Hi all, Is there some documentation or some example on how to interpret the arg0 .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call name for all three seems to be "kaio". Michael === Michael Mueller =================Tel. + 49 8171 63600 Fax. + 49 8171 63615 Web: http://www.michael-mueller-it.de ======================================
Michael, I guess I''m not 100% sure of this, but the corresponding functions in aio.c is probably where the kaio system ends up sending you, and you can look at the prototypes for those at: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/p ort/aio/aio.c (Or maybe you were looking for more definitive documentation.) ;-) Chip> -----Original Message----- > From: dtrace-discuss-bounces at opensolaris.org [mailto:dtrace-discuss- > bounces at opensolaris.org] On Behalf Of Michael Mueller > Sent: Wednesday, February 18, 2009 12:02 PM > To: dtrace-discuss at opensolaris.org > Subject: [dtrace-discuss] tracing aio syscalls > > Hi all, > > Is there some documentation or some example on how to interpret the > arg0 > .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call > name for all three seems to be "kaio". > > Michael > > === Michael Mueller =================> Tel. + 49 8171 63600 > Fax. + 49 8171 63615 > Web: http://www.michael-mueller-it.de > =====================================> _______________________________________________ > dtrace-discuss mailing list > dtrace-discuss at opensolaris.org
On Wed, Feb 18, 2009 at 1:01 PM, Michael Mueller <mm at michael-mueller-it.de> wrote:> Hi all, > > Is there some documentation or some example on how to interpret the arg0 > .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call > name for all three seems to be "kaio". > > Michael >When you see things like this (i.e., multiple system calls mapping to a single syscall probefunc, there are generally subcodes involved.>From http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/sys/syscall.h:377 #define SYS_kaio 178 378 /* 379 * subcodes: 380 * aioread(...) :: kaio(AIOREAD, ...) 381 * aiowrite(...) :: kaio(AIOWRITE, ...) 382 * aiowait(...) :: kaio(AIOWAIT, ...) 383 * aiocancel(...) :: kaio(AIOCANCEL, ...) 384 * aionotify() :: kaio(AIONOTIFY) 385 * aioinit() :: kaio(AIOINIT) 386 * aiostart() :: kaio(AIOSTART) 387 * see <sys/aio.h> 388 */ What''s going to happen is that arg0 to syscall::kaio:entry will be the subcode, and then arg1 ... arg<n> will be the arguments passed to, e.g., aioread(). Chad
Chad,
Unfortunateley this works except for the resultp argument of aiowrite
and the return value of aiowait. Does anybody know how to get this working?
Test program:
-------------
#include <stdio.h>
#include <sys/types.h>
#include <sys/asynch.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define OFF 4096
#define L (2048)
char buf[L];
int
main()
{
int fd;
aio_result_t r, *p;
fd = open("FILE", O_RDWR|O_CREAT, 0666);
printf("aiowrite(fd %d, bufp %p, bufs %d, offset %d,"
" whence %d, resultp %p)\n", fd, buf, L, OFF,
SEEK_SET, &r);
if (aiowrite(fd, buf, L, OFF, SEEK_SET, &r))
perror("aiowrite");
p = aiowait(NULL);
if ((int)p == -1)
perror("aiowait");
printf("aiowait returned %p\n", p);
}
cc -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g tst.c -o tst -laio
# Platform is Solaris SPARC
Dtrace script:
--------------
/usr/sbin/dtrace -q -c tst -s /dev/fd/0 <<eof
syscall::kaio:entry
/arg0 == 1/ /* AIOWRITE */
{
printf("kaio write %d %d %x %d %d %d %x\n",
arg0, arg1, arg2, arg3, arg4, arg5, arg6);
}
syscall::kaio:entry
/arg0 == 2/ /* AIOWAIT */
{
printf("kaio wait %d %d\n", arg0, arg1);
self->f = 1;
}
syscall::kaio:return
/self->f/
{
self->f = 0;
printf("kaio wait return %p\n", arg0);
}
eof
Output:
-------
aiowrite(fd 3, bufp 21000, bufs 2048, offset 4096, whence 0,
resultp ffbffc40)
aiowait returned ffbffc40
kaio write 1 3 21000 2048 0 4096 1182001a04
kaio wait 2 0
kaio wait return 100000000
For the aiowrite resultp I get 1182001a04 instead of ffbffc40. And the
return value of aiowait is 100000000.
Michael
Chad Mynhier wrote:> On Wed, Feb 18, 2009 at 1:01 PM, Michael Mueller
> <mm at michael-mueller-it.de> wrote:
>> Hi all,
>>
>> Is there some documentation or some example on how to interpret the
arg0
>> .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system
call
>> name for all three seems to be "kaio".
>>
>> Michael
>>
>
> When you see things like this (i.e., multiple system calls mapping to
> a single syscall probefunc, there are generally subcodes involved.
>
>>From
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/sys/syscall.h:
>
> 377 #define SYS_kaio 178
> 378 /*
> 379 * subcodes:
> 380 * aioread(...) :: kaio(AIOREAD, ...)
