logout desktop session,process is not kill?

[lovelinux <xiaoaojianghu_ai 163 com>]

I design a program.it's always loop until.
for example
#include <stdio.h>
#include <stdlib.h>
int main(int argc,char** argv)
{
    while(1)
         sleep(1);
   return 0;
}
User logout desktop session,again login desktop session,this process still
exists but look like not run.
When logout desktop session,which signal will be send to all process?
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