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
|
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include "zdtmtst.h"
const char *test_doc = "Check that pdeath sig is preserved";
const char *test_author = "Pavel Emelianov <xemul@parallels.com>";
static int sigrecvd = 0;
static void sigh(int s, siginfo_t *i, void *d)
{
sigrecvd = 1;
}
#ifndef PR_SET_PDEATH_SIGNAL
#define PR_SET_PDEATH_SIGNAL 1
#endif
int main(int argc, char **argv)
{
int pid, ret, pw[2], pr[2];
test_init(argc, argv);
/*
* Here's what will happen here:
*
* me -(fork)-> P -(fork)-> C
* | |
* +-------------->-(pw)->-+
* +-<-(pr)-<--------------+
*
* We wait for C to prepare himself via pr.
* After C/R we kill P and close pw to wake up
* C. The we wait for it to report back via pr
* which signals has he received.
*/
pipe(pw);
pipe(pr);
pid = fork();
if (pid == 0) {
pid = fork();
if (pid == 0) {
struct sigaction sa = {};
/* C */
close(pw[1]);
close(pr[0]);
sa.sa_sigaction = sigh;
ret = sigaction(SIGUSR1, &sa, NULL);
if (ret == 0)
ret = prctl(PR_SET_PDEATH_SIGNAL, SIGUSR1, 0, 0, 0);
write(pr[1], &ret, sizeof(ret));
read(pw[0], &ret, sizeof(ret));
write(pr[1], &sigrecvd, sizeof(sigrecvd));
} else {
/* P, pid == C */
close(pw[0]);
close(pw[1]);
close(pr[0]);
close(pr[1]);
/* Just hang */
waitpid(pid, NULL, 0);
}
exit(0);
}
/* me, pid == P */
close(pw[0]);
close(pr[1]);
ret = -1;
read(pr[0], &ret, sizeof(ret));
if (ret != 0) {
pr_perror("C start error");
goto out;
}
/*
* P didn't have time to close his pipes?
* That's OK, CRIU should C/R these knots.
*/
test_daemon();
test_waitsig();
out:
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
close(pw[1]);
if (ret == 0) {
read(pr[0], &ret, sizeof(ret));
if (ret != 1)
fail("USR1 isn't delivered");
else
pass();
}
return 0;
}
|
