Add an example of zombie process

Author: coditva

README.md

@@ -10,6 +10,7 @@ course in Bits, Goa.
 - Fork this shit: examples of forking
 - Kernel Modules: kernel modules
 - Process communication: process communication
+- Zombie: make a zombie
 
 ## Author
 Utkarsh Maheshwari

zombie/Makefile

@@ -0,0 +1,16 @@
+
+# Add all targets here
+BINARIES=zombie
+
+all: $(BINARIES)
+
+
+zombie: zombie.o
+	gcc -o zombie zombie.o
+zombie.o: zombie.c
+	gcc zombie.c -c
+
+
+.PHONY: clean
+clean:
+	rm -f *.o $(BINARIES)

zombie/README.md

@@ -0,0 +1,13 @@
+## Zombie
+Makes a zombie process
+
+#### Compile:
+- all:
+```bash
+make all
+```
+
+- selectively, 'package':
+```bash
+make package
+```

zombie/zombie.c

@@ -0,0 +1,29 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+    pid_t pid, me;
+    pid = fork();
+
+    if (pid == 0) {
+        me = getpid();
+        printf("%d: I love eating brains\n", me);
+        printf("%d: I am a zombie!\n", me);
+    } else {
+        me = getpid();
+
+        printf("%d: Killing my child\n", me);
+        printf("%d: Damn! He's a zombie now!\n", me);
+
+        /* sleep so that my child becomes a zombie */
+        sleep(20);
+        wait(NULL);
+
+        printf("%d: Not anymore\n", me);
+    }
+
+    return 0;
+}