How can I check whether this is directory-path or any filename-path?

问题

by this

Why does fopen("any_path_name",'r') not give NULL as return?

i get to know that in linux directories and files are considered to be file. so when i give any directory-path or file-path in fopen with read mode it doesnt give NULL file descriptor and?

so how can i check that whether it is dirctory path or file-path ? if i am getting some path from command argument?

回答1:

man 2 stat:

NAME
     fstat, fstat64, lstat, lstat64, stat, stat64 -- get file status

...

     struct stat {
         dev_t           st_dev;           /* ID of device containing file */
         mode_t          st_mode;          /* Mode of file (see below) */

...

     The status information word st_mode has the following bits:

...

     #define        S_IFDIR  0040000  /* directory */

回答2:

You can use S_ISDIR macro .

回答3:

thanks zed_0xff and lgor Oks

this things can be check by this sample code

#include<stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main()
{
struct stat statbuf;

FILE *fb = fopen("/home/jeegar/","r");
if(fb==NULL)
    printf("its null\n");
else
    printf("not null\n");

stat("/home/jeegar/", &statbuf);

if(S_ISDIR(statbuf.st_mode))
    printf("directory\n");
else
    printf("file\n");
return 0;
}

output is

its null
directory

来源：https://stackoverflow.com/questions/8427436/how-can-i-check-whether-this-is-directory-path-or-any-filename-path

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Linux

file