initial import

sysdeps/posix/fdopen.c

@@ -0,0 +1,72 @@
+/* Copyright (C) 1991, 1992, 1993 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+/* Defined in fopen.c.  */
+extern int EXFUN(__getmode, (CONST char *mode, __io_mode *mptr));
+
+/* Open a new stream on a given system file descriptor.  */
+FILE *
+DEFUN(fdopen, (fd, mode), int fd AND CONST char *mode)
+{
+  register FILE *stream;
+  __io_mode m;
+  int dflags;
+
+  if (!__getmode (mode, &m))
+    return NULL;
+
+  /* Verify the FD is valid and allows the access MODE specifies.  */
+
+  dflags = __fcntl (fd, F_GETFL);
+  if (dflags == -1)
+    /* FD was invalid; fcntl has already set errno.  */
+    return NULL;
+
+  /* Check the access mode.  */
+  switch (dflags & O_ACCMODE)
+    {
+    case O_RDONLY:
+      if (!m.__read)
+	{
+	  errno = EBADF;
+	  return NULL;
+	}
+      break;
+    case O_WRONLY:
+      if (!m.__write)
+	{
+	  errno = EBADF;
+	  return NULL;
+	}
+      break;
+    }
+
+  stream = __newstream ();
+  if (stream == NULL)
+    return NULL;
+
+  stream->__cookie = (PTR) fd;
+  stream->__mode = m;
+
+  return stream;
+}