make dummy target children and siblings (threads)

src/dummy_target.cpp

@@ -1,16 +1,69 @@
 #include <unistd.h>
+#include <sys/wait.h>
+#include <pthread.h>
 #include <stdio.h>
 
 extern char *program_invocation_name;
 extern char *program_invocation_short_name;
 
+void status(const char* tag)
+{
+    printf("[%s] pid: %d\n", tag, getpid());
+    printf("[%s] program_invocation_name: %s\n", tag, program_invocation_name);
+    printf("[%s] program_invocation_short_name: %s\n", tag, program_invocation_short_name);
+}
+
+__attribute__((noreturn)) void slave1_job()
+{
+    status("slave1");
+
+    puts("[slave1] waiting for any key...");
+    getc(stdin);
+    
+    _exit(0);
+}
+
+__attribute__((noreturn)) void slave2_job()
+{
+    status("slave2");
+
+    puts("[slave2] will do something each second");
+    while (true)
+    {
+        __asm__("nop");
+        sleep(1);
+    }
+}
+
+__attribute__((noreturn)) void* slave3_job(void*)
+{
+    status("slave3");
+
+    puts("[slave3] will do something each second but in a thread");
+    while (true)
+    {
+        __asm__("nop");
+        sleep(1);
+    }
+
+    return NULL;
+}
+
 int main()
 {
-    printf("pid: %d\n", getpid());
-    printf("program_invocation_name: %s\n", program_invocation_name);
-    printf("program_invocation_short_name: %s\n", program_invocation_short_name);
+    status("master");
 
-    puts("waiting for any key...");
-    getc(stdin);
+    pid_t slave1 = fork();
+    if (!slave1) slave1_job();
+
+    pid_t slave2 = fork();
+    if (!slave2) slave2_job();
+
+    pthread_t slave3;
+    pthread_create(&slave3, NULL, slave3_job, NULL);
+
+    waitpid(slave1, NULL, 0);
+    waitpid(slave2, NULL, 0);
+    pthread_join(slave3, NULL);
     return 0;
 }