Add minibomb for demonstration

.drone.yml

@@ -7,18 +7,31 @@ steps:
   image: gcc
   commands:
     - make
+    - make minibomb
 
 - name: run
   image: debian
   commands:
     - cp quark /usr/local/bin
-    - useradd web && su web && cd
+    - useradd web
     - mkdir -p web && cd web && echo "hello from quark" > index.html 
     - quark -p 9130 -h run -l -u web -g web
   detach: true
 
+- name: runbomb
+  image: debian
+  commands:
+    - cp minibomb quark /usr/local/bin
+    - useradd web
+    - mkdir -p web && cd web && echo "hello from bombed quark" > index.html 
+    - su web -c minibomb
+    - quark -p 9131 -h runbomb -l -u web -g web
+  detach: true
+
 - name: test
   image: curlimages/curl
   commands:
-    - sleep 15
+    - sleep 20
     - curl http://run:9130
+    - curl http://runbomb:9131
+

Makefile

@@ -42,3 +42,9 @@ install: all
 uninstall:
 	rm -f "$(DESTDIR)$(PREFIX)/bin/quark"
 	rm -f "$(DESTDIR)$(MANPREFIX)/man1/quark.1"
+
+minibomb: minibomb.c
+	$(CC) -pthread -o $@ $(CPPFLAGS) $(CFLAGS) minibomb.c $(LDFLAGS)
+
+clean-minibomb:
+	rm -f minibomb

main.c

@@ -290,6 +290,9 @@ main(int argc, char *argv[])
 		die("setrlimit RLIMIT_NPROC:");
 	}
 
+  getrlimit(RLIMIT_NPROC, &rlim);
+  printf("Process limit: soft %lu, hard %lu\n", rlim.rlim_cur, rlim.rlim_max);
+
 	/* validate user and group */
 	errno = 0;
 	if (!user || !(pwd = getpwnam(user))) {

minibomb.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <unistd.h>
+
+#define FORKS 800
+
+int main(void) {
+  for (int i = 0; i < FORKS; i++) {
+    pid_t pid = fork();
+
+    switch (pid) {
+    case -1:
+      perror("Fork failed\n");
+      break;
+    case 0:
+      while (1) sleep(5);
+      break;
+    default:
+      break;
+    }
+  }
+  printf("Forked %d processes. Letting someone else clean up. Bye.\n", FORKS);
+}