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
|
/* cleanutmp.c
chown root.utmp cleanutmp
chmod 2711 cleanutmp
*/
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "lib.h"
void ops(int n, const char *s0, const char *s1) {
write(2,s0,str_len(s0));
write(2,s1,str_len(s1));
write(2,"\n",1);
_exit(n);
}
#ifdef USE_LIBC_UTMP
int main () {
struct utmp_type *ut, u;
setutent();
while (f_getutent()) {
if (ut->ut_type != USER_PROCESS) continue;
if (kill(ut->ut_pid, 0) && errno == ESRCH) {
u = *ut;
u.ut_type = DEAD_PROCESS;
u.ut_tv.tv_sec = time(0);
f_setutent();
if (0==f_pututline(&u))
ops(2,"error writing to: ", Utmp_File);
f_updwtmp(Wtmp_File, &u);
}
}
f_endutent();
return 0;
}
#else
int main() {
int fd,wfd;
struct utmp_type ut[1];
off_t pos=0;
if ((fd = open(Utmp_File,O_RDWR)) <0 &&
(fd = open(Utmp_File,O_RDONLY)) <0)
ops(1,"error opening: ", Utmp_File);
while (utmp_io(fd,ut,F_RDLCK)) {
pos += UTMP_SIZE;
if (ut->ut_type != USER_PROCESS) continue;
if (kill(ut->ut_pid, 0) && errno == ESRCH) {
ut->ut_type = DEAD_PROCESS;
ut->ut_tv.tv_sec = time(0);
pos -= UTMP_SIZE;
if (lseek(fd, pos, SEEK_SET) != pos ||
!utmp_io(fd,ut,F_WRLCK))
ops(2,"error writing to: ", Utmp_File);
pos += UTMP_SIZE;
wfd=open(Wtmp_File, O_WRONLY|O_APPEND);
write(wfd, ut, UTMP_SIZE);
close(wfd);
}
}
close(fd);
return 0;
}
#endif
|
