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
|
/* fhandler_fifo.cc. See fhandler.h for a description of the fhandler classes.
Copyright 2002, 2003 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "pinfo.h"
fhandler_fifo::fhandler_fifo ()
: fhandler_pipe (), output_handle (NULL), owner (NULL), upand (0),
read_use (0), write_use (0)
{
}
void
fhandler_fifo::set_use (int incr)
{
long oread_use = read_use;
if (get_flags () & (O_WRONLY | O_APPEND))
write_use += incr;
else if (get_flags () & O_RDWR)
{
write_use += incr;
read_use += incr;
}
else
read_use += incr;
if (incr >= 0)
return;
char buf[24];
__small_sprintf (buf, "%x.%x", upand, myself->pid);
ATOM ant = GlobalFindAtom (buf);
if (!ant)
return;
if (read_use <= 0 && oread_use != read_use)
{
HANDLE h = get_handle ();
if (h)
{
set_io_handle (NULL);
CloseHandle (h);
}
DeleteAtom (ant);
}
}
int
fhandler_fifo::close ()
{
fhandler_pipe::close ();
CloseHandle (get_output_handle ());
set_use (-1);
return 0;
}
#define DUMMY_O_RDONLY 4
int
fhandler_fifo::open_not_mine (int flags)
{
char buf[24];
winpids pids;
static int flagtypes[] = {DUMMY_O_RDONLY | O_RDWR, O_WRONLY | O_APPEND | O_RDWR};
HANDLE *usehandles[2] = {&(get_handle ()), &(get_output_handle ())};
int res;
for (unsigned i = 0; i < pids.npids; i++)
{
_pinfo *p = pids[i];
__small_sprintf (buf, "%x.%x", upand, p->pid);
if (!GlobalFindAtom (buf))
continue;
HANDLE hp = OpenProcess (PROCESS_DUP_HANDLE, false, p->dwProcessId);
if (!hp)
{
__seterrno ();
goto err;
}
HANDLE handles[2];
commune_result r;
r = p->commune_send (PICOM_FIFO, upand);
flags = (flags & (O_RDWR | O_WRONLY | O_APPEND)) ?: DUMMY_O_RDONLY;
for (int i = 0; i < 2; i++)
{
if (!(flags & flagtypes[i]))
continue;
if (!DuplicateHandle (hp, r.handles[i], hMainProc, usehandles[i], 0,
false, DUPLICATE_SAME_ACCESS))
{
debug_printf ("couldn't duplicate handle %d/%p, %E", i, handles[i]);
__seterrno ();
goto err;
}
if (i == 0)
{
read_state = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
set_need_fork_fixup ();
}
}
CloseHandle (hp);
res = 1;
set_flags (flags);
goto out;
}
set_errno (EAGAIN);
err:
res = 0;
debug_printf ("failed");
out:
debug_printf ("res %d", res);
return res;
}
int
fhandler_fifo::open (int flags, mode_t)
{
int res = 1;
char buf[24];
upand = GlobalAddAtom (pc);
__small_sprintf (buf, "%x.owner", upand);
debug_printf ("mutex %s", buf);
HANDLE h = CreateMutex (&sec_none, false, buf);
if (!h)
goto errnout;
if (GetLastError () == ERROR_ALREADY_EXISTS)
{
CloseHandle (h);
return open_not_mine (flags);
}
fhandler_pipe *fhs[2];
if (create (fhs, 0, flags, true))
{
CloseHandle (h);
goto errout;
}
set_flags (fhs[0]->get_flags ());
set_io_handle (fhs[0]->get_handle ());
set_output_handle (fhs[1]->get_handle ());
guard = fhs[0]->guard;
read_state = fhs[0]->read_state;
writepipe_exists = fhs[1]->writepipe_exists;
orig_pid = fhs[0]->orig_pid;
id = fhs[0]->id;
delete (fhs[0]);
delete (fhs[1]);
set_use (1);
__small_sprintf (buf, "%x.%x", upand, myself->pid);
(void) GlobalAddAtom (buf);
goto out;
errnout:
__seterrno ();
errout:
res = 0;
out:
debug_printf ("returning %d, errno %d", res, get_errno ());
return res;
}
int
fhandler_fifo::dup (fhandler_base * child)
{
int res = fhandler_pipe::dup (child);
if (!res)
{
fhandler_fifo *ff = (fhandler_fifo *) child;
if (!DuplicateHandle (hMainProc, get_output_handle (), hMainProc,
&ff->get_output_handle (), false, true,
DUPLICATE_SAME_ACCESS))
{
child->close ();
res = -1;
}
}
return 0;
}
|