com32/lib/sys/open.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2003-2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 #include <errno.h>
  29 #include <com32.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <fcntl.h>
  33 #include <fs.h>
  34 #include "file.h"
  35
  36 /*
  37  * open.c
  38  *
  39  * Open an ordinary file
  40  */
  41
  42 extern ssize_t __file_read(struct file_info *, void *, size_t);
  43 extern int __file_close(struct file_info *);
  44
  45 const struct input_dev __file_dev = {
  46     .dev_magic = __DEV_MAGIC,
  47     .flags = __DEV_FILE | __DEV_INPUT,
  48     .fileflags = O_RDONLY,
  49     .read = __file_read,
  50     .close = __file_close,
  51     .open = NULL,
  52 };
  53
  54 int open(const char *pathname, int flags, ...)
  55 {
  56     int fd, handle;
  57     struct file_info *fp;
  58
  59     fd = opendev(&__file_dev, NULL, flags);
  60
  61     //printf("enter, file = %s, fd = %d\n", pathname, fd);
  62
  63     if (fd < 0)
  64         return -1;
  65
  66     fp = &__file_info[fd];
  67
  68     handle = open_file(pathname, flags, &fp->i.fd);
  69     if (handle < 0) {
  70         close(fd);
  71         errno = ENOENT;
  72         return -1;
  73     }
  74
  75     fp->i.offset = 0;
  76     fp->i.nbytes = 0;
  77
  78     return fd;
  79 }