sysdeps/standalone/open.c

   1 /* Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
   2    Ported to standalone by Joel Sherrill jsherril@redstone-emh2.army.mil,
   3      On-Line Applications Research Corporation.
   4
   5 This file is part of the GNU C Library.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public License as
   9 published by the Free Software Foundation; either version 2 of the
  10 License, or (at your option) any later version.
  11
  12 The GNU C Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with the GNU C Library; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, USA.  */
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <stdarg.h>
  25 #include <stddef.h>
  26
  27 #include <stdio.h>
  28 #include <stdio_lim.h>
  29 #include <unistd.h>
  30
  31 #define __DECLARE_FILE_DESCRIPTORS__
  32
  33 #include "filedesc.h"
  34
  35 /* Open FILE with access OFLAG.  If OFLAG includes O_CREAT,
  36    a third argument is the file protection.  */
  37 int
  38 __open (file, oflag)
  39      const char *file;
  40      int oflag;
  41 {
  42   int mode;
  43   int newfd;
  44   int index;
  45
  46   if (file == NULL)
  47     {
  48       __set_errno (EINVAL);
  49       return -1;
  50     }
  51
  52   if (oflag & O_CREAT)
  53     {
  54       va_list arg;
  55       va_start(arg, oflag);
  56       mode = va_arg(arg, int);
  57       va_end(arg);
  58     }
  59
  60   /*
  61    *  Find an open slot.
  62    */
  63
  64   newfd = -1;
  65
  66   for ( index=0 ; index< FOPEN_MAX ; index++ )
  67     if ( !__FD_Table[ index ].in_use ) {
  68       newfd = index;
  69       break;
  70     }
  71
  72   if ( newfd == -1 ) {
  73     __set_errno (ENFILE);
  74     return -1;
  75   }
  76
  77   /*
  78    *  Initialize the open slot
  79    */
  80
  81   __FD_Table[ newfd ].in_use = 1;
  82   __FD_Table[ newfd ].flags = oflag;
  83
  84   return newfd;
  85 }
  86
  87 /* Initialization Code for Console I/O */
  88
  89 #ifdef HAVE_GNU_LD
  90 static
  91 #endif
  92 void
  93 __NONE_init_console_io (argc, argv, envp)
  94      int argc;
  95      char **argv;
  96      char **envp;
  97 {
  98   int index;
  99
 100   for ( index=0 ; index< FOPEN_MAX ; index++ )
 101     __FD_Table[ index ].in_use = 0;
 102
 103   stdin = fopen( "", "r" );
 104
 105   stdout = fopen( "", "w" );
 106
 107   stderr = fopen( "", "w" );
 108
 109   /*
 110    *  Line buffer the standard input and output and use no buffering for
 111    *  standard error.
 112    */
 113
 114   setvbuf( stdin,  NULL, _IOLBF, BUFSIZ );
 115   setvbuf( stdout, NULL, _IOLBF, BUFSIZ );
 116   setvbuf( stderr, NULL, _IONBF, BUFSIZ );
 117
 118   (void) &__NONE_init_console_io;  /* Avoid "defined but not used" warning. */
 119 }
 120
 121 #ifdef  HAVE_GNU_LD
 122 text_set_element (__libc_subinit, __NONE_init_console_io);
 123 #endif
 124
 125 weak_alias (__open, open)