summary refs log tree commit diff
path: root/sysdeps/mach/hurd/sysd-stdio.c
blob: 14a2aee2328346b694fd00d9941154cb06209939 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/* Copyright (C) 1994,95,96,97,98,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <hurd.h>
#include <fcntl.h>
#include <hurd/fd.h>

extern __io_read_fn __stdio_read;
extern __io_write_fn __stdio_write;
extern __io_seek_fn __stdio_seek;
extern __io_close_fn __stdio_close;
extern __io_fileno_fn __stdio_fileno;


/* Check ERR for wanting to generate a signal.  */

static inline int
fd_fail (struct hurd_fd *fd, error_t err)
{
  int signo = _hurd_fd_error_signal (err);
  if (signo)
    {
      const struct hurd_signal_detail detail
	= { code: __stdio_fileno (fd), error: err, exc: 0 };
      _hurd_raise_signal (NULL, signo, &detail);
    }
  errno = err;
  return -1;
}


/* Read up to N chars into BUF from COOKIE.
   Return how many chars were read, 0 for EOF or -1 for error.  */
ssize_t
__stdio_read (cookie, buf, n)
     void *cookie;
     char *buf;
     size_t n;
{
  error_t err;
  struct hurd_fd *fd = cookie;

  if (! fd)
    return __hurd_fail (EBADF);

  if (err = _hurd_fd_read (fd, buf, &n, -1))
    return fd_fail (fd, err);

  return n;
}

/* Write up to N chars from BUF to COOKIE.
   Return how many chars were written or -1 for error.  */
ssize_t
__stdio_write (cookie, buf, n)
     void *cookie;
     const char *buf;
     size_t n;
{
  error_t err;
  size_t wrote, nleft;
  struct hurd_fd *fd = cookie;

  if (! fd)
    return __hurd_fail (EBADF);

  nleft = n;
  do
    {
      wrote = nleft;
      if (err = _hurd_fd_write (fd, buf, &wrote, -1))
	return fd_fail (fd, err);
      buf += wrote;
      nleft -= wrote;
    } while (nleft > 0);

  return wrote;
}

/* Move COOKIE's file position *POS bytes, according to WHENCE.
   The current file position is stored in *POS.
   Returns zero if successful, nonzero if not.  */
int
__stdio_seek (cookie, pos, whence)
     void *cookie;
     fpos_t *pos;
     int whence;
{
  error_t err;
  struct hurd_fd *fd = cookie;
  if (! fd)
    return __hurd_fail (EBADF);
  err = HURD_FD_PORT_USE (fd, __io_seek (port, *pos, whence, pos));
  return err ? fd_fail (fd, err) : 0;
}

/* Close the file associated with COOKIE.
   Return 0 for success or -1 for failure.  */
int
__stdio_close (cookie)
     void *cookie;
{
  error_t error = cookie ? _hurd_fd_close (cookie) : EBADF;
  return error ? fd_fail (cookie, error) : 0;
}


static inline int
modeflags (__io_mode m)
{
  int flags = 0;
  if (m.__read)
    flags |= O_READ;
  if (m.__write)
    flags |= O_WRITE;
  if (m.__append)
    flags |= O_APPEND;
  if (m.__create)
    flags |= O_CREAT;
  if (m.__truncate)
    flags |= O_TRUNC;
  if (m.__exclusive)
    flags |= O_EXCL;
  return flags;
}

/* Open FILENAME with the mode in M.  */
int
__stdio_open (filename, m, cookieptr)
     const char *filename;
     __io_mode m;
     void **cookieptr;
{
  int flags;
  file_t port;
  struct hurd_fd *d;

  flags = modeflags (m);
  port = __file_name_lookup (filename, flags, 0666 & ~_hurd_umask);
  if (port == MACH_PORT_NULL)
    return -1;

  HURD_CRITICAL_BEGIN;
  d = _hurd_alloc_fd (NULL, 0);
  if (d != NULL)
    {
      _hurd_port2fd (d, port, flags);
      __spin_unlock (&d->port.lock);
    }
  HURD_CRITICAL_END;

  *cookieptr = d;
  return 0;
}


/* Open FILENAME with the mode in M.  Use the same magic cookie
   already in *COOKIEPTR if possible, closing the old cookie with CLOSEFN.  */
int
__stdio_reopen (const char *filename,
		__io_mode m,
		void **cookieptr,
		__io_close_fn closefn)
{
  int flags;
  file_t port;
  struct hurd_fd *d;

  if (closefn != __stdio_close)
    {
      /* The old cookie is Not Of The Body.
	 Just close it and do a normal open.  */
      (*closefn) (*cookieptr);
      return __stdio_open (filename, m, cookieptr);
    }

  /* Open a new port on the file.  */
  flags = modeflags (m);
  port = __file_name_lookup (filename, flags, 0666 & ~_hurd_umask);

  /* Install the new port in the same file descriptor slot the old cookie
     points to.  If opening the file failed, PORT will be MACH_PORT_NULL
     and installing it in the descriptor will have the effect of closing
     the old descriptor.  */

  d = *cookieptr;
  HURD_CRITICAL_BEGIN;
  __spin_lock (&d->port.lock);
  _hurd_port2fd (d, port, flags);
  __spin_unlock (&d->port.lock);
  HURD_CRITICAL_END;

  return port == MACH_PORT_NULL ? -1 : 0;
}


/* Write a message to the error output.
   Try hard to make it really get out.  */
void
__stdio_errmsg (msg, len)
     const char *msg;
     size_t len;
{
  io_t server;
  mach_msg_type_number_t wrote;

  server = __getdport (2);
  __io_write (server, msg, len, -1, &wrote);
  __mach_port_deallocate (__mach_task_self (), server);
}


/* Return the POSIX.1 file descriptor associated with COOKIE,
   or -1 for errors.  If COOKIE does not relate to any POSIX.1 file
   descriptor, this should return -1 with errno set to EOPNOTSUPP.  */
int
__stdio_fileno (cookie)
     void *cookie;
{
  int fd;

  if (! cookie)
    return __hurd_fail (EBADF);

  __mutex_lock (&_hurd_dtable_lock);
  for (fd = 0; fd < _hurd_dtablesize; ++fd)
    if (_hurd_dtable[fd] == cookie)
      {
	__mutex_unlock (&_hurd_dtable_lock);
	return fd;
      }
  __mutex_unlock (&_hurd_dtable_lock);

  /* This should never happen, because this function should not be
     installed as a stream's __fileno function unless that stream's cookie
     points to a file descriptor.  */
  errno = EGRATUITOUS;
  return -1;
}