diff options
author | jasone <jasone@FreeBSD.org> | 2000-03-21 10:25:22 +0000 |
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committer | jasone <jasone@FreeBSD.org> | 2000-03-21 10:25:22 +0000 |
commit | d7816647eff32abf1cc239b5db9d44b579c4de47 (patch) | |
tree | b3982f1bfd059e7e2bdd6c47a0f6aa77c4675af2 /lib/libc | |
parent | d9acd189c2b97e0d82a5dc4bdd6edfae0315c852 (diff) | |
download | FreeBSD-src-d7816647eff32abf1cc239b5db9d44b579c4de47.zip FreeBSD-src-d7816647eff32abf1cc239b5db9d44b579c4de47.tar.gz |
Add a man page for aio_waitcomplete(). Update the aio_cancel() man page to
reflect the fact that aio_cancel() works now.
Submitted by: Christopher Sedore <cmsedore@maxwell.syr.edu>
Diffstat (limited to 'lib/libc')
-rw-r--r-- | lib/libc/sys/Makefile.inc | 2 | ||||
-rw-r--r-- | lib/libc/sys/aio_cancel.2 | 67 | ||||
-rw-r--r-- | lib/libc/sys/aio_waitcomplete.2 | 129 |
3 files changed, 179 insertions, 19 deletions
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc index ebca7ed..37d42bb 100644 --- a/lib/libc/sys/Makefile.inc +++ b/lib/libc/sys/Makefile.inc @@ -75,7 +75,7 @@ ${SPSEUDOR}: .if ${LIB} == "c" MAN2+= _exit.2 accept.2 access.2 acct.2 adjtime.2 \ aio_cancel.2 aio_error.2 aio_read.2 aio_return.2 \ - aio_suspend.2 aio_write.2 \ + aio_suspend.2 aio_waitcomplete.2 aio_write.2 \ bind.2 brk.2 chdir.2 chflags.2 \ chmod.2 chown.2 chroot.2 clock_gettime.2 close.2 \ connect.2 dup.2 execve.2 \ diff --git a/lib/libc/sys/aio_cancel.2 b/lib/libc/sys/aio_cancel.2 index 275c3eb..edec2e9 100644 --- a/lib/libc/sys/aio_cancel.2 +++ b/lib/libc/sys/aio_cancel.2 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd June 2, 1999 +.Dd January 19, 2000 .Dt AIO_CANCEL 2 .Os .Sh NAME @@ -33,21 +33,41 @@ .Sh SYNOPSIS .Fd #include <aio.h> .Ft int -.Fn aio_cancel "int something" "struct aiocb * iocb" +.Fn aio_cancel "int fildes" "struct aiocb * iocb" .Sh DESCRIPTION The .Fn aio_cancel -function is supposed to cancel the specified outstanding asynchronous -I/O request. +function cancels the outstanding asynchronous +I/O request for the file descriptor specified in +.Ar fildes . +If +.Ar iocb +is specified, only that specific asynchronous I/O request is cancelled. +.Pp +Normal asynchronous notification occurs for cancelled requests. Requests +complete with an error result of +.Dv ECANCELED . +.Sh RESTRICTIONS +The +.Fn aio_cancel +function does not cancel asynchronous I/O requests for raw disk devices. The .Fn aio_cancel -is not implemented at this time, and always fails returning -.Dv ENOSYS . +function will always return +.Dv AIO_NOTCANCELED +for file descriptors associated with raw disk devices. .Sh RETURN VALUES -When +The .Fn aio_cancel -inevitably fails, it returns -.Dv ENOSYS -to signify it is not supported. +function returns -1 to indicate an error, or one of the following: +.Bl -tag -width Dv +.It Bq Dv AIO_CANCELED +All outstanding requests meeting the criteria specified were cancelled. +.It Bq Dv AIO_NOTCANCELED +Some requests were not cancelled, status for the requests should be +checked with aio_error(2). +.It Bq Dv AIO_ALLDONE +All of the requests meeting the criteria have finished. +.El .Sh SEE ALSO .Xr aio_error 2 , .Xr aio_read 2 , @@ -55,24 +75,35 @@ to signify it is not supported. .Xr aio_suspend 2 , .Xr aio_write 2 . .Sh ERRORS -The +An error return from .Fn aio_cancel -function currently always fails, due to: +indicates: .Bl -tag -width Er -.It Bq Er ENOSYS -this operation is not implemented at this time. +.It Bq Er EBADF +.Ar fildes +is an invalid file descriptor. .El .Sh STANDARDS -.Nm -fails to conform to the +The +.Fn aio_cancel +function is expected to conform to the .St -p1003.2 standard. .Sh HISTORY The -.Nm +.Fn aio_cancel function first appeared in .Fx 3.0 . +The first functional implemenation of +.Fn aio_cancel +appeared in +.Fx 4.0 . .Sh AUTHORS This -manual page was written by +manual page was originally written by .An Wes Peters Aq wes@softweyr.com . +.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu +updated it when +.Fn aio_cancel +was implemented for FreeBSD 4.0. + diff --git a/lib/libc/sys/aio_waitcomplete.2 b/lib/libc/sys/aio_waitcomplete.2 new file mode 100644 index 0000000..2447c90 --- /dev/null +++ b/lib/libc/sys/aio_waitcomplete.2 @@ -0,0 +1,129 @@ +.\" Copyright (c) 1999 Christopher M Sedore. +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd January 19, 2000 +.Dt AIO_WAITCOMPLETE 2 +.Os +.Sh NAME +.Nm aio_waitcomplete +.Nd wait for the next completion of an aio request +.Sh SYNOPSIS +.Fd #include <aio.h> +.Ft int +.Fn aio_waitcomplete "struct aiocb **iocbp, struct timeval *timeout" +.Sh DESCRIPTION +The +.Fn aio_waitcomplete +function waits for completion of an asynchronous I/O request. Upon completion, +.Fn aio_waitcomplete +returns the result of the function and sets +.Ar iocbp +to point to the structure associated with the original request. If an +asynchronous I/O request is completed before +.Fn aio_waitcomplete +is called, it returns immediately with the completed request. +.Pp +If +.Ar timeout +is a non-NULL pointer, it specifies a maximum interval to wait for a +asynchronous I/O request to complete. If +.Ar timeout +is a NULL pointer, +.Fn aio_waitcomplete +waits indefinitely. To effect a poll, the +.Ar timeout +argument should be non-NULL, pointing to a zero-valued timeval structure. +.Pp +The +.Fn aio_waitcomplete +function also serves the function of +.Fn aio_return , +thus +.Fn aio_return +should not be called for the control block returned in +.Ar iocbp . +.Sh RETURN VALUES +If an asynchronous I/O request has completed, +.Ar iocbp +is set to point to the control block passed with the original request, and +the status is returned as described in +.Xr read 2 , +.Xr write 2 , +or +.Xr fsync 2 . +On failure, +.Fn aio_waitcomplete +returns +.Dv -1 , +sets iocbp to +.Dv NULL +and +.Dv errno +to indicate the error condition. +.Sh ERRORS +The +.Fn aio_waitcomplete +function fails if: +.Bl -tag -width Er +.It Bq Er EINVAL +The specified time limit is invalid. +.It Bq Er EAGAIN +The process has not yet called +.Fn aio_read +or +.Fn aio_write . +.It Bq Er EINTR +A signal was delivered before the timeout expired and before any +asynchronous I/O requests completed. +.It Bq Er EWOULDBLOCK +.It Bq Er EINPROGRESS +The specified time limit expired before any asynchronous I/O requests +completed. +.El +.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_write 2 , +.Xr fsync 2 , +.Xr read 2 , +.Xr write 2 . +.Sh STANDARDS +The +.Fn aio_waitcomplete +function is a FreeBSD-specific extension. +.Sh HISTORY +The +.Fn aio_waitcomplete +function first appeared in +.Fx 4.0 . +.Sh AUTHORS +The +.Fn aio_waitcomplete +function and this manual page were written by +.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu . |