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List:       freedesktop-xorg-devel
Subject:    [Xtrans] Interrupted function call for ioctl not handled
From:       Joerg.Vehlow () Xcerra ! com
Date:       2016-10-27 10:51:43
Message-ID: OFCF5BECF9.594E3234-ONC1258059.003B066C-C1258059.003BAAB6 () xcerra ! com
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Hi,

I just stumbled upon a bug in Xtrans socket transport on QNX 6.5:
At least on QNX 6.5 the syscall ioctl (FIONREAD) can be interrupted by a 
signal leading to a return value of -1 and errno set to EINTR.

The QNX documentation doesn't mention the error, but it maps the ioctl to 
a devctl, where the behavior is documented. In the POSIX specification 
EINTR is also documented.
I think this is a bug even in current implementations of Xtrans, because 
POSIX allows the EINTR and it for read and write it is handled, but not 
for the ioctl.

Maybe someone should look into fixing it in the future.

Regards Jörg
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<font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">I just stumbled upon a bug in Xtrans
socket transport on QNX 6.5:</font>
<br><font size=2 face="sans-serif">At least on QNX 6.5 the syscall ioctl
(FIONREAD) can be interrupted by a signal leading to a return value of
-1 and errno set to EINTR.</font>
<br>
<br><font size=2 face="sans-serif">The QNX documentation doesn't mention
the error, but it maps the ioctl to a devctl, where the behavior is documented.
In the POSIX specification EINTR is also documented.</font>
<br><font size=2 face="sans-serif">I think this is a bug even in current
implementations of Xtrans, because POSIX allows the EINTR and it for read
and write it is handled, but not for the ioctl.</font>
<br>
<br><font size=2 face="sans-serif">Maybe someone should look into fixing
it in the future.</font>
<br>
<br><font size=2 face="sans-serif">Regards Jörg</font>
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