1 files changed, 89 insertions, 0 deletions
diff --git a/src/setup-dev.c b/src/setup-dev.c
new file mode 100644
index 0000000..e46c98d
--- /dev/null
+++ b/src/setup-dev.c
@@ -0,0 +1,89 @@
+/* 
+ * Copyright (C) 2015 Colin Walters <walters@verbum.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "config.h"
+/* Core libc/linux-headers stuff */
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/prctl.h>
+#include <sys/fsuid.h>
+#include <sys/mount.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/utsname.h>
+#include <sched.h>
+
+#include "setup-dev.h"
+#include "cleanup.h"
+
+#define N_ELEMENTS(arr)		(sizeof (arr) / sizeof ((arr)[0]))
+
+int
+setup_dev (const char  *dest_devdir)
+{
+  _cleanup_fd_close_ int src_fd = -1;
+  _cleanup_fd_close_ int dest_fd = -1;
+  struct stat stbuf;
+  unsigned int i;
+  static const char *const devnodes[] = { "null", "zero", "full", "random", "urandom", "tty" };
+
+  src_fd = openat (AT_FDCWD, "/dev", O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
+  if (src_fd == -1)
+    return -1;
+
+  if (mount ("tmpfs", dest_devdir,
+	     "tmpfs", MS_MGC_VAL | MS_PRIVATE | MS_NOSUID, "mode=0755") < 0)
+    return -1;
+
+  dest_fd = openat (AT_FDCWD, dest_devdir, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
+  if (dest_fd == -1)
+    return -1;
+
+  for (i = 0; i < N_ELEMENTS (devnodes); i++)
+    {
+      const char *nodename = devnodes[i];
+      
+      if (fstatat (src_fd, nodename, &stbuf, 0) == -1)
+	return -1;
+      if (mknodat (dest_fd, nodename, stbuf.st_mode, stbuf.st_rdev) != 0)
+        return -1;
+      if (fchmodat (dest_fd, nodename, stbuf.st_mode, 0) != 0)
+        return -1;
+    }
+
+  if (symlinkat ("/proc/self/fd/0", dest_fd, "stdin") < 0)
+    return -1;
+  if (symlinkat ("/proc/self/fd/1", dest_fd, "stdout") < 0)
+    return -1;
+  if (symlinkat ("/proc/self/fd/2", dest_fd, "stderr") < 0)
+    return -1;
+
+  return 0;
+}
+