* Does anyone have idea of how to trace the funtion "gethostbyname"?
@ 2008-10-30 1:44 Dongtao Liu
2008-10-31 14:34 ` Breno Leitao
0 siblings, 1 reply; 5+ messages in thread
From: Dongtao Liu @ 2008-10-30 1:44 UTC (permalink / raw)
To: systemtap
Hi all:
I recently doing some work to record all DNS lookups in the system.
Could anyone tell me how to trace the function of gethostbyname using
SystemTap?
Thank you very much!
Dongtao
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Does anyone have idea of how to trace the funtion "gethostbyname"?
2008-10-30 1:44 Does anyone have idea of how to trace the funtion "gethostbyname"? Dongtao Liu
@ 2008-10-31 14:34 ` Breno Leitao
2008-10-31 16:04 ` Frank Ch. Eigler
2008-11-01 20:14 ` Dongtao Liu
0 siblings, 2 replies; 5+ messages in thread
From: Breno Leitao @ 2008-10-31 14:34 UTC (permalink / raw)
To: Dongtao Liu; +Cc: systemtap
Dongtao Liu wrote:
> I recently doing some work to record all DNS lookups in the system.
> Could anyone tell me how to trace the function of gethostbyname using
> SystemTap?
Since this is not a kernel function, you might want to probe userspace
functions.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Does anyone have idea of how to trace the funtion "gethostbyname"?
2008-10-31 14:34 ` Breno Leitao
@ 2008-10-31 16:04 ` Frank Ch. Eigler
2008-11-01 20:14 ` Dongtao Liu
2008-11-01 20:14 ` Dongtao Liu
1 sibling, 1 reply; 5+ messages in thread
From: Frank Ch. Eigler @ 2008-10-31 16:04 UTC (permalink / raw)
To: Breno Leitao; +Cc: Dongtao Liu, systemtap
Breno Leitao <leitao@linux.vnet.ibm.com> writes:
>> Could anyone tell me how to trace the function of gethostbyname using
>> SystemTap?
> Since this is not a kernel function, you might want to probe userspace
> functions.
This should work, before long:
probe process("/libMMM/libc-NNN.so").function("gethostbyname").call { log(user_string($name)) }
In some testing on RHEL5 however, our prologue-searching heuristics
can't outwit gcc's poor debuginfo quality, so that parameter is hidden
at the moment. There's a systemtap PR about improving the heuristics.
- FChE
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Does anyone have idea of how to trace the funtion "gethostbyname"?
2008-10-31 16:04 ` Frank Ch. Eigler
@ 2008-11-01 20:14 ` Dongtao Liu
0 siblings, 0 replies; 5+ messages in thread
From: Dongtao Liu @ 2008-11-01 20:14 UTC (permalink / raw)
To: Frank Ch. Eigler; +Cc: Breno Leitao, systemtap
Is it "/lib/libc-2.7.so" in my system?
probe process("/lib/libc-2.7.so").function("gethostbyname").call {
log(user_string($name)) }
Then how long will SystemTap support to trace this function? Thans a lot!
This is the information about libc in my system.
