commit 7ed3ffc7ea4000096e7253fdb741f55903fd14b3
Author: snow flurry <snow@datagirl.xyz>
Date:   Wed Jan 26 12:39:00 2022 -0800

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bdcddbf
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,25 @@
+.PHONY: all
+all: build/parent-null build/parent-ptr build/child
+
+build:
+	@mkdir -p build
+
+build/parent-null: build
+	$(CC) -o build/parent-null src/parent.c
+
+build/parent-ptr: build
+	$(CC) -o build/parent-ptr -DPTR_TO_NULL src/parent.c
+
+build/child: build
+	$(CC) -o build/child src/child.c
+
+.PHONY: test
+test: all
+	@echo "==> Testing execve with { NULL }..."
+	./build/parent-ptr ./build/child
+	@echo "==> Testing execve with NULL..."
+	./build/parent-null ./build/child
+
+.PHONY: clean
+clean:
+	@rm -fr build
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1d95bde
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+# argv0-test
+
+Simple tester for weird execve calls.
+
+## How to use
+```
+$ make test
+```
diff --git a/src/child.c b/src/child.c
new file mode 100644
index 0000000..c0ef351
--- /dev/null
+++ b/src/child.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int
+main(int argc, char *argv[]) {
+    printf("childproc: argc == %d!\n", argc);
+    return 0;
+}
diff --git a/src/parent.c b/src/parent.c
new file mode 100644
index 0000000..a95c239
--- /dev/null
+++ b/src/parent.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv, char **envp)
+{
+    char *arr = NULL;
+    char **ptr = 
+#ifdef PTR_TO_NULL
+        &arr;
+    printf("%s: using &NULL as argv...\n", argv[0]);
+#else
+        NULL;
+    printf("%s: using just NULL as argv...\n", argv[0]);
+#endif
+    printf("%s: argv == %p\n", argv[0], ptr);
+    execve(argv[1], ptr, envp);
+
+    return 0;
+}