From a3e03be058a9b9a2caf36c5b18f66c0fc3df3bf0 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Tue, 8 May 2001 19:58:20 +0000
Subject: Add in libutil, based on Cory Visi's variant of Michael Shmulevich's
 libutil port.  I have reworked the code quite a bit so that the stuff that is
 supposed to be in libc is in libc, and I added a bunch of missing stuff so
 the libutil interface matches that of glibc's libutil.  The only caveat is
 that libutil/login.c is currently a stub.  -Erik

---
 libc/stdlib/grantpt.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 libc/stdlib/grantpt.c

(limited to 'libc/stdlib/grantpt.c')

diff --git a/libc/stdlib/grantpt.c b/libc/stdlib/grantpt.c
new file mode 100644
index 000000000..63f423b8f
--- /dev/null
+++ b/libc/stdlib/grantpt.c
@@ -0,0 +1,66 @@
+/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/statfs.h>
+
+/* Constant that identifies the `devpts' filesystem.  */
+#define DEVPTS_SUPER_MAGIC	0x1cd1
+/* Constant that identifies the `devfs' filesystem.  */
+#define DEVFS_SUPER_MAGIC	0x1373
+
+/* Prototype for function that changes ownership and access permission
+   for slave pseudo terminals that do not live on a `devpts'
+   filesystem.  */
+int __unix_grantpt (int fd);
+
+/* Prototype for private function that gets the name of the slave
+   pseudo terminal in a safe way.  */
+static int pts_name (int fd, char **pts, size_t buf_len);
+
+/* Change the ownership and access permission of the slave pseudo
+   terminal associated with the master pseudo terminal specified
+   by FD.  */
+int
+grantpt (int fd)
+{
+  struct statfs fsbuf;
+#ifdef PATH_MAX
+  char _buf[PATH_MAX];
+#else
+  char _buf[512];
+#endif
+  char *buf = _buf;
+
+  if (pts_name (fd, &buf, sizeof (_buf)))
+    return -1;
+  
+  if (statfs (buf, &fsbuf) < 0)
+    return -1;
+
+  /* If the slave pseudo terminal lives on a `devpts' filesystem, the
+     ownership and access permission are already set.  */
+  if (fsbuf.f_type == DEVPTS_SUPER_MAGIC || fsbuf.f_type == DEVFS_SUPER_MAGIC)
+    return 0;
+
+  return __unix_grantpt (fd);
+}
+
+#define grantpt __unix_grantpt
+#include <unix_grantpt.c>
-- 
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