1 /*
2 * (c) 2010 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
3 * Alexander Warg <warg@os.inf.tu-dresden.de>
4 * economic rights: Technische Universität Dresden (Germany)
5 *
6 * This file is part of TUD:OS and distributed under the terms of the
7 * GNU General Public License 2.
8 * Please see the COPYING-GPL-2 file for details.
9 *
10 * As a special exception, you may use this file as part of a free software
11 * library without restriction. Specifically, if other files instantiate
12 * templates or use macros or inline functions from this file, or you compile
13 * this file and link it with other files to produce an executable, this
14 * file does not by itself cause the resulting executable to be covered by
15 * the GNU General Public License. This exception does not however
16 * invalidate any other reasons why the executable file might be covered by
17 * the GNU General Public License.
18 */
19
20 #include "ro_file.h"
21
22 #include <sys/ioctl.h>
23
24 #include <l4/re/env>
25
26 namespace L4Re { namespace Core {
27
~Ro_file()28 Ro_file::~Ro_file() throw()
29 {
30 if (_addr)
31 L4Re::Env::env()->rm()->detach(l4_addr_t(_addr), 0);
32
33 L4Re::virt_cap_alloc->release(_ds);
34 }
35
36 int
fstat64(struct stat64 * buf)37 Ro_file::fstat64(struct stat64 *buf) const throw()
38 {
39 static int fake = 0;
40
41 memset(buf, 0, sizeof(*buf));
42 buf->st_size = _size;
43 buf->st_mode = S_IFREG | 0644;
44 buf->st_dev = _ds.cap();
45 buf->st_ino = ++fake;
46 buf->st_blksize = L4_PAGESIZE;
47 buf->st_blocks = l4_round_page(_size);
48 return 0;
49 }
50
51 ssize_t
read_single(const struct iovec * vec,off64_t pos)52 Ro_file::read_single(const struct iovec *vec, off64_t pos) throw()
53 {
54 off64_t l = vec->iov_len;
55 if (_size - pos < l)
56 l = _size - pos;
57
58 if (l > 0)
59 {
60 Vfs_config::memcpy(vec->iov_base, _addr + pos, l);
61 return l;
62 }
63
64 return 0;
65 }
66
67 ssize_t
preadv(const struct iovec * vec,int cnt,off64_t offset)68 Ro_file::preadv(const struct iovec *vec, int cnt, off64_t offset) throw()
69 {
70 if (!_addr)
71 {
72 void const *file = (void*)L4_PAGESIZE;
73 long err = L4Re::Env::env()->rm()->attach(&file, _size,
74 Rm::F::Search_addr | Rm::F::R,
75 _ds, 0);
76
77 if (err < 0)
78 return err;
79
80 _addr = (char const *)file;
81 }
82
83 ssize_t l = 0;
84
85 while (cnt > 0)
86 {
87 ssize_t r = read_single(vec, offset);
88 offset += r;
89 l += r;
90
91 if ((size_t)r < vec->iov_len)
92 return l;
93
94 ++vec;
95 --cnt;
96 }
97 return l;
98 }
99
100 ssize_t
pwritev(const struct iovec *,int,off64_t)101 Ro_file::pwritev(const struct iovec *, int, off64_t) throw()
102 {
103 return -EROFS;
104 }
105
106 int
ioctl(unsigned long v,va_list args)107 Ro_file::ioctl(unsigned long v, va_list args) throw()
108 {
109 switch (v)
110 {
111 case FIONREAD: // return amount of data still available
112 int *available = va_arg(args, int *);
113 *available = _size - pos();
114 return 0;
115 };
116 return -EINVAL;
117 }
118
119 }}
120