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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#define _GNU_SOURCE
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static char tmpbuff[1024];
static unsigned long tmppos = 0;
static unsigned long tmpallocs = 0;
static int out = -1;
static int prevent_recursion = 0;
/*=========================================================
* * interception points
* */
static void * (*myfn_malloc)(size_t size);
static void (*myfn_free)(void* ptr);
static void * (*myfn_calloc)(size_t nmemb, size_t size);
static void * (*myfn_realloc)(void* ptr, size_t size);
static void * (*myfn_memalign)(size_t alignment, size_t size);
static void write_output(const char* fmt, ...)
{
if (!prevent_recursion)
{
prevent_recursion = 1;
/* lockf(out, F_LOCK, 0); */
va_list args;
va_start(args, fmt);
vdprintf(out, fmt, args);
va_end(args);
/* lockf(out, F_ULOCK, 0); */
prevent_recursion = 0;
}
}
static void init()
{
out = open("chattymalloc.data", O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (out == -1)
{
fprintf(stderr, "failed to open output file with %d\n", errno);
exit(1);
}
myfn_malloc = dlsym(RTLD_NEXT, "malloc");
myfn_free = dlsym(RTLD_NEXT, "free");
myfn_calloc = dlsym(RTLD_NEXT, "calloc");
myfn_realloc = dlsym(RTLD_NEXT, "realloc");
myfn_memalign = dlsym(RTLD_NEXT, "memalign");
if (!myfn_malloc || !myfn_free || !myfn_calloc || !myfn_realloc || !myfn_memalign)
{
fprintf(stderr, "Error in `dlsym`: %s\n", dlerror());
exit(1);
}
}
void *malloc(size_t size)
{
static int initializing = 0;
if (myfn_malloc == NULL)
{
if (!initializing)
{
initializing = 1;
init();
initializing = 0;
}
else
{
if (tmppos + size < sizeof(tmpbuff))
{
void *retptr = tmpbuff + tmppos;
tmppos += size;
++tmpallocs;
return retptr;
}
else
{
fprintf(stderr, "%d in %d allocs\n", tmppos, tmpallocs);
fprintf(stderr, "jcheck: too much memory requested during initialisation - increase tmpbuff size\n");
exit(1);
}
}
}
void *ptr = myfn_malloc(size);
write_output("m %zu %p\n", size, ptr);
return ptr;
}
void free(void *ptr)
{
// something wrong if we call free before one of the allocators!
if (myfn_malloc == NULL)
init();
if (!(ptr >= (void*) tmpbuff && ptr <= (void*)(tmpbuff + tmppos)))
{
write_output("f %p\n", ptr);
myfn_free(ptr);
}
}
void* realloc(void *ptr, size_t size)
{
if (myfn_realloc == NULL)
{
void *nptr = malloc(size);
if (nptr && ptr)
{
memmove(nptr, ptr, size);
free(ptr);
}
return nptr;
}
void* nptr = myfn_realloc(ptr, size);
write_output("r %p %zu %p\n", ptr, size, nptr);
return nptr;
}
void* calloc(size_t nmemb, size_t size)
{
if (myfn_calloc == NULL)
{
void *ptr = malloc(nmemb*size);
if (ptr)
memset(ptr, 0, nmemb*size);
return ptr;
}
void* ptr = myfn_calloc(nmemb, size);
write_output("c %zu %zu %p\n", nmemb, size, ptr);
return ptr;
}
void* memalign(size_t alignment, size_t size)
{
if (myfn_memalign == NULL)
{
fprintf(stderr, "called memalign before or during init");
exit(1);
}
void* ptr = myfn_memalign(alignment, size);
write_output("mm %zu %zu %p\n", alignment, size, ptr);
return ptr;
}
|
