Fix copy&paste error in kcompat.h header check
[lttng-ust.git] / libmallocwrap / mallocwrap.c
1 #define _GNU_SOURCE
2 #include <dlfcn.h>
3 #include <sys/types.h>
4 #include <stdio.h>
5
6 #include "marker.h"
7
8 //INTERCEPT_PROTOTYPE(void, malloc, size_t size)
9 //INTERCEPT_TRACE("size %d", size)
10 //INTERCEPT_CALL_ARGS(size)
11 //INTERCEPT()
12 //
13 //#define INTERCEPT_FUNC(type, name, args...) \
14 //__I_FUNC_TYPE(type) \
15 //__I_FUNC_NAME(name) \
16 //__I_FUNC_ARGS(args)
17 //
18 //#define INTERCEPT_TRACE(fmt, args...) \
19 //#define __I_TRACE_FMT fmt \
20 //#define __I_TRACE_ARGS args
21 //
22 //#define INTERCEPT_CALL_ARGS(args...) \
23 //#define __I_CALL_ARGS args
24 //
25 //#define INTERCEPT() \
26 //__I_FUNC_TYPE __I_FUNC_NAME(__I_FUNC_ARGS) \
27 //{ \
28 // static __I_FUNC_TYPE (*plibc_ ## __I_FUNC_NAME)(args) = NULL; \
29 // \
30 // if(plibc_ ## __I_FUNC_NAME == NULL) { \
31 // plibc_ ## __I_FUNC_NAME = dlsym(RTLD_NEXT, "malloc"); \
32 // if(plibc_ ## __I_FUNC_NAME == NULL) { \
33 // fprintf(stderr, "mallocwrap: unable to find malloc\n"); \
34 // return NULL; \
35 // } \
36 // } \
37 // \
38 // trace_mark(ust, __I_FUNC_NAME, __I_TRACE_FMT, __I_TRACE_ARGS); \
39 // \
40 // return plibc_ ## __I_FUNC_NAME (__I_CALL_ARGS); \
41 //}
42
43 void *malloc(size_t size)
44 {
45 static void *(*plibc_malloc)(size_t size) = NULL;
46
47 void *retval;
48
49 if(plibc_malloc == NULL) {
50 plibc_malloc = dlsym(RTLD_NEXT, "malloc");
51 if(plibc_malloc == NULL) {
52 fprintf(stderr, "mallocwrap: unable to find malloc\n");
53 return NULL;
54 }
55 }
56
57 retval = plibc_malloc(size);
58
59 trace_mark(ust, malloc, "size %d ptr %p", (int)size, retval);
60
61 return retval;
62 }
63
64 void free(void *ptr)
65 {
66 static void *(*plibc_free)(void *ptr) = NULL;
67
68 if(plibc_free == NULL) {
69 plibc_free = dlsym(RTLD_NEXT, "free");
70 if(plibc_free == NULL) {
71 fprintf(stderr, "mallocwrap: unable to find free\n");
72 return NULL;
73 }
74 }
75
76 trace_mark(ust, free, "%p", ptr);
77
78 return plibc_free(ptr);
79 }
80
81 MARKER_LIB
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