Re: GSM_CancelCall not found

Michal Čihař <[email protected]> Tue, 2 Aug 2016 17:06:19 +0200
Newsgroups	gmane.linux.drivers.gammu
Message-ID	<[email protected]>
Hi

Dne 30.7.2016 v 21:00 Paulo Roberto napsal(a):
> Hello Guys,
> I do need your help to solve this issue.
> I made some progress since the last e-mail. I fetched the last source
> code of gammu (commit: 70ab47136f12be6478b3892f43b913d2a23a3274), built
> it and test it with my application.
> 
> I'm still unable to Cancel the calls but it is a totally different issue.
> The /s->Phone.Functions/ is initialized correctly and it's not /NULL/
> anymore. And for the phone /Samsung GT-E2220/ the /GSM_CancelCall/ 
> registered function is  /ATGEN_CancelCall/
> 
> The problem now is a stack overflow.
> My /Incoming Call Callback/ routine, calls /GSM_CancelCall/ and this one
> indirectly call back my /Incoming Call Callback/ routine. A kind of a
> recursive infinite loop.
> The process continues until there is no space left on the stack and the
> OS kills the process.
> 
> Inside my callback I do test the condition:  /call->Status ==
> GSM_CALL_IncomingCall (/Where call is the /GSM_Call/ parameter received)
> but for this situation is useless.
> 
> I'm able to avoid this problem by setting a static variable to control
> the condition if it is a reentrant call. But it makes my routine not
> reentrant anymore.
> Besides that, this behavior is different from the Python implementation
> where everything works as expected.

The Python API hides some ugliness of the C API. On of things it does is
that the callbacks are executed at different point.

> When the device receives the call, the read message from it is:
> 
> "+CLIP: \"099999999999\",129,\"\",,\"Promocoes Vivo\",0\r\nAT+CSQ\r\r"
> 
> Below, there is the stack backtrace of my application. I stopped it
> exactly where my callback function calls the GSM_CancelCall for the
> second time.
> 
> #0  GSM_CancelCall (s=0x7ffff5e1d010, ID=0, all=1) at
> git/gammu/gammu/libgammu/api.c:913

This line is comment in current git, have you modified the file somehow?

BTW: You can look at similar code in Gammu SMSD, which works:

https://github.com/gammu/gammu/blob/master/smsd/core.c#L1877

-- 
	Michal Čihař | http://cihar.com/ | https://weblate.org/

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