c - linux stat参数指向未初始化的字节？

我有一个循环检查文件的修改时间以对其执行I/O。
我正在使用stat命令。 Valgrind抛出未初始化字节的错误消息..到底是什么错？我已确保文件名列表不为null，并且在将文件作为参数传递给文件之前，文件已经存在，但错误仍然存​​在。

for (i = 0; i < fcount; i++) {
    if (modTimeList[i] == 0) {
        int statret = 0;
        if(fileNameList[i]!=NULL)
        statret = stat(fileNameList[i], &file_stat);  // error
        if (statret == -1) {
            printf(" stat error at %d", i);
        } else {
            modTimeList[i] = file_stat.st_mtime;
            // process
        }
    } else {
        int statret2 = 0;
        if(fileNameList[i]!=NULL)
        statret2 = stat(fileNameList[i], &file_stat); // error
        if (statret2 == -1) {
            printf(" stat error at %d", i);
        } else {
            if (modTimeList[i] < file_stat.st_mtime) {
                // process
            }
        }

    }

}

错误信息

==5153== Syscall param stat64(file_name) points to uninitialised byte(s)
==5153==    at 0x40007F2: ??? (in /lib/ld-2.7.so)
==5153==    by 0x804992B: stat (in /home/)
==5153==    by 0x8049559: checkForFiles (in /home)
==5153==    by 0x804983F: main (in /home)
==5153==  Address 0xbe9271d0 is on thread 1's stack
==5153==  Uninitialised value was created by a stack allocation
==5153==    at 0x804924C: checkForFiles (in /home/)
==5153==

偏差

char fileNameList[100][256];

我正在初始化这样的文件名

sprintf(inputPath, "find -name %s*.ext", filename);
        fpop = popen(inputPath, "r");
        while (fgets(inputPath, sizeof(inputPath) - 1, fpop) != NULL) {
            strcpy(fileNameList[fcount], trimwhitespace(inputPath));
            fcount++;
        }
        pclose(fpop);

最佳答案

由于fileNameList声明为:

char fileNameList[100][256];

if (fileNameList[i] != NULL)始终为true，因为fileNameList[i]不是空指针。您应该将支票更改为:

if ('\0' != *fileNameList[i]) /* Check if empty string. */

但是，为了使其正常工作，您需要初始化fileNameList:

char fileNameList[100][256] = { { 0 } };

关于c - linux stat参数指向未初始化的字节？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/9481004/