linux - 段错误很奇怪

Question

问题:当我试图编译我的文件并运行时，它有分段问题。当我把文件传给 friend (他用的是同一版本的ubuntu)，服务器就可以运行了。我想知道为什么？

下面是我的整个页面的代码。个人感觉没什么问题，不过我贴出来供大家引用。

void readNStoreData ()
{
char words[MAX];
char *wholeLine;
char* delimiter = ",";
int cflag = 0;
int x, count = 0;
char input;

FILE *countryFile;
countryFile = fopen("Countries.txt","r");

if (!countryFile) {
exit(EXIT_FAILURE);
}

while (fgets (words, MAX - 1, countryFile) != NULL)
{
    //atof to convert string to double
    //split a single line into individual tokens indicating , as the delimeter
    //afterwards store them into array
    wholeLine = strtok (words, delimiter);
    strcpy (records [count].TDL, wholeLine);
    wholeLine = strtok (NULL, ",");
    strcpy (records [count].cName, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].FIPS104, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].ISO2, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].ISO3, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    records [count].ISO = atof(wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].cCapital, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].cRegion, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].cCurrencyName, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    strcpy (records [count].cCurrencyCode, wholeLine);
    wholeLine = strtok (NULL, delimiter);
    records [count].cPopulation = atof(wholeLine);
count++;
}
fclose(countryFile); //close file
}

我希望有人能够在某处发现错误。感谢提前帮助过的人!

运行gdb，错误其实是这一行。它位于此函数中。

    l(gdb) frame 1
    l#1  0x08048936 in readNStoreData () at testserver.c:61
    61                      strcpy (records [count].cName, wholeLine);

Answer 1

我强烈建议你学习使用debugger ，例如 GDB .您可以通过 sudo apt-get install gdb

在 ubuntu 上安装它

这是一个简短的tutorial .

Google finds更多examples

编辑:

既然你现在已经运行了 GDB，试着设置一个 breakpoint在运行之前:

(gdb) br testserver.c:61

在您运行之后，您应该能够打印各种变量并查看哪个变量是非法的。