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
|
/* fhandler_signalfd.cc: fhandler for signalfd
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 "path.h"
#include "fhandler.h"
#include "pinfo.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#include <cygwin/signal.h>
#include <sys/signalfd.h>
fhandler_signalfd::fhandler_signalfd () :
fhandler_base (),
sigset (0)
{
}
char *
fhandler_signalfd::get_proc_fd_name (char *buf)
{
return strcpy (buf, "anon_inode:[signalfd]");
}
int
fhandler_signalfd::signalfd (const sigset_t *mask, int flags)
{
__try
{
sigset = *mask & ~(SIGKILL | SIGSTOP);
}
__except (EINVAL)
{
return -1;
}
__endtry
if (flags & SFD_NONBLOCK)
set_nonblocking (true);
if (flags & SFD_CLOEXEC)
set_close_on_exec (true);
if (get_unique_id () == 0)
{
nohandle (true);
set_unique_id ();
set_ino (get_unique_id ());
set_flags (O_RDWR | O_BINARY);
}
return 0;
}
int
fhandler_signalfd::fstat (struct stat *buf)
{
int ret = fhandler_base::fstat (buf);
if (!ret)
{
buf->st_mode = S_IRUSR | S_IWUSR;
buf->st_dev = FH_SIGNALFD;
buf->st_ino = get_unique_id ();
}
return ret;
}
static inline void
copy_siginfo_to_signalfd (struct signalfd_siginfo *sfd,
const siginfo_t * const si)
{
sfd->ssi_signo = si->si_signo;
sfd->ssi_errno = si->si_errno;
sfd->ssi_code = si->si_code;
sfd->ssi_pid = si->si_pid;
sfd->ssi_uid = si->si_uid;
sfd->ssi_fd = -1;
sfd->ssi_tid = si->si_tid;
sfd->ssi_band = 0;
sfd->ssi_overrun = si->si_overrun;
sfd->ssi_trapno = 0;
sfd->ssi_status = si->si_status;
sfd->ssi_int = si->si_value.sival_int;
sfd->ssi_ptr = (uint64_t) si->si_value.sival_ptr;
sfd->ssi_utime = si->si_utime;
sfd->ssi_stime = si->si_stime;
sfd->ssi_addr = (uint64_t) si->si_addr;
}
void
fhandler_signalfd::read (void *ptr, size_t& len)
{
const LARGE_INTEGER poll = { QuadPart : 0 };
siginfo_t si;
int ret, old_errno;
size_t curlen = 0;
signalfd_siginfo *sfd_ptr = (signalfd_siginfo *) ptr;
if (len < sizeof (struct signalfd_siginfo))
{
set_errno (EINVAL);
len = (size_t) -1;
return;
}
old_errno = get_errno ();
do
{
/* Even when read is blocking, only one pending signal is actually
required to return. Subsequently use sigtimedwait to just poll
if some more signal is available. */
ret = sigwait_common (&sigset, &si, (is_nonblocking () || curlen)
? (PLARGE_INTEGER) &poll : NULL);
if (ret == -1)
{
/* If we already read a signal so the buffer isn't empty, just
return success. */
if (curlen > 0)
break;
len = -1;
return;
}
__try
{
copy_siginfo_to_signalfd (sfd_ptr, &si);
}
__except (EFAULT)
{
len = (size_t) -1;
return;
}
__endtry
sfd_ptr++;
curlen += sizeof (*sfd_ptr);
}
while ((len - curlen >= sizeof (struct signalfd_siginfo)));
set_errno (old_errno);
len = curlen;
return;
}
ssize_t
fhandler_signalfd::write (const void *, size_t)
{
set_errno (EINVAL);
return -1;
}
/* Called from select */
int
fhandler_signalfd::poll ()
{
sigset_t outset = sig_send (myself, __SIGPENDING, &_my_tls);
if (outset == SIG_BAD_MASK)
return -1;
if ((outset & sigset) != 0)
return 0;
return -1;
}
|
