From 7a98e998c5cda484611d19854649ab8535f503d4 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Tue, 14 Feb 2023 17:09:59 +0100
Subject: add simplet init system

---
 lib/exec/exec.c   | 38 ++++++++++++++++++++++++++++++++++++++
 lib/exec/exec.h   |  6 ++++++
 lib/sys/unmount.h | 11 +++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 lib/exec/exec.c
 create mode 100644 lib/exec/exec.h
 create mode 100644 lib/sys/unmount.h

(limited to 'lib')

diff --git a/lib/exec/exec.c b/lib/exec/exec.c
new file mode 100644
index 0000000..42fd2c1
--- /dev/null
+++ b/lib/exec/exec.c
@@ -0,0 +1,38 @@
+#include "exec.h"
+#include "../sys/execve.h"
+#include "../env/env.h"
+#include "../cstr/cstr.h"
+#include "../malloc/malloc.h"
+
+int exec(const char **argv)
+{
+	const char *path = getenv("PATH");
+	const char *end;
+	char *filename;
+
+	while (*path) {
+		end = path;
+
+		while (*end && *end != ':') ++end;
+
+		filename = malloc((end - path) + cstr_length(argv[0]) + 2);
+
+		for (int i = 0; i < end - path; ++i)
+			filename[i] = path[i];
+
+		filename[end - path] = '/';
+
+		for (int i = 0; i < cstr_length(argv[0]) + 1; ++i)
+			filename[(end - path) + i + 1] = argv[0][i];
+
+		execve(filename, argv, getenvp());
+		free(filename);
+
+		path = end;
+
+		if (*path == ':')
+			++path;
+	}
+
+	return execve(argv[0], argv, getenvp());
+}
diff --git a/lib/exec/exec.h b/lib/exec/exec.h
new file mode 100644
index 0000000..fe7e811
--- /dev/null
+++ b/lib/exec/exec.h
@@ -0,0 +1,6 @@
+#ifndef EXEC_H
+#define EXEC_H
+
+int exec(const char **argv);
+
+#endif
diff --git a/lib/sys/unmount.h b/lib/sys/unmount.h
new file mode 100644
index 0000000..1331e65
--- /dev/null
+++ b/lib/sys/unmount.h
@@ -0,0 +1,11 @@
+#ifndef UNMOUNT_H
+#define UNMOUNT_H
+
+#include "syscalls.h"
+
+int unmount(char *pathname, int flags)
+{
+	return syscall(UMOUNT2, pathname, flags);
+}
+
+#endif
-- 
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