本文介绍了glibc的检测，realloc的（）：无效的指针的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在漫长的code道歉。我有一个简单的问题，但我想我有我的code所以这将是不清楚的地方，我来自哪里。
我得到一个realloc的腐败。我认为，腐败是因为我没有正确地释放。在现实中，我不知道是什么的glibc甚至有传言称或手段。任何一个简单能解释给我吗？
同样遗憾的漫长code。
的#includedraw2.h
＃包括draw2a.h
＃包括draw2b.h为const char Exec_c [] =Java的罐子Sketchpad.jar无效parseFile（FILE * FP，FILE *草绘）{
焦线[MAX_WORD] = {NULL};
字符字[MAX_WORD] = {NULL};
焦炭figureName [MAX_WORD] = {NULL};
结构图* pointsAndname;
长整型countNumberoffigures = 0;
printOutput（）;
长整型温度= 10;
pointsAndname =的malloc（临时*的sizeof（结构图））;
断言（pointsAndname！= NULL）;
而（与fgets（行，MAX_WORD！ - 1，FP）= NULL）{
INT nuRead = sscanf的（行，％S字）;
断言（pointsAndname！= NULL）;
如果（nuRead大于0）{
如果（STRNCMP（字，图，MAX_WORD）== 0）{
countNumberoffigures + = 1;
如果（温度== countNumberoffigures - 1）{
TEMP =温度* 2;
的printf（pointsAndname是％X \\ n，pointsAndname）;
pointsAndname =的realloc（安培; pointsAndname，温度*的sizeof（结构图））;
的printf（pointsAndname是％×realloc的\\ n后，pointsAndname）;
}
断言（pointsAndname！= NULL）;
figureFunction（FP，线条，文字，figureName，countNumberoffigures，pointsAndname + countNumberoffigures）;
}
如果（STRNCMP（字，printFigure，MAX_WORD）== 0）{// 4）读取命令printFigure，图中的名称
如果（countNumberoffigures == 1）{
printFigure（FP，线，countNumberoffigures，pointsAndname + countNumberoffigures）;
}其他{
printFigure（FP，线，countNumberoffigures，pointsAndname + countNumberoffigures - 1）;
}
}
如果（STRNCMP（字，drawFigure，MAX_WORD）== 0）{// 5）读取的命令drawFigure和该图的名称
如果（countNumberoffigures == 1）{
drawFigure（草绘，线，countNumberoffigures，pointsAndname + countNumberoffigures）;
}其他{
drawFigure（草绘，线，countNumberoffigures，pointsAndname + countNumberoffigures - 1）;
}
}
如果（STRNCMP（字，翻译，MAX_WORD）== 0）{// 6）读取命令翻译
如果（countNumberoffigures == 1）{
翻译（行，草绘，countNumberoffigures，pointsAndname + countNumberoffigures）;
}其他{
翻译（行，草绘，countNumberoffigures，pointsAndname + countNumberoffigures - 1）;
}
}
如果（STRNCMP（字，子，MAX_WORD）== 0）{// 7）读取命令孩子和人物的名字
子（行，字，figureName，草绘）;
}
如果（STRNCMP（文字，＃，MAX_WORD）== 0）{// 8）读的是整条生产线，直到\\ n
的printf（线）;
//输出（ANI PO \\ n）;
}
如果（STRNCMP（字，结束，MAX_WORD）== 0）{
fprintf中（草绘，结束\\ n）;
//输出（ANI PO \\ n）;
}
如果（STRNCMP（字，旋转，MAX_WORD）== 0）{
如果（countNumberoffigures == 1）{
旋转（线，草绘，countNumberoffigures，pointsAndname + countNumberoffigures）;
}其他{
旋转（线，草绘，countNumberoffigures，pointsAndname + countNumberoffigures - 1）;
}
}
}
}
免费（pointsAndname-＆GT;顶点）;
