UNIX 文件信息

Question

我正在尝试制作一个程序来监视一个文件夹，并检查其中的任何文件的内容或权限是否被修改。

我的代码在这里：

void verifyChanges(char *directory, int duration, int interval, char *logfile, bool lastModified, bool changedPermissions){

 //Definição de variáveis
int i, j;
int timeint = 0;

char * initialFileList[MAX_LIST_SIZE];
char * finalFileList[MAX_LIST_SIZE];
struct stat initialStats[MAX_STRUCT_SIZE];
struct stat finalStats[MAX_STRUCT_SIZE];

bool found;

FILE *log = fopen(logfile, "a");
while(timeint <= (duration*SECONDS)){

int initialFileNr = getFileNameStats(directory, initialFileList, initialStats);
sleep(interval);
int finalFileNr = getFileNameStats(directory, finalFileList, finalStats);

//Check file names of finalFileList thas does not appear in initialFileList
for (i = 0; i < finalFileNr; i++){
  found = false;
  for (j = 0; j < initialFileNr; j++){
if(strcmp(finalFileList[i], initialFileList[j]) == 0){
  found = true;
  break;
}
  }
  if(!found){
char *time = formatTime(finalStats[i].st_mtime);
char *time_tok = strtok(time, " ");
time_tok = strtok(0, " ");
time_tok = strtok(0, " ");
time_tok = strtok(0, " ");
    //This fprintf does not print the filename. What is wrong??
fprintf(log, "%-15s %-8s %-51s CRE\n", finalFileList[i], time_tok, directory);
fflush(log);
printf("New File Created!!!!!\n");
  }
}

//Same as befor, but this time searching for deleted files
for(i = 0; i < initialFileNr; i++){
  found = false;
  for(j = 0; j < finalFileNr; j++){
if(strcmp(initialFileList[i], finalFileList[j]) == 0){
  found = true;
  break;
}
  }
  if(!found){
char *time = formatTime(initialStats[i].st_mtime);
char *time_tok = strtok(time, " ");
time_tok = strtok(0, " ");
time_tok = strtok(0, " ");
time_tok = strtok(0, " ");
fprintf(log, "%-15s %-8s %-51s DEL\n", initialFileList[i], time_tok, directory);
fflush(log);
printf("Deleted!!!!!\n");
  }
}

//At last, checking if common files on first and second list was modified
for(i = 0; i < initialFileNr; i++){
  for(j = 0; j < finalFileNr; j++){
if(srtcmp(initialFileList[i], finalFileList[j]) == 0){
  //checking content changes
  if((initialStats[i].st_mtime != finalStats[j].st_mtime) && lastModified){
    char *time = formatTime(finalStats[j].st_mtime);
    char *time_tok = strtok(time, " ");
    time_tok = strtok(0, " ");
    time_tok = strtok(0, " ");
    time_tok = strtok(0, " ");
    fprintf(log, "%-15s %-8s %-51s EDI\n", finalFileList[j], time_tok, directory);
    fflush(log);
    printf("Changed Content!!!!!\n");
  }
  //Verificar alterações às permissões
  if((initialStats[i].st_mode != finalStats[j].st_mode) && changedPermissions){
    char *time = formatTime(finalStats[j].st_mtime);
    char *time_tok = strtok(time, " ");
    time_tok = strtok(0, " ");
    time_tok = strtok(0, " ");
    time_tok = strtok(0, " ");
    fprintf(log, "%-15s %-8s %-51s PER\n", finalFileList[j], time_tok, directory);
    fflush(log);
    printf("Changed Permissionss!!!!!\n");
   }
  }
     }
    }
   timeint += interval;
  }
  fclose(log);
}

我知道这段代码没有很好的性能，但现在，我想要的是让它工作。我还有另一个函数可以获取该文件夹内的文件名和统计信息，但该函数运行正常。

当我尝试删除一个名称低于该文件夹内其他文件的文件夹（按字母顺序排列）时，程序告诉我我已经创建了一个文件，而不是删除它。我怀疑这可能是索引的问题，但我不知道它在哪里。

预先感谢您的每一个帮助！

PS

另一个函数，获取文件名和统计信息。这里有什么问题吗？

int getFileNameStats(char *directory, char *fileList[], struct stat stats[]){
  int i = 0;
  DIR *dirp;
  struct dirent *direntp;
  struct stat stat_buf;
  char fileName[MAX_DIR_SIZE];

  dirp = opendir(directory);

  while ((direntp = readdir(dirp)) != NULL)
 {
    sprintf(fileName, "%s/%s", directory, direntp->d_name);
    if (lstat(fileName, &stat_buf)==-1){
    perror(fileName);
    exit(3);
 }
 if(strcmp(direntp->d_name,".") && strcmp(direntp->d_name,"..")){
   if (S_ISREG(stat_buf.st_mode)){
 fileList[i] = (char *) malloc(MAX_NAME_SIZE*sizeof(char));
 fileList[i] = direntp->d_name;
 stats[i] = stat_buf;
 printf("%-25s - regular\n", fileList[i]);
 i++;
   }
 }
   }
   closedir(dirp);
   return i; 
  }

Answer 1

您不能像这样比较字符串：

char * initialFileList[MAX_LIST_SIZE];
char * finalFileList[MAX_LIST_SIZE];
....
if(finalFileList[i] == initialFileList[j]){

请使用 strcmp 代替：

if(strcmp(finalFileList[i], initialFileList[j]) == 0){

只需确保所有字符串都以 null 结尾，或者使用 strncmp。

您的代码显示您创建了一个文件的原因是 finalFileList 中的任何指针都不与 initialFileList 中的任何指针匹配。

Answer 2

您没有正确遵循上一个答案中的建议。你这样做了：

<代码>
if(strcmp(finalFileList[i],initialFileList[j]))

而不是这个：


if(strcmp(finalFileList[i],initialFileList[j]) == 0)


请仔细阅读 strcmp() 的文档。如果两个字符串匹配，则返回零，而不是 1。