first question

server_1.c

+#include <iostream>
+#include <unistd.h> 
+
+
+int main(){
+    std::cout << "started" << std::endl;
+    while(1){
+        std::cout << "id: " << getpid() << std::endl;
+        std::cout << "father id: " << getppid() << std::endl;
+        std::cout << "groupd id: "  << getpgrp() << std::endl;
+        std::cout << rand() % 100 << std::endl;
+        sleep(1);
+    }
+    std::cout << "finished" << std::endl;
+
+    return EXIT_SUCCESS;
+}
+
+/*
+PPID     PID    PGID     SID TTY        TPGID STAT   UID   TIME COMMAND
+   2344    4093    4093    4093 pts/0       4191 Ss     911   0:00 /bin/zsh -i
+   4093    4191    4191    4093 pts/0       4191 S+     911   0:00 ./a.out
+   2344    4219    4219    4219 pts/1       4304 Ss     911   0:00 /bin/zsh -i
+   4219    4304    4304    4219 pts/1       4304 R+     911   0:00 ps aj
+
+
+output from the first terminal:
+id: 4191
+father id: 4093
+groupd id: 4191
+84
+4191 (group 4191)-> 4093 (group 4093) -> 2344
+
+after finishing the program in the first terminal:
+   PPID     PID    PGID     SID TTY        TPGID STAT   UID   TIME COMMAND
+   2344    4093    4093    4093 pts/0       4093 Ss+    911   0:00 /bin/zsh -i
+   2344    4219    4219    4219 pts/1       5852 Ss     911   0:00 /bin/zsh -i
+   4219    5852    5852    4219 pts/1       5852 R+     911   0:00 ps aj
+
+after relacing the program:
+
+   2344    4093    4093    4093 pts/0       6024 Ss     911   0:00 /bin/zsh -i
+   2344    4219    4219    4219 pts/1       6053 Ss     911   0:00 /bin/zsh -i
+   4093    6024    6024    4093 pts/0       6024 S+     911   0:00 ./a.out
+   4219    6053    6053    4219 pts/1       6053 R+     911   0:00 ps aj
+
+
+after killing it: (kill 6024)
+output in the first terminal:
+
+id: 6024
+father id: 4093
+groupd id: 6024
+73
+[1]    6024 terminated  ./a.out
+~/workspace: 
+
+
+*/