From 55cd5da33c56ba4e8bbeb84d535a73dd724fdde5 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ungol.org>
Date: Tue, 31 Mar 2020 18:06:23 -0400
Subject: first actual implementation

---
 getty.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)

diff --git a/getty.c b/getty.c
index e69de29..45ff830 100644
--- a/getty.c
+++ b/getty.c
@@ -0,0 +1,100 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2020 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.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef DEFAULT_GETTY_COMMAND
+#define DEFAULT_GETTY_COMMAND "/sys/bin/login"
+#endif
+
+#ifndef DEFAULT_GETTY_DEVICE
+#define DEFAULT_GETTY_DEVICE "/dev/console"
+#endif
+
+#ifndef DEFAULT_GETTY_TYPE
+#define DEFAULT_GETTY_TYPE "ecma-48"
+#endif
+
+int main(int argc, char *argv[])
+{
+	
+	char *command = DEFAULT_GETTY_COMMAND;
+	char *device = DEFAULT_GETTY_DEVICE;
+	char *type = DEFAULT_GETTY_TYPE;
+
+	int c;
+	while ((c = getopt(argc, argv, "e:d:T:")) != -1) {
+		switch (c) {
+		case 'e':
+			command = optarg;
+			break;
+
+		case 'd':
+			device = optarg;
+			break;
+
+		case 'T':
+			type = optarg;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (argc > optind) {
+		fprintf(stderr, "getty: unexepcted operands\n");
+		return 1;
+	}
+
+	int fd = open(device, O_RDWR, 0600);
+	if (fd == -1) {
+		fprintf(stderr, "getty: %s: %s\n", device, strerror(errno));
+		return 1;
+	}
+
+	if (!isatty(fd)) {
+		fprintf(stderr, "getty: %s: %s\n", device, strerror(errno));
+		return 1;
+	}
+
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+	dup2(fd, STDIN_FILENO);
+	dup2(fd, STDOUT_FILENO);
+	dup2(fd, STDERR_FILENO);
+	close(fd);
+
+	setenv("TERM", type, 1);
+	/* TODO: wordexp() + execv() */
+	execl("/bin/sh", "/bin/sh", "-c", command, (char*)NULL);
+	return 1;
+}
-- 
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