StdLib/LibC/Stdio/fdopen.c

   1 /** @file
   2
   3   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   4   This program and the accompanying materials are licensed and made available under
   5   the terms and conditions of the BSD License that accompanies this distribution.
   6   The full text of the license may be found at
   7   http://opensource.org/licenses/bsd-license.
   8
   9   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12  * Copyright (c) 1990, 1993
  13  *  The Regents of the University of California.  All rights reserved.
  14  *
  15  * This code is derived from software contributed to Berkeley by
  16  * Chris Torek.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  * 3. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41
  42     NetBSD: fdopen.c,v 1.14 2003/08/07 16:43:22 agc Exp
  43     fdopen.c  8.1 (Berkeley) 6/4/93
  44 **/
  45 #include  <LibConfig.h>
  46 #include  <sys/EfiCdefs.h>
  47
  48 #include  "namespace.h"
  49 #include  <sys/types.h>
  50
  51 #include  <assert.h>
  52 #include  <errno.h>
  53 #include  <fcntl.h>
  54 #include  <stdio.h>
  55 #include  <unistd.h>
  56
  57 #include  "reentrant.h"
  58 #include  "local.h"
  59
  60 #ifdef __weak_alias
  61 __weak_alias(fdopen,_fdopen)
  62 #endif
  63
  64 FILE *
  65 fdopen(int fd, const char *mode)
  66 {
  67   FILE *fp;
  68   int flags, oflags, fdflags, tmp;
  69
  70   _DIAGASSERT(fd != -1);
  71
  72   if ((flags = __sflags(mode, &oflags)) == 0)
  73     return (NULL);
  74
  75   /* Make sure the mode the user wants is a subset of the actual mode. */
  76   if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
  77     return (NULL);
  78   tmp = fdflags & O_ACCMODE;
  79   if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
  80     errno = EINVAL;
  81     return (NULL);
  82   }
  83
  84   if (oflags & O_NONBLOCK) {
  85     struct stat st;
  86     if (fstat(fd, &st) == -1) {
  87       return (NULL);
  88     }
  89     if (!S_ISREG(st.st_mode)) {
  90       errno = EFTYPE;
  91       return (NULL);
  92     }
  93   }
  94
  95   if ((fp = __sfp()) == NULL)
  96     return (NULL);
  97   fp->_flags = (unsigned short)flags;
  98   /*
  99    * If opened for appending, but underlying descriptor does not have
 100    * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
 101    * end before each write.
 102    */
 103   if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
 104     fp->_flags |= __SAPP;
 105   fp->_file = (short)fd;
 106   fp->_cookie = fp;
 107   fp->_read = __sread;
 108   fp->_write = __swrite;
 109   fp->_seek = __sseek;
 110   fp->_close = __sclose;
 111   return (fp);
 112 }