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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
/* Copyright (C) 1992-2024 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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <stdarg.h>
#include <sys/file.h> /* XXX for LOCK_* */
#ifdef NOCANCEL
#include <not-cancel.h>
#else
#include <sysdep-cancel.h>
#endif
#include "f_setlk.h"
/* Perform file control operations on FD. */
int
__libc_fcntl (int fd, int cmd, ...)
{
va_list ap;
struct hurd_fd *d;
int result;
d = _hurd_fd_get (fd);
if (d == NULL)
return __hurd_fail (EBADF);
va_start (ap, cmd);
switch (cmd)
{
error_t err;
default: /* Bad command. */
result = __hurd_fail (EINVAL);
break;
/* First the descriptor-based commands, which do no RPCs. */
case F_DUPFD: /* Duplicate the file descriptor. */
case F_DUPFD_CLOEXEC:
{
struct hurd_fd *new;
io_t port, ctty;
struct hurd_userlink ulink, ctty_ulink;
int flags;
HURD_CRITICAL_BEGIN;
/* Extract the ports and flags from the file descriptor. */
__spin_lock (&d->port.lock);
flags = d->flags;
ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
port = _hurd_port_locked_get (&d->port, &ulink); /* Unlocks D. */
if (cmd == F_DUPFD_CLOEXEC)
flags |= FD_CLOEXEC;
else
/* Duplication clears the FD_CLOEXEC flag. */
flags &= ~FD_CLOEXEC;
/* Get a new file descriptor. The third argument to __fcntl is the
minimum file descriptor number for it. */
new = _hurd_alloc_fd (&result, va_arg (ap, int));
if (new == NULL)
/* _hurd_alloc_fd has set errno. */
result = -1;
else
{
/* Give the ports each a user ref for the new descriptor. */
__mach_port_mod_refs (__mach_task_self (), port,
MACH_PORT_RIGHT_SEND, 1);
if (ctty != MACH_PORT_NULL)
__mach_port_mod_refs (__mach_task_self (), ctty,
MACH_PORT_RIGHT_SEND, 1);
/* Install the ports and flags in the new descriptor. */
if (ctty != MACH_PORT_NULL)
_hurd_port_set (&new->ctty, ctty);
new->flags = flags;
_hurd_port_locked_set (&new->port, port); /* Unlocks NEW. */
}
HURD_CRITICAL_END;
_hurd_port_free (&d->port, &ulink, port);
if (ctty != MACH_PORT_NULL)
_hurd_port_free (&d->ctty, &ctty_ulink, port);
break;
}
/* Set RESULT by evaluating EXPR with the descriptor locked.
Check for an empty descriptor and return EBADF. */
#define LOCKED(expr) do { \
HURD_CRITICAL_BEGIN; \
__spin_lock (&d->port.lock); \
if (d->port.port == MACH_PORT_NULL) \
result = __hurd_fail (EBADF); \
else \
result = (expr); \
__spin_unlock (&d->port.lock); \
HURD_CRITICAL_END; \
} while(0)
case F_GETFD: /* Get descriptor flags. */
LOCKED (d->flags);
break;
case F_SETFD: /* Set descriptor flags. */
LOCKED ((d->flags = va_arg (ap, int), 0));
break;
/* Now the real io operations, done by RPCs to io servers. */
case F_GETLK:
case F_SETLK:
case F_SETLKW:
{
struct flock *fl = va_arg (ap, struct flock *);
switch (cmd)
{
case F_GETLK:
cmd = F_GETLK64;
break;
case F_SETLK:
cmd = F_SETLK64;
break;
case F_SETLKW:
cmd = F_SETLKW64;
break;
default:
return __hurd_fail (EINVAL);
}
struct flock64 fl64 = {
.l_type = fl->l_type,
.l_whence = fl->l_whence,
