stat_st_mode.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main(void){
    struct stat sb;
    stat("/tmp", &sb);
    switch (sb.st_mode & S_IFMT) {  /* &  binary AND */
        case S_IFBLK:
            printf("block device node\n");break;
        case S_IFCHR:
            printf("character device node\n");break;
        case S_IFDIR:
            printf("directory\n");break;
        case S_IFIFO:
            printf("FIFO\n");break;
        case S_IFLNK:
            printf("symbolic link\n");break;
        case S_IFREG:
            printf("regular file\n");break;
        case S_IFSOCK:
            printf("socket\n");break;
        default:
            printf("unknown\n");
            break;
    }
    return 0;
}