Re: An interrupt handler can call function sprintf()?

From	Jerry Peters <jerry@example.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: An interrupt handler can call function sprintf()?
Date	2013-05-19 20:58 +0000
Organization	A noiseless patient Spider
Message-ID	<knbee5$a4f$1@dont-email.me> (permalink)
References	<6c25f801-621d-4484-a3b2-f5cc4491a4a6@googlegroups.com> <knbd90$qbd$1@dont-email.me>

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Jerry Peters <jerry@example.invalid> wrote:
> fl <rxjwg98@gmail.com> wrote:
>> Hi,
>> 
>> I remember it said that C lib function printf() cannot be called in a device driver in Linux. Today I come across the following code snippet. I wonder that sprintf function can be called in the interrupt function?
>> 
> It can't, because it writes to a file, stdout. Sprintf "writes" to an
> existing string so there's no i/o. Sprintf is just a convenient way to
> construct a fancy formatted string.
> 
> There is another function, kprintf, which can be used similiarly to
> printf, but it wrties to a kernel buffer.

Oops, meant printk, not kprintf.

	Jerry

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An interrupt handler can call function sprintf()? fl <rxjwg98@gmail.com> - 2013-05-19 10:11 -0700
  Re: An interrupt handler can call function sprintf()? Jerry Peters <jerry@example.invalid> - 2013-05-19 20:38 +0000
    Re: An interrupt handler can call function sprintf()? Jerry Peters <jerry@example.invalid> - 2013-05-19 20:58 +0000

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