[PLUG] Closing sockets using atexit C code.

[michael]

Thank you.  Another question, how can I tell if the program opening
sockets is crashing enough times to cause problems for other processes?
My hypothesis is that this program opens 3 sockets and crashes, sockets
linger for a while.  Do this n times, the Pi starts to have problems.
If the Pi is resource starved, that will affect the NFS server running
on it.

On 2017-11-14 12:48, John Meissen wrote:
> Sockets are just file descriptors. All file descriptors should be 
> closed
> automatically as part of the process termination cleanup that the 
> system does.
> 
> While it's good practice to handle these sorts of things they will 
> happen
> automatically if you don't.
> 
>> In C there is an atexit function that takes no arguments.  Because of
>> this, you can't pass in the
>> file descriptors for your sockets.  Uge!  Short of making these 
>> integers
>> global, how can I close
>> these sockets on premature program termination?
>> 
>> int client=0,server=0;
>> 
>> void exiting()
>> {
>>      close(client);
>>      close(server);
>> }
>> 
>> int main(void)
>> {
>>      atexit(exiting);
>> 
>>      struct sockaddr...
>> }
>> 
>> Note that there are a bunch of includes for TCP sockets and a lot more
>> code.
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> 
> 
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