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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/posix/fdopen.c
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initial import
Diffstat (limited to 'sysdeps/posix/fdopen.c')
-rw-r--r--sysdeps/posix/fdopen.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/sysdeps/posix/fdopen.c b/sysdeps/posix/fdopen.c
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+++ b/sysdeps/posix/fdopen.c
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+/* 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;
+}