stdio/fdopen-fbsd.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #ifdef VARIANT_DARWINEXTSN
  38 #define _DARWIN_UNLIMITED_STREAMS
  39 #define COUNT   0
  40 #elif defined(VARIANT_LEGACY)
  41 #define COUNT   0
  42 #else
  43 #define COUNT   1
  44 #endif
  45
  46 #if defined(LIBC_SCCS) && !defined(lint)
  47 static char sccsid[] = "@(#)fdopen.c    8.1 (Berkeley) 6/4/93";
  48 #endif /* LIBC_SCCS and not lint */
  49 #include <sys/cdefs.h>
  50 __FBSDID("$FreeBSD: src/lib/libc/stdio/fdopen.c,v 1.7 2002/03/22 21:53:04 obrien Exp $");
  51
  52 #include "namespace.h"
  53 #include <sys/types.h>
  54 #include <fcntl.h>
  55 #include <unistd.h>
  56 #include <stdio.h>
  57 #include <errno.h>
  58 #include "un-namespace.h"
  59 #include "local.h"
  60
  61 FILE *
  62 fdopen(fd, mode)
  63         int fd;
  64         const char *mode;
  65 {
  66         FILE *fp;
  67         static int nofile;
  68         int flags, oflags, fdflags, tmp;
  69
  70         if (nofile == 0)
  71                 nofile = getdtablesize();
  72
  73         if ((flags = __sflags(mode, &oflags)) == 0)
  74                 return (NULL);
  75
  76         /* Make sure the mode the user wants is a subset of the actual mode. */
  77         if ((fdflags = _fcntl(fd, F_GETFL, 0)) < 0)
  78                 return (NULL);
  79         tmp = fdflags & O_ACCMODE;
  80         if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
  81                 errno = EINVAL;
  82                 return (NULL);
  83         }
  84
  85         if ((fp = __sfp(COUNT)) == NULL)
  86                 return (NULL);
  87         fp->_flags = flags;
  88         /*
  89          * If opened for appending, but underlying descriptor does not have
  90          * O_APPEND bit set, assert __SAPP so that __swrite() caller
  91          * will _sseek() to the end before write.
  92          */
  93         if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
  94                 fp->_flags |= __SAPP;
  95         fp->_file = fd;
  96         fp->_cookie = fp;
  97         fp->_read = __sread;
  98         fp->_write = __swrite;
  99         fp->_seek = __sseek;
 100         fp->_close = __sclose;
 101         return (fp);
 102 }