module load crash Astrisk-11.5.1 Confbridge - c++

Question

any help ? using confbridge,conf as confbridge is way making conference same as meetme.conf
**=====================================================================
Asterisk-11.5.1 Centos6 app_confbridge.c
=====================================================================
APP: MyConfbridgeCount(Confbridgename,variablename)
it will return no of user in conference if conference is created or else zero.
Task: Using Dailplan user want to retrive no of user in conference
'6050' =>
1. Verbose(3,"testMyConfbridgeCount") [pbx_config]
2. MyConfbridgeCount(4000,count) [pbx_config]
3. verbose(3,"== ${count} ====") [pbx_config]
======================================================================
issue:Currently asterisk core dumped as soon as app2 load .
I want to load module as after join confbridge by any user , using MyConfbridgeCount() to know no of conference user count .
file: app/app_confbrige.c**
==========================================================================
partial code of app_confbridge.c:
=========================================================================
static const char *const app2 ="MyConfbridgeCount";
static int count_exec(struct ast_channel *chan, const char *data)
{
int res = 0;
struct conference_bridge *conf=NULL;
int count;
char *localdata;
char val[80] = "0";
struct ao2_iterator i;
//struct conference_bridge *bridge = NULL;
struct conference_bridge tmp;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(confno);
AST_APP_ARG(varname);
);
ast_verb(3,"\n============Inside count_exec =============\n");
if ( ast_strlen_zero(data)) {
ast_log(LOG_WARNING, "MyConfbrigeCount requires an argument (conference number)\n");
ast_verb(3, "\n MyConfbrigeCount requires an argument (conference number\n ");
return -1;
}
if (!ao2_container_count(conference_bridges)) {
ast_verb(3, "No active conferences.");
ast_log(LOG_NOTICE, "No active conferences.");
return -1;
}
if (!(localdata = ast_strdupa(data))){
return -1;
}
AST_STANDARD_APP_ARGS(args, localdata);
ast_copy_string(tmp.name, args.confno, sizeof(tmp.name));
conf = ao2_find(conference_bridges, &tmp, OBJ_POINTER);
if (conf) {
ao2_lock(conf);
count = conf->markedusers;
ao2_unlock(conf);
}else{
count = 0;
}
if (!ast_strlen_zero(args.varname)) {
snprintf(val, sizeof(val), "%d", count);
pbx_builtin_setvar_helper(chan, args.varname, val);
} else {
if ( ast_channel_state(chan)!= AST_STATE_UP) {
ast_answer(chan);
}
res = ast_say_number(chan, count, "",ast_channel_language(chan),(char *) NULL);
}
return res;
}
static int load_module(void)
{
ast_verb(3 ,"==Inside load_module==");
res |= ast_register_application_xml(app2,count_exec);
return res;
}
static int unload_module(void)
{
res |= ast_unregister_application(app2);
return res;
}
static struct ast_cli_entry cli_confbridge[] = {
AST_CLI_DEFINE(count_exec, "MyConfbrigdeCount Show Number of adminUser(s) in Conference." ),
}
============core dump=================================================
Program terminated with signal 11, Segmentation fault.
#0 __strlen_ia32 () at ../sysdeps/i386/i586/strlen.S:56
56 cmpb %dh, (%eax) /* is byte NUL? *
(gdb) bt
#0 __strlen_ia32 () at ../sysdeps/i386/i586/strlen.S:56
#1 0x00c1b4df in _IO_vfprintf_internal (s=0xfffffffe, format=<value optimized out>, ap=<value optimized out>) at vfprintf.c:1641
#2 0x00c409f0 in _IO_vsnprintf (string=0x835af1c "\374 -- \n======== inside count_exec == data is at address:[0xbf918b64] data:[nnel)\n", maxlen=<value optimized out>,
format=0xbf9175c0 "\374 -- \n======== inside count_exec == data is at address:[%p] data:[%s] ", '=' <repeats 11 times>, "\n",
args=0xbf917724 "d\213\221\277\376\377\377\377\213\261\065\b") at vsnprintf.c:120
#3 0x081a0f94 in __ast_str_helper (buf=0xbf9176a8, max_len=0, append=0,
fmt=0xbf9175c0 "\374 -- \n======== inside count_exec == data is at address:[%p] data:[%s] ", '=' <repeats 11 times>, "\n",
ap=0xbf917724 "d\213\221\277\376\377\377\377\213\261\065\b") at strings.c:76
#4 0x081b17d0 in ast_str_set_va (buf=0xbf9176a8, max_len=0,
fmt=0xbf9175c0 "\374 -- \n======== inside count_exec == data is at address:[%p] data:[%s] ", '=' <repeats 11 times>, "\n",
ap=0xbf917724 "d\213\221\277\376\377\377\377\213\261\065\b") at /usr/src/My-asterisk/asterisk-11.5.1/include/asterisk/strings.h:803
#5 0x08134a6f in __ast_verbose_ap (file=0xe1ca74 "app_confbridge.c", line=2453, func=0xe20652 "count_exec", level=3, callid=0x0,
fmt=0xbf9175c0 "\374 -- \n======== inside count_exec == data is at address:[%p] data:[%s] ", '=' <repeats 11 times>, "\n",
ap=0xbf917724 "d\213\221\277\376\377\377\377\213\261\065\b") at logger.c:1818
#6 0x08134b0b in __ast_verbose (file=0xe1ca74 "app_confbridge.c", line=2453, func=0xe20652 "count_exec", level=3,
fmt=0xe1da30 "\n======== inside count_exec == data is at address:[%p] data:[%s] ", '=' <repeats 11 times>, "\n") at logger.c:1836
#7 0x00e09a45 in count_exec (chan=0xe23c18, data=0xfffffffe <Address 0xfffffffe out of bounds>) at app_confbridge.c:2453
#8 0x080d40eb in __ast_cli_register (e=0xe23c18, ed=0x0) at cli.c:2118
#9 0x080d4459 in ast_cli_register (e=0xe23c18) at cli.c:2178
#10 0x080d4482 in ast_cli_register_multiple (e=0xe237a0, len=13) at cli.c:2189
#11 0x00e11f7d in load_module () at app_confbridge.c:4771
#12 0x0812ba89 in start_resource (mod=0x87fa908) at loader.c:845
#13 0x0812c45c in load_resource_list (load_order=0xbf918e90, global_symbols=0, mod_count=0xbf918e88) at loader.c:1045
#14 0x0812ca5a in load_modules (preload_only=0) at loader.c:1198
#15 0x080895f7 in main (argc=4, argv=0xbf91a3a4) at asterisk.c:4180

Answer 1

As i underestand you created NEW application MyConfbridgeCount,right?
And you are not voip nor c++ expert.
If so, recommended way is use GROUP functions to calculate number of channels BEFORE confbridge. That can be done via pure dialplan.
Creating c/c++ app require very carefull coding and multithreaded debugging(which is extreamly complex thing).
If you realy care what is your error - your error is sending to printf function incorrect address of string.