APUE-1

 

#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
    DIR *dp;
    struct dirent *dirp;

    if (argc != 2) {
        printf("usage: ls directory_name");
    }
r(dp);
    exit(0);
}
    if ((dp = opendir(argv[1])) == NULL) {
        printf("can't open %s\n", argv[1]);
        exit(1);
    }

    while ((dirp = readdir(dp)) != NULL) {
        printf("%s\n", dirp->d_name);
    }

    closedir(dp);
    exit(0);r(dp);
    exit(0);
}
}