[英]C: <sys/stat.h> functions S_ISLNK, S_ISDIR and S_ISREG behaving oddly?
The code this is taken from compiles fine. 从中获取的代码可以很好地进行编译。 It prints file names in a directory with the option of a letter in front of it: either a
d
, f
, l
, or o
depending on their file type ( o
for other). 它在目录中打印文件名,并在文件名前打印一个字母:
d
, f
, l
或o
取决于文件类型(其他为o
))。 However, I tested it on the directory /etc/network
which has a symbolic file called run
and it appeared as d
? 但是,我在目录
/etc/network
上对其进行了测试,该目录有一个名为run
的符号文件,显示为d
?。 I've tried re-arranging the order of the if-statements
too, but that gives an unsatisfactory output too. 我也尝试过重新安排
if-statements
的顺序,但这也给出了不令人满意的输出。 Am I using it incorrectly? 我使用不正确吗?
while ((ent = readdir (dp)) != NULL) {
lstat(ent->d_name, &st);
if (col){
if(S_ISDIR(st.st_mode)){
printf("d\t");
}
else if (S_ISREG(st.st_mode)){
printf("f\t");
}
else if (S_ISLNK(st.st_mode)){
printf("l\t");
}
else {
printf("o\t");
}
}
In this line: lstat(ent->d_name, &st);
在这一行:
lstat(ent->d_name, &st);
, dp->d_name
contains only the name of the file, you need to pass the full path of the file to lstat()
like this: ,
dp->d_name
仅包含文件名,您需要将文件的完整路径传递给lstat()
如下所示:
char full_path[512] = "DIR_PATH"; //make sure there is enough space to hold the path.
strcat(full_path, ent->d_name);
int col = lstat(full_path, &st);
BTW, S_ISDIR
, S_ISLNK
etc are POSIX macros, not functions. BTW,
S_ISDIR
, S_ISLNK
等是POSIX宏,而不是函数。
This might work as an alternative solution: 这可以作为替代解决方案:
if(col){
if(ent->d_type == DT_DIR)
printf("d ");
else if(ent->d_type == DT_LNK)
printf("l ");
else if(ent->d_type == DT_REG)
printf("f ");
}
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