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内存泄漏
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检测代码
使用链表记录每个malloc返回的指针，释放时从链表中查找并删除找到对应指针的节点。
最终输出链表，该链表记录了所有没有释放的动态内存。
#include#include #include #include #include <malloc.h> #include <string.h> #include #define output_file "leak_detector_report.txt" typedef struct { void* addr; //the memory address unsigned char file[128]; //the file of the memory alloc statement unsigned int line; //the line of the memory alloc statment unsigned int size; //the size of the memory alloced }addr_info; typedef struct addr_info_node{ addr_info info; struct addr_info_node *next; }addr_info_node, *addr_info_list; pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER; addr_info_list g_head = NULL; void *malloc_detector(int size, unsigned char *file, unsigned int line) { void *ptr = malloc(size); if (NULL == ptr) { return NULL; } addr_info_node *node = (addr_info_node*)malloc(sizeof(addr_info_node)); if (NULL == node) { return NULL; } memset(node, 0, sizeof(addr_info_node)); node->info.addr = ptr; node->info.line = line; node->info.size = size; strncpy(node->info.file,file,127); node->next = NULL; pthread_mutex_lock(&g_mutex); if (NULL == g_head) { g_head = (addr_info_node*)malloc(sizeof(addr_info_node)); if (NULL == g_head) { free(node); return NULL; } memset(g_head, 0, sizeof(addr_info_node)); } addr_info_node *tail = g_head; while (NULL != tail->next) { tail = tail->next; } tail->next = node; pthread_mutex_unlock(&g_mutex); return ptr; } void free_detector(void *addr) { //Find and Delete the info which has the address==addr from Alloc_Info_List head /*we only detecte the memory-leak, not the wrong free-addr which not in the addr_info_list*/ pthread_mutex_lock(&g_mutex); addr_info_node *node = g_head; while (NULL != node->next) { if (node->next->info.addr == addr) { free(addr); node->next = node->next->next; break; } printf("2 file %s line %d,addr %p,size %d\n", node->info.file,node->info.line,node->info.addr,node->info.size); node = node->next; } pthread_mutex_unlock(&g_mutex); } void report_info() { FILE *fp_write=fopen(output_file,"w+"); if(!fp_write) { printf("can't open file\n"); return; } char info[sizeof(addr_info)+128]; pthread_mutex_lock(&g_mutex); addr_info_node *node = g_head->next; while (NULL != node) { sprintf(info,"memory leak:file %s line %d,addr %p,size %d\n", node->info.file,node->info.line,node->info.addr,node->info.size); fwrite(info,strlen(info)+1,1,fp_write); node = node->next; } fclose(fp_write); pthread_mutex_unlock(&g_mutex); } void thread1_malloc_free() { void *ptr = malloc_detector(100, __FILE__, __LINE__); ptr = malloc_detector(200, __FILE__, __LINE__); free_detector(ptr); ptr = malloc_detector(200, __FILE__, __LINE__); } void thread2_malloc_free() { void *ptr = malloc_detector(400, __FILE__, __LINE__); ptr = malloc_detector(800, __FILE__, __LINE__); free_detector(ptr); ptr = malloc_detector(1600, __FILE__, __LINE__); } int main() { pthread_t thread1, thread2; pthread_create(&thread1, NULL, (void *)&thread1_malloc_free, NULL); pthread_create(&thread2, NULL, (void *)&thread2_malloc_free, NULL); pthread_join(thread1, NULL); pthread_join(thread2, NULL); report_info(); }
运行输出
Original: https://www.cnblogs.com/amos01/p/14460913.html
Author: Amos01
Title: C/C++内存泄漏检测方法
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