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
|
/*
* (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unistd.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "event.h"
struct evfd {
int read;
int fds[2];
};
struct evfd *create_evfd(void)
{
struct evfd *e;
e = calloc(1, sizeof(struct evfd));
if (e == NULL)
return NULL;
if (pipe(e->fds) == -1) {
free(e);
return NULL;
}
fcntl(e->fds[0], F_SETFL, O_NONBLOCK);
return e;
}
void destroy_evfd(struct evfd *e)
{
close(e->fds[0]);
close(e->fds[1]);
free(e);
}
int get_read_evfd(struct evfd *evfd)
{
return evfd->fds[0];
}
int write_evfd(struct evfd *evfd)
{
int data = 0, ret = 0;
if (evfd->read == 0)
ret = write(evfd->fds[1], &data, sizeof(data));
evfd->read++;
return ret;
}
int read_evfd(struct evfd *evfd)
{
int data, ret = 0;
if (--evfd->read == 0)
ret = read(evfd->fds[0], &data, sizeof(data));
return ret;
}
|
