From d44cb96a76b1c5b410aed2fd270cdc6bbe85dc5a Mon Sep 17 00:00:00 2001
From: Shrinivas Kamath <shrkamat@cisco.com>
Date: Thu, 3 Aug 2017 20:49:43 +0530
Subject: [PATCH] Evaluating valgrind in multiprocess scenarios

---
 CMakeLists.txt | 10 ++++++++++
 README         |  6 ++++++
 childA.c       | 12 ++++++++++++
 childB.c       | 14 ++++++++++++++
 parent.c       | 34 ++++++++++++++++++++++++++++++++++
 5 files changed, 76 insertions(+)
 create mode 100644 CMakeLists.txt
 create mode 100644 README
 create mode 100644 childA.c
 create mode 100644 childB.c
 create mode 100644 parent.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..ac6e76f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required (VERSION 2.8.11)
+
+set (CMAKE_BUILD_TYPE Debug)
+# Add -O0 to remove optimizations when using gcc
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0")
+set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0")
+
+add_executable (parent parent.c)
+add_executable (childA childA.c)
+add_executable (childB childB.c)
diff --git a/README b/README
new file mode 100644
index 0000000..138e63a
--- /dev/null
+++ b/README
@@ -0,0 +1,6 @@
+RUNNING WITH VALGRIND
+=====================
+
+mkdir -p build
+cd build; cmake ..; make
+valgrind --trace-children=yes --leak-check=full --show-reachable=yes --error-limit=no --log-file=valgrind.log ./parent
diff --git a/childA.c b/childA.c
new file mode 100644
index 0000000..d283b00
--- /dev/null
+++ b/childA.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <string.h>
+#define WELCOME_MSG "Hello, from child A\n"
+
+int main (int argc, char *argv[])
+{
+    char *str = strdup (WELCOME_MSG);
+
+    printf ("%s", str);
+
+    return 0;
+}
diff --git a/childB.c b/childB.c
new file mode 100644
index 0000000..0925f7e
--- /dev/null
+++ b/childB.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main (int argc, char *argv[])
+{
+    int i = 0;
+    printf ("Hello, from child A\n");
+
+    while (i < argc) {
+        printf ("%s\n", argv[i]);
+        i++;
+    }
+
+    return 0;
+}
diff --git a/parent.c b/parent.c
new file mode 100644
index 0000000..74b7601
--- /dev/null
+++ b/parent.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <string.h>
+
+#define PARENT_MEM_LEAK
+
+#define WELCOME_MSG "Hello, World\n"
+
+void launch(char *app)
+{
+    pid_t pid;
+
+    if ((pid = fork()) == 0) {
+        /* child */
+        execl(app, app, NULL);
+        perror ("app spawn failed\n");
+    } else {
+        /* parent, wait for child to exit */
+        int status = 0;
+        waitpid(pid, &status, 0);
+    }
+}
+
+int main( void )
+{
+#ifdef PARENT_MEM_LEAK
+    char *c = strdup (WELCOME_MSG);
+#else
+    char *c = WELCOME_MSG;
+#endif
+    printf ("%s", c);
+    launch ("childA");
+}