Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
On 04.05.10 21:13, Yossi Lev wrote: No, this-entry-pc is not a user-space pointer --- it is not a pointer at all, it is an unsigned integer that I would like to convert to a string. Here is what I'm trying to do: - I have a structure of type ReadAcqEntry at userspace with various numeric fields (unsigned long long type). - I would like to convert a few of these fields to a string (e.g. for the purpose of concatenating it with other strings), and use the numerical value of the others. What I was doing so far is copying the whole structure with: this-entry = (ReadAcqEntry*)copyin((uintptr_t)(this-rAcqArr[this-numEntries-1]) , sizeof(ReadAcqEntry)); so now this-entry points to the local copy of the structure. Now I can access all of the structure's fields as integers (I tested this part and it works fine), but I am not sure how I can convert some of the fields to strings. What I really need is the equivalent of sprintf or itoa... It seems like stringof requires a pointer, so I am not sure that this is what I need to use here. no, you don't, regular printf will work: printf(%d, somenumber); stringof(p) returns string pointer to character array(p) (strings and character arrays are not the same in DTrace), but it does not do the integer-string conversion you're looking for. I can't think of a way of doing the exact equivalent of sprintf(s, %d, number) and then continue using 's' within your D script. what do you need a string for here that the numbers themselves won't solve? Michael -- Michael SchusterOracle Recursion, n.: see 'Recursion' ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] ?: DTrace of connection establishment attempts for destination address/port
Hi Steffen - I actually think that code did change quite a bit
from s10 to nv.
I'm not sure what you need to do, but you may want to grab
Brendan's DTraceToolKit and have a look at tcptop and
tcpsnoop, and have a look at how Brendan did it for s10.
Thanks,
/jim
On May 5, 2010, at 8:21 AM, Steffen Weiberle wrote:
Using Solaris 10, so no IP provider, I am trying to figure out when a
connection attempt is failing in a client. The connect() statement takes
a file descriptor, which is an integer and has no connection details.
Since I don't know if the connect is closely preceded with a bind() or a new
connection may be attempted with the same socket, and thus I won't be
capturing the bin, I can't rely on it to get the sockaddr structure.
(The event happens very infrequently, maybe once a day)
So I am trying tcp_connect FBT probe.
fbt::tcp_connect:entry
{
printf(execname: %s \n, execname);
self-sockaddr = args[1];
printf(family: %x \n, self-sockaddr-sa_family);
}
However, I get
# /var/tmp/connect.d
dtrace: failed to compile script /var/tmp/connect.d: line 32: sa_family
is not a member of struct msgb
Note is says 'msgb', not 'sockaddr'.
I got the args[1] from the OpenSolaris source code (and maybe that is my
problem, since I am running on Solaris 10--did the code change that
much?--seems unlikely)
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/inet/tcp/tcp_socket.c#232
Any good way to grab the IPv4 address and port number on an entry so I
can have it in the situation the connect() fails?
Thanks
Steffen
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Re: [dtrace-discuss] ?: DTrace of connection establishment attempts for destination address/port
Hi,
Steffen Weiberle wrote:
Using Solaris 10, so no IP provider, I am trying to figure out when a
connection attempt is failing in a client. The connect() statement takes
a file descriptor, which is an integer and has no connection details.
Since I don't know if the connect is closely preceded with a bind() or
a new connection may be attempted with the same socket, and thus I
won't be capturing the bin, I can't rely on it to get the sockaddr
structure.
(The event happens very infrequently, maybe once a day)
So I am trying tcp_connect FBT probe.
fbt::tcp_connect:entry
{
printf(execname: %s \n, execname);
self-sockaddr = args[1];
printf(family: %x \n, self-sockaddr-sa_family);
}
However, I get
# /var/tmp/connect.d
dtrace: failed to compile script /var/tmp/connect.d: line 32: sa_family
is not a member of struct msgb
Note is says 'msgb', not 'sockaddr'.
Try:
self-sockaddr = (struct sockaddr *) args[1]-b_rptr;
struct msgb is a STREAMS mblk_t.
max
I got the args[1] from the OpenSolaris source code (and maybe that is my
problem, since I am running on Solaris 10--did the code change that
much?--seems unlikely)
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/inet/tcp/tcp_socket.c#232
Any good way to grab the IPv4 address and port number on an entry so I
can have it in the situation the connect() fails?