> 381 * aiowrite(...) :: kaio(AIOWRITE, ...)
> 382 * aiowait(...) :: kaio(AIOWAIT, ...)
> 383 * aiocancel(...) :: kaio(AIOCANCEL, ...)
> 384 * aionotify() :: kaio(AIONOTIFY)
> 385 * aioinit() :: kaio(AIOINIT)
> 386 * aiostart() :: kaio(AIOSTART)
> 387 * see <sys/aio.h>
> 388 */
>
> What''s going to happen is that arg0 to syscall::kaio:entry will be
the
> subcode, and then arg1 ... arg<n> will be the arguments passed to,
> e.g., aioread().
>
> Chad
>
--
==== Michael Mueller ===========================Tel. 49 8171 63600
Web: http://www.michael-mueller-it.de
http://www.planets.kay-mueller.de
=================================================
Mheanwhile I solved part of the riddle myself. For a plain file aiowrite etc. is not a simple system call. It forks a thread that does complex things and uses aio system calls and pwrite. But one question I still have. The good old truss shows: kaio(AIOWRITE, 3, 0x00021000, 2048, 4096, 0xFFBFFBF0) Err#81 EBADFD But my dtrace script outputs these args: kaio write 1 3 21000 2048 0 4096 1182001a00 There is a 0 for arg4 and the last arg is 1182001a00 instead of 0xFFBFFBF0. Michael Michael Mueller wrote:> Chad, > > Unfortunateley this works except for the resultp argument of aiowrite > and the return value of aiowait. Does anybody know how to get this working? > > Test program: > ------------- > > #include <stdio.h> > #include <sys/types.h> > #include <sys/asynch.h> > #include <sys/stat.h> > #include <fcntl.h> > #include <unistd.h> > > #define OFF 4096 > #define L (2048) > char buf[L]; > > int > main() > { > int fd; > aio_result_t r, *p; > > fd = open("FILE", O_RDWR|O_CREAT, 0666); > printf("aiowrite(fd %d, bufp %p, bufs %d, offset %d," > " whence %d, resultp %p)\n", fd, buf, L, OFF, > SEEK_SET, &r); > if (aiowrite(fd, buf, L, OFF, SEEK_SET, &r)) > perror("aiowrite"); > > p = aiowait(NULL); > if ((int)p == -1) > perror("aiowait"); > printf("aiowait returned %p\n", p); > } > > cc -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g tst.c -o tst -laio > # Platform is Solaris SPARC > > > Dtrace script: > -------------- > > /usr/sbin/dtrace -q -c tst -s /dev/fd/0 <<eof > syscall::kaio:entry > /arg0 == 1/ /* AIOWRITE */ > { > printf("kaio write %d %d %x %d %d %d %x\n", > arg0, arg1, arg2, arg3, arg4, arg5, arg6); > } > > syscall::kaio:entry > /arg0 == 2/ /* AIOWAIT */ > { > printf("kaio wait %d %d\n", arg0, arg1); > self->f = 1; > } > > syscall::kaio:return > /self->f/ > { > self->f = 0; > printf("kaio wait return %p\n", arg0); > } > eof > > > Output: > ------- > > aiowrite(fd 3, bufp 21000, bufs 2048, offset 4096, whence 0, > resultp ffbffc40) > aiowait returned ffbffc40 > kaio write 1 3 21000 2048 0 4096 1182001a04 > kaio wait 2 0 > kaio wait return 100000000 > > For the aiowrite resultp I get 1182001a04 instead of ffbffc40. And the > return value of aiowait is 100000000. > > Michael > > Chad Mynhier wrote: >> On Wed, Feb 18, 2009 at 1:01 PM, Michael Mueller >> <mm at michael-mueller-it.de> wrote: >>> Hi all, >>> >>> Is there some documentation or some example on how to interpret the arg0 >>> .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call >>> name for all three seems to be "kaio". >>> >>> Michael >>> >> >> When you see things like this (i.e., multiple system calls mapping to >> a single syscall probefunc, there are generally subcodes involved. >> >>> From >>> http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/sys/syscall.h: >>> >> >> 377 #define SYS_kaio 178 >> 378 /* >> 379 * subcodes: >> 380 * aioread(...) :: kaio(AIOREAD, ...) >> 381 * aiowrite(...) :: kaio(AIOWRITE, ...) >> 382 * aiowait(...) :: kaio(AIOWAIT, ...) >> 383 * aiocancel(...) :: kaio(AIOCANCEL, ...) >> 384 * aionotify() :: kaio(AIONOTIFY) >> 385 * aioinit() :: kaio(AIOINIT) >> 386 * aiostart() :: kaio(AIOSTART) >> 387 * see <sys/aio.h> >> 388 */ >> >> What''s going to happen is that arg0 to syscall::kaio:entry will be the >> subcode, and then arg1 ... arg<n> will be the arguments passed to, >> e.g., aioread(). >> >> Chad >> > >-- ==== Michael Mueller ===========================Tel. 49 8171 63600 Web: http://www.michael-mueller-it.de http://www.planets.kay-mueller.de =================================================
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