On 29.11.2011 11:32, ShaoHe Feng wrote:
When I to use gdb to check whether qemuMonitorJSONIOProcessEvent
processes the Event that I expect.
but the gdb works abnormally.
I list the the position of the source file by gdb. It is the correct
functionqemuMonitorJSONIOProcessEvent.
However I set break point on this position. then "info b", it is the
wrong function qemuMonitorJSONIOProcess.
I debug my libvirt on Ubuntu 11.10 this time.But I have set a break
point at this function on redhat 6.0 before, it can work well.
My gcc version is: gcc (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1
My gdb version is: GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
here is the info:
(gdb) list qemu/qemu_monitor_json.c:88
83 qemuMonitorJSONIOProcessEvent(qemuMonitorPtr mon,
84 virJSONValuePtr obj)
85 {
86 const char *type;
87 int i;
88 int findEventFlag = -1;
89 VIR_DEBUG("mon=%p obj=%p", mon, obj);
90
91 type = virJSONValueObjectGetString(obj, "event");
92 if (!type) {
(gdb) b qemu/qemu_monitor_json.c:88
Breakpoint 5 at 0x4a18d4: file qemu/qemu_monitor_json.c, line 88.
(gdb) info b
Num Type Disp Enb Address What
5 breakpoint keep y 0x00000000004a18d4 in
qemuMonitorJSONIOProcess at qemu/qemu_monitor_json.c:88
(gdb)
This may be caused by libvirtd being compiled with -O2; You want to turn
that off:
1) get libvirt sources, unpack them and cd <unpacked sources>
2) export CFLAGS='-O0'
3) ./autogen --system && make
Now you should have libvirtd in ./daemon/libvirtd; However, this is
libtool wrapper script. So you won't succeed running it directly (gdb
./daemon/libvirtd); I personally use attach: gdb -p $(pgrep libvirtd);
NB, you should shutdown your system libvirtd: service libvirtd shutdown
Michal