Recursively look for a file in all subdirectories on Linux

Question

I am trying to find the file specified as a parameter through all the subdirectories. The problem with my code is that when it gets to a file that is not a directory, it stops with perror("Error opening the directory\n");.

I cannot find a way to overcome this. I tried with another if(S_ISREG...), but it does not work.

include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>

void check_file_existence(char *dirName,char *file){
    struct stat *metadata;
    char name[1000];
    struct dirent *dirEntry;
    struct stat bufstat;

    DIR *dir;

    dir = opendir(dirName);
    if (dir==NULL)
    {
        perror("Error opening the directory\n");
        exit(1);
    }

    while ((dirEntry = readdir(dir))!=NULL){
        lstat(dirEntry->d_name,&bufstat);

        if(S_ISDIR(bufstat.st_mode)){
            if (strcmp(dirEntry->d_name,".")==0 || strcmp(dirEntry->d_name,"..")==0){
                continue;
            }
            sprintf(name,"%s/%s",dirName,dirEntry->d_name);
            printf("%s\n",name);
            check_file_existence(name,file);
        }       
    }

    closedir(dir);
}

int main(int argc,char **argv){
    if (argc!=3){
        perror("Number of arguments is wrong.\n");
        exit(1);
    }

    check_file_existence(argv[1],argv[2]);  
}