Date: Sat, 12 Oct 2002 11:57:23 -0400 From: Craig Rodrigues <rodrigc@attbi.com> To: freebsd-current@freebsd.org Subject: Re: Bad system call: aio_read() Message-ID: <20021012115723.A22674@attbi.com> In-Reply-To: <20021012164925.C424@aldebaran.dx>; from Dirk.Roehrdanz@t-online.de on Sat, Oct 12, 2002 at 04:49:25PM %2B0200 References: <20021012095302.A22260@attbi.com> <20021012142400.GA26739@rz.uni-karlsruhe.de> <20021012164925.C424@aldebaran.dx>
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--45Z9DzgjV8m4Oswq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sat, Oct 12, 2002 at 04:49:25PM +0200, Dirk Roehrdanz wrote: > Hello, > > On 0, Philipp Mergenthaler <un1i@rz.uni-karlsruhe.de> wrote: > > On Sat, Oct 12, 2002 at 09:53:02AM -0400, Craig Rodrigues wrote: > > > I just did a cvsup and rebuilt the world on my -CURRENT system. > > > If I try to run the following program, I get a "Bad system call" coredump: > > [...] > > > 2660 a.out CALL aio_read(0xbfbffb88) > > > 2660 a.out RET aio_read -1 errno 78 Function not implemented > > > > Does your kernel configuration file contain the line "options VFS_AIO"? > > I have a kernel (with this option)+world from yesterday, and aio_read works. I do not have options VFS_AIO in my kernel config. > you can get this functionality with "kldload aio" Thanks, doing a kldload aio worked. Where is stuff like this documented for end-users? In this patch to /usr/src/sys/sys/syscalls.master that AIO was made a loadable module: ======================================================================= Revision 1.101 / (download) - annotate - [select for diffs], Sat Dec 29 07:13:45 2001 UTC (9 months, 1 week ago) by alfred Branch: MAIN Changes since 1.100: +8 -8 lines Diff to previous 1.100 (colored) Make AIO a loadable module. ======================================================================= I am trying to port the ACE library ( http://www.cs.wustl.edu/~schmidt/ACE.html ) to FreeBSD-CURRENT, and it is very confusing that code in -STABLE which compiled and worked, does not work the same way in -CURRENT. (ie. the code compiles, but it crashes because of a new kernel option not being enabled or a module not being kldload'ed). This will be very confusing to end-users of ACE on FreeBSD unless it is documented. Would the following patch be acceptable for the aio_read man page? I can supply a similar patch to the other POSIX aio functions. Thanks. -- Craig Rodrigues http://www.gis.net/~craigr rodrigc@attbi.com --45Z9DzgjV8m4Oswq Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="aio_read.2.patch.txt" --- aio_read.2.orig Sat Oct 12 11:42:52 2002 +++ aio_read.2 Sat Oct 12 11:55:57 2002 @@ -179,6 +179,33 @@ .Fa iocb->aio_offset would be invalid. .El +.Sh KERNEL OPTIONS +The following kernel configuration option +(see +.Xr config 8 ) +is required +.Pp +.Dl "options VFS_AIO" +.Pp +If you do not want AIO support included in the kernel, but +want to use it occasionally, do not add the +.Dv VFS_AIO +option. Instead, load the +.Nm aio +module as desired: +.Pp +.Dl kldload aio +.Pp +.Sh SEE ALSO +.Xr aio_cancel 2 , +.Xr aio_error 2 , +.Xr aio_return 2 , +.Xr aio_suspend 2 , +.Xr aio_waitcomplete 2 , +.Xr aio_write 2 , +.Xr config 8 , +.Xr kldload 8 , +.Xr kldunload 8 .Sh STANDARDS The .Fn aio_read --45Z9DzgjV8m4Oswq-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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