1 files changed, 38 insertions, 0 deletions
diff --git a/runcode.c b/runcode.c
new file mode 100644
index 0000000..5a69ea1
--- /dev/null
+++ b/runcode.c
@@ -0,0 +1,38 @@
+#define _POSIX_C_SOURCE 199309
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+int main(int argc, char *argv[])
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s file\n", argv[0]);
+		return 1;
+	}
+
+	int fd = open(argv[1], O_RDONLY);
+	if (fd == -1) {
+		perror("open");
+		return 1;
+	}
+
+	struct stat st;
+	if (fstat(fd, &st) == -1) {
+		perror("fstat");
+		return 1;
+	}
+
+	void *code = mmap(NULL, st.st_size, PROT_EXEC | PROT_READ | PROT_WRITE,
+		MAP_PRIVATE, fd, 0);
+
+	if (code == MAP_FAILED) {
+		perror("mmap");
+		return 1;
+	}
+
+	void (*fn)(void) = (void (*)(void))code;
+	fn();
+
+	return 0;
+}