Date: Thu, 24 Oct 2002 17:07:37 -0400 From: Craig Rodrigues <rodrigc@attbi.com> To: cvs-committers@FreeBSD.org Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/lib/libc/sys aio_cancel.2 aio_error.2 aio_read.2 aio_return.2 aio_suspend.2 aio_waitcomplete.2 aio_write.2 Message-ID: <20021024170737.A34595@attbi.com> In-Reply-To: <20021022164649.GS91539@elvis.mu.org>; from alfred@FreeBSD.org on Tue, Oct 22, 2002 at 09:46:49AM -0700 References: <200210221612.g9MGCR1p012070@repoman.freebsd.org> <20021022161820.GA57732@starjuice.net> <20021022164649.GS91539@elvis.mu.org>
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--2fHTh5uZTiUOsy+g Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Oct 24, 2002 at 10:55:55PM +0200, Philippe Charnier wrote: > Salut, > > Please add the following patch OK, I incorporated some minor fixes to aio.4 from Philippe. Here's what I've got. -- Craig Rodrigues http://www.gis.net/~craigr rodrigc@attbi.com --2fHTh5uZTiUOsy+g Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="aio.4" .\" .\" $FreeBSD$ .\" .Dd October 23, 2002 .Dt AIO 4 .Os .Sh NAME .Nm aio .Nd asynchronous I/O .Sh SYNOPSIS .Cd "options VFS_AIO" .Sh DESCRIPTION The .Nm kernel module provides system calls for asynchronous I/O. .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 module as desired: .Pp .Dl kldload aio .Pp .Sh APPLICATION USAGE Asynchronous I/O is specified as an option in .St -p1003.1-2001 and earlier standards. A portable application must be prepared for the possibility that asynchronous I/O may not be available, and also that it may not be available at run-time for certain files or types of file descriptors. .Pp The .Dv _POSIX_ASYNCHRONOUS_IO macro in .Pa unistd.h describes the compile-time support for .Nm . The following conditions are possible: .Bl -inset -offset indent .It Dv _POSIX_ASYNCHRONOUS_IO No is not defined . The implementation provides no information about whether programs using .Nm can be compiled. .It Dv _POSIX_ASYNCHRONOUS_IO No is defined to \-1 . The implementation does not support the asynchronous I/O feature; the .Pa aio.h header file and .Fn aio_* functions are not provided. .It Dv _POSIX_ASYNCHRONOUS_IO No is defined to a positive integer . The implementation supports the asynchronous I/O feature unconditionally, for all files and all file descriptors. The .Pa aio.h header file and .Fn aio_* functions are provided. .It Dv _POSIX_ASYNCHRONOUS_IO No is defined to zero . The implementation optionally supports asynchronous I/O. The .Pa aio.h header file and .Fn aio_* functions are provided. However, the result of calling any .Fn aio_* function is undefined unless the application has checked that the asynchronous I/O option is supported on the files or file descriptors it plans to use, by calling the .Xr pathconf 2 or .Xr fpathconf 2 function with a .Fa name argument of .Dv _PC_ASYNC_IO . If .Nm is available for the specified file (or descriptor), .Xr pathconf 2 (or .Xr fpathconf 2 ) will return a positive integer which is equal to the value specified for .Dv _POSIX_VERSION by the version of the standard the system implements. .El .Pp These configuration parameters can be queried by shell scripts using the .Xr getconf 1 program. .Sh SEE ALSO .Xr aio_cancel 2 , .Xr aio_error 2 , .Xr aio_read 2 , .Xr aio_return 2 , .Xr aio_suspend 2 , .Xr aio_waitcomplete 2 , .Xr aio_write 2 , .Xr kld 4 , .Xr config 8 , .Xr kldload 8 .Sh HISTORY The .Nm facility appeared in .Fx 3.0 . --2fHTh5uZTiUOsy+g Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="aio2.diff" --- lib/libc/sys/aio_cancel.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_cancel.2 Thu Oct 24 11:06:08 2002 @@ -104,6 +104,7 @@ .Xr aio_return 2 , .Xr aio_suspend 2 , .Xr aio_write 2 , +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_error.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_error.2 Thu Oct 24 11:07:24 2002 @@ -96,6 +96,7 @@ .Xr fsync 2 , .Xr read 2 , .Xr write 2 +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_read.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_read.2 Thu Oct 24 11:07:04 2002 @@ -203,6 +203,7 @@ .Xr aio_suspend 2 , .Xr aio_waitcomplete 2 , .Xr aio_write 2 , +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_return.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_return.2 Thu Oct 24 11:06:50 2002 @@ -98,6 +98,7 @@ .Xr fsync 2 , .Xr read 2 , .Xr write 2 , +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_suspend.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_suspend.2 Thu Oct 24 11:06:38 2002 @@ -108,6 +108,7 @@ .Xr aio_return 2 , .Xr aio_waitcomplete 2 , .Xr aio_write 2 , +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_waitcomplete.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_waitcomplete.2 Thu Oct 24 11:06:27 2002 @@ -135,6 +135,7 @@ .Xr fsync 2 , .Xr read 2 , .Xr write 2 , +.Xr aio 4, .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --- lib/libc/sys/aio_write.2.orig Wed Oct 23 11:06:25 2002 +++ lib/libc/sys/aio_write.2 Thu Oct 24 11:07:50 2002 @@ -196,6 +196,7 @@ .Xr aio_return 2 , .Xr aio_suspend 2 , .Xr aio_waitcomplete 2 , +.Xr aio 4 , .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 --2fHTh5uZTiUOsy+g-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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