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From: Lev Olshvang <levonshe@yandex.com>
To: kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: In a process context kernel_read returns -EINTR, how to proceed?
Date: Thu, 20 Dec 2018 13:33:09 +0300	[thread overview]
Message-ID: <92921545301989@sas2-9bd6ba081e5d.qloud-c.yandex.net> (raw)

Hi All,

I use kernel_read to read  file in chunks of 4K size in a process context
On several files, like libc, libm,  I got -EINTR error.

Then I repeated the attempt limited number of times but still on every read attempt I got -EINTR

I do not understand who may interrupt such a small read, I suppose these libraries are already mapped in other processes so no real I/O should be done.

In a user space it is recommended to repeat syscall, what is the proper course of action in kernel.
As I stated, this code is not in a kernel thread or atomic context, it is in a process context so a tried  before next attempt yield() but to no success.

Waiting for your advises.
Thx,
Lev


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             reply	other threads:[~2018-12-20 10:33 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-20 10:33 Lev Olshvang [this message]
2018-12-20 16:40 ` In a process context kernel_read returns -EINTR, how to proceed? valdis.kletnieks
2018-12-21 13:51   ` Lev Olshvang
2018-12-21 14:00     ` Greg KH
2018-12-21 16:15     ` valdis.kletnieks
2018-12-23  8:41       ` Lev Olshvang
2018-12-23  8:53         ` valdis.kletnieks

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