1 files changed, 74 insertions, 0 deletions
diff --git a/lib/mknod.c b/lib/mknod.c
new file mode 100644
index 0000000..688f0fb
--- /dev/null
+++ b/lib/mknod.c
@@ -0,0 +1,74 @@
+/* Create a device inode.
+   Copyright (C) 2009-2023 Free Software Foundation, Inc.
+
+   This file 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 3 of the
+   License, or (at your option) any later version.
+
+   This file 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 program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* written by Eric Blake */
+
+#include <config.h>
+
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <string.h>
+
+#if !HAVE_MKNOD
+/* Mingw lacks mknod; always fail with ENOSYS.  */
+
+int
+mknod (_GL_UNUSED char const *name, _GL_UNUSED mode_t mode,
+       _GL_UNUSED dev_t dev)
+{
+  errno = ENOSYS;
+  return -1;
+}
+
+#else /* HAVE_MKNOD */
+
+# undef mknod
+
+/* Create a file system node FILE, with access permissions and file
+   type in MODE, and device type in DEV.  Usually, non-root
+   applications can only create named fifos (mode includes S_IFIFO),
+   with DEV set to 0.  Also work around trailing slash bugs.  */
+
+int
+rpl_mknod (char const *name, mode_t mode, dev_t dev)
+{
+# if MKFIFO_TRAILING_SLASH_BUG
+  /* Trailing slash only makes sense for directories.  Of course,
+     using mknod to create a directory is not very portable, so it may
+     still fail later on.  */
+  if (!S_ISDIR (mode))
+    {
+      size_t len = strlen (name);
+      if (len && name[len - 1] == '/')
+        {
+          struct stat st;
+          if (stat (name, &st) == 0 || errno == EOVERFLOW)
+            errno = EEXIST;
+          return -1;
+        }
+    }
+# endif
+# if MKNOD_FIFO_BUG
+  /* POSIX requires mknod to create fifos for non-privileged
+     processes, but BSD implementations fail with EPERM.  */
+  if (S_ISFIFO (mode) && dev == 0)
+    return mkfifo (name, mode & ~S_IFIFO);
+# endif
+  return mknod (name, mode, dev);
+}
+
+#endif /* HAVE_MKNOD */