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root/usr/lib/libc/stdio/fdopen.c

DEFINITIONS

1. fdopen

   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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  33 #include <sys/types.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <errno.h>
  38 #include "local.h"
FILE *
fdopen(fd, mode)
  42         int fd;
  43         const char *mode;
  44 {
FILE *fp;
  46         int flags, oflags, fdflags, tmp;
  48         if ((flags = __sflags(mode, &oflags)) == 0)
  49                 return (NULL);
  51         /* Make sure the mode the user wants is a subset of the actual mode. */
  52         if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
  53                 return (NULL);
tmp = fdflags & O_ACCMODE;
  55         if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
errno = EINVAL;
  57                 return (NULL);
  58         }
  60         if ((fp = __sfp()) == NULL)
  61                 return (NULL);
fp->_flags = flags;
  63         /*
  64          * If opened for appending, but underlying descriptor does not have
  65          * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
  66          * end before each write.
  67          */
  68         if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
fp->_flags |= __SAPP;
fp->_file = fd;
  71         return (fp);
  72 }