sysdeps/standalone/open.c

   1 /* Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    Ported to standalone by Joel Sherrill jsherril@redstone-emh2.army.mil,
   3      On-Line Applications Research Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <stdarg.h>
  24 #include <stddef.h>
  25
  26 #include <stdio.h>
  27 #include <bits/stdio_lim.h>
  28 #include <unistd.h>
  29
  30 #define __DECLARE_FILE_DESCRIPTORS__
  31
  32 #include "filedesc.h"
  33
  34 /* Open FILE with access OFLAG.  If OFLAG includes O_CREAT,
  35    a third argument is the file protection.  */
  36 int
  37 __open (file, oflag)
  38      const char *file;
  39      int oflag;
  40 {
  41   int mode;
  42   int newfd;
  43   int index;
  44
  45   if (file == NULL)
  46     {
  47       __set_errno (EINVAL);
  48       return -1;
  49     }
  50
  51   if (oflag & O_CREAT)
  52     {
  53       va_list arg;
  54       va_start(arg, oflag);
  55       mode = va_arg(arg, int);
  56       va_end(arg);
  57     }
  58
  59   /*
  60    *  Find an open slot.
  61    */
  62
  63   newfd = -1;
  64
  65   for ( index=0 ; index< FOPEN_MAX ; index++ )
  66     if ( !__FD_Table[ index ].in_use ) {
  67       newfd = index;
  68       break;
  69     }
  70
  71   if ( newfd == -1 ) {
  72     __set_errno (ENFILE);
  73     return -1;
  74   }
  75
  76   /*
  77    *  Initialize the open slot
  78    */
  79
  80   __FD_Table[ newfd ].in_use = 1;
  81   __FD_Table[ newfd ].flags = oflag;
  82
  83   return newfd;
  84 }
  85
  86 /* Initialization Code for Console I/O */
  87
  88 #ifdef HAVE_GNU_LD
  89 static
  90 #endif
  91 void
  92 __NONE_init_console_io (argc, argv, envp)
  93      int argc;
  94      char **argv;
  95      char **envp;
  96 {
  97   int index;
  98
  99   for ( index=0 ; index< FOPEN_MAX ; index++ )
 100     __FD_Table[ index ].in_use = 0;
 101
 102   stdin = fopen( "", "r" );
 103
 104   stdout = fopen( "", "w" );
 105
 106   stderr = fopen( "", "w" );
 107
 108   /*
 109    *  Line buffer the standard input and output and use no buffering for
 110    *  standard error.
 111    */
 112
 113   setvbuf( stdin,  NULL, _IOLBF, BUFSIZ );
 114   setvbuf( stdout, NULL, _IOLBF, BUFSIZ );
 115   setvbuf( stderr, NULL, _IONBF, BUFSIZ );
 116
 117   (void) &__NONE_init_console_io;  /* Avoid "defined but not used" warning. */
 118 }
 119
 120 #ifdef  HAVE_GNU_LD
 121 text_set_element (__libc_subinit, __NONE_init_console_io);
 122 #endif
 123
 124 weak_alias (__open, open)