Greetings,
I've recently started working at developing apache modules, and while
finding it interesting, have recently run into a rather annoying issue. I
appear to get unusual GDB output, where the code repeats sections multiple
times(despite there being no loop) and sometimes just making big skips, and
most commands (print in particular) outright not working. Adding sample
output to the end of this message.
I've only taken the jump from development in a windows environment using
VC++ recently, and am far from an expert in configuring build environments,
though I've read through the docs. During debug I run with -X, and
everything, including apache is compiled with -g. I used apxs to compile and
install the module itself with the following command.
sudo /usr/local/apache2/bin/apxs -c -i mod_ninja_access.c
I've read the chapter on module debugging in "The apache modules book", as
well as a couple of articles, however have not found any mention of such an
issue in them. I've also tried googling and checking the archives for
similar issues but had no luck. I suspect this is some kind of configuration
issue, and wondering if anyone else has encountered a similar issue or would
be able to help?
I post here and not on a gdb mailing list as I've had no problems with other
environments, so I'm assuming it may be specific to how I'm setting up my
module?
Thanks for reading,
Juhani Connolly
Sample output from gdb here:
This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db
library "/lib/i686/nosegneg/libthread_db.so.1".
(gdb) r -X
Starting program: /usr/local/apache2/bin/httpd -X
[Thread debugging using libthread_db enabled]
[New Thread -1208711424 (LWP 8068)]
Program received signal SIGINT, Interrupt.
[Switching to Thread -1208711424 (LWP 8068)]
0x00e3a402 in __kernel_vsyscall ()
(gdb) break mna_
mna_create_svr_conf mna_hook_child_init mna_hook_handler mna_srv_conf
(gdb) break mna_
mna_create_svr_conf mna_hook_child_init mna_hook_handler mna_srv_conf
(gdb) break mna_hook_handler
Breakpoint 1 at 0x15b44e: file mod_ninja_access.c, line 506.
(gdb) c
Continuing.
Breakpoint 1, mna_hook_handler (r=0x86513e8) at mod_ninja_access.c:506
warning: Source file is more recent than executable.
506 if (!strcmp(r->handler, "ninja_access"))
(gdb) n
505 {
(gdb) n
506 if (!strcmp(r->handler, "ninja_access"))
(gdb) n
510 else if(!strcmp(r->handler, "ninja_js"))
(gdb) s
188 mna_srv_conf* svr =
ap_get_module_config(r->server->module_config, &ninja_access_module);
(gdb) n
190 pathinfo = (char*)apr_pstrdup(r->pool,
r->uri+strlen(svr->thisScript));
(gdb) n
188 mna_srv_conf* svr =
ap_get_module_config(r->server->module_config, &ninja_access_module);
(gdb) p pathinfo
No symbol "pathinfo" in current context.
(gdb) n
190 pathinfo = (char*)apr_pstrdup(r->pool,
r->uri+strlen(svr->thisScript));
(gdb) n
191 if(pathinfo == NULL)
(gdb) p pathinfo
No symbol "pathinfo" in current context.
(gdb) n
190 pathinfo = (char*)apr_pstrdup(r->pool,
r->uri+strlen(svr->thisScript));
(gdb) n
191 if(pathinfo == NULL)
(gdb) n
342 ap_log_error(APLOG_MARK, APLOG_WARNING, rv,
r->server, "[ninja_access] Couldn't open js file %s", svr->jsFile);
(gdb) n
516 }
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