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
|
#include "sami.h"
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/poll.h>
#define ACTORS_MAX 1024
#define MESSAGE_LENGTH_MAX 65536
static struct pollfd pfd[ACTORS_MAX];
static SAMI actors[ACTORS_MAX];
char buffer[MESSAGE_LENGTH_MAX];
static int self_fd;
#define log(level, message) \
fprintf("%s:%d [%s]: %s\n", __FILE__, __LINE__, level, message)
static ssize_t findspace(void)
{
size_t i;
for (i = 1; i < ACTORS_MAX; ++i)
if (pfd[i].fd == -1)
return i;
return -1;
}
int SAMI_make(SAMI *actor, SAMI_Handler *handler)
{
int pair[2], res;
ssize_t i, sz;
i = findspace();
if (i == -1)
return 1;
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) == -1)
return 1;
actor->fd = pair[0];
if (!(actor->pid = fork()))
{
close(pair[0]);
actors[0].fd = pfd[0].fd = self_fd;
self_fd = pair[1];
actors[0].pid = -1;
for (i = 1; i < ACTORS_MAX; ++i)
actors[i].fd = -1,
pfd[i].fd = -1,
pfd[i].events = POLLIN;
retry:
waitpid(-1, 0, WNOHANG);
res = poll(pfd, ACTORS_MAX, 0);
if (res == -1)
if (errno == EINTR)
goto retry;
else
log("CRITICAL", strerror(errno)), exit(1);
else if (res == 0)
goto retry;
for (i = 0; i < ACTORS_MAX; ++i)
{
if (!(pfd[i].revents & POLLIN))
break;
sz = recv(pfd[i].fd, buffer, sizeof(buffer), 0);
if (sz == -1)
{
log("WARNING", strerror(errno));
continue;
}
if (handler(&actor[i], buffer, sz))
goto end;
}
goto retry;
end:
exit(0);
}
close(pair[1]);
if (actor->pid == -1)
close(pair[0]);
else
memcpy(&actors[i], actor, sizeof(*actor));
return actor->pid == -1;
}
int SAMI_send(SAMI *actor, void *buf, size_t length)
{
return send(actor->fd, buf, length, 0) == -1;
}
int SAMI_kill(SAMI *actor)
{
int res;
if (actor->pid == -1
|| kill(actor->pid, SIGKILL))
return 1;
}
SAMI *SAMI_parent(void)
{
return &actors[0];
}
|