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
|
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <unistd.h>
#include "fdleak.h"
int main(int argc, char **argv)
{
struct rlimit64 oldrlim;
struct rlimit64 newrlim;
int fd;
CLOSE_INHERITED_FDS;
if (getrlimit64(RLIMIT_NOFILE, &oldrlim) < 0)
{
perror("getrlimit");
exit(1);
}
newrlim.rlim_cur = oldrlim.rlim_max+1;
newrlim.rlim_max = oldrlim.rlim_max;
if (setrlimit64(RLIMIT_NOFILE, &newrlim) == -1)
{
if (errno != EINVAL) {
fprintf(stderr, "setrlimit64 exceeding hardlimit must set errno=EINVAL\n");
exit(1);
}
}
else
{
fprintf(stderr, "setrlimit64 exceeding hardlimit must return -1\n");
exit(1);
}
newrlim.rlim_cur = oldrlim.rlim_max;
newrlim.rlim_max = oldrlim.rlim_max+1;
if (setrlimit64(RLIMIT_NOFILE, &newrlim) == -1)
{
if (errno != EPERM) {
fprintf(stderr, "setrlimit64 changing hardlimit must set errno=EPERM\n");
exit(1);
}
}
else
{
fprintf(stderr, "setrlimit64 changing hardlimit must return -1\n");
exit(1);
}
newrlim.rlim_cur = oldrlim.rlim_cur / 2;
newrlim.rlim_max = oldrlim.rlim_max;
if (setrlimit64(RLIMIT_NOFILE, &newrlim) < 0)
{
perror("setrlimit64");
exit(1);
}
if (getrlimit64(RLIMIT_NOFILE, &newrlim) < 0)
{
perror("getrlimit");
exit(1);
}
if (newrlim.rlim_cur != oldrlim.rlim_cur / 2)
{
fprintf(stderr, "rlim_cur is %llu (should be %llu)\n",
(unsigned long long)newrlim.rlim_cur,
(unsigned long long)oldrlim.rlim_cur / 2);
}
if (newrlim.rlim_max != oldrlim.rlim_max)
{
fprintf(stderr, "rlim_max is %llu (should be %llu)\n",
(unsigned long long)newrlim.rlim_max,
(unsigned long long)oldrlim.rlim_max);
}
newrlim.rlim_cur -= 3; /* allow for stdin, stdout and stderr */
while (newrlim.rlim_cur-- > 0)
{
if (open("/dev/null", O_RDONLY) < 0)
{
perror("open");
}
}
if ((fd = open("/dev/null", O_RDONLY)) >= 0)
{
fprintf(stderr, "open succeeded with fd %d - it should have failed!\n", fd);
}
else if (errno != EMFILE)
{
perror("open");
}
exit(0);
}
|