免费（pointsAndname）;
}无效processArgument（char参数[]）{
FILE *草绘;
FILE * FP;
FP = FOPEN（参数，R）;
草绘=的popen（Exec_c，W）;
如果（FP == NULL）{
的printf（无法打开管道到％s \\ n，参数）;
出口（EXIT_FAILURE）;
}
如果（草绘== NULL）{
的printf（无法打开管道到％s \\ n，参数）;
出口（EXIT_FAILURE）;
}其他{
parseFile（FP，草绘）;
如果（FCLOSE（FP）== EOF）{
的printf（无法关闭管道到％s \\ n，参数）;
出口（EXIT_FAILURE）;
}
如果（pclose函数（草绘）== -1）{//如果（pclose函数（草绘）== -1）{
fprintf中（标准错误，draw_line错误：无法关闭管道到％s \\ n，Exec_c）; // fprintf中（标准错误，，E）;
出口（EXIT_FAILURE）;
}
}
}INT主（INT ARGC，CHAR *的argv []）{
INT I;
如果（的argc 2）{
的printf（％S \\ n，评论（0））;
出口（EXIT_FAILURE）;
}其他{
对于（i = 1; I＆LT; ARGC，我++）{
processArgument（的argv [I]）;
}
}
返回0;
}
的#includedraw2.h
＃包括draw2a.h无效printOutput（）{
的printf（./ DRAW2开始：）; fflush（标准输出）;
系统（日期\\ n）;
}
/ *送什么都没有孩子画板（在特定行）后* /
无效子（焦线[]，CHAR字[]，CHAR nameFigure []，FILE *草绘）{
sscanf的（行，％s％S字，nameFigure）;
fprintf中（草绘％s \\ n，＆安培;线[6]）;
}/ *我从图线到底线图阅读构建结构。* /
无效figureFunction（FILE * FP，焦线[]，CHAR字[]，CHAR figureName []，长整型countNumberoffigures，结构图* figureHere）{
双startx的，starty;
长整型温度= 10;
figureHere-＆GT;顶点=的malloc（临时*的sizeof（结构pointxy））;
sscanf的（行，％s％S％LF％LF％* S字，figureHere-＆GT; figureName，和放大器;运行startx，＆安培; starty）;
的printf（这是figureHere-＆gt;在figureFunction内顶点：％S \\ n;顶点，figureHere-＆GT）;
（*（figureHere-＆GT;顶点））X = startx的;
（*（figureHere-＆GT;顶点））。Y = starty;
与fgets（行，MAX_WORD - 1，FP）;
INT nuRead = sscanf的（行，％S字）;
长INT I = 1;
而（STRNCMP（字，结束，MAX_WORD）！= 0）{
如果（STRNCMP（字，＃，MAX_WORD）== 0）{
的printf（％S，行）;
}
如果（STRNCMP（字，画，MAX_WORD）== 0）{
//输出（ANI勒珀MAGIA ????? \\ n \\ n）;
sscanf的（行，％s％LF％LF，字和放大器;运行startx，＆安培; starty）;
//的printf（这是我运行startx和starty：％LF％LF \\ n \\ n，运行startx，starty）;
figureHere-＆GT;顶点[I]的.x = figureHere-＆GT;顶点[I-1] .X + startx的;
figureHere-＆GT;顶点[I] .Y = figureHere-＆GT;顶点[I-1] .Y + starty;
我+ = 1;
}
与fgets（行，MAX_WORD - 1，FP）;
nuRead = sscanf的（行，％S字）;
如果（临时== figureHere-＆GT; countPoints）{
TEMP =温度* 2;
figureHere-＆GT;顶点=的realloc（figureHere-＆GT;顶点，温度*的sizeof（结构pointxy））;
}
}
figureHere-＆GT; countPoints = I;
}
的#include＆LT;＆stdio.h中GT;
＃包括LT＆;＆string.h中GT;
＃包括LT＆;＆文件ctype.h GT;
＃包括LT＆;＆stdlib.h中GT;
＃包括LT＆;＆math.h中GT;
＃包括LT＆;＆ASSERT.H GT;无效parseFile（FILE * FP，FILE *草绘）;
无效processArgument（char参数[]）;
无效printOutput（）;＃定义MAX_WORD 256
＃定义initial_size 17EXTERN为const char参数[];/ *对于非C99库函数的原型* /
FILE * popen这（为const char *，为const char *）;
