UNIX文件信息

Question

我正在試圖製作一個監視一個文件夾的程序，並檢查內部的任何文件是否修改了其內容或權限。

我的代碼是在這裏：

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，此代碼不會有好的表現，但現在，我要的是爲它工作。我有一個其他的功能，獲得該文件夾內的文件名稱和統計資料，但該功能正常工作。

當我嘗試刪除一個文件夾的名稱比該文件夾中的某個其他文件（字母順序）更低時，程序告訴我已經創建了一個文件，而不是將其刪除。我懷疑這可能是一個索引問題，但我不知道它在哪裏。

在此先感謝您的幫助！

P.S.

另一個函數，即獲取文件名和統計信息。這裏有什麼不對嗎？

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

你不能比較字符串這樣的：

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

使用strcmp代替：

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

只是要確保您的所有字符串都是空終止，或使用strncmp。

你的代碼說你創建了一個文件的原因是finalFileList中的指針都不匹配initialFileList中的任何指針。

Answer 2

您沒有正確地按照上一個答案的建議。你這樣做：

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

，而不是這樣的：

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

請閱讀文檔的strcmp（小心）。如果兩個字符串匹配，則返回零，而不是1.