dtrace discuss - Jun 2007 - Help required on tracing connect system call

Hi,

How do I dtrace the arguments of connect system call. Can some one send 
in me any pointers or scripts I can use.

I am looking for some thing like this.

connect(4, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("128.200.1.201")}, 28) = 0

-Regards
Hemachandran

"Hemachandran" == Hemachandran  <Hemachandran.Namachivayam at
Sun.COM> writes:

Hemachandran> Hi,
Hemachandran> How do I dtrace the arguments of connect system call. Can some
one send in
Hemachandran> me any pointers or scripts I can use.

Hemachandran> I am looking for some thing like this.

Hemachandran> connect(4, {sa_family=AF_INET, sin_port=htons(53),
Hemachandran> sin_addr=inet_addr("128.200.1.201")}, 28) = 0

Do you want dtrace, or would truss work for you?  truss can do that,
something like `truss -v connect <program>'' or `truss -v connect
-p
<pid>''.
-- 
Dave Marquardt
Sun Microsystems, Inc.
Austin, TX
+1 512 401-1077 (SUN internal: x64077)

How about something like this:

#include <sys/socket.h>
syscall::connect:entry
{
   printf ("Socket: %d, DataLen: %d\n", arg0, arg2);
   name = copyin (arg1, arg2);
   tracemem (name, sizeof(struct sockaddr));
}

You need the -C option on the command line to pick the header file, plus 
the length in socket.h might not be right for you.

Unfortunately, you need a constant for the tracemem length because of 
DTrace''s requirement for fixed length trace records.  If we some day
get
a way of specifying a tracemem with fixed max and a variable
"current",
then you could just specify the most it could ever be and be done with it.

Chip

Hemachandran wrote:
> Hi,
>
> How do I dtrace the arguments of connect system call. Can some one 
> send in me any pointers or scripts I can use.
>
> I am looking for some thing like this.
>
> connect(4, {sa_family=AF_INET, sin_port=htons(53), 
> sin_addr=inet_addr("128.200.1.201")}, 28) = 0
>
> -Regards
> Hemachandran
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org