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
|
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Unix domain socket refclock driver.
*/
#include "config.h"
#include "sysincl.h"
#include "refclock.h"
#include "logging.h"
#include "util.h"
#include "sched.h"
#define SOCK_MAGIC 0x534f434b
struct sock_sample {
struct timeval tv;
double offset;
int pulse;
int leap;
int _pad;
int magic;
};
static void read_sample(void *anything)
{
struct sock_sample sample;
RCL_Instance instance;
int sockfd, s;
instance = (RCL_Instance)anything;
sockfd = (long)RCL_GetDriverData(instance);
s = recv(sockfd, &sample, sizeof (sample), 0);
if (s < 0) {
LOG(LOGS_ERR, LOGF_Refclock, "Could not read SOCK sample : %s",
strerror(errno));
return;
}
if (s != sizeof (sample)) {
LOG(LOGS_WARN, LOGF_Refclock, "Unexpected length of SOCK sample : %d != %ld",
s, (long)sizeof (sample));
return;
}
if (sample.magic != SOCK_MAGIC) {
LOG(LOGS_WARN, LOGF_Refclock, "Unexpected magic number in SOCK sample : %x != %x",
sample.magic, SOCK_MAGIC);
return;
}
if (sample.pulse) {
RCL_AddPulse(instance, &sample.tv, sample.offset);
} else {
RCL_AddSample(instance, &sample.tv, sample.offset, sample.leap);
}
}
static int sock_initialise(RCL_Instance instance)
{
struct sockaddr_un s;
int sockfd;
char *path;
path = RCL_GetDriverParameter(instance);
s.sun_family = AF_UNIX;
if (snprintf(s.sun_path, sizeof (s.sun_path), "%s", path) >= sizeof (s.sun_path)) {
LOG_FATAL(LOGF_Refclock, "path %s is too long", path);
return 0;
}
sockfd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (sockfd < 0) {
LOG_FATAL(LOGF_Refclock, "socket() failed");
return 0;
}
UTI_FdSetCloexec(sockfd);
unlink(path);
if (bind(sockfd, (struct sockaddr *)&s, sizeof (s)) < 0) {
LOG_FATAL(LOGF_Refclock, "bind() failed");
return 0;
}
RCL_SetDriverData(instance, (void *)(long)sockfd);
SCH_AddInputFileHandler(sockfd, read_sample, instance);
return 1;
}
static void sock_finalise(RCL_Instance instance)
{
int sockfd;
sockfd = (long)RCL_GetDriverData(instance);
SCH_RemoveInputFileHandler(sockfd);
close(sockfd);
}
RefclockDriver RCL_SOCK_driver = {
sock_initialise,
sock_finalise,
NULL
};
|
