检测到glibc，realloc（）：指针无效
我为冗长的代码道歉。 我有一个简单的问题，但我认为我包含了我的代码，所以我很清楚我来自哪里。 我得到了realloc腐败。 我认为腐败是因为我没有正确解放。 实际上我不确定glibc甚至说或意味着什么。 任何人都能简单地向我解释一下吗？ 再次抱歉冗长的代码。
#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 #include #include #include #include #include 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
glibc告诉你，你正在传递一个无法从malloc / realloc返回的地址。 这是因为您传递了pointsAndName堆栈变量的地址。 你需要传入值，这是你从malloc收到的。 此外，无论何时调用realloc ，都应使用临时变量。 这样，如果realloc失败，您仍然可以释放原始值。
struct figure *tempPtr = realloc(pointsAndname, temp * sizeof(struct figure)); if(tempPtr == NULL) { // Handle allocation error... free(pointsAndname); } pointsAndname = tempPtr;