From 4e09bca9e34c226b6d7e34b4fa11248405fd988e Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 22 Oct 2023 19:50:38 +0200
Subject: Move everything into a new repo.

---
 userland/minibox/utilities/init.c | 72 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 userland/minibox/utilities/init.c

(limited to 'userland/minibox/utilities/init.c')

diff --git a/userland/minibox/utilities/init.c b/userland/minibox/utilities/init.c
new file mode 100644
index 0000000..35bedf2
--- /dev/null
+++ b/userland/minibox/utilities/init.c
@@ -0,0 +1,72 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pty.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int cmdfd;
+
+void execsh(void) {
+  char *argv[] = {NULL};
+  execv("/sh", argv);
+}
+
+void newtty(void) {
+  int m;
+  int s;
+  openpty(&m, &s, NULL, NULL, NULL);
+  int pid = fork();
+  if (0 == pid) {
+    dup2(s, 0);
+    dup2(s, 1);
+    dup2(s, 2);
+    execsh();
+    return;
+  }
+  close(s);
+  cmdfd = m;
+}
+
+void shell() {
+  struct pollfd fds[2];
+  fds[0].fd = cmdfd;
+  fds[0].events = POLLIN;
+  fds[0].revents = 0;
+  fds[1].fd = open("/dev/keyboard", O_RDONLY, 0);
+  fds[1].events = POLLIN;
+  fds[1].revents = 0;
+  for (;; fds[0].revents = fds[1].revents = 0) {
+    poll(fds, 2, 0);
+    if (fds[0].revents & POLLIN) {
+      char c[4096];
+      int rc = read(fds[0].fd, c, 4096);
+      assert(rc > 0);
+      for (int i = 0; i < rc; i++)
+        putchar(c[i]);
+    }
+    if (fds[1].revents & POLLIN) {
+      char c;
+      int rc = read(fds[1].fd, &c, 1);
+      assert(rc > 0);
+      write(cmdfd, &c, 1);
+      //      putchar(c);
+    }
+  }
+}
+
+int init_main(void) {
+  if (1 != getpid()) {
+    printf("minibox init must be launched as pid1.\n");
+    return 1;
+  }
+  if (fork())
+    for (;;)
+      wait(NULL);
+  char *a[] = {NULL};
+  execv("/term", a);
+  return 1;
+}
-- 
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