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
|
/*
* Shared mapping creation.
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include "arch.h"
#include "log.h"
#include "params.h"
#include "pids.h"
#include "random.h"
#include "shm.h"
void * alloc_shared(unsigned int size)
{
void *ret;
ret = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
if (ret == MAP_FAILED)
return NULL;
return ret;
}
struct shm_s *shm;
#define SHM_PROT_PAGES 30
int create_shm(void)
{
void *p;
unsigned int shm_pages;
shm_pages = ((sizeof(struct shm_s) + page_size - 1) & ~(page_size - 1)) / page_size;
/* Waste some address space to set up some "protection" near the SHM location. */
p = alloc_shared((SHM_PROT_PAGES + shm_pages + SHM_PROT_PAGES) * page_size);
if (p == NULL) {
perror("mmap");
return -1;
}
mprotect(p, SHM_PROT_PAGES * page_size, PROT_NONE);
mprotect(p + (SHM_PROT_PAGES + shm_pages) * page_size,
SHM_PROT_PAGES * page_size, PROT_NONE);
shm = p + SHM_PROT_PAGES * page_size;
memset(shm, 0, sizeof(struct shm_s));
shm->total_syscalls_done = 1;
shm->regenerate = 0;
memset(shm->pids, EMPTY_PIDSLOT, sizeof(shm->pids));
shm->nr_active_syscalls = 0;
shm->nr_active_32bit_syscalls = 0;
shm->nr_active_64bit_syscalls = 0;
memset(shm->active_syscalls, 0, sizeof(shm->active_syscalls));
memset(shm->active_syscalls32, 0, sizeof(shm->active_syscalls32));
memset(shm->active_syscalls64, 0, sizeof(shm->active_syscalls64));
/* Overwritten later in setup_shm_postargs if user passed -s */
shm->seed = new_seed();
/* Set seed in parent thread */
set_seed(0);
return 0;
}
void setup_shm_postargs(void)
{
if (user_set_seed == TRUE) {
shm->seed = init_seed(seed);
/* Set seed in parent thread */
set_seed(0);
}
if (user_specified_children != 0)
shm->max_children = user_specified_children;
else
shm->max_children = sysconf(_SC_NPROCESSORS_ONLN);
if (shm->max_children > MAX_NR_CHILDREN) {
outputerr("Increase MAX_NR_CHILDREN!\n");
exit(EXIT_FAILURE);
}
}
|