From 422a403d7ce8b1ffb306f0f8c5b528be3fad1730 Mon Sep 17 00:00:00 2001
From: Armin Friedl <dev@friedl.net>
Date: Mon, 17 Aug 2020 00:55:45 +0200
Subject: [PATCH] Add minibomb for demonstration

---
 .drone.yml | 17 +++++++++++++++--
 Makefile   |  6 ++++++
 main.c     |  3 +++
 minibomb.c | 22 ++++++++++++++++++++++
 4 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 minibomb.c

diff --git a/.drone.yml b/.drone.yml
index e0a18e0..2c57956 100644
--- a/.drone.yml
+++ b/.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
+
diff --git a/Makefile b/Makefile
index cf57f13..5ea90d4 100644
--- a/Makefile
+++ b/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
diff --git a/main.c b/main.c
index 0542fab..5ff1648 100644
--- a/main.c
+++ b/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))) {
diff --git a/minibomb.c b/minibomb.c
new file mode 100644
index 0000000..f057735
--- /dev/null
+++ b/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);
+}