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
|
/*
* Copyright (c) 2016 Proofpoint, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#include <sm/gen.h>
#include <sm/conf.h> /* FDSET_CAST */
#include <sm/fdset.h>
#include <sm/assert.h>
#include <sm/notify.h>
#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h> /* for memset() */
#if SM_NOTIFY_DEBUG
#define SM_DBG(p) fprintf p
#else
#define SM_DBG(p)
#endif
static int Notifypipe[2];
#define NotifyRDpipe Notifypipe[0]
#define NotifyWRpipe Notifypipe[1]
#define CLOSEFD(fd) do { \
if ((fd) != -1) { \
(void) close(fd); \
fd = - 1; \
} \
} while (0) \
/*
** SM_NOTIFY_INIT -- initialize notify system
**
** Parameters:
** flags -- ignored
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_init(flags)
int flags;
{
if (pipe(Notifypipe) < 0)
return -errno;
return 0;
}
/*
** SM_NOTIFY_START -- start notify system
**
** Parameters:
** owner -- owner.
** flags -- currently ignored.
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_start(owner, flags)
bool owner;
int flags;
{
int r;
r = 0;
if (owner)
CLOSEFD(NotifyWRpipe);
else
CLOSEFD(NotifyRDpipe);
return r;
}
/*
** SM_NOTIFY_STOP -- stop notify system
**
** Parameters:
** owner -- owner.
** flags -- currently ignored.
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_stop(owner, flags)
bool owner;
int flags;
{
if (owner)
CLOSEFD(NotifyRDpipe);
else
CLOSEFD(NotifyWRpipe);
return 0;
}
/*
** SM_NOTIFY_SND -- send notification
**
** Parameters:
** buf -- where to write data
** buflen -- len of buffer
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_snd(buf, buflen)
char *buf;
size_t buflen;
{
int r;
int save_errno;
SM_REQUIRE(buf != NULL);
SM_REQUIRE(buflen > 0);
if (NotifyWRpipe < 0)
return -EINVAL;
r = write(NotifyWRpipe, buf, buflen);
save_errno = errno;
SM_DBG((stderr, "write=%d, fd=%d, e=%d\n", r, NotifyWRpipe, save_errno));
return r >= 0 ? 0 : -save_errno;
}
/*
** SM_NOTIFY_RCV -- receive notification
**
** Parameters:
** buf -- where to write data
** buflen -- len of buffer
** tmo -- timeout
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_rcv(buf, buflen, tmo)
char *buf;
size_t buflen;
int tmo;
{
int r;
int save_errno;
fd_set readfds;
struct timeval timeout;
SM_REQUIRE(buf != NULL);
SM_REQUIRE(buflen > 0);
if (NotifyRDpipe < 0)
return -EINVAL;
FD_ZERO(&readfds);
SM_FD_SET(NotifyRDpipe, &readfds);
timeout.tv_sec = tmo;
timeout.tv_usec = 0;
do {
r = select(NotifyRDpipe + 1, FDSET_CAST &readfds, NULL, NULL, &timeout);
save_errno = errno;
SM_DBG((stderr, "select=%d, fd=%d, e=%d\n", r, NotifyRDpipe, save_errno));
} while (r < 0 && save_errno == EINTR);
if (r <= 0)
{
SM_DBG((stderr, "select=%d, e=%d\n", r, save_errno));
return -ETIMEDOUT;
}
/* bogus... need to check again? */
if (!FD_ISSET(NotifyRDpipe, &readfds))
return -ETIMEDOUT;
r = read(NotifyRDpipe, buf, buflen);
save_errno = errno;
SM_DBG((stderr, "read=%d, e=%d\n", r, save_errno));
if (r == 0)
return -1; /* ??? */
if (r < 0)
return -save_errno;
return r;
}
|
