1 files changed, 63 insertions, 0 deletions
diff --git a/chroot.c b/chroot.c
new file mode 100644
index 0000000..58b0d37
--- /dev/null
+++ b/chroot.c
@@ -0,0 +1,63 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2022, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/* TODO: track down XPG/3 or 4 for more details on requirements */
+
+#define _XOPEN_SOURCE 400
+#define _XOPEN_SOURCE_EXTENDED 1
+#include <errno.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define UTILITY_NOT_INVOKED	(126)
+#define UTILITY_NOT_FOUND	(127)
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+	while (getopt(argc, argv, "") != -1) {
+		return 1;
+	}
+
+	if (optind >= argc - 1) {
+		fprintf(stderr, "chroot: missing operand\n");
+		return UTILITY_NOT_INVOKED;
+	}
+
+	if (chroot(argv[optind++]) != 0) {
+		perror("chroot");
+		return UTILITY_NOT_INVOKED;
+	}
+
+	execvp(argv[optind], argv + optind);
+
+	fprintf(stderr, "chroot: %s: %s\n", argv[optind], strerror(errno));
+	return errno == ENOENT ? UTILITY_NOT_FOUND : UTILITY_NOT_INVOKED;
+}