.l_start = fl->l_start,
.l_len = fl->l_len,
.l_pid = fl->l_pid
};
#ifndef NOCANCEL
if (cmd == F_SETLKW64)
{
int cancel_oldtype = LIBC_CANCEL_ASYNC();
err = HURD_FD_PORT_USE_CANCEL (d, __file_record_lock (port, cmd,
&fl64, MACH_PORT_NULL,
MACH_MSG_TYPE_MAKE_SEND));
LIBC_CANCEL_RESET (cancel_oldtype);
}
else
#endif
err = HURD_FD_PORT_USE (d, __file_record_lock (port, cmd, &fl64,
MACH_PORT_NULL, MACH_MSG_TYPE_MAKE_SEND));
/* XXX: To remove once file_record_lock RPC is settled. */
if (err == EMIG_BAD_ID || err == EOPNOTSUPP)
{
int wait = 0;
va_end (ap);
switch (cmd)
{
case F_GETLK64:
return __hurd_fail (ENOSYS);
case F_SETLKW64:
wait = 1;
/* FALLTHROUGH */
case F_SETLK64:
return __f_setlk (fd, fl->l_type, fl->l_whence,
fl->l_start, fl->l_len, wait);
default:
return __hurd_fail (EINVAL);
}
}
else if (cmd == F_GETLK64)
{
fl->l_type = fl64.l_type;
fl->l_whence = fl64.l_whence;
fl->l_start = fl64.l_start;
fl->l_len = fl64.l_len;
fl->l_pid = fl64.l_pid;
if ((sizeof fl->l_start != sizeof fl64.l_start
&& fl->l_start != fl64.l_start)
|| (sizeof fl->l_len != sizeof fl64.l_len
&& fl->l_len != fl64.l_len))
return __hurd_fail (EOVERFLOW);
}
result = err ? __hurd_dfail (fd, err) : 0;
break;
}
case F_GETLK64:
case F_SETLK64:
case F_SETLKW64:
{
struct flock64 *fl = va_arg (ap, struct flock64 *);
#ifndef NOCANCEL
if (cmd == F_SETLKW64)
{
int cancel_oldtype = LIBC_CANCEL_ASYNC();
err = HURD_FD_PORT_USE_CANCEL (d, __file_record_lock (port, cmd,
fl, MACH_PORT_NULL,
MACH_MSG_TYPE_MAKE_SEND));
LIBC_CANCEL_RESET (cancel_oldtype);
}
else
#endif
err = HURD_FD_PORT_USE (d, __file_record_lock (port, cmd, fl,
MACH_PORT_NULL, MACH_MSG_TYPE_MAKE_SEND));
/* XXX: To remove once file_record_lock RPC is settled. */
if (err == EMIG_BAD_ID || err == EOPNOTSUPP)
{
int wait = 0;
va_end (ap);
switch (cmd)
{
case F_GETLK64:
return __hurd_fail (ENOSYS);
case F_SETLKW64:
wait = 1;
/* FALLTHROUGH */
case F_SETLK64:
return __f_setlk (fd, fl->l_type, fl->l_whence,
fl->l_start, fl->l_len, wait);
default:
return __hurd_fail (EINVAL);
}
}
result = err ? __hurd_dfail (fd, err) : 0;
break;
}
case F_GETFL: /* Get per-open flags. */
if (err = HURD_FD_PORT_USE (d, __io_get_openmodes (port, &result)))
result = __hurd_dfail (fd, err);
break;
case F_SETFL: /* Set per-open flags. */
err = HURD_FD_PORT_USE (d, __io_set_all_openmodes (port,
va_arg (ap, int)));
result = err ? __hurd_dfail (fd, err) : 0;
break;
case F_GETOWN: /* Get owner. */
if (err = HURD_FD_PORT_USE (d, __io_get_owner (port, &result)))
result = __hurd_dfail (fd, err);
break;
case F_SETOWN: /* Set owner. */
err = HURD_FD_PORT_USE (d, __io_mod_owner (port, va_arg (ap, pid_t)));
result = err ? __hurd_dfail (fd, err) : 0;
break;
}
va_end (ap);
return result;
}
libc_hidden_def (__libc_fcntl)
#ifndef NOCANCEL
weak_alias (__libc_fcntl, __fcntl)
libc_hidden_weak (__fcntl)
weak_alias (__libc_fcntl, fcntl)
strong_alias (__libc_fcntl, __libc_fcntl64)
libc_hidden_def (__libc_fcntl64)
weak_alias (__libc_fcntl64, __fcntl64)
libc_hidden_weak (__fcntl64)
weak_alias (__fcntl64, fcntl64)
#endif
|