dliu@dliu-desktop:/lib$ ls -all libc.so.6
lrwxrwxrwx 1 root root 11 2008-10-23 22:02 libc.so.6 -> libc-2.7.so
dliu@dliu-desktop:/lib$ ls -all libc-2.7.so
-rwxr-xr-x 1 root root 1274092 2008-09-12 10:32 libc-2.7.so
dliu@dliu-desktop:/lib$ ls -all libc*.so*
-rwxr-xr-x 1 root root 1274092 2008-09-12 10:32 libc-2.7.so
lrwxrwxrwx 1 root root 11 2008-10-23 22:02 libcap.so -> libcap.so.1
lrwxrwxrwx 1 root root 14 2008-10-23 17:30 libcap.so.1 -> libcap.so.1.10
-rw-r--r-- 1 root root 10316 2007-07-31 15:20 libcap.so.1.10
lrwxrwxrwx 1 root root 17 2008-10-23 17:30 libcfont.so.0 ->
libcfont.so.0.0.0
-rw-r--r-- 1 root root 11512 2008-02-06 17:49 libcfont.so.0.0.0
-rw-r--r-- 1 root root 181724 2008-09-12 10:32 libcidn-2.7.so
lrwxrwxrwx 1 root root 14 2008-10-23 22:02 libcidn.so.1 -> libcidn-2.7.so
lrwxrwxrwx 1 root root 17 2008-10-23 17:30 libcom_err.so.2 ->
libcom_err.so.2.1
-rw-r--r-- 1 root root 7444 2008-03-27 13:25 libcom_err.so.2.1
lrwxrwxrwx 1 root root 19 2008-10-23 17:30 libconsole.so.0 ->
libconsole.so.0.0.0
-rw-r--r-- 1 root root 73312 2008-02-06 17:49 libconsole.so.0.0.0
-rw-r--r-- 1 root root 38300 2008-09-12 10:32 libcrypt-2.7.so
lrwxrwxrwx 1 root root 15 2008-10-23 22:02 libcrypt.so.1 -> libcrypt-2.7.so
lrwxrwxrwx 1 root root 11 2008-10-23 22:02 libc.so.6 -> libc-2.7.so
lrwxrwxrwx 1 root root 19 2008-10-23 17:30 libctutils.so.0 ->
libctutils.so.0.0.0
-rw-r--r-- 1 root root 17424 2008-02-06 17:49 libctutils.so.0.0.0
2008/10/31 Frank Ch. Eigler <fche@redhat.com>:
> Breno Leitao <leitao@linux.vnet.ibm.com> writes:
>
>>> Could anyone tell me how to trace the function of gethostbyname using
>>> SystemTap?
>> Since this is not a kernel function, you might want to probe userspace
>> functions.
>
> This should work, before long:
>
> probe process("/libMMM/libc-NNN.so").function("gethostbyname").call { log(user_string($name)) }
>
> In some testing on RHEL5 however, our prologue-searching heuristics
> can't outwit gcc's poor debuginfo quality, so that parameter is hidden
> at the moment. There's a systemtap PR about improving the heuristics.
>
> - FChE
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Does anyone have idea of how to trace the funtion "gethostbyname"?
2008-10-31 14:34 ` Breno Leitao
2008-10-31 16:04 ` Frank Ch. Eigler
@ 2008-11-01 20:14 ` Dongtao Liu
1 sibling, 0 replies; 5+ messages in thread
From: Dongtao Liu @ 2008-11-01 20:14 UTC (permalink / raw)
To: Breno Leitao; +Cc: systemtap
yes, it is the function in libc. I downloaded the source code of
glibc-2.7.3 and found gethostbyname() function in
/resolv/gethnamaddr.c
dliu@dliu-desktop:/usr/src/glibc/glibc-2.7/resolv$ ls
arpa gai_misc.c getaddrinfo_a.c inet_net_pton.c
netdb.h ns_samedomain.c res_debug.c res_mkquery.c tst-aton.c
Banner gai_misc.h gethnamaddr.c inet_ntop.c
nsap_addr.c nss_dns res_debug.h resolv.h
tst-inet_ntop.c
base64.c gai_notify.c herror.c inet_pton.c
ns_name.c ns_ttl.c res_hconf.c res_query.c tst-leaks2.c
Depend gai_sigqueue.c inet_addr.c Makefile
ns_netint.c README res_hconf.h res_send.c tst-leaks.c
gai_cancel.c gai_suspend.c inet_neta.c mapv4v6addr.h
ns_parse.c res_comp.c res_init.c res-state.c Versions
gai_error.c ga_test.c inet_net_ntop.c mapv4v6hostent.h
ns_print.c res_data.c res_libc.c sys
2008/10/31 Breno Leitao <leitao@linux.vnet.ibm.com>:
> Dongtao Liu wrote:
>> I recently doing some work to record all DNS lookups in the system.
>> Could anyone tell me how to trace the function of gethostbyname using
>> SystemTap?
> Since this is not a kernel function, you might want to probe userspace
> functions.
>
^ permalink raw reply [flat|nested] 5+ messages in thread
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2008-10-30 1:44 Does anyone have idea of how to trace the funtion "gethostbyname"? Dongtao Liu
2008-10-31 14:34 ` Breno Leitao
2008-10-31 16:04 ` Frank Ch. Eigler
2008-11-01 20:14 ` Dongtao Liu
2008-11-01 20:14 ` Dongtao Liu
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