L4Re - L4 Runtime Environment
vcon_stream_impl.h
1 /*
2  * (c) 2010 Alexander Warg <warg@os.inf.tu-dresden.de>
3  * economic rights: Technische Universit├Ąt Dresden (Germany)
4  *
5  * This file is part of TUD:OS and distributed under the terms of the
6  * GNU General Public License 2.
7  * Please see the COPYING-GPL-2 file for details.
8  *
9  * As a special exception, you may use this file as part of a free software
10  * library without restriction. Specifically, if other files instantiate
11  * templates or use macros or inline functions from this file, or you compile
12  * this file and link it with other files to produce an executable, this
13  * file does not by itself cause the resulting executable to be covered by
14  * the GNU General Public License. This exception does not however
15  * invalidate any other reasons why the executable file might be covered by
16  * the GNU General Public License.
17  */
18 
19 #include <l4/re/env>
20 #include <l4/sys/factory>
21 
22 #include "vcon_stream.h"
23 
24 #include <termios.h>
25 #include <unistd.h>
26 #include <sys/ioctl.h>
27 #include <sys/ttydefaults.h>
28 
29 namespace L4Re { namespace Core {
30 Vcon_stream::Vcon_stream(L4::Cap<L4::Vcon> s) throw()
31 : Be_file_stream(), _s(s), _irq(L4Re::virt_cap_alloc->alloc<L4::Semaphore>())
32 {
33  //printf("VCON: irq cap = %lx\n", _irq.cap());
34  int res = l4_error(L4Re::Env::env()->factory()->create(_irq));
35  //printf("VCON: irq create res=%d\n", res);
36 
37  if (res < 0)
38  return; // handle errors!!!
39 
40  res = l4_error(_s->bind(0, _irq));
41  //printf("VCON: bound irq to con res=%d\n", res);
42 }
43 
44 ssize_t
45 Vcon_stream::readv(const struct iovec *iovec, int iovcnt) throw()
46 {
47  ssize_t bytes = 0;
48  for (; iovcnt > 0; --iovcnt, ++iovec)
49  {
50  if (iovec->iov_len == 0)
51  continue;
52 
53  char *buf = (char *)iovec->iov_base;
54  size_t len = iovec->iov_len;
55 
56  while (1)
57  {
58  int ret = _s->read(buf, len);
59 
60  // BS: what is this ??
61  if (ret > (int)len)
62  ret = len;
63 
64  if (ret < 0)
65  return ret;
66  else if (ret == 0)
67  {
68  if (bytes)
69  return bytes;
70 
71  ret = _s->read(buf, len);
72  if (ret < 0)
73  return ret;
74  else if (ret == 0)
75  {
76  _irq->down();
77  continue;
78  }
79  }
80 
81  bytes += ret;
82  len -= ret;
83  buf += ret;
84 
85  if (len == 0)
86  break;
87  }
88  }
89 
90  return bytes;
91 }
92 
93 ssize_t
94 Vcon_stream::writev(const struct iovec *iovec, int iovcnt) throw()
95 {
96  l4_msg_regs_t store;
97  l4_msg_regs_t *mr = l4_utcb_mr();
98 
99  Vfs_config::memcpy(&store, mr, sizeof(store));
100 
101  ssize_t written = 0;
102  while (iovcnt)
103  {
104  size_t sl = iovec->iov_len;
105  char const *b = (char const *)iovec->iov_base;
106 
107  for (; sl > L4_VCON_WRITE_SIZE
109  _s->send(b, L4_VCON_WRITE_SIZE);
110 
111  _s->send(b, sl);
112 
113  written += iovec->iov_len;
114 
115  ++iovec;
116  --iovcnt;
117  }
118  Vfs_config::memcpy(mr, &store, sizeof(store));
119  return written;
120 }
121 
122 int
123 Vcon_stream::fstat64(struct stat64 *buf) const throw()
124 {
125  buf->st_size = 0;
126  buf->st_mode = 0666;
127  buf->st_dev = _s.cap();
128  buf->st_ino = 0;
129  return 0;
130 }
131 
132 int
133 Vcon_stream::ioctl(unsigned long request, va_list args) throw()
134 {
135  switch (request) {
136  case TCGETS:
137  {
138  //vt100_tcgetattr(term, (struct termios *)argp);
139 
140  struct termios *t = va_arg(args, struct termios *);
141 
142  l4_vcon_attr_t l4a;
143  if (!l4_error(_s->get_attr(&l4a)))
144  {
145  t->c_iflag = l4a.i_flags;
146  t->c_oflag = l4a.o_flags; // output flags
147  t->c_cflag = 0; // control flags
148  t->c_lflag = l4a.l_flags; // local flags
149  }
150  else
151  t->c_iflag = t->c_oflag = t->c_cflag = t->c_lflag = 0;
152 #if 0
153  //t->c_lflag |= ECHO; // if term->echo
154  t->c_lflag |= ICANON; // if term->term_mode == VT100MODE_COOKED
155 #endif
156 
157  t->c_cc[VEOF] = CEOF;
158  t->c_cc[VEOL] = _POSIX_VDISABLE;
159  t->c_cc[VEOL2] = _POSIX_VDISABLE;
160  t->c_cc[VERASE] = CERASE;
161  t->c_cc[VWERASE]= CWERASE;
162  t->c_cc[VKILL] = CKILL;
163  t->c_cc[VREPRINT]=CREPRINT;
164  t->c_cc[VINTR] = CINTR;
165  t->c_cc[VQUIT] = _POSIX_VDISABLE;
166  t->c_cc[VSUSP] = CSUSP;
167  t->c_cc[VSTART] = CSTART;
168  t->c_cc[VSTOP] = CSTOP;
169  t->c_cc[VLNEXT] = CLNEXT;
170  t->c_cc[VDISCARD]=CDISCARD;
171  t->c_cc[VMIN] = CMIN;
172  t->c_cc[VTIME] = 0;
173 
174  }
175 
176  return 0;
177 
178  case TCSETS:
179  case TCSETSW:
180  case TCSETSF:
181  {
182  //vt100_tcsetattr(term, (struct termios *)argp);
183  struct termios const *t = va_arg(args, struct termios const *);
184 
185  // XXX: well, we're cheating, get this from the other side!
186 
187  l4_vcon_attr_t l4a;
188  l4a.i_flags = t->c_iflag;
189  l4a.o_flags = t->c_oflag; // output flags
190  l4a.l_flags = t->c_lflag; // local flags
191  _s->set_attr(&l4a);
192  }
193  return 0;
194 
195  default:
196  break;
197  };
198  return -EINVAL;
199 }
200 
201 }}
Encapsulation of the message-register block in the UTCB.
Definition: utcb.h:78
Vcon attribute structure.
Definition: vcon.h:178
l4_umword_t o_flags
output flags
Definition: vcon.h:181
L4Re C++ Interfaces.
Definition: cmd_control:15
Environment interface.
l4_msg_regs_t * l4_utcb_mr(void) L4_NOTHROW L4_PURE
Get the message-register block of a UTCB.
Definition: utcb.h:352
Maximum size that can be written with one l4_vcon_write call.
Definition: vcon.h:98
static Env const * env()
Returns the initial environment for the current task.
Definition: env:103
l4_umword_t l_flags
local flags
Definition: vcon.h:182
long l4_error(l4_msgtag_t tag) L4_NOTHROW
Return error code of a system call return message tag.
Definition: ipc.h:517
Common factory related definitions.
l4_umword_t i_flags
input flags
Definition: vcon.h:180