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b27f8e75 MD |
1 | /* |
2 | * Copyright (C) 2009 Pierre-Marc Fournier | |
1622ba22 | 3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
c39c72ee PMF |
4 | * |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Lesser General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2.1 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
e541a28d PMF |
20 | #define _GNU_SOURCE |
21 | #include <dlfcn.h> | |
22 | #include <sys/types.h> | |
23 | #include <stdio.h> | |
f95b2888 | 24 | #include <pthread.h> |
1622ba22 MD |
25 | |
26 | #define TRACEPOINT_DEFINE | |
27 | #define TRACEPOINT_CREATE_PROBES | |
28 | #include "ust_libc.h" | |
fbd8191b | 29 | |
f95b2888 SS |
30 | #define STATIC_CALLOC_LEN 4096 |
31 | static char static_calloc_buf[STATIC_CALLOC_LEN]; | |
32 | static size_t static_calloc_buf_offset; | |
33 | static pthread_mutex_t static_calloc_mutex = PTHREAD_MUTEX_INITIALIZER; | |
34 | ||
35 | static void *static_calloc(size_t nmemb, size_t size) | |
36 | { | |
37 | size_t prev_offset; | |
38 | ||
39 | pthread_mutex_lock(&static_calloc_mutex); | |
40 | if (nmemb * size > sizeof(static_calloc_buf) - static_calloc_buf_offset) { | |
41 | pthread_mutex_unlock(&static_calloc_mutex); | |
42 | return NULL; | |
43 | } | |
44 | prev_offset = static_calloc_buf_offset; | |
45 | static_calloc_buf_offset += nmemb * size; | |
46 | pthread_mutex_unlock(&static_calloc_mutex); | |
47 | return &static_calloc_buf[prev_offset]; | |
48 | } | |
49 | ||
e541a28d PMF |
50 | void *malloc(size_t size) |
51 | { | |
f95b2888 | 52 | static void *(*plibc_malloc)(size_t size); |
1c184644 PMF |
53 | void *retval; |
54 | ||
b27f8e75 | 55 | if (plibc_malloc == NULL) { |
e541a28d | 56 | plibc_malloc = dlsym(RTLD_NEXT, "malloc"); |
b27f8e75 | 57 | if (plibc_malloc == NULL) { |
e541a28d PMF |
58 | fprintf(stderr, "mallocwrap: unable to find malloc\n"); |
59 | return NULL; | |
60 | } | |
61 | } | |
1c184644 | 62 | retval = plibc_malloc(size); |
1622ba22 | 63 | tracepoint(ust_libc, malloc, size, retval); |
1c184644 PMF |
64 | return retval; |
65 | } | |
66 | ||
67 | void free(void *ptr) | |
68 | { | |
f95b2888 SS |
69 | static void (*plibc_free)(void *ptr); |
70 | ||
71 | /* Check whether the memory was allocated with | |
72 | * static_calloc, in which case there is nothing | |
73 | * to free. | |
74 | */ | |
75 | if ((char *)ptr >= static_calloc_buf && | |
76 | (char *)ptr < static_calloc_buf + STATIC_CALLOC_LEN) { | |
77 | return; | |
78 | } | |
1c184644 | 79 | |
b27f8e75 | 80 | if (plibc_free == NULL) { |
1c184644 | 81 | plibc_free = dlsym(RTLD_NEXT, "free"); |
b27f8e75 | 82 | if (plibc_free == NULL) { |
1c184644 | 83 | fprintf(stderr, "mallocwrap: unable to find free\n"); |
eb0f0951 | 84 | return; |
1c184644 PMF |
85 | } |
86 | } | |
1622ba22 | 87 | tracepoint(ust_libc, free, ptr); |
eb0f0951 | 88 | plibc_free(ptr); |
e541a28d | 89 | } |
f95b2888 SS |
90 | |
91 | void *calloc(size_t nmemb, size_t size) | |
92 | { | |
93 | static void *(*volatile plibc_calloc)(size_t nmemb, size_t size); | |
94 | void *retval; | |
95 | ||
96 | if (plibc_calloc == NULL) { | |
97 | /* | |
98 | * Temporarily redirect to static_calloc, | |
99 | * until the dlsym lookup has completed. | |
100 | */ | |
101 | plibc_calloc = static_calloc; | |
102 | plibc_calloc = dlsym(RTLD_NEXT, "calloc"); | |
103 | if (plibc_calloc == NULL) { | |
104 | fprintf(stderr, "callocwrap: unable to find calloc\n"); | |
105 | return NULL; | |
106 | } | |
107 | } | |
108 | retval = plibc_calloc(nmemb, size); | |
109 | tracepoint(ust_libc, calloc, nmemb, size, retval); | |
110 | return retval; | |
111 | } | |
112 | ||
113 | void *realloc(void *ptr, size_t size) | |
114 | { | |
115 | static void *(*plibc_realloc)(void *ptr, size_t size); | |
116 | void *retval; | |
117 | ||
118 | if (plibc_realloc == NULL) { | |
119 | plibc_realloc = dlsym(RTLD_NEXT, "realloc"); | |
120 | if (plibc_realloc == NULL) { | |
121 | fprintf(stderr, "reallocwrap: unable to find realloc\n"); | |
122 | return NULL; | |
123 | } | |
124 | } | |
125 | retval = plibc_realloc(ptr, size); | |
126 | tracepoint(ust_libc, realloc, ptr, size, retval); | |
127 | return retval; | |
128 | } |