190017.52346.vapier@gentoo.org> (raw)
In-Reply-To: <20101018204337.8534A136320@gemini.denx.de>
On Monday, October 18, 2010 16:43:37 Wolfgang Denk wrote:
> Mike Frysinger wrote:
> > +ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
> > +BOARD_SIZE_CHECK = \
> > + @actual=`wc -c $@ | awk '{print $$1}'`; \
>
> How about using
>
> stat -c '%s'
>
> to get the file size in a single command, without need to actually
> read all the data?
because `stat` isnt portable :(. it isnt part of the POSIX standard ... OS X
certainly does not support this, and i imagine most *BSD's dont.
`wc -c` on the other hand should work everywhere and is part of POSIX.
looking at the `strace` output, the GNU wc doesnt actually read() the file
when using just the -c option. seems to use lseek(SEEK_END).
-mike
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next prev parent reply other threads:[~2010-10-19 4:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-14 2:58 [U-Boot] [RFC/PATCH] Makefile: allow boards to check file size limits Mike Frysinger
2010-10-18 20:43 ` Wolfgang Denk
2010-10-19 4:17 ` Mike Frysinger [this message]
2010-10-19 5:24 ` Wolfgang Denk
2010-10-19 5:38 ` Mike Frysinger
2010-10-19 21:29 ` Wolfgang Denk
2010-10-20 4:38 ` Vaibhav Bedia
2010-10-20 5:16 ` Mike Frysinger
2010-10-20 6:56 ` Vaibhav Bedia
2010-10-20 7:19 ` Wolfgang Denk
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