INT函数，pclose（FILE *）;
结构pointxy {
双X;
双Y;
};结构图{
焦炭figureName [MAX_WORD]
结构pointxy *顶点;
长整型countPoints;
};
*** glibc的检测*** ./draw2：realloc的（）：无效的指针：0xbf9c3a28 ***
=======回溯：=========
/lib/libc.so.6(realloc+0x3a8)[0x400cb548]
/lib/libc.so.6(realloc+0x3c)[0x400cb1dc]
./draw2[0x8048ab8]
./draw2[0x8048ec1]
./draw2[0x8048f84]
/lib/libc.so.6(__libc_start_main+0xe0)[0x40072390]
./draw2[0x8048891]
=======存储器映射：========
08048000-0804a000 R-XP 00000000 00:16 160237 /家庭/ dsk07 / ugrad / pkardash / C201 / assignment2 / DRAW2
0804a000-0804b000 RW-P 00002000 00:16 160237 /家庭/ dsk07 / ugrad / pkardash / C201 / assignment2 / DRAW2
0804b000-0804c000 RW-P 00000000 00:00 0
09283000-092a4000 RW-P 00000000 00:00 0堆]
40000000-4001c000 R-XP 00000000 08:01 94922 /lib/ld-2.7.so
4001c000-4001d000 - [R - P 0001b000 08:01 94922 /lib/ld-2.7.so
4001d000-4001e000 RW-P 0001c000 08:01 94922 /lib/ld-2.7.so
4001e000-40022000 RW-P 00000000 00:00 0
40022000-4002c000 R-XP 00000000 08:07 150880 /usr/lib/libgcc_s.so.1
4002c000-4002d000 RW-P 00009000 08:07 150880 /usr/lib/libgcc_s.so.1
40036000-4005a000 R-XP 00000000 08:01 94889 /lib/libm-2.7.so
4005a000-4005b000 - [R - P 00023000 08:01 94889 /lib/libm-2.7.so
4005b000-4005c000 RW-P 00024000 08:01 94889 /lib/libm-2.7.so
4005c000-401a1000 R-XP 00000000 08:01 94899 /lib/libc-2.7.so
401a1000-401a2000 --- p 00145000 08:01 94899 /lib/libc-2.7.so
401a2000-401a4000 - [R - P 00145000 08:01 94899 /lib/libc-2.7.so
401a4000-401a5000 RW-P 00147000 08:01 94899 /lib/libc-2.7.so
401a5000-401a9000 RW-P 00000000 00:00 0
bf9b0000-RW bf9c5000-P 00000000 00:00 0 [堆栈]
ffffe000-fffff000 R-XP 00000000 00:00 0 VDSO]
使：*** [运行]中止
解决方案
glibc的是告诉你你传递在不能一直通过malloc / realloc的返回地址。这是因为，您将在 pointsAndName 堆栈变量的地址。您需要在价值传递，这是您从的malloc 收什么。此外，当你调用的realloc ，你应该使用一个临时变量。这样一来，如果的realloc 失败，你仍然可以自由的原始值。
结构图* tempPtr = realloc的（pointsAndname，温度*的sizeof（结构图））;
如果（tempPtr == NULL）
{
//处理分配错误...
免费（pointsAndname）;
}
pointsAndname = tempPtr;
I apologize for the lengthy code. I have a simple question, but I thought I include my code so it will be clear where I am coming from.I get a realloc corruption. I think the corruption is because I am not freeing correctly. In reality I am not sure what glibc even says or means. Can any one briefly explain that to me?Again sorry for the lengthy code.
