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
|
/*
sendtoxlog - example for retrieving data from xlog
Copyright (C) 2002 -2005 Joop Stakenborg <pg4i@amsat.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 3 of the License, or
(at your option) any later version.
Xlog 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 xlog. If not, see <http://www.gnu.org/licenses/>.
*/
/*
*
* Compile with 'gcc -o fromxlog fromxlog.c'
* See the provided README for more details.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>
#define KEY 6146 /* unique key */
#define SHMSIZE 40 /* size of shared memory */
int
main (void)
{
int shmid = -1;
void *pt;
for (;;)
{ /* allocate a shared memory segment */
if ((shmid = shmget ((key_t) KEY, SHMSIZE, 0600)) < 0)
{
fprintf (stderr, "No logging program...\n");
shmid = -1;
}
if (shmid != -1)
{ /* attach the shared memory segment */
if ((pt = (shmat (shmid, NULL, 0))) == (void *) -1)
{
perror ("fromlog - shmat");
exit (1);
}
fprintf (stdout, "%s\n", (char *) pt);
shmdt ((void *) pt); /* detach the shared memory segment */
}
sleep (1);
}
exit (0);
}
|
