Hi Petr, as promised here my first impressions on ltrace v0.7.0-git on my MIPSEL router.
I have built ltrace statically against libelf-0.8.13,
libstdc++.so.6.0.16 and etc.(see attached patch).
Then, I uploaded ltrace binary together with upstream's ltrace.conf to
/var/tmp/{etc}.
Unfortunately, ltrace fails when tracing running daemons or ELF binaries.
I played a bit with --debug=LEVEL... I could see that the new config
is used (required!) but using other parameters flooded here my box.
Can you help with debugging?
You need more feedback?
Regards,
- Sedat -
[ Some general informations ]
root@fritz:/# cat /proc/version
Linux version 2.6.13.1-ohio () (gcc version 3.4.6) #1 Tue Mar 27
16:53:06 CEST 2012
root@fritz:/# cat /proc/cpuinfo
system type : MIPS OHIO
processor : 0
cpu model : MIPS 4KEc V4.8
BogoMIPS : 211.35
wait instruction : yes
microsecond timers : yes
tlb_entries : 16
extra interrupt vector : yes
hardware watchpoint : yes
VCED exceptions : not available
VCEI exceptions : not available
root@fritz:/# cat /proc/meminfo
MemTotal: 30204 kB
MemFree: 1696 kB
Buffers: 3236 kB
Cached: 11032 kB
SwapCached: 0 kB
Active: 9260 kB
Inactive: 9292 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 30204 kB
LowFree: 1696 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 9024 kB
Slab: 5900 kB
CommitLimit: 15100 kB
Committed_AS: 6852 kB
PageTables: 276 kB
VmallocTotal: 1048560 kB
VmallocUsed: 3672 kB
VmallocChunk: 1043636 kB
root@fritz:/# cat /proc/devices
Character devices:
255 avm_net_trace
1 mem
2 pty
3 ttyp
4 ttyS
5 /dev/tty
5 /dev/console
5 /dev/ptmx
10 misc
13 input
68 capi_oslib
90 mtd
128 ptm
136 pts
226 kdsld_traffic
229 kdsld_user
230 tiatm
240 tffs
241 avm_event
242 watchdog
243 kdsld
244 kdsldptrace
245 ubik2
246 debug
251 avm_led
252 avm_power
254 kdsld_misc
Block devices:
31 mtdblock
[ Start ltrace session ]
root@fritz:/# ls -l /var/tmp/ltrace /var/tmp/etc/ltrace.conf
-rw-r--r-- 1 root root 15598 Sep 2 15:49
/var/tmp/etc/ltrace.conf
-rwxr-xr-x 1 root root 297220 Sep 2 15:49 /var/tmp/ltrace
root@fritz:/# ldd /var/tmp/ltrace
not a dynamic executable
root@fritz:/# /var/tmp/ltrace --help
Usage: /var/tmp/ltrace [option ...] [command [arg ...]]
Trace library calls of a given program.
-a, --align=COLUMN align return values in a secific column.
-A ARRAYLEN maximum number of array elements to print.
-b, --no-signals don't print signals.
-c count time and calls, and report a summary on exit.
-C, --demangle decode low-level symbol names into user-level names.
-D, --debug=LEVEL enable debugging (see -Dh or --debug=help).
-Dh, --debug=help show help on debugging.
-e expr modify which events to trace.
-f trace children (fork() and clone()).
-F, --config=FILE load alternate configuration file (may be repeated).
-g, --no-plt disable breakpoints on PLT entries.
-h, --help display this help and exit.
-i print instruction pointer at time of library call.
-l, --library=FILE print library calls from this library only.
-L do NOT display library calls.
-n, --indent=NR indent output by NR spaces for each call level nesting.
-o, --output=FILE write the trace output to that file.
-p PID attach to the process with the process ID pid.
-r print relative timestamps.
-s STRLEN specify the maximum string size to print.
-S display system calls.
-t, -tt, -ttt print absolute timestamps.
-T show the time spent inside each call.
-u USERNAME run command with the userid, groupid of username.
-V, --version output version information and exit.
-x NAME treat the global NAME like a library subroutine.
Report bugs to [email protected]
root@fritz:/# /var/tmp/ltrace --version
ltrace version 0.7.0-git.
Copyright (C) 1997-2009 Juan Cespedes <[email protected]>.
This is free software; see the GNU General Public Licence
version 2 or later for copying conditions. There is NO warranty.
root@fritz:/# ps w | grep d[s]ld
621 root 0 RWN [kdsld_token]
575 root 4000 S dsld -g -i -n
root@fritz:/# /var/tmp/ltrace --config=/var/tmp/etc/ltrace.conf -p $(pidof dsld)
--- SIGSTOP (Stopped (signal)) ---
--- SIGSTOP (Stopped (signal)) ---
root@fritz:/# /var/tmp/ltrace --config=/var/tmp/etc/ltrace.conf /sbin/dsltest
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
unexpected breakpoint at 0x2acaf3d8
+++ exited (status 3) +++
root@fritz:/# /var/tmp/ltrace --debug=help
/var/tmp/ltrace debugging option, --debug=<octal> or -D<octal>:
number ref. in source description
1 general Generally helpful progress information
10 event Shows every event received by a traced process
20 process Shows actions carried upon a traced processes
40 function Shows every entry to internal functions
Debugging options are mixed using bitwise-or.
Note that the meanings and values are subject to change.
- EOS (End Of Session) -
0001-ltrace-Switch-to-static-build-by-default.patch
Description: Binary data
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