#include "draw2.h"
#include "draw2a.h"
#include "draw2b.h"
const char Exec_c[] = "java -jar Sketchpad.jar";
void parseFile(FILE * fp, FILE *sketcher){
char line [MAX_WORD] = {"NULL"};
char word [MAX_WORD] = {"NULL"};
char figureName [MAX_WORD] = {"NULL"};
struct figure *pointsAndname;
long int countNumberoffigures = 0;
printOutput();
long int temp = 10;
pointsAndname = malloc(temp * sizeof(struct figure));
assert(pointsAndname != NULL);
while ( fgets(line, MAX_WORD - 1, fp) != NULL ){
int nuRead = sscanf(line, "%s", word);
assert(pointsAndname != NULL);
if ( nuRead > 0 ){
if(strncmp(word, "Figure", MAX_WORD)==0){
countNumberoffigures += 1;
if (temp == countNumberoffigures - 1){
temp = temp * 2;
printf("pointsAndname is %x\n", pointsAndname);
pointsAndname = realloc(&pointsAndname, temp * sizeof(struct figure));
printf("pointsAndname is %x after realloc\n", pointsAndname);
}
assert(pointsAndname != NULL);
figureFunction(fp,line, word, figureName, countNumberoffigures, pointsAndname + countNumberoffigures);
}
if(strncmp(word, "printFigure", MAX_WORD)==0){ //4)read the command printFigure, name of the figure
if (countNumberoffigures == 1){
printFigure(fp, line, countNumberoffigures, pointsAndname + countNumberoffigures);
}else{
printFigure(fp, line, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
}
}
if(strncmp(word, "drawFigure", MAX_WORD)==0){ //5)read the command drawFigure and the name of the figure
if (countNumberoffigures == 1){
drawFigure(sketcher, line, countNumberoffigures, pointsAndname + countNumberoffigures);
}else{
drawFigure(sketcher, line, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
}
}
if(strncmp(word, "translate", MAX_WORD)==0){ //6)read the command translate
if (countNumberoffigures == 1){
translate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures);
}else{
translate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
}
}
if(strncmp(word, "child", MAX_WORD)==0){ //7)reads command child and the name of the figure
child(line, word, figureName, sketcher);
}
if(strncmp(word, "#", MAX_WORD)==0){ //8)reads the whole line until the \n
printf(line);
//printf("ani po\n");
}
if(strncmp(word, "end", MAX_WORD)==0){
fprintf (sketcher, "end\n");
//printf("ani po\n");
}
if(strncmp(word, "rotate", MAX_WORD)==0){
if (countNumberoffigures == 1){
rotate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures);
}else{
rotate(line, sketcher, countNumberoffigures, pointsAndname + countNumberoffigures - 1);
}
}
}
}
free(pointsAndname->vertices);
free(pointsAndname);
}
void processArgument(char argument[]){
FILE *sketcher;
FILE *fp;
fp = fopen (argument, "r");
sketcher = popen(Exec_c, "w");
if (fp == NULL){
printf ("Could not open pipe to %s\n", argument);
exit (EXIT_FAILURE);
}
if (sketcher == NULL){
printf ("Could not open pipe to %s\n", argument);
exit (EXIT_FAILURE);
}else{
parseFile(fp, sketcher);
if(fclose(fp)==EOF){
printf("couldn't close pipe to %s.\n", argument);
exit(EXIT_FAILURE);
}
if (pclose(sketcher) == -1){ //if (pclose(sketcher) == -1){
fprintf(stderr, "draw_line error: couldn't close pipe to %s.\n", Exec_c);//fprintf(stderr,"",E);
exit(EXIT_FAILURE);
}
}
}
int main (int argc, char *argv[]){
int i;
if ( argc < 2 ){
printf ("%s\n", "0 comment(s)");
exit(EXIT_FAILURE);
}else{
for (i = 1; i < argc; i++){
processArgument(argv[i]);
}
}
return 0;
}
#include "draw2.h"
#include "draw2a.h"
void printOutput(){
printf("./draw2 started on:");
fflush(stdout);
system("date\n");
}
/*send what ever there is after the child to sketchpad(in that specific line)*/
void child (char line[], char word[], char nameFigure[], FILE * sketcher){
sscanf(line, "%s%s", word, nameFigure);
fprintf (sketcher, "%s\n", &line[6]);
}
/*I construct the struct by reading from the Figure line to the end figure line.*/
void figureFunction (FILE * fp, char line[], char word[], char figureName[], long int countNumberoffigures, struct figure *figureHere){