Thanks
Steffen
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Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
Hi Michael I just found a function that (sort of) does what I need: it is called lltostr and it takes a long long integer, and returns a string that represents it. (Unfortunately I didn't find an option to do the translation in hexadecimal, but I can live with that...) As for your question, I need to use the numbers as a key to an aggregation, but I need to concatenate a few of those. In particular, I have a sequence of N numbers where N 9, and I need to count how many times I'm getting each sequence. The value of N may be different in separate invocations of the probe function, so I would like to use an unrolled loop to concatenate the N numbers to single string representing the sequence, and then use the string as the key to my aggregation. Do you see any other option but to use the lltostr function to and concatenate the resulted strings? Thanks, Yossi -- This message posted from opensolaris.org ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
On 05.05.10 18:11, Yossi Lev wrote: Hi Michael I just found a function that (sort of) does what I need: it is called lltostr and it takes a long long integer, and returns a string that represents it. (Unfortunately I didn't find an option to do the translation in hexadecimal, but I can live with that...) As for your question, I need to use the numbers as a key to an aggregation, but I need to concatenate a few of those. In particular, I have a sequence of N numbers where N 9, and I need to count how many times I'm getting each sequence. The value of N may be different in separate invocations of the probe function, so I would like to use an unrolled loop to concatenate the N numbers to single string representing the sequence, and then use the string as the key to my aggregation. Do you see any other option but to use the lltostr function to and concatenate the resulted strings? does this answer your question: $ pfexec dtrace -n 'syscall:::ent...@c[execname,pid] = count()}' dtrace: description 'syscall:::entry' matched 227 probes look closely at the [...] part :-) HTH Michael -- michael.schus...@oracle.com http://blogs.sun.com/recursion Recursion, n.: see 'Recursion' ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
On Wed, May 05, 2010 at 09:11:27AM -0700, Yossi Lev wrote: I just found a function that (sort of) does what I need: it is called lltostr and it takes a long long integer, and returns a string that represents it. (Unfortunately I didn't find an option to do the translation in hexadecimal, but I can live with that...) As for your question, I need to use the numbers as a key to an aggregation, but I need to concatenate a few of those. In particular, I have a sequence of N numbers where N 9, and I need to count how many times I'm getting each sequence. The value of N may be different in separate invocations of the probe function, so I would like to use an unrolled loop to concatenate the N numbers to single string representing the sequence, and then use the string as the key to my aggregation. Do you see any other option but to use the lltostr function to and concatenate the resulted strings? Yes: aggregations take multiple keys, not just one, so rather than format a string with all the key content that you need: use a comma- separated list of expressions of various types as the key. See: http://docs.sun.com/app/docs/doc/819-5488/gcggh?a=view Nico -- ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
Thanks, I know that I can provide multiple keys, but the number of keys for an aggregation must be constant, and I didn't want to pad with zeros all missing keys as in the common case my sequence has 2 or 3 keys (and not the maximum number of 8). These are minor issues that have to do with how the data looks when it is printed at the end --- I'm trying to use DTrace to generate a performance profiling report that the users can read, so do not want to add many trailing zeros to everything. I guess I could store the information on different aggregations depending on the number of keys that I get, but an integer--string translation results in a much simpler/cleaner script, which is why I posted this message asking whether there is a function that does it. Thanks for all the help! Yossi -- This message posted from opensolaris.org ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] Invalid address error when using stringof to convert a pointer to a string
On 05.05.10 18:40, Yossi Lev wrote: Thanks, I know that I can provide multiple keys, but the number of keys for an aggregation must be constant, and I didn't want to pad with zeros all missing keys as in the common case my sequence has 2 or 3 keys (and not the maximum number of 8). These are minor issues that have to do with how the data looks when it is printed at the end --- I'm trying to use DTrace to generate a performance profiling report that the users can read, so do not want to add many trailing zeros to everything. you may want to consider post-processing with your favourite string manipulation tool for the looks of your output. Michael -- michael.schus...@oracle.com http://blogs.sun.com/recursion Recursion, n.: see 'Recursion' ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
