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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
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/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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/* Defined in fopen.c. */
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extern int EXFUN(__getmode, (CONST char *mode, __io_mode *mptr));
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/* Open a new stream on a given system file descriptor. */
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FILE *
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DEFUN(fdopen, (fd, mode), int fd AND CONST char *mode)
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{
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register FILE *stream;
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__io_mode m;
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int dflags;
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if (!__getmode (mode, &m))
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return NULL;
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/* Verify the FD is valid and allows the access MODE specifies. */
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dflags = __fcntl (fd, F_GETFL);
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if (dflags == -1)
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/* FD was invalid; fcntl has already set errno. */
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return NULL;
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/* Check the access mode. */
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switch (dflags & O_ACCMODE)
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{
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case O_RDONLY:
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if (!m.__read)
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{
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errno = EBADF;
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return NULL;
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}
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break;
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case O_WRONLY:
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if (!m.__write)
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{
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errno = EBADF;
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return NULL;
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}
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break;
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}
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stream = __newstream ();
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if (stream == NULL)
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return NULL;
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stream->__cookie = (PTR) fd;
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stream->__mode = m;
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return stream;
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}
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