double startx, starty;
long int temp = 10;
figureHere->vertices = malloc(temp * sizeof(struct pointxy));
sscanf(line, "%s%s%lf%lf%*s", word, figureHere->figureName, &startx, &starty);
printf("This is the figureHere->vertices inside the figureFunction: %s\n", figureHere->vertices);
(*(figureHere->vertices)).x = startx;
(*(figureHere->vertices)).y = starty;
fgets(line, MAX_WORD - 1, fp);
int nuRead = sscanf(line, "%s", word);
long int i = 1;
while (strncmp(word, "End", MAX_WORD)!=0){
if (strncmp(word, "#", MAX_WORD) == 0){
printf("%s",line);
}
if (strncmp(word, "draw", MAX_WORD) == 0){
//printf("lepo ani magia?????\n\n");
sscanf (line, "%s%lf%lf", word, &startx, &starty);
//printf("this is my startx and starty: %lf %lf\n\n",startx, starty);
figureHere->vertices[i].x = figureHere->vertices[i-1].x + startx;
figureHere->vertices[i].y = figureHere->vertices[i-1].y + starty;
i += 1;
}
fgets(line, MAX_WORD - 1, fp);
nuRead = sscanf(line, "%s", word);
if (temp == figureHere->countPoints){
temp = temp * 2;
figureHere->vertices = realloc(figureHere->vertices, temp * sizeof(struct pointxy));
}
}
figureHere->countPoints = i;
}
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
void parseFile(FILE * fp, FILE * sketcher);
void processArgument(char argument[]);
void printOutput();
#define MAX_WORD 256
#define initial_size 17
extern const char argument[];
/* prototypes for non-c99 library functions */
FILE* popen(const char*, const char*);
int pclose(FILE*);
struct pointxy {
double x;
double y;
};
struct figure{
char figureName[MAX_WORD];
struct pointxy *vertices;
long int countPoints;
};
*** glibc detected *** ./draw2: realloc(): invalid pointer: 0xbf9c3a28 ***
======= Backtrace: =========
/lib/libc.so.6(realloc+0x3a8)[0x400cb548]
/lib/libc.so.6(realloc+0x3c)[0x400cb1dc]
./draw2[0x8048ab8]
./draw2[0x8048ec1]
./draw2[0x8048f84]
/lib/libc.so.6(__libc_start_main+0xe0)[0x40072390]
./draw2[0x8048891]
======= Memory map: ========
08048000-0804a000 r-xp 00000000 00:16 160237 /home/dsk07/ugrad/pkardash/c201/assignment2/draw2
0804a000-0804b000 rw-p 00002000 00:16 160237 /home/dsk07/ugrad/pkardash/c201/assignment2/draw2
0804b000-0804c000 rw-p 00000000 00:00 0
09283000-092a4000 rw-p 00000000 00:00 0 [heap]
40000000-4001c000 r-xp 00000000 08:01 94922 /lib/ld-2.7.so
4001c000-4001d000 r--p 0001b000 08:01 94922 /lib/ld-2.7.so
4001d000-4001e000 rw-p 0001c000 08:01 94922 /lib/ld-2.7.so
4001e000-40022000 rw-p 00000000 00:00 0
40022000-4002c000 r-xp 00000000 08:07 150880 /usr/lib/libgcc_s.so.1
4002c000-4002d000 rw-p 00009000 08:07 150880 /usr/lib/libgcc_s.so.1
40036000-4005a000 r-xp 00000000 08:01 94889 /lib/libm-2.7.so
4005a000-4005b000 r--p 00023000 08:01 94889 /lib/libm-2.7.so
4005b000-4005c000 rw-p 00024000 08:01 94889 /lib/libm-2.7.so
4005c000-401a1000 r-xp 00000000 08:01 94899 /lib/libc-2.7.so
401a1000-401a2000 ---p 00145000 08:01 94899 /lib/libc-2.7.so
401a2000-401a4000 r--p 00145000 08:01 94899 /lib/libc-2.7.so
401a4000-401a5000 rw-p 00147000 08:01 94899 /lib/libc-2.7.so
401a5000-401a9000 rw-p 00000000 00:00 0
bf9b0000-bf9c5000 rw-p 00000000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
make: *** [run] Aborted
解决方案
glibc is telling you you're passing in an address that couldn't have been returned from malloc/realloc. This is because you're passing in the address of the pointsAndName stack variable. You need to pass in the value, which is what you received from malloc. Also, whenever you call realloc, you should use a temporary variable. That way, if the realloc fails, you still free the original value.
struct figure *tempPtr = realloc(pointsAndname, temp * sizeof(struct figure));
if(tempPtr == NULL)
{
// Handle allocation error...
free(pointsAndname);
}
pointsAndname = tempPtr;
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