reading a file in a subdirectory

Question

I'm given a path to directory with mutiple subdirectories. Every subdirectory has a file with name "st". I'm trying to read every st file from every subdirectory but I always receive a NULL pointer when calling fopen ???

My code:

int main(){

DIR *dir;
struct dirent *ent;
FILE *st;

dir=opendir("/home/me/Desktop/dir/");

while( (ent=readdir(dir)) != NULL ){

    if(ent->d_type == DT_DIR && strcmp(ent->d_name, ".") != 0  && strcmp(ent->d_name, "..") != 0 ){

        DIR *subDir = opendir(ent->d_name);

        st = fopen("st", "r");

        if(st == NULL){
            perror("doesn't exist");

        } 

    }

}
closedir(dir);

}    

Answer 1

The problem is that the name in end->d_name is just the name of the "file" inside the directory, it's not the complete path, which means your call to

DIR *subDir = opendir(ent->d_name);

tries to find the directory in the process current directory.

You need to take the path you passed in to the first opendir call and append the new path part.