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
open(const char * pathname,int flags,...)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 }
80