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Bug 82643 - Unexpected SIGIO with RH8
Unexpected SIGIO with RH8
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2003-01-24 08:03 EST by Michael Marxmeier
Modified: 2007-04-18 12:50 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2004-09-30 11:40:26 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Michael Marxmeier 2003-01-24 08:03:27 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3b) Gecko/20030119

Description of problem:
RH 8.0, Kernel 2.4.14-14 (same with 2.4.18.-19.8.0)

In our application we encounter unexpected SIGIO signals.
This neither happened on RH 7.3 nor on SuSE 8.1.

The application enables SIGIO for stdin to get async
notification of keyboard input. However with RH8 SIGIO
seems to happen unrelated to stdin.

Shortened strace is below:

rt_sigaction(SIGIO, {0x8074c90, [], SA_RESTORER|SA_RESTART, 0x42028c48}, NULL,
8) = 0
fcntl64(0, F_GETFL)                     = 0x8002 (flags O_RDWR|O_LARGEFILE)
--- SIGIO (I/O possible) ---
select(1024, [0], NULL, NULL, {0, 0})   = 0 (Timeout)
sigreturn()                             = ? (mask now [])
write(1, "\33[24;1H\r", 8)              = 8
--- SIGIO (I/O possible) ---
select(1024, [0], NULL, NULL, {0, 0})   = 0 (Timeout)
sigreturn()                             = ? (mask now [])
write(1, "\33[?25h", 6)                 = 6
--- SIGIO (I/O possible) ---
select(1024, [0], NULL, NULL, {0, 0})   = 0 (Timeout)
sigreturn()                             = ? (mask now [])

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. run application

Actual Results:  SIGIO signals related to fd 1 (and fd 0 as well)

Expected Results:  SIGIO signals related to fd 0

Additional info:
Comment 1 Mika Ilmaranta 2003-03-12 17:11:46 EST
Seems that the same happens still with 2.4.18-26.8.0.

SIGIO seems to work as supposed when application is run from console.

Comment 2 Bugzilla owner 2004-09-30 11:40:26 EDT
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem

The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, 
